practical december - American Radio History

practical december - American Radio History
PRACTICAL
WIRELESS
DECEMBER
196.6
2!6
DOUBLE -SIDED BLUEPRINT
INIERCOM
AND
BEGINNERS'
5 -BAND
RECEIVER
JACKSON
the big name in PRECISION components
SOLDERING INSTRUMENTS
AND EQUIPMENT
DESIGNED FOR
Precision built radio components are an important
contribution to the radio and communications
industry. Be sure of the best and buy Jackson
Precision Built Components.
"00" Twin Condenser
THE AMATEUR'S
RADIO STATION
ILLUSTRATED
List No. 70 g" BIT
IN
PROTECTIVE
SHIELD
List No. 68
Designed for use in miniature transistor receivers.
The front (aerial) section
is 208pF to provide coverage for medium waves,
and the rear section is
176pF, which may be
padded to match the
oscillator-very robust yet
lightweight.
Front area
18in. x 1;Zin. x lin.
deep. PRICE 12/6.
In the
"ten five" receiver used 3 gang type F price
21/3. 2 air tune 7/9 each caliband drive at 28/-.
JACKSON BROS. (LoNDoN) LTD.
(Dept. P.W.) KINGSWAY-WADDON,
CROYDON, SURREY
Phone. Croydon 2754-5
Grams. Wa/fi/co, Croydon, London
NOMBREX
INSTRUMENTATION
WIDE RANGE
TRANSISTORISED
SIGNAL GENERATOR
MODEL 27
Range 150Kc/s-350Mc/s
** Direct
Calibration
** Mod.
or Unmod. output
Accuracy better
2%
than
£10.16.9.
ALSO AVAILABLE
C. R. Bridge 62
Inductance Bridge 66
Power Supply Unit 61
..
..
..
£9.6.9
£18.6.9
£6.14.6
WIDE RANGE TRANSISTORISED
AUDIO GENERATOR 63
for catalogue apply direct to:Sales and Service Dept.
ADCOLA PRODUCTS LTD.,
ADCOLA HOUSE,
GAUDEN ROAD,
LONDON, S.W.4
Telephones
MACaulay 0291/3
Telegrams
SOLJOINT LONDON SW4
* Range 10c/s-100Kc/s
** Accuracy & Low Dist.
* Calibrated Output
Sine or Square Wave
£17.1.9
All prices include battery, post and packing
S.A.E. for
Trade & Export
Prompt
Leaflet
Enquiries Invited
Delivery
NOMBREX LTD
INSTRUMENTS
Estuary House, Camperdown Ter., Exmouth, Devon
ENORMOUS
PURCHASE
Transistorised
GUARAN-
TEED.
APPROX. HALF PRICE.
WORLD FAMOUS MAKE
*
TAPE
We oiler you fully tensilised polyester/
mylar and P.V.C. tapes of identical
quality hi-fi, wide range recording
characteristics as top grade tapes.
Quality control manufacture.
They
are truly worth a few more coppers
than acetate, sub -standard, jointed or
cheap imports.
TRY ONE AND
PROVE IT YOURSELF.
Standard Play
Triple Play
3in. 150ft. 2/3 4in.
900ft. 18/4in.
300ft. 416 5in. 1,000ft. 25/5ie.
600ft. 7/6 5;án. 2,400ft. 34/5gin. 900ft. 10/6 7in. 3,600ft. 44/ 7in. 1,200ft. 12/6
Quadruple Play
Double Play
Long Play
Sin.
300ft. 4/- 3in.
225ft. 2/9
4in.
600ft. 8/- 4in.
450ft. 5/6
Sin. 1,200ft. 15/- 5in.
900ft. 10/6
5din. 1,000ft. 19/6 5gin. 1,200ft. 18/7ín. 2,400ft. 27/- 7in. 1,80ft. 18/6
Postage 11- reel.
Poet Free less 5% on three reels.
Quantity and Trade enquiries invited.
NOTE. Large tape stocks at ail branches.
FM
Tuner
CALLERS WELCOME
Demonstration without
obligation at all
branches
15 Watt
GARRARD
KIT
14 TRANSISTOR
consisting of FMT41 tuner
and the excellent Sinclair
Z12 (built) together with
complete integrated control.
Kit consisting complete vol.
on/off, treble and base,
component sets with complete connecting instructions
and circuits, battery version
£13.19.0
or complete with AC mains
power pack 617/18/6.
STEREO VERSION with 2
Z112 amplifiers 218/10/0.
A.C. STEREO 022/10/0.
All Factory Fresh. All with cartridge.
Lyle
Ceramic Stereo cartridge filled to
SRP12
£4/7/6
28/19/0
65/10/0
26/5/0
any deck for 15/- extra.
SP25
AUTOSLIM
Model 1,000
Model 2,000
Model 3,000
HIGH QUALITY:
LOW NOISE:
BATTERY OR MAINS
OPERATION
BARGAIN PARCELS
er, more interference free reception. Months of use from a
standard 8 volt battery or its
small power requirements can be
drawn from any amplifier. Low
noise frequency changer with
smooth 2 gang tuning feeding no less
than three I.F. stages coupled to a
double -tuned discriminator terminating in
an L.F, stage giving ample output for all
quality amplifiers
824/19/0
829/19/0
B.S.R. BARGAINS
TÚ14
GÚ7
59/b5/ 89/99/65/10/0
0A14
UA16
UÁ25 SUPERSLIM
CARTRIDGES
G.C.2. Garrard Mono
EV26 Garrard Stereo Ceramic
UEPHONIC SUPER Ceramic
Stereo Diamond 1,000mV
Output
DECCA DERAM Stereo
161-
24/29/ 59/-
TRANS/CEIVERS
9/-
£6.19.0
2/6 p. at p.
These cannot be operated in the U.K.
dearer models.
STEREO FM HERE!
Value in
VALVES
GUARANTEED 3 MONTHS
BY RETURN OF POST
Satisfaction or Money Back Guarantee on goods if returned unused within 14 days.
ALL VALVES ARE NEW UNLESS OTHERWISE INFORMED.
FREE
From Denmark's Largest Radio Factory
THE NEILSEN 'ARENA' T1900H
All wave AF/FM stereo receiver amplifier, 5 wave bands 2
sinus pressure -chamber speakers, 8 watts, four channel.
Fully transistorised, natural oiled teak cabinet, internal/external speaker, A.F.C., FM & AM tuning controls, internal or
external aerials, tape recorder, gram ingots. 200/250 v. A.C.
65 Gns.
69 Gns.
MeMer
TRANSIT INSURANCE. POSTAGE 1 valve 9d., 2-11 6d. per valve. Free over 12.
2/3 6K8GT 4/3 20P4 17/8 ECC88 9/8 GZ34 10/6 SP61
1L4
2/9
1R5
4/9 61.1
9/6 25L6GT 7/- ECF80 7/9 KM 12/- TDD4
7// 6L6G
8/6 25Z4G 7/- ECF82 7/6 KT63
5/9 U14/18 7/6
155
4/6 6L18
7/9 30F5
9/- ECH21 10/- KT66 19/6 U25
9/6
1T4
3/- 6LD20 8/6 30FL1 9/9 ECH35 11/- KT88 27/5 U26
9/6
2021
5/6 6P25
12/- 30L15 11/6 ECH42 10/e KTW61 5/9 U35
12/6
3A5
8/- 6P28
9/6 30P4
11/6 ECH81 6/9 KTW63 5/- U37
11/3Q4
5/3 8Q7G
7/- 30P12
8/- ECH83 7/9 KTZ83 7/- 11107
5U4G
6/- BQ7GT 8/9 30PL1 11/- ECL80 5/9 MU14 7/- 17191 12/6
12/6
5Y3GT 6/6 6SL7GT 8/9 35A5
9/6 ECL82 7/6 N37
9/6 U281
9/8
5Z4G
6/9 6SN7GT 6/9 35L6GT 8/6 ECL83 10/6 N78
13/- U282 15/5Z4GT 9/6 8U4GT 9/6 35W4
6/6 ECL86 9/6 N108 13/- U329
8/8
6/30L2 9/6 6V13G
4/9 35Z4GT 5/9 EF36
4/9 PC86
9/6 11801 19/CABO
7/8 6V6GT 6/9 30L6GT 8/6 EF39
7/- PC97
7/6 UABC806/6
6AK5
4/9 6X4
4/6 80
7/6 EF40 10/- PCC84 2/6 UAF42 7/9
GAGS
5/- 6%5G
5/- 185BTA19/6 EF41
9/- PCC85 7/6 117341 6/8
GATO
5/- 6X5GT 6/9 807
9/6 EF50
8/8 PCC88 11/9 UBC41 8/9
6BA6
5/8 7B6
11/6 955
3/6 EFgO
4/3 PCC89 11/- UBC81 6/9
6BE6
5/6 7B7
7/8 956
3/- EF85
6/3 PCC189 9/9 UBF80 7/6
6BH6
6/6 7C5
9/6 AZ31
8/6 EF86
7/6 PCF80 6/9 UBF89 7/6
6B76
7/- 706
7/6 CBL3I 19/6 EF89
6/8 PCF82 0/9 UBL21 10/9
6BR7
9/6 7H7
7/6 DAF96 7/3 EF91
3/6 PCF88 8/3 UC92
6/9
6BW6 -7/6 737
14/6 DF96
7/3 EF183 8/- PCL82 7/9 UCC85 7/3
6BW7 5/- 774
7/- DK92
8/6 EF184 8/- PCL83 9/6 UC180 8/6
604
3/- 1001
11/- DK96
7/3 EL32
5/- PCL84 9/- UCH21 10/9
6C5
5/6 10C2
12/6 DL92
6/- EL33 12/- PCL85 9/6 UCH42 8/8
6C6
4/- 10F1
716 DL94
6/6 EL34 11/6 PCL86 9/6 UCH81 7/609
11/- 1OLD11 14/6 DL96
7/3 EL35
8/- PL33 8/6 UCL82 8/6CD6G 17/- 10P13
9/6 EABC80 6/9 EL38 15/- PL36 11/- UCL83 10/6
BDB
4/- 10P14 9/6 EAF42 Si- EL41
9/9 PL38 12/6 11E41
9/6F1
6/6 12AT7 4/9 EB41
4/6 EL42 _ 8/9 PL81
719 UF42
6/9
6F6G
5/- 12AU7 5/6 EB92
2/9 EL84
6/6 PL82
5/9 UF85
7/6
13E13
4/6 12A%7 8/- EBC33
/6 EM80
7/- PL83
6/- UF89 6/9
6214
7/6 12J7GT 9/- EBC41 9/6 EMS'
7/6 PL84
7/- UL41 10/6E15
916 12K7GT 5/- EBC91
6/9 EM84
7/9 PY81
7/6 UL44 14/6E23
8/- 12K8GT 910 EBF80 7/9 EY51
7/6 PY32
9/8 UL46 10/6
635G
4/- 12Q7GT 8/6 EBF89 7/- EYS6
7/3 PY88
7/8 U1.84
6/8
635GT 6/6 1457
14/6 EBL21 11/- EY88
PY80
8/6
5/9 UM86
9/8
616
3/3 19AQ5 5/6 ECC40 9/6 EZ40
7/6 PY81
5/9 11Y21
8/9
637G
5/6 20D1
8/9 ECC81 4/9 EZ41
8/6 PY82
5/8 17Y41
7/ MGT 9/8 20F2
9/6 ECC82 5/6 EZ80
5/6 PY88
5/9 17Y85
5/8
BR7G
2/8 20L1
16/- ECC83 6/- EZ81
6/- PY88 8/8 VR105 5/6K7GT 5/9 20P1
9/6 ECC84 7/- FC4
8/- PY800 7/- VR150 5/6K8G
5/9 2023
9/6 ECC85 5/9 GZ82
9/6 PESO
9/6 X66
7/9
-
P se'''"
£18/10/0
They
givean excellentperformancewithreliability,
long telescopic aerial, crystal controlled.
They compare with much
29/-
ARENA T1900F
eke
Arena Hi -Ft speakers stocked at all branches.
68/10/0
£8/19/0
A70
LAB80
401
The very latest Silver/Black finish.
17/6
operation tuning indicator base, treble volume
controls. Size 29#in. x 5On. x Olin.
Or complete with Stereo Multiplier, as stocked
in all branches.
£6110/0
AT60
This beautifully compact
6 transistor machine (size
6 x 4 x 25in.) will give quiet-
Including variable condensers, i.f. coils, loudspeaker plugs/sockets,knobs,pots, condensers,
resistors, nuts, bolts, cabinet fittings, switches
transformer choke, rectifier, transistors at a
small fraction of list value. Due to heavy
demand we are now packing them in several
sizes-TRY ONE.
8 lbs. (post 3/-)
lbs. (post 5/-)
1411m. (post 6/-)
LATEST
TUNER AMPLIFIER
59 Gns.
CALLERS. Wide range of Hi-Fi equipment available st all
branches. WE OFFER PACKAGE DEAL DISCOUNTS.
recel°era. Due
AM/FM 9 TRANSISTOR Portable
to enormous purchase
we can offer these black/satin chrome receiversnormahy approx.
12 gas. covering full medium wave and F.M.
bands. Built-in aerials, medium size, with batt. 912 Gns.
ALL BRANCHES hove a wide range of transistor sets from 551 to £70.
HITACHI PORTABLE
TAPE RECORDER
Latest Hitachi. Fabulous quality and reproduction of
music. 6 transistor. 11in. and 31in. speeds. Output
500 mW. into high quality speaker. Ingenious single
control knob. Fast forward and rewind. Battery level
and record level meter. Fast load. Precision capstan
drive with dynamic earpiece monitor recording. Radio
recording leads. Outside speaker facilities. The most
outstanding portable in the country. Size 8s/,,ex 3g x 61in.
Genuinenormalprice of 35 gas. Unrepeatable. 12 months'
guarantee. All spares available. With
1.9 Gns.
tape, tape reel, mike, etc.
PLEASE NOTE. A wide range of mains and battery tape
recorders from £4 to £100 demonstrated at all branches.
100 HI-STABS
9/6
100 RESISTORS
6/6
1% to5% 1000 toy m0.
CO-AX, low loss, Od. yd. 25 yds.11/6;
50 yds. 22/-; 100 yds. 42/6. Plugs 1/8.
SIZES
5--3 watt.
MICROPHONE
CABLE.
Highest
quality black, grey, white, 9d. per
yard.
100 CONDENSERS
9/6
Miniature Ceramic, Silver, Mina, etc.
3pF to 5µF. LIST VALUE OVER £4.
25 ELECTROLYTICS
Assorted 2 to 500 mid 6 to 400
volt. LIST VALUE OVER £5.
9/6
50 TAG STRIPS
7/6
Mixed sizes
2
to 15 way.
25 POTENTIOMETERS
Including with switch, long
and short spindle, pre-sets, log 9/6
and lin, unused, 1k -2m 0. LIST
VALUE APPROX. E4.
CONNECTING WIRE
4/.
P.V.O. Bright Colours. Five
25ft. coils only.
CALLERS.
A very wide range of
electronic components swell you at all
branches. Your enquiries welcomed.
CAR RADIOS
Latest Autolux fully transistorised
complete with speaker and fittings.
Large purchase enables us to sell
these superb sets (normally approx.
14 gns.) at the amazing g
Gns.
price of
PLEASE NOTE. A range of keenly
priced car radios for your inspection
at ail branches.
Stockiste of Leak, Quad, Chapman, Goodman, Armstrong, Tripletone, Linear, Rogers, Truvox, Ferrograph, Wharfedale, etc.
Post: 11b. 1/5, 15 lb. 2/6, 2 lb. 2/9, 4 lb. 3/8, 61b. 4/-, 14 lb. 5/6.
All Mail Orders to Brighton please
TECHNICAL
TRADING
LONDON enehuamm 263gí Road
BRIGHTON Tel.8 0722ní Place
PORTSMOUTH TO-S524a"on
SOUTHAMPTON T2EastStreet
WORTHING Tei League Street
545
BRAND NEW AM/FM (V.H.F.) RADIOGRAM CHASSIS
AT £15.15.0 (Carriage Paid)
7he
SUPER 6
LONG
O.
MEDIUM WAVE
TRANSISTOR RADIO
A quality radio available as a kit or ready-built. The sparkling performance and
superb finish of the completed receiver give you value equivalent to a £21.12.0
commercial model.
Superhet circuit
350mW output.
6 transistors and diode.
All new parts.
en.
high. New manufacture. Dial 147 x 4in. in 2 colours,
Chassis size 15 x 67 x
predominantly cream. 200-250v. A.C. only.
Pick-up Ext. Speaker. Ae., E. and Dipole Sockets. Five push-buttons-LW, MW,
SW, FM and Gram. Aligned and tested. O.P. Transformer Tone control 1000-1900K;
200-550M; 88-98 Mc/s. 6-17 me/s. EZ80 rect.; ECH81, EF89, EABC80, EL84, ECC85,
3 -ohm speaker required.
9 x 6in. ELLIPTICAL SPEAKER, 20/- to purchasers of this chassis.
TERMS: (Chassis). £5.5.0 down and 5 monthly payments of £2.5.0. Total H.P.
price, £16.10.0. Cheap Room Dipole for V.H.F., 12/6. Feeder 6d. per yard. Circuit
diagram, 2/6. Carriage to N. Ireland, 20j- extra.
NEW 6 PIISH-BIITTON STEREOGRAM CHASSIS. M.W.; S.W.1; S.W.2;
Gram; Stereo Gram. Two separate channels for Stereogram with balance control.
Also operates with two speakers on Radio. Chassis size: 15 x 7 x 67in. high. Dial
cream and red. 15 x 3in. 190-050M; 18-51M; 60-187M; VHF 86.100 m/cs. Valves:
ECC85, ECH81, EF89, 2 x ECL86, EM84 and Rect. Price £19.19.0, cam. paid
or £6.13.0 deposit and 5 monthly payments of 56/6. Total H.P. price 220.15.6.
Cream moulded escutcheon included.
-
TAPE AMPLIFIER FOR MAGNAVOX
2 or 4 TRACK (4 TRACK 25/- EXTRA)
TAPE DECKS
Chassis 127 x 57 x 4--in. high. Plastic front panel" gold "finish -127 x 411in. 200-250
A.C. Record/Playback amp. switch; Off/On-Tone; Vol/Mit; Vol/Gram; Mie. Input;
Gram. Input; Monitor; Speaker Sockets. Valves 6BR7; 12A%7; EM84; EL84; 6X4
Separate power pack. Complete amp. and power pack, 010.17.6. (6/- P. St P.). Rexine
covered cabinet (tan) 157 x 17 x 97in. high with sloping front for amp; complete
with two tweeter speakers, and special adapting brackets for Magnavox Deck85/- (8/- Carr.) 3 speed Magnavox 2 track tape deck £10.17.6; 4 -track 212.15.0.
Complete Recorders (with speed compensation) 2-track £29; 4 -track £32 (carr. 25/-).
Worth £10 more on normal retail prices.
THE
Radio Constructor
BUILD THE "CONWAY"
4 BAND SUPERHET
1875 Mc/s to 150 Kc/s
*
*
*
*
*
Ferrite rod aerial. * Weymouth Radio printed circuit board. * Component
positions and references printed on back of board. * Nicely styled wooden cabinet
11 x 77 x 37ín. * Vinyl covered in various colours. * 6 x 4in. speaker giving good
Full instruction booklet, 21-. Free with kit. * I.f.
bass and treble response.
frequency 470 ke/s. * Lining up service if required. * All parts supplied separately.
Write for list, S.A.E. COMPLETE KIT ONLY
£4.0.0U P. & P. 5/OR FULLY BUILT £6.7.6. Tan and Corr. Paid.
*
TRANSISTORS AND DIODES
0026, 7/6; 0044, 3/6; 0045, 3/6; 0071, 3/-; 0072, 4/-; 0081, 3/6; 0081D, 3/6;
0082, 6/-; 0083, 3/6; 00169, 8/-; 00170, 7/-; 0C171, 8/-; 00172, 8/6; AC127, 7/6;
AF115, 8/6; AF116, 8/-; AF117, 5/-; AF118, 7/6; AF119, 7/6; WG4B, 9d.; OA81, 2/6;
0A79, 2/6; 0A85, 2/6; BY100, 4/-. Poal 4d. any quantity.
STEREO -AMPLIFIER 2 x 4 WATT
Valves 50083, 2 x EL84, on printed circuit approx. 4 x 4in. Neg. feed back. Controls
(vol. or tone) on separate panel, 67 x 2in. Separate power pack with rect., double
wound maim trans., connection socket etc. Supplied fully wired and tested with two
O.P. transformers for 3 -ohm speakers, only £4.15.0 (7/6 P. t P.). Two speakers, 8in.,
3 -ohm for 20/- each, post paid, if ordered with above Amp.
BATTERY ELIMINATOR. 57 x 47- x 21in. for 90 v. H.T. at 20mA and 1.5 v. at up
to 250mA. Fully built, 551- carriage paid.
GLADSTONE RADIO
(2 mins. from
66 ELMS ROAD, ALDERSHOT, Hants.
Aldershot 22240
Station and Buses)
CLOSED WEDNESDAY AFTERNOON
CATALOGUE 6d.
Bulk enquiries invited for Export.
For quick, easy faultless soldering
-EiiSN
°®
CORE
IxOLD
Easy to use and economical. Containing 5
cores of non -corrosive flux, instantly
cleaning heavily oxidised surfaces. No extra
flux required. Ersin Multicore Savbit Alloy
reduces wear of copper soldering iron bits.
SIZE 5
HANDY SOLDER
many other constructional articles
NOVEMBER ISSUE
ON SALE NOW 2/6
or 3s. post paid from:
DATA PUBLICATIONS LTD
57 MAIDA VALE, LONDON W.9.
THE
546
Radio Constructor
DISPENSER
Contains 12 ft. of
coil 18 s.w.g.
Ersin Multicore
Savbit Alloy. Quick
and easy to use.
NEW SIZE 15
21 ft coil of 60/40
Alloy, 22 s.w.g. in
dispenser. Ideal
for small components,transistors,
diodes, etc.
a
3/- each
2/6 each
SIZE 12
Ideal for home
constructors.
Contains 102 ft.
of 18 s.w.g. Ersin
Multicore Savbit
Alloy on a plastic
reel.
15/- each
(Also available
in other sizes)
BIB MODEL 3
WIRE STRIPPER
AND CUTTER
Strips insulation
without nicking
the wire, cuts
wire and splits
plastic twin flex.
4/- each
From Electrical or Hardware shops. If unobtainable write to:
MULTICORE SOLDERS LTD., Hemel Hempstead, Herts.
m29
The revolutionary JOYSTICK AERIAL SYSTEMS presents a
satisfactory solution to all the problems of restricted space receiving (and
transmitting) aerials. A completely new range of tuning units have been
designed to allow the maximum possible efficiency with absolute simplicity
of tuning and operation. For reception on all amateur bands from 1.8 Mc/s
to 30 Mc/s, for general short wave and broadcast reception including the
medium wave band. This variable frequency aerial system has been acknowledged as the most successful solution to a host of aerial problems. Over
5,500 are in use all over the world (as at July 1966). Hundreds and hundreds
of terrific testimonials may be seen at the Joystick Office-the selection
shown here will prove the point.
OUTSTANDING SIGNALS FROM THE JOYSTICK VFA
CAN BE HEARD EVERY DAY ON THE AMATEUR AND
MARINE BANDS. START THE SEASON WITH A SUPER
AERIAL.
James C.
Cox-Hull "I find it successful in all ways
an avid SWL."
...
...
John Cramb-Eastbourne
Above: One of the new
JOY MATCH `EASY -TO-USE'
units with built-in RF indicator
"Have indoor Joystick
am
getting excellent results on my Codar CR45."
B.B. St. V. Moullin-Guernsey "Truly satisfied
GC1U Mohican Rx performs with greater selectivity."
Raymond F. Bence-Cardiff "Joystick system certainly
does its stuff."
G. W. Smith 8 Co. (Radio) Ltd., 3 Lisle Street, London, W.C.2; Brian J. Ayres
8 Hartfield Road, Wimbledon, London, S.W.19; Stephens -James Ltd., 70 Priory
UK AGENTS:
Road, Liverpool, 4; Chas. H. Young Ltd., 170/172 Corporation Street,
Birmingham, 4; R.S.C. (Manchester) Ltd., 326 Argyle Street, Glasgow,
or ask your local dealer.
France: Vareduc-Çomimex, 2 Rue Joseph -Riviere, Paris.
Courbevoie, France.
West Germany: Ing. Hannes Bauer, 86 Bamberg, Hornthalstrasse 8,
West Germany: Dressing GmbH, 45 Osnabruck, Bohmter Str, 32,
West Germany; Stotz ft Goessl. 8 Munchen 15, Bayerstrasse 3,
AND WORLD WIDE AGENCIES
III
®
®
II II
IIII
II
IN
II
WI
II In
THIS BROCHURE GIVES YOU THE FACTS
AND ONLY THE FACTS!
PARTRIDGE ELECTRONICS LTD.
CAISTER HOUSE, PROSPECT ROAD, BROADSTAIRS,
NAME
KENT
CALL/BRS No
ADDRESS
12
®
Er
Co.,
Cl;
El
sE1
SEND TODAY
®
... am
R.S.T.
VALVE MAIL ORDER CO.
144-146 WELLFIELD ROAD, STREATHAM, S.W.16
0A2
5/3
6BE6
1A7
7/9
613116
013.10
5/-
003
3/3
2/6
6C5G
1LD5
1N5GT
1115
36
3A4
606
5846
4/9
5/9
8/9
3V4
bR4G
5U4G
6A7
6A8G
6AC7
60W4 1216D6
2/9
6E5
5/9
9/6F1
6P5G
5/-
4/8/5/8/-
5V4G
5Y3GT
6F6G
6F8G
6F8G
6F11
6F13
6E14
6F23
9/9
15/-
12/6
314/8
BAKS
3/-
6AL5
6G6
2/6
3/3
6A315
6AM6
4/3/9
6/-
6C8G
6CD6G 22/8
60116
5/9
6¡6
3Q4
524
6/30L2
7/7/7/-
6BQ7A
6BR7 10/6
7/6
6B558
16/9
6B87
7/6
6BW6
8/6
6BW7
6C4
1/9
6/7/6
5/8/5/5/-
1135
1115
164
165
1T4
4/6
6AQ5
5/6
6A87G 19/6
6AT6
3/9
6AÚ6
6/6B8G
2/6B4G 10/6BA6
4/6
4/-
4/6
4/6
12/6
5/-
12/6
10/216
6116
1/3
6352.1
616
6J5G
6J5GT
646
63731
6J7G
6J7GT
2/8
4/6
318/6
4/3
816
19/6
6K6GT 51- 7557
17/9
61L73/1
51- 787
7/6
6K7G
1/3 71/4
8/6K7GT 4/6 9BW6
9/1001
6K8M 8/6
6K8G
3/- 1002 12/BK8GT 813 1001 12/6
6E25 20/- 10E3 12/6L1
9/6 10x9
9/9
7/- 10F18 9/6L6G
6L18
6Q7G
6Q7GT
60,17
7/6
5/6
10151
6807
71-
6/6
12A55ß
9/4/-
68G7
2/8
68117
68J7
5/68K7GT 4/9
68L7GT 4/9
66N7GT 4/6807
6/6U4GT 10/6475G
7/6
6V6M
6V6G
6V6GT
8/3/6
7/-
10/-
101.011 10/10P13 12/6
15/12ÁT6 4/6
12AT7 3/3
12AÚ6 5/9
12AÚ7 419
12AX7 5/9
12BA6 6/12BE6 5/3
12C8GT 7/6
12E1
19/8
12J5GT 2/3
12J7GT 7/3
12K7GT 3/12K8GT 8/12Q7GT 3/120A7 8/6
I9AQ5
20D1
20E2
20L1
20P4
20P5
7/6
10/11/-
13/12/6
50L6GT 6/-
DF96
5/- DH77
4/6 DK32
5/- DK91
75
78
80
8/6
85A2
12/- 150B2 14/6
DK92
15K96
6/- ECF80
6/6
E01121
EC1135
6/8
E01181 5/3
EC5583 7/-
15004
801
30PL1412/- CBL31 15/- EBF80
35A5
17/- CK502 5/- EBF83
12/6 E131'89
35L6
5/9 0133
35W4
4/6 CY31 10/- EBl.l
3523
10/- DAC32 7/6 EBL21
6X4
8/6
6XSG
4/9
6X5GT 7/6
11/- 12ßG7 3/6
7B6
7B7
7/- 128557 219
705
10/- 12837 3/9
706
6/- 128K7 2/9
7D5
8/- 128157 5/20/7E17
51- 1287
35Z4GT 3/9
3525
5/6
37
51-
DAF91
3/3
DCC90
8/8/-
DAF96 8/-
4/6 13E33
50B5
6/6 DF70
5005
5/9 DF91
50CD6G32/6 DF92
42
SPECIAL 24 HOUR SERVICE
OBSOLETE TYPES A SPECIALITY
QUOTATIONS FOR ANY VALVE NOT LISTED
C.W.O. No C.O.D.
Postage 6d. per Valve
5/2/6
2/6
716/6
17/6
10/6
EBL31 27/6
ECC81 3/9
ECC82 4/9
ECC83 5/9
ECC84 5/6
5/ EMS 7/-
50085
Manufacturers and Export Inquiries Welcome
PLEASE
6/6
Special 24 Hour
Express Mail
Order Service
Send S.A.E. for list
OUR
NOTE
E01'82
7/9
EM81
ECL80 6/8
ECL82 6/6
ECL83 9/ECL86 8/9
EF9
20/-
5E36
EF37A
EF39
EF41
EF50
EF80
5E85
3/7/6
EZ35
EZ40
EZ41
EZ80
EZ81
G230
GZ32
GZ34
KT36
Mon.-Sat. 9 a.m.
-5.45 p.m.
valves
No Early
Open
brand new
and boxed
71-
71- E3084
7/19/- E8U15027/6
11/- EY51
7/5/8/- ECH42 9/- EY86 6/6
3/6
7/12/6« DL70
5/- DL92 4/9
25L6GT -4(6
3/6
25Y5
7/9 DL93
6/- 807
DL94
80/5/9
2524
813
6/3
6/8
2525
7/- 866
10/- DL95
6/4/- DL96
25Z6
11/- 954
28D7
5/- DM70 515/- 1625
6/6
3001
6/6 4025A1515/- 10Y86
7/9
10/6 DY87
30015
9/9 5763
1/6 E88CC 12/30017 12/- 7193
2/2/6 EA50
30E5
10/- 7475
30FL1 10/6 ATP4 1/9 EABC80 5/9
71- EAF42 7/6
30L15 11/- ATP5
4/6 EB41
4/8
30L17 11/- ATP7
9/- AIM 30/- EB91 3/30P12
6/- EBC33 6/30P19 14/- A175
30PL1 11/- A21
8/9 EBC41 8/3
7/9 EBC90 3/9
.30PL1312/- AZ31
25_46
71-
All
4/9
7/-
8/5/5/8/6
9/6
10/-
22/6
PCF82 6/PCF84 $/PCF86 8/PCF801 9/9
PCF802 9/9
PCF80510/9
P01180612/1101180811/6
PCL82 71-
8/6
7/3
8/6
8/6
6/- KT61 17/8
20/8/6 KT66 20/2/- KT81 10/- PENB420/5/-
8/8
EF86
8/3
EF89
5/6
EF91
3/3
EF92
2/6
EF98
9/EF183 8/8
EF184 6/6
EL32
3/EL33 17/8
EL34
9/6
EL41
8/6
EL42
7/6
EL84
4/6
EL90
5/6
EL95
8/EM34 12/6
EM80
7/-
KT88 27/6
KTW61 413
KTZ41 8/ML4
ML6
17/6
12/6
M8P4 12/6
311114
31X40
N37
N78
N108
NGT1
NGT7
OZ4
PC86
PC88
PC97
PCC84
PC089
4/-
12/6
10/15/15/-
3/4/9/9/-
25/7/6
5/6
10/-
PEN45 6/PEN46 2/9
PL36
9/PL81
6/6
PL82
6/6
PL83
8/PL84
6/6
PL500 14/6
PX4 18/8
PY33
8/6
PY81
8/PY82
5/6
PY83
6/PY800 7/PY801 7/142
1819
to
Callers
Tel. STR 0199,1649
PCC18910/PCF80 616
PCL83
PCL84
PCL85
PCL86
PENA4
Closing
Daily
4/-
7/-
RG5/500
591-
8130
8P4
01'41
SP61
91725
12/6
9/1/6
1/-
19/6
SU215012/8
T41
TDD4
T710
U14
1119
1725
1126
1178
17191
17251
11301
17403
11801
9/7/7/7/-
30/9/6
8/6
3/8
11/11/6
12/-
11M80
11116
UU7
17579
17Y21
UY41
7/-
13/6
13/6
8/7/6
6/3
11Y85
5/11551141117f1111411
2716
VR105/30
51V11,150/30
VT25 29/-
VT31 59/VU111 6/VU120 12/6
6/6
16/6
UABC80 5/6
11AF42 8/9
UBC41 8/0E081 7/6
UBF80 5/9
VU508 30/-
11CC84
3EG1
40/-
5011
30/-
UBF89
170085
UCF80
6/6
8/6
6/6
8/8
1101142 8/6
UCH81 8/3
UCL82 7/6
UCL83 8/9
L1F41
11E89
171.41
UL84
8/6/819
6/-
W8131
51-
41/5/XP1-5 5/X8G1-510(X79
X111-5
Y63
Tubes
3FP7
7/6
12/6
CV1526 401-
ACR13
£3.0.0
VRC97 35/VRC517B
301-
VR05170
301 -
SETS OF VALVES
Set of 4, 24/6
DAF96, DF96, DK96, DL96
AC127
AF114
AF115
ÁF116
ÁF117
8/-
BRAND NEW TRANSISTORS
OC25
0028
0035
7/- 0044
5/- 0045
7/7/-
11/16/9/6
4/6
3/6
0071
0072
0075
0076
0077
4/6
6/6/6/-
8/ -
0081
4/OC81m/pr
0081D
0080
()MD 6/-
12/6
0083
00170
8/-
6/-
00200
8/-
4/- 00171
7/6
7(-
NEW ADDRESS
TWO -YEAR GUARANTEED TUBES
100 % REGUNNED
i..
14 ill.
Add 10/- or old tube.
59/6
Carr. 10/6.
17 in. 79/6
in.
21
99/6
and all
Slimline
Any holes in
Ex -Maintenance
-
Tested Tubes
17" 35/- 14" 15/-
Most makes and
Types (Not Slimline) Carr. 5/ -
Tubes
TWO -YEAR' GUARANTEE
EX -RENTAL TELEVISIONS
17 in.
-£1110.0
12 months' 3 star Guarantee
*Tube *Valves *Components
,,
á1,i
your knowledge of
TRANSISTORS?
Whatever your interest in transistor
circuitry, you will find the Mullard "Reference
Manual of Transistor Circuits" a valuable
source of reference.
i.
`'
FREE ILLUSTRATED LIST
The manual describes more than sixty
domestic and industrial
,,
circuits for both
applications.
Channels for all areas
Demonstrations daily from Large
Selection.
Personal collection or Insured
Carr. 17in. 30/ -
=
REFERENCE MANUAL OF TRANSISTOR CIRCUITS
U.K. PRICE 12rS Post extra 1 r-
LATEST RADIOGRAM CABINETS £9.10.0
qtS
ç'*;
'
Brand new long low design ín veneered English
walnut, dia. 40 x 16 x 151 in. Carr. 30/-. Also
Small Cabinets £6.19.6. Radiogram/Cock-
tail Cabinets (Personal Shoppers.)
".r1*1
,,p.Press button
1
`, ../
es
`' /.8Ihi
A
Free List.
TV Turret
Tuners, 2/8. New less valves. Slim models, 5/-.
models, 19/6. P & P. 2/6.
VALVES, £1 per 100. Assorted TV and Radio.
Surpina
-rental
8end for lint.
RECORD PLAYER
dismantled
receivers.
Post
4/6.
CABINETS, 49/6. Latest designed
any modern Autochanger.
TRANSISTOR CASES 19/6 90" 0 64' x 3a" P. & P. 2/6.
covered
DUKE
Et
cabinets.
CO. (LONDON) LTD.
621/3 Romford Road, E.12
548
Takes
ILF 6001-2-3
r"-Th
IMultardl Get your copies from your radio dealer, or send
remittance with order to:
MULLARD LTD MULLARD HOUSETORRINGTON PLACE. LONDON WCl
JU
AR - QUALITY
ANOTHER CODAR TRIUMPH!
1168 CR.70A COMMUNICATION RECEIVER.
This completely new receiver sets a newp high standard for
and is a worthy
additionadto thceeoutsstdanding range oledfCODARCe,
gquatity communication equipment. Frequency range: 560 Ke/s-30 Mc/s (540-10
metres) in four ranges; 660 Xis/s-1.5 Mo/s; 1.5 Mo/s-4.2 Mo/s
4.2 Mc/s-11.5 Mc/e; 11.6 Me/s-30 Mcls. Slide rule scales for each
band calibrated in frequencies plus en additional logging
scale in degrees. Two speed vernier tuning control with reverse
slow tune action. Unique aerial input stage exclusive to the
CR.70A employing High 'Q' Air-spaced CODAR-COIL Inductor
giving extremely high gain with low noise level. Panel aerial
trimmer for peaking weak signals. Double tuned I.F. Iron
cored transformers, 470 Hots with EF183 frame grid valve for
maximum gain and selectivity. 5 valves (including two twin
triodes) giving 7 valve line-up. Separate B.F.O. stage for CW and
SSB reception. Calibrated signal strength 'S' meter, illuminated. Automatic Volume control. Panel phone jack for 'private'
listening. 2.3 ohm output for external speaker. (Matching unit
optional extra.) Superb styling, metal cabinet in the new
Organasol Satin lustre finish. Size: 13' x 53' x 75'. For A.C.
200/250v- Ready built. Not a Kit at the fantastic low price of
£10.10.0. Carr. 7/6.
CODAR R.F. PRE -SELECTOR -MODEL P.16.30. Considerably improves the performance of any superhet receiver over
1.6-30 Mc/s. Uses EF183 Frame Grid Valve, and provides up to
20dB gain plus substantial image rejection. improved signal/
noise ratio and selectivity. Selector switch for either dipole or
single wire antenna. Power requirements 180-250 volts 12mA
H.T.6.3 volts, .3 amp L.T. Size 81 x 5x 4in. Ready built, complete
with cables, plugs and instructions, £5.10.0. Carr. 4/6. MODEL
P.R.30X. Self powered model for 200-250v. A.C. Also provides
25mA at 200v. H.T. and 6.3v. 1 amp L.T. for other accessories
THE NEW
£7.4.0. Carr. 4/6.
CODAR "Q" MULTIPLIER MODEL R.Q.10. For use with
any superhet receiver with an I.F. between 450 and 470 Ho/s.
Provides considerable increase in selectivity for either peaking
or rejecting a signal on AM, CW or SSB, BFO. Size 81 x 5 x 4in.
Power requirements 180-250v. l T. at 5mA 6.3v. .3 amp L.T.
Ready built complete with cables, plugs and instructions.
£6.15.0. Carr. 4/6. MODEL R.Q.10X. Self powered version for
200-250v. A.C. and also provides 25mA at 200v. H.T. and 8.3v. 1
amp. L.T. for other accessories £8.8.0. Carriage 4/6.
CODAR A.T.5, 12 WATT 2 BAND TRANSMITTER. The
newest most compact transmitter for fixed or mobile use on
160-80 metres. "The tiny TX with the BIG voice". Size only
83 x 5 x 4in. (Base area is less than two-thirds of this page!)
High stability new type calibrated VFO. 1.8-2.0 MoIs and 3.5-3.8
Mc/s (up to 4 Mo/s export). Air -spaced CODAR COIL Pi-net
output, P.A. Plate current meter plus neon Indicator. Plate Screen modulator. AM/CW switch and Panel key lack. Plug
change over for 6 or 12 volts heater supply. Ready built £16.10.0.
Carr. 4/6. A.T.5 POWER SUPPLY UNITS. For 200-250v. A.C.
and 12v. Solid state for Mobile use, complete with all Transmit/
Receive changeover switching available.
CODAR-KIT CR.45K MAINS T.R.F. SHORT-WAVE RECEIVER. World wide reception-North and South America,
Russia, India, Australia, Far East, Amateurs, Shipping, etc.
3 slow motion vernier
bandspread.
*Separate.
polystyrene plug-in coils, factory aligned
ow
*
Dials calibrated in frequencies and degrees. *Power output
3 watts for 2/3 ohm speaker. * Valve line-up: E0081, ELM,
EZ80. Size 12 x53 x Tin. CODAR-KIT CR.45K complete with
valves, 3 coils (10.28, 25-75,60-176 metres) and 11 page instruction
manual. £5.10.0. Carr. 6/-. Extra coils 5/- each. Instruction
manual only 4/- (credited on order). (Can also be supplied ready
built-price on request).
FAMOUS SHORTCODAR-KIT MINI-CLIPPER --OUR
WAVE RECEIVER * Can be built in one evening ready to
your fingertips at very low
switch on and bring the World to valve,
26-75 metres
cost. * Supplied complete withPRICE one coil
39/6. Carr. 3/-. Extra
and 4-page instruction manual.
coils 51- each. Instruction manual only 2/- (credited on order).
Electrical bandspread available. Provision to add 2 transistor
amplifier.
loss*
ddriilectrical
Send 6d. in stamps for illustrated leaflets of the Codar range
ff.P. terms available
World -Wide Mail Order Service
CHAR RADIO COMPANY
BANK HOUSE, SOUTHWICK SQUARE
SOUTHWICK, SUSSEX.
G3IRE
Tel. 3149
G3HGQ
Canada: Codar Radio of Canada, Tweed, Ontario
549
i
SENSATIONAL SELECTION OF BARGAINS
HIGH POWERED TRIPOD TELESCOPE
6
A,
'
45/-
ONLY
NO MORE TO PAY
Advantageous Purchase Direct from
Importer. 750 only at fraction of the
A.1 De Luxe
true value- Specia
model-passed by Japanese Board
of Inspection. All Metal construction
'
Black Crackle finish with plated
parts and simulated leather covering.
r+/
-
price'
r
at a
lower than
ordinarylgrade
-,-
Manufacturer at
fraction of original
price. 500 only at
Try matching this
models.
TELESCOPE
54/6
YOURS FOR
Special polished optical lens gives
NO MORE TO
PAY
Limited. number only available at this price. Japanese
astounding magnification power of
high grade optical lenses give staggering magnification of
900-1 areas. Single draw focusing tube enables you to
624 areas! simply focus on the object you wish to view
study the MOON, PLANETS & STARS. Independent
(moon, stars, boats, horses, etc.) turn the ZOOM CONview finder permits
per
you to focus on subjects miles awayTROL and see the object
shoot
you. Strong
j
just across the road. Brand new complete h
metal construction. Gives hours of
enjoyment to
Bible tripod at unbelievable price of only 451- plus 5/ -poet
all-A REALLY WONDERFUL BARGAIN.-Send
and SAFE PACKING. Satisfaction or your money back.
only 54/6 plus 4/6 p. & p. for 7 days' home trial. Money
Profit from the credit squeeze
stock bought at miles
below actual value
WIDE RANGE HIGH POWER
MICROSCOPE only 37/6
Importers
'
.-
f
& safe packing. Money back guarantee. Demonstrations
daily.
/mot
\
\
it-
Price barrier
'-
by this
purchase
New 35 mm-
smashed
amazing
I
IIIIII
THE LATEST
ALPHA HIGH POWERED
SECRET AGENT CIGAR CASE
ONLY
BINOCULARS
to pay
396
11I
9I
LENS, Sturdy, reliable. So simple even a child can use
plugs into standard mains. BRAND NEW complete with
cable, lamp, etc. Offered at fraction of real worth at 45/ -plus
5/-. P. it P. Satisfaction or money back-
reduced price.
Not repeatable at our price. /IOW ONLY
ONLY
II
made scientific instrument WITH REAL GLASS REFLEX
Scoop Purchase by
our Overseas Agent.
Exact source cannot be disclosed
J
34/6
No more
Automatic Light
SLIDE VIEWER
our knowledge the
lowest price ever.
This is really a remarkable
To
la
'Gold
` e
___---
NEW DOUBLE LENS
REFLEX CAMERA
n1lI fiCLIla21
3/6
ONLYPlus
19/a
ß:2e
3
III
P. Er P.
t
You'll never get another bargain
f
like this! Advantageous purchase
toffered
from distressed importer
p
at fraction of
/
able once this batch sold. Full size
double lens reflex camera that even
a child can use. Takes 12 full size
--127 pictures in Full colour or
black/white. You'll marvel at your
professional pictures. Beautifully made and finished, sizb
4Iin. high (6in. high with focusing hood raised) x 2in.
x Skin. Speeds 1/30th sec. F8. Should last a lifetime.
Brand new in makers' cartons our give-away price
19/6 + 3/6 P. & P.
.
Q
I
Tit
1
/
7 ,19,6 sell at
£7.19.6
intended
to
%6gns.
Pounds-cheek prices Zncaby.
Sour setti Highlyacclaimed
by
internationally acclaimed
Manufacturer (whose name we've
promised not to mention due to
unprecedented price slashing).
sa
25 jewelled LEVER movement
don't confuse with inferior pin pallet movements.
Ten micron GOLD PLATED CASE. Automatic
self-winding. Automatic calendar. GENUINE INCABLOC. Unbreakable mainspring. Waterproof S'steel back.
Chronometer mathematical accuracy. DON'T HESITATE
at our once sold never repeatable price 67.19.6 inc. 6
months guarantee + 4/6. P. & P. + Insurance. (22et
gold plated bracelet 15/- ex.) ORDER WITH
CONFIDENCE -YOUR MONEY REFUNDED IF NOT
100% DELIGHTED.
`- l
l
8rf,
fI
ttë
i
f
Interf
freeane
tone, highy
high sensitivity,
dozens yf t
range brings in dozens of stations
/
fá..
Suit
.
inel- B.B.O., Continentals, etc.
Slashed
price for cash -only
610.19.6 + 5/6 registered p. & p.
(personal phone,
4
7/6 ex.)
Ifr
_
f
t
i
batteries, etc.,
Large Bulk Purchase-Thus Large Cash
Saving9 1967 Model ALL
CAR RADIO
7 Semi -
Conductors
5 Push Buttons
-A
>a
a
l'
ry
-9
2 Full Wavebands
Extras
I
1
9.6
INCREDIBLY
SLASHED PRICE
NORMALLY COSTS DOUBLE THIS PRICE
including
Leading manufacturers high specification-Full 2 watts
output, superb tone from dynamic 6" x 4" elliptical
speaker, uncannily sensitive, latest drift transistor, full
med. & long waves, all -metal construction -not plastic,
exquisite black and silverfinish, precision elide rule
tuning brings in all B.B.C. and dozens of Continentals
WITHOUT FADING. Utter) y simple to install to any
12 volt system. Complete with all accessories, WRITTEN
GUARANTEE- Simple instructions, size 6I" x 6" x 2".
Amazing price, cash 811.9.6 + 6/6 registered post/safe
packing. Order confidently, your money back immediately
if not 100/ satisfied.
New to Great Britain -Just arrived at the Docks
THE LATEST AUTOMATIC SELF SHARPENING
PORTABLE ELECTRIC
`
RAZOR.
{`-
l
Completeaseshipment
purchased atprice.
ingly low price,
1
396
ONLY
/
i
r
-
:
-
_
PORTABLE ELECTRIC RAZOR -Shave anywhere at
any time- Long life blades sharpen themselves auto matically- Circular shaving surface is designed to give
the closest possible shave. Power unit and shaver Sts
neatly into the zip -up ease which is beautifully lined to
give that luxury finish. LIMITED QUANTITY so rush
your orders whilst stocks last. FULLY GUARANTEED.
Send only 39/6 plus 4/6 p. & p. for 7 days' home trial.
Money back if not the bargain of a lifetime.
The latest development in
TRANSISTORISED
TELEPHONE AMPLIFIERS
with Fingertip Control
'
New Low Price
ONLY
'
69/6
je
The superb new stream//-<,.25--"o
lined desk consol houses a re -t
markably powerful two-way
telephone amplifier. Fits easily to any standard telephone
in seconds and enables anyone in the room or office to hear
the telephone conversation if required Leaves both hands
free for taking notes always hear every
d. LIMITED
Direct import of manufacturers
AVAILABLE Only 750 ft at 68/8 plus
stocks. Purchase at" 9 iveaway,.QUANTITY
5/6 p. & p- Full satisfaction or your money ,funded in full.
-
1
Limited purchase direct
from the manufacturer!
-
'\
LARGEST
?
price. 950 only
92
.10
-
Amazingly accurate
.r
KING-SIZED°
x,
WRISTWATCH
rcra
Only qn/6
At our
i
really gigantic saving
at our crazy low price)
A
If you're looking for a really large (16" a
11_" -width to 8"p' lifelong' BRIEFCASE
this is the bargain of a lifetime. SOLID PIGSKINrigid framed hinged top to keep perfect shape. Large
separate internal lined pockets for tidy filing. Moulded
easy grip handle. Heavy security lock and key. Send
only 67/11 plus 5/6 p. & p. for 7 days home trial. Instant
money refund if not delighted.
J
.-e,7
dii
S
lowest ever' price
X
`t3
and finished watch with all the
latest luxury features. THIS UNREPEATABLE BARGAIN is multi jewelled with stainless steel back, diamond
tooled, antimagnetic, electrically timed for accuracy
water and duet resistant, wide sweep second hand,
luminous hour and minute hands. Slim Evergold case
complete with matching strap in reputable maker's box.
Positively our forest ever bargain at this price. Send only
49/8 plus 4/6 p. & p. for 7 days' free trial -money refunded
if not delighted.
CONCORD ELECTRONICS LIMITED
o
No more
to pay
This is the chance of a lifetime to
own a really beautifully designed
This is trulya wonder
purchase. Limited quantity
only of FABULOUS EVER 12
GOLD POCKETWATCHES
'
Now at the lowest ever
l ±price. ONLY
3
More TO Pay
4 / NO
5
/Now
atwellbelowclearance
G
- price offered
ib
these remarkably reliable
El ERGOLD pocket matches.
sM
-
Multi -Jewelled Gent's
wrong.
BRIEFCASE
I
550
_ -;q-.-
ne
bargain -just compare our
de viewer lights up autos
Price. The precision
mgtically as slide
eo viewing position ing is anen
the extra large viewing panel
BRA magnified
ORDER NEW in MAKER'S
PECTCARTON, RUSH YOUR
ORDER -WE EXPECT TO SELL OUT VERY
QUICKLY. Send only 34/6 plus 3/6 p. & p. Examine at
home, money back if not delighted.
The midiatuivtyoof of modern technology and the
increased
ro
secretaagents in everyne field havea
combined to produce these remarkably ingenious cigar
case binoculars. At first glance the simulated leather case
with plated fittings seems quite normal but press the
button and PRESTO! the case springs quietly open to
500 only bought from Importer
reveal a POWERFUL pair of lenses -rotate a concealed
focusing wheel and you have an amazing pair of binoculars.
,
hard pressed by credit squeezeLimited number available in this country so rush your''',27.-_-___.3"
Plated AUTOMATIC Self
order. Send only 39/6 plus 4/6 p. & p. for free home trial.
Full written guarantee--money refunded in full if not the
,Z !f/*,
WindingLEVER WATCH
most intriguing purchase of a lifetime.
Scoop purchase, save ££S
for f20
You've never seen such quality
as this superb lle7luxurymodellarge sr
size, 7" x 4" x 2", in per.
manent hand stitched real cowhide
case magnificent silver and black
finish, retractable 6 section teleseopic rod aerial. It also covers
F.M. waveband 88 108 megacycles
,Loverhear may interesting and
45/..TRANSISTOR
m
No more to pay! Projects FULL
SIZE Magnified PICTURE onto
your wall or screen in BLACK &
WHITE OR COLOUR with CRYSTAL CLARITY ANY
PHOTOGRAPH, DOCUMENT, picture drawing, stamp
etc- Entertaining and educational -hundreds of uses in
home, office, schoolroom, etc. A FULL SIZE precision
`-
due to drastically
yC
REAL EPISCOPE
PROJECTOR
5æa
!
.
Leading British Maker
4
'
at
not a penny more to pay. Grade A.1 De
Ç F
Luxe model, all metal construction inblack
crackle with plated parte. Accurate rack
and pinion focusing gives crystal clear
definition. 3 optically polished lenses on
"
revolving turret, giving 100x, 200x and
pelf
300x magnification powers. Adjustable
-t,
mirror light, reflector and tilting joint.
Ideal for students, hobbyists, nature
study, etc. Should last a lifetime -Passed byJapanese
Board of Inspection. Brand new in box, complete with set
slides at fraction of real worth -ONLY 37/6 plus 3/6 past
c
at "'Rock Bottom" Off
3500 Bought
.
£10.19.6c
towardsn
refunded if not delighted.
LI
..
.
10 Transistors, 3 Diodes, 2 Wavebands
AM/FM PORTABLE. By reputable
Shipment of newest Optical Development
NOW A HIGH POWERED
10-25 x 30 mm.
o
1,
-
1
O
ó
"-v"%
151
'
:
-
Designed to withstand years of constant use with high
resistant unbreakable glass. Luminous face markings
so easy to see the correct time at a glance. Fully guaranteed
DON'T MISS THIS ONCE IN A LIFETIME BARGAIN.
Send only 25/- phi; 3i6 p. & p. for 7 days' free home trial.
Money back if not your best ever bargain.
(PW.34) 87-89 TABERNACLE ST., LONDON, E.C.2.
relit%)
MONEY SAVING CHRISTMAS GIFTS
FOR
SOLID STATE "7" TRANSISTOR
Direct Import Scoop. 2 complete crates
only with 1750 of these
amazing 7 TRANSISTO R full
Frustrated Import
Shipment
OFFERED BELOW
HALF PRICE
TO CLEAR
500 only
variable waveband radios.
You could pay 6
formance.
gns. for this per-
OUR CRAZY PRICE
Your chance to own this remarkable
FULL SIZE 7 TRANSISTOR
PORTABLE at the lowest ever price.
The improved internal f errite aerialworks in car, boa or plane-pulls in loud and clear all the
programmes-B.B.C., Luxembourg, Pirates etc. the
full sized speaker gives high sensitivity and room filling
volume. Brand New and Boxed in Maker's carton
1750 only at 49/6 plus 4/6 p. & p. (Carrying case, Battery
and Earpiece 7/6 extra). Demonstrations Daily.
-
New Sensational Price
Breakthrough DIRECT
CEIVER SETS
£5.19.6
PRCE
You've heard about them-You've read about them.
NOW YOUR CHANCE TO OWN THEM. Highly
sensitive two-way transistor transceiver sets have
individual volume control and talk -listen switch. Telescopic aerial pulls in the voice from the other set over
tremendous distances-no wires-a genuine transceiver
as used by official bodies and forces. 500 sets only at
£5.19.6 plus 5/6 p. & p. (Batteries, leather eases, etc.
10/6 extra). Money back if not delighted with the performance. These cannot be operated in the U.E.
New Famous Make
Long Distance
PORTABLE
TAPE
RECORDERS
2
i
Portables
TRANSISTORS
8
+
£5.19.6
-
At last a highly sensitive full-sized tape recorder at
a price you can afford. "NOT A TOY"
but a
beautifully designed instrument which is solidly
assembled on a rigid steel chassis. You'll be amazed
at the fine reproduction of sound for all purposes
including dictating, notes, party fun, etc. Fingertip
control for volume and selector switch. Hand Microphone has unique REMOTE CONTROL on/off switch
for accurate recording and playback. 1000 only at
65.19.6, plus 5/6 p. & p. (Tape, Spare Spool, Microphone,
Batteries and Earphone 15/- extra.)
with Rotating Timing Bezel.
Your chance to own one of these
famous RADIOS-as make recommended on TV April 7th.
Amazing new -type internal ferrite
aerial-works in car, boat or plane
-pulls in all your favourite programmes, B.B.C., Pirates and
Luxembourg. Gives room -filling
volume and amazing tone from
famous "Foster" speaker. 1,000 only. Brand New with 6
Months Guarantee at 44/6 plus 4/6 p. & p. for 7 days' free
trial-your money back if it doesn't out -perform sets costing
treble. (Carrying case etc. Battery, Earpiece, etc. 7/6
extra). Demonstrations Daily.
Don't be put off by low price-see bought bankrupt stock.
extra.
SAVE YOUR LEGS!
INTERCOM OUTFIT
Er
Complete unopened crate of 1,000
only superb 1966 full variable
waveband 6 -transistor full-size
portables worth £6.
Half Price Offer
1,000 Only
NAVAL
(Pattern)
BABYALARM
Only
obustly made, brand
intercommunicating
listen to the other-complete
with 60ft. connecting wire. Fixed in a flash. Ends baby crying worries. Ideal for Workshop to House, Sickroom,
hundreds of uses! Hangs on wall or stands up. Our absurd
price 49/6, battery 2/6 extra. Post, ete. 416. Money back
guarantee.
Scoop at the Docks-a
Complete Unopened Crate
FULLY AUTOMATIC
SELF-WINDING 21 JEWELLED DATE WATCHES
Variable waveband.
OF THE
NOW A FRACTION
NORMAL PRICE
39/6
WRY PAY MORE? All the
latest refinements are packed
into this new MULTI -STATION
ALL Transistor radio-the internal
aerial picks up even the remote
stations and the powerful built-in
speaker gives room filling volume. Individual tuning,
first-class reception. Purchase with confidence-packed
in original manufacturer's cartons. (Personal earpiece
and battery 4/6). Send 39/6 ph. 4/6 p. & p.
Fraction of real worth
ONW
Money back guarantee.
Make 5 different
TRANSISTOR
RADIOS for
p
No
Necessarce
No soldering. Only 8 con-
nections for first radio
work. Just look, you
get Easy ABC Plans
Cabinet,
Loudspeaker
(alune.57/6). Earphone, 4 Semi conductors, Coils, Condensers,
6 utf, e,
Res'stors, Tuner, Switch, Screws, etc. YES-EVERY
THING! Loud clear English and Foreign reception. As
supplied to Educational Authorities, H.M. Forces, etc.
TESTIMONIALS GALORE. Mr. R. O'D of Londonerry,
writes: ".. I received your components and I must say that
I am very satisfied with them, I have it already set up! "
COMPLETE HOME/RADIO COURSE. Originally £6
SEND ONLY 39/6, plus 4/6 post etc.
"to
5®
.
CONCORD ELECTRONICS LIMITED
...
compare
below
half price.
Gent's
calendar watch by reputable
Swiss maker. Luxurious gold
finish, stainless steel screw
back-shock resistant, antimagnetic, water resistant. Unbreakable mainspring-21 Fully Working jewels. Electronically timed. Send £5.7,6, plus 4/8 p. & p. Matching
expanding bracelet 10/6 extra. Brand New with guarantee.
NEW RADIO No soldering
VOLKSRADIO
ANYONE CAN BUILD
IN 2-3 HOURS
ONLY
25/-
EVEN THE OLDER
CHILDREN
BUILD
THEM! . . no soldering-only 16 connections! then hear it
reach out bringing in
station after station, loud and clear. Palm-of -hand size
45 x 25 x 15in. Many Testimonials: M, H. of Bradford
I have just completed one of your sets successwrites: "
fully, it is the first time I have ever tackled anything like
radio, and I must state here and now, I am amazed how
easy it is to a layman like me. Your instructions and plan
have obviously been very carefully thought out so that even
the most dim can follow them
" Direct from Manufacturers to You. Send 25/- plus 2/6 post, etc.
...
PARTS AVAILABLE SEPARATELY.
TRANSISTOR POCKET RADIOS
with Loudspeaker. Bulk Purchase
Enables us to Make
this Fantastic Offer
Only
including real pigskin case. Superb area magnifications of
15 times. Brand new. Grade A.2 de luxe model by leading
optical manufacturer. Full size, metal construction, lightweight, precision ground and polished optical lenses for
wide angle, needle sharp definition. Telescopic draw tubes
with smooth action centre focusing and infer pupilary pivot.
Takes you into space or just across the road. Save £ £ L'sONLY 45/-, incl. real pigskin case and shoulder strap,
plus 4/6 p. & p. Order quickly while limited stocks last.
3`9/ "
£5.7.6
prices locally
1,500 only to be cleared at
32/6 Notomore
pay
The "SAN REMO"
so tuned that it brings
the voices of star vocalists
NO MORE TO PAY
NEW FULLY
TRANSISTORISED
PORTABLE RADIOS
ONLY
"...
45/ -
49/6
new current models,
You get 2 separate
fully
transistorised
Full
44/6
BINOCULARS
Ready Built
with
watch your friends astonishment on hearing it
fetch in station after
station, loud and clear! Still holds 10 cigarettes-yet
cleverly conceals highly sensitive, fully transistorised circuit (including tiny battery)- Even a young boy can assemble it under 2 hours. No soldering. No experience
necessary. Only 16 connections to make, Ideal for taking
to work with you. From our bulging testimonial file
Mr. D. B. of Huddersfield, writes:
i have fitted the
parts in it and it is working wonderfully ... " ALL PARTS
including Semi-Conductors, ABC Plans, etc. ONLY 25/-.
plus 2/6 post, etc. Parts Available Separately.
DOUBLE,
ex.).
97/6
or
25/ -
packet of cigarettes! But
more than
Miraculous Scoop from
Swiss Mnfr.
Limited Shipment NEW
21 JEWELLED
DIVER'S WATCH
Staggering price reductioncompare prices
locally. 950 only at
Make a genuine LARGE CASH
SAVING on this high -quality
watch, 200 vacuum tested for
depth. 21 Jewelled movement.
...:bii !lid
Shock -proof, electronically timed, lum. dial and hands.
Ideal for skin-divers, sailing, motoring, research work
for accuracy. FULLY GUARANTEED. Send only
97/6 plus 4/6 p. & p. TEST AT HOME. Money back
guarantee. STAINLESS STEEL expanding bracelet 12/6
sets-each can speak
ONLY
FULL WAVEBANDS
-
!
Yes a perfectly ordinary
Same in performance as sets costing
The highly sensitive internal
Demonstrations
Ferrite Aerial Plus Multi
section telescopic aerial of
this powerful full size
radio pulls in 100's of
Inter -Continental Stations
including B.B.C., Luxembourg, Pirates
the lot.
Superb Hi-Fi tone from
famous big Speaker at hall
filling volume. Works in car, plane
or boat. 900 Only. Brand New Boxed
with Guarantee at 89/6 } P & P 4/6.
for 7 days home trial-money back guar.
(leather case, shoulder sling, earphone, 4 bats., etc., 9/6
!
AMAZING
Act Now 900 Only
You've seen recorders at
more than twice our price
!
r
!
CIGARETTE
RADIO
Fantastic stock clearance from Importer
IMPORT1000onIy
High powered
NOW
ONLY
TRANSISTOR
PERSONAL TRANS 5
49/6
!
SOLDERING
NO
-
dramatically to life
in
your home, office, etc.
Only 45 x 21 x 151n.
Fits easily into your pocket
or handbag. Works for months
off 1/2 battery. Should last a lifetime, anyone can
assemble it in an hour or two with our easy plan.
Miniature speaker-everything, only 32/6. 3/6 p. & p.
(Parts can be bought separately). Limited supply-so
rush your order before it's too late.
Miraculous Import Purchase
200 Only NOW
HAVE MUSIC IN
EVERY ROOM
Extension speaker
More than doubles the
value of your
For
Only
radio.
27/5 Complete
Just place this ultra modern extension speaker in any room and tune
in to your favourite programmes-Now you can relay
even from HI-FI radiograms down to transistor
portables. Simply place in position or fix on wall and
plug in the long lead supplied. What could be easier?
DON'T MISS THIS AMAZING BARGAIN, remember
200 only at this price 27/6, plus 3/6 p. & p. Money
instantly refunded if not worth more than double.
87-89 TABERNACLE ST., LONDON, E.C.2.
(P.W.34)
CALLERS WELCOME-DEMONSTRATIONS DAILY
551
RSC
TO:
ORDERS
MAIL
Lane
Henconner
102
Leeds
Bramley,
13
-NEWCASTLE
LONDONnow
open - see addresses
New branches
Terms: C.W.O. or C.O.D. No C.O.D. under£1.
Postage 3/6 extra under £2. 5/6 extra under £5.
Trade Supplied. S.A.E. with all enquiries
Personal shoppers welcome at
please.
the following branches. Open all day Saks.
HI-FI LOUDSPEAKER ENCLOSURES
All types of pleasing modern "slimline" design
acoustically lined and ported and in finishes of
light Teak or medium Walnut.
SE8. For optimum performance with
any Hi-Fi 8in, speaker. £55.15.0
2 349
Size 22 x 15 x 7in. Carr. 7/6
Tel.
2904
SESO. For 10in. Hi-Fi speaker with provision for tweeter. Carr. £6.19:9
-
BRADFORD (Halt dan Wed )e
St.
BRISTOL (Half-day14 r Castle
Wed.)
Gt.
BIRMINGHAM
Hill Station.
CENtral 1279.
DERBY
(HalOd
x
101-
SE12. For outstanding performance with
any 12ín. HI -Fi speaker. Cut for tweeter. 8
MHO'
Size 24 x 20 x Sin Or Deposit 27/- and 9
monthly payments of 18/2 (Total £9.10.6.) Carr. 101FHE8. Folded Horn type. Size 27 x 16 x loin. Designed
for high flux 8in. speaker with which 9 Gns.
quality can be obtained.
Street exceptional
Terms Deposit 21/- and 9 monthly pay- Carr. 10/Wed.) ments 21/-. (Total 10 Gns).
t
Post
Wynd
Leith
EDINBURGH 133
(Half-day
GLASGOW (No half-day))
Sayi
HULL Thursday)51
e Tel.:Street
41361
House
-day
13
Wednesday) Tel.: 68043
CITY T4158
(Half -day
0505
eTel.:
LEICESTER day HThurs.)
56420
Arcadeca)
5-7 County
LEEDS (No Half-day) Tel:
Tel.:
7day)
LIVERPOOL
Tel. SCENtral 3573
Edgware Road,
(Half -day Thursday)
W2
238
LOIIDOII
Tel.:
PADdington
New large
No
Tel.:
60A -60B Oldham St.
1629
Holborn, WC1
High
96
MANCHESTER
half-day)store
CENtral 2778
MIDDLESBROUGH
Wednesdyay)
Tel.:
Newport Road.
47096
Blackett Street
Opp Fenwicks Store
Half day Wed.
Tel: 21469
39
NEWCASTLE
SHEFFIELD
Tel.:
15
half-day
No
ystWed.7., Telle
DARLINGTON
106
Size 24 x
Ar cade,opp. Snow
20716
AUDIOTRINE HI-FI 'SPEAKER SYSTEMS
Consisting of matched 12ín. 12,000 line,
15 ohm high quality speaker: cross-over
unit and Tweeter. Smooth response
and extended frequency range ensure
surprisingly realistic reproduction.
Standard 10 watt rating. Or 5 Gns.
Senior 20 watt inc. Fane
Carr. 5/6
122/10 speaker £6.19.9. Carr.
7/6. Or Dep. 21/- and 9 mthly pmts of 15/4 (Ttl £7.19.0).
/\
AUDIOTRINE HIGH FIDELITY 'SPEAKERS
Heavy cast construction. Latest high efflcency
magnets.range.
Dual Coastneicfor exte
ceraedmiofrequency
Pl
treatned
F
J
surround giving low fundamental
resonance. Response 30-20,000 c.p.s.,
or
15
ohms.
Carr.
5/6.
3
jImpedance
HF811D 8 in. 10 WATT
4 Gns.
in. 15 WATT
/ HFIOOD 10
£5.15.0
HF12113 12 in. 20 WATT
£6.15.0
IIF127D 12 in. 30 WATT
9 Gns.
TWEETERS R.A. 3 ohm 25/9. 15 ohm 25/9
HIGH FIDELITY LOUDSPEAKER UNITS
Cabinets of latest styling finished Satin Teak or Walnut, acoustically lined. (and ported where appropriate.)
MINI -8 8 WATT rating. 3 or 15 ohm. Frequency
response 50-13,000 c.p.s. Specially designed high flux 51n. speaker with low
fundamental resonance.
Teak veneered cabinet.
91 x 65 x
Rating
(Half-day Thursday)
15 watt HI-FI TRANSISTORISED
AMPLIFIER TYPE A15
with integral preanïp tone control
stages. Output tor 3,
15t5(ó'
and
9
The DORCHESTER
Frequency range
Size 24 x
15 x
Sins.
Fitted
Audiotrine HF100D Speaker. Rating 15 watts
Impedance 15 ohms. Frequency Response 30-20,000
c.p.s. Or Deposit 39/6 and 9 monthly
Gns,
payments 27/3 Total £14.4.9. Carr. 15/ -
l2
The GLOUCESTER Handsome "slimline" cabinet. Size 24 x 20 x 8in. 12 in. high flux 12,000 line
speaker. Cross-over unit and Tweeter.
Rating 10 watts. Smooth response
40-20.000 c.p.s. Impedance 15 ohms.
Or Deposit 36/- and 911
Gns.
monthly payments 25/(Total £13.1.0).
Carr. 15/The BRONTE Size
22
x 15 x 71in.
Fitted Wharfedale Super 8 RSDD
Speaker, with Roll surround and dual cone. Rating
watts. Impedance 15 ohms. Or Deposit 39/6 and
9 monthly payments 27/3Carr.
(Total15/12 Gns.
6
AUDIOTRINE PLINTHS
for Record Playing units.
Teak finish cut for Garrard
1000, 2000. 3000, ATO Mk 2
AT60, SP25 or Goldring GL68.
Available with clear Perspex
cover as illustrated £5.19.11.
complete
QUALITY AMPLIFIER
the construction of a unit giving 5 watts high quality
output on each channel (total 10 watts). Sensitivity is 50 millivolts. Suitable
all crystal or ceramic stereo heads. Ganged Bass and Treble Controls. Provision
is made for use as straight (monaural) 10 watt amplifier. Valve line-up ECC83,
ECC83, EL84, EL84, EZ81. Outputs for 2-3 ohm speakers. Point to point wiring
diagrams and instructions supplied. Send S.A.E. for leaflet. Or supplied factory
assembled with 12 months' guarantee for 11 ans. Terms: Dep. 36/- £8.15.0
Carr. 11/6
monthly payments 25/5 (Total £13.4.9).
R.S.C. STEREOJ20 HIGH
FIDELITY AMPLIFIER
LINEAR PUSH-PULL OUTPUT ON
PROVIDING 10/14 WATT ULTRA
EACH CHANNEL. SUITABLE FOR MIKE", GRAM, RADIO OR TAPE.
Employing valves ECC83. ECC83, ECL86, ECL86, ECL86, ECL86. EZ81. Frequency
Level: 65dB down. Sensitivity: 5 millivolts
Response: +2dB 30-20,000 c.p.s. Hum
maximum. Harmonic Distortion: (each channel): 0.2%. * Four -position tone
Selector Switch. * Stereo/Mono switch.
compensation and Input
from Tape Heads. * Neon panel indicator. * Handsome Perspex Frontplate.
* Will amplify direct
transformers are high Separate Bass'"Lift" and "Cut" and treble "Lift" and "Cut" controls. Output
*
and 15 ohm speakers on each
quality sectionally wound to required specification. Output matching for 3instructions.
Send
channel. Complete set of parts with point-to-point wiring diagrams and
Carr. 12/6 14 Gns.
s.a.e. for leaflet.
Or factory assembled, tested and supplied with our usual 12 months guarantee. Or Deposit £3 19 Gns.
Carr.
12/6
(Total
43/2
£22.4.6).
and 9 monthly payments
spkrs.
Kit includes Printed
Circuit and all parts
including 9 Muilard
or Newmarket latest £6.19.9 Post
5/ type semi -conductors
or
Heat sink and full wiring instructions
wired and tested
with printed circuit fully
30/- extra. Frequency Response: + 1dB
0.1./
Distortion:
Harmonic
cps.
20-20,000
Noise:
measured at 1000 C.o.s. Hum and
-80dB. Sensitivity: 2mV. Bass Control: R.S.C.
+9dB to -14óB at 40 c.p.s. Treble Con10 He/s. Suitable
trol: +8dB to -13dB at
Power Pack Kit 39/6 or ready built 59/6.
7.5 and 15 ohm
watts.
10
45-20,000 c.p.s. Fitted specially designed
Heavy cast 51n. speaker with large pole pieces, extra
long voice coil and rubber cone surround. Impedance
3 ohms or 15 ohms. Or Deposit 36/- and 9
monthly payments of 25/- (Total £13.1.0). 11 Gns.
A complete set of parts for
ALL LEADING MAKES OF HI-FI
EQUIP. STOCKED Cash or Terms
Handsome
£6/19/11
THE 'PETITE' Really astounding performance. Size only 100 x 65 x 71in.
R.S.C. STEREO/TEN HIGH
Bdgst.
1CastleExcMarket
Carr. 7/6
Tin.
TFM1 TRANSISTORISED VHF/FM RADIO TUNER *High-sensitivity
*
200-250v. A.C. Mains operation. * Sharp A.M. Rejection. * Drift free reception. * Output ample for any amplifier (approx. 500 m.v.).
*tuning
Simple alignment instructions. * Output available for feeding
meter. * Output for feeding Stereo Multi-plexer. * Tuner
Designed for standard 80
head
Silicon Planar Transistors.
Complete Kit with valves £6.19.11
Total cost of parts with detailed wiring
diagrams and instructions. 12 Gns.
2
Or factory built 15i Gns.
101Or in Teak finished cabinet Carr.
as illustrated 19i Gns. Terms: Deposit
85 and 9 mthly payments 39/- Total £22.11.0.
JASON VHF/FM TUNER
*
using
ohm co -axial input.
Made to visually match our Super 15 and 30 amplifiers and of the same high
standard of performance and reliability. The pre -wired tuning head facilitates speed and simplicity of construction. Printed circuitry. Only first
grade transistors and components used. Our latest product giving you the
best at half the cost of comparable units.
1
TECHNICAL R.SC.SuPER30STEREOMIPI/f/ER
R S C. SttPIE/Q /Sf'flf/1°L/ffER
Mains. SPECIFICATIONS COMPARE MORE A DUAL CHANNEL VERSION OF THE SUPER
FULLY TRANSISTORISED 200/250v. A.C.
Employing Twin Printed Circuits. Close tolerance
into 15 ohms.
THAN FAVOURABLY with SIMILAR 15.
OUTPUT 10 WATTS R.M.S. cont.
Pots. Matched Components.
15 WATTS R.M.S. cont. into 3-4 ohms.
AMPLIFIERS AT TWICE THE COST Ganged
CROSS TALK: -52dB at 1,000 c.p.s.
Maximum instantaneous Peak power output 28 watts.
5 position Input Selector, Bass Control.
CONTROLS:
CONSTRUCTION.
CIRCUIT
PRINTED
Treble Control, Volume Control, Balance Control, Stereo/
AD149,
LATEST MULLARD TRANSISTORS. AD149,
Mono Switch, Tape Monitor Switch, Mains Switch.
OC127Z, OC81Z, OC44, OC44, OC81Z, OC44, AC107.
INPUT
SOCKETS
(Matched Pairs). (1) Magnetic P.U.
5 POSITION INPUT SELECTOR SWITCH
I.
(2) Ceramic or Crystal P.U. (3) Radio/Aux. (4) Tape Head/
and C.C.LR.
EQUALISATION to Standard R.I.A.A.
Microphone.
-Heads.
Tape
and
Characteristics for Gram
Operation of the Input Selector Switch assures appropriate
FACILITIES.
FULL TAPE MONITORINGP.U.
equalisation.
j_'
-et
4 mV. Crystal or
SENSITIVITIES: Magnetic
Rigid 18 s.w.g. Chassis. Size approx. 12in. Wide, Sin. High
-mV. Tape Head
Ceramic P.U. 400 mV. Microphone 4.5
and 8in. Deep. Neon Panel Indicator. Attractive Facia
-=
110
mV.
P.U.
Ceramic
-=-_
or
2.5 mV. Radio/Aux
Plate
and
Spun
Silver Matching Knobs. Above facilities, etc., except for
C.O.S.
FREQUENCY RESPONSE: ± 2dB 20-20,000
Ganging and Balance Control, apply also to Super 15.
Kola.
TREBLE CONTROL: +15dB to -14dBatat50Idc/s.
THESE UNITS ARE EMINENTLY SUITABLE FOR USE WITH
HUM LEVEL: -75dB.
BASS CONTROL: +12dB to -15dB
ANY MAKE OF PICK-UP OR MICROPHONE (Crystal, Ceramic,
1,000 C.O.S. 0.3%.
HARMONIC DISTORTION at 10 Watts R.M.S. Carr.
Magnetic, Moving Coil, Ribbon) CURRENTLY AVAILABLE,
10152dB.
NEGATIVE FEEDBACK:full
BY
BEN
SOUND OUTPUT QUALITY
constructional details and 10 2 Gns.
Complete Kit of parts with
CA Y EQUIPMENT. All
E
USING WITH FIRST
point to point wiringdiagrams.
diagrams
and detailed 18 Gns.
to
point
wiring
required
parts,
point
Teak
or
Walnut
in
beautiful
Or
fitted
140
Gns.
built
factory
Supplied
Carr. 12/6
instructions.
veneered cabinet as illustrated, 185 Gns.
Unit factory built 25 Gns. or deposit 811- and 9 monthly payments 55/9
(Total £21.13.6). Carr. 12/6.
Or Deposit £3.9.0 and 9 mthly pmts 40/6
(Total £29.2.9). Fitted cabinet as Super 15 29 Gns. Carr. 15/- or Deposit
ARE OF A HIGH STANDARD AND
ALL COMPONENTS ETC. BRITISH
£4.12.0 and 9 mthly paymts 84/10 (Total £33.15.6). Send S.A.E. for leaflet.
MANUFACTURERS.
SUPPLIED BY LEADING
___-..--.-,
.
a
";
E
RATSUPERB
552
OE
AUDIOTRINE HI-FI TAPE RECORDER KIT
S.A.E. for
REALISM AT INCREDIBLY LOW COST.
leaflets.
CAN BE ASSEMBLED IN AN HOUR.
ONLY 4 PAIRS OF SOLDERED JOINTS PLUS MAINS.
Incorporating the latest Magnavox Tapedeck. The Audiotrine
High Quality Tape Amplifier with switched equalisation for each
of 3 speeds. High Flux P.M. Speaker, empty Tape Spool, a Reel
of Best Quality Tape and a handsome Portable Cabinet of latest
styling finished dark grey leathercloth. Size 14i x 17 x 81ín. and
circuit. Purchased separately would total approx. £34. Perform1
ance equal to units in the £50-260 class. Deposit
4 gns, and 9 mthly paymts 59/6 (Total 290 gns.) 26h 2 Gns.
Carr. 19/6
4 Track Model 3 gns. extra.
LINEAR TAPE PRE -AMPLIFIER. Type LP/1 Switched Equalisation. Positions for
f1
Recording at lain., 30in., nip. per sec., and Playback. EM84 Recording
Level Indicator. Designed primarily as the link between a Magnavox
2 Gns.
Tape Deck and Hi-Fi amplifier suitable most Tape Decks. Terms available.
¡
.ie
R.S.C. 4/5
I
watt A5 HIGH GAIN AMPLIFIER
A highly -sensitive 4-valve quality amplifier for the home, small
club, etc. Suitable for all crystal or ceramic P.U. heads and practically all "mikes". Separate Bass and Treble controls giving "lift"
and "cut". Hum level 71dB down. Negative Feedback 15dB. Reserve
power supply 300v 25 m.a., 6.3v 1.5 a. for Radio Tuner or Tape Pre amp. Foi A.C. mains 200-250v. Speaker output 3 ohms. Complete in every detail with
fully punched enamelled chassis, point-to-point wiring diagrams and £4.17.9
instructions. Or assembled ready for use 6 gns. plus 5/6 cary.
-`
R.S.C. A10 30
WATT ULTRA LINEAR HI-FI AMPLIFIER
Highly sensitive. Push-Pull high output, with Pre-amp./Tone Control
Stages. Performance figures equal to most expensive amplifiers
available. Hum level-70dB. Frequency response t3dB 30-20,000 c/s.
Specially designed sectionally wound ultra linear output transformer
with 807 output valves. All first grade components. Valves EF86,
EF86, ECC83, 807, 807, GZ34. Separate Bass and Treble Controls.
Sensitivity 12 millivolts so that any kind of Microphone or
Pick-up is suitable. Designed for Clubs, Schools, Theatres,
Dance Halls or Outdoor Functions, etc. For use with Electronic Organ, Guitar, String Bass, etc. Gram, Radio or Tape.
Reserve L.T. and H.T. for Radio Tuner. Two inputs with associated volume controls so that two separate inputs such as Gram and "Mike can be mixed- 200250v. 50 c/s A.C. mains. For 3 and 15 ohm speakers. Complete kit of parts
Carr.
fully punched chassis, point to point wiring diagrams and instructions. 12 Gns 12/6
Supplied factory built with EL34 output valves, 12 months guarantee for 15 gns. If required
s.a.e, for leaflet.
with
TERMS:Deposi t 48/ and9monthlypaymentoof 33/7 (Total 217.10.3)end
R.S.C.
All
HIGH FIDELITY 12-14 WATT AMPLIFIER
PUSH-PULL ULTRA LINEAR OUTPUT "BUILT-IN"
TONE CONTROL PRE -AMP Two input sockets with associated controls allow mixing of "mike" and gram. etc., etc. High
sensitivity. Valves ECC83,ECC33, EL84, EL84, EZ81. High quality
sectionally wound output transformer specially designed for
Ultra Linear operation and reliable small condensers of current
manufacture. LQDIVIDUAL CONTROLS FOR BASS AND
TREBLE. Frequency response t3dB 30-20,000 c/s. Six negative
feedback loops. Hum level -60dB. SENSITIVITY 23 millivolts.
Suitable for Crystal or Ceramic P.Us, all types "mikes". Comparable with the very best designs. For Musical Instruments
such as String Bass, Electronic Guitars, etc. Reserve Power provides 300v. 30mA, and
6.3v. 1 5a. for Radio Tuner or Tape Pre -amp. Size approx. 12 x 9 x 7fn. For A.C. mains 200250v. 50 c.o.s. Output for 3 and 15 ohm speakers. Kit complete to last nut.
£$.15.0
Chassis fully punched. Full instructions and point-to-point wiring
Carr. 11/6
diagrams (or factory built £11.15.0). Metal covers with 2 carrying handles
can be supplied for 21/-. TERMS ON ASSEMBLED UNITS: Deposit 38/6 and 9 monthly
payments of 25/9 (Total £13.8.3). Send S.A.E. for leaflet of Cabinets, Speakers, Mikes, etc.
R.S.C. BASS -REGENT 50
WATT AMPLIFIER
AN EXCEPTIONALLY POWERFUL HIGH QUALITY ALL-PURPOSE
UNIT For lead, rhythm, bass guitar and all other musical instruments.
For vocalists, gram, radio, tape and general public address
HI5/6. RSC
FANE HEAVY DUTY
SPEAKERS
12in. 20 watt. Type 122/10.
Incorporating massive 15in. high flux loudspeaker. Rating 25 watts. Individual bass and
treble controls. Two jack inputs separately
controlled. Substantial cabinet attractively
finished in Rexine and Vynair. Size approx.
24 x 21 x i1in. Send S.A.E. for leaflet.
2 Gns
Or Deposit £4.14.6 and 9 monthly 291
payments of 66/- (Total £34.8.6). Carr. 17/6.
LINEAR TREMOLO PRE -AMP UNIT suitable for
use with any of our Amplifiers. Controls are Speed
(frequency of interruptions). Depth (for Al Gns
heavy or light effect). Volume and Switch. 2
x5in. OrDeposit£2 nd 122 Gns.
9mthlypmts28/-(Total£14.12.0) Carr. 10/Type C412, 40 watts, Fitted four 121n. 12,000 line
10 watt speakers. Overall size
56 x 14 x 9in. approx. Carr. 15/- 1 9 2 Gns.
Or Deposit 3 gns. and 9 monthly payments of
43/7 (Total £22.15.3).
30
WATT HI-FI AMPLIFIER
for Guitar, Vocal or Instrumental Group
A Four Input, two volume control Hi -Pi unit
with separate Bass and
Treble "cut" and "boost"
controls. Latest type
valves. Housed in strong
Rexine covered cabinet with twin
carrying handles. Attractive black
and gold perspex facia plate.
For 200-250v. A.C. mains. Output for
3 or 15 ohm speakCarr.
1 7 G nS 12/6
ers. Send S.A.E. for leaflet. Deposit
£3 and 9 monthly payments of 37/5 (Total £19.16.9).
12in. HIGH QUALITY LOUDSPEAKERS
In walnut veneered cabinet. 10 Watt
Model. Gauss 12,000 lines.f4.19.11
Speech coil 3 or 15 ohms.
Terms: Deposit 15/- and 9 Carr. 7/6
monthly payments of 11/2 (Total £5.15.6)
20 Watt Model, 15 ohm. Size 18x18x10in.
Terms: Deposit 24/6 and 97 S
1
11
monthly payments of 17/3
(Total 98.19.9).
Carr. 10/6
30 Watt Model. 15 ohms. Or
Mote
Deposit 32/- and 9 monthly
Carr. 12/6
payments of 22/4 (Total £11.13.0). Any of above in extra
heavy Rexine covered Cabinets, £1 extra.
R.S.C. GRAM AMPLIFIER KIT. 3 watts output.
Negative feedback. Controls: Vol., Tone and Switch.
Mains operation 200-250v. A.C. Fully isolated chassis.
Circuit, etc. supplied. Only 44/9. Carr. 3/9.
l0
HIGH QUALITY 12ín.10 WATT SPEAKERS
12,000 lines. 3 or 15 ohms.
Flux Density
POWER PACK KIT Consisting of Mains Trans-
former, Metal Rectifier, Electrolytics, smoothing
choke, chassis and circuit. 200/250v. A.C.122/
mains. Output 250v. 60mA, 6.3v. 2a supplied
with case in lieu of chassis for 26/11.
R.S.C. BATTERY/MAINS CONVERSION UNITS
Type BM1.
An all -dry battery
eliminator. Size 50x41 x tin. approx.
Completely replaces batteries supplying 1.5v. and 90v. where A.C.
.'l mains 200/250v. 50 c/s is available.
Complete kit with diagram 44/9 or
ready for use 59/11.
RECTIFIERS
F.W. (Bridged)
SELENIUM
All 6/12 v. D.C. output. Max A.C. input 18 v.
4
2
a.
3
a.
a. 12/9. 6 a. 15/9.
6/11.
9/9.
1 a. 3/11.
INTEREST
CHARGES
REFUNDED
on H.P. and
Credit Sale
Accounts
settled in
3 months.
WATT AMPLIFIER for Lead or
Rhythm Guitar, Mike, Gram or Radio
High-fidelity output. Separate bass and treble
controls. Twin separately controlled inputs so
that two instruments or "mike" and pick-ups
can be used at the same time. Heavy Duty 12in.
20 watt Speaker.
Cabinet covered in attractive
Rexine/Vynair. Size 18 x 18 x lin. Deposit 3 gns.
and
9 monthly payments of 43/7
l912 Gns.Carr.
15/-. (Total £22.15.3). S.A.E. for leaflet.
TWIN AMPLIFIER
Rating 20 watts (max.) for vocalists, Lead or Rhythm Guitar
etc. Twin separately controlled inputs. Two 12in. High Flux
Speakers (Total rating 30 watts). Attractive Rexine/Vynair
covered cabinet. Terms: Deposit £4.6.8 and dye Carr. 17/6
LJJ Gns.
9 monthly payments 50/- (Total £26.16.8).
SPECIAL PURCHASE! 12in. 30 WATT HEAVY
DUTY 15 ohm LOUDSPEAKERS 7 Carr.12/6
GNS.
Flux Density 17,000 lines. Fully Guaranteed.
Outstanding value at normal price of approx. ill. Or deposit
23/10 and
9
monthly payments of 15/6 (Total £8.3.4).
HEAVY DUTY SELENIUM RECTIFIERS
12v. 15 amps. F.W. (Bridged).
Only
HEAVY DUTY BATTERY CHARGER KITS 8/12 v.
Consisting of Mains Trans. 200-250 v., Rectifier,
19/9
Ammeter, Variable Charge Rate Selector, Panels,
Plugs, Fuses and Holders. Fully punched stove
enamelled case and 49/11
6 a. 69/11
circuit.
4 a.
59/11
TRANSISTOR SALE Mollard 0071 2/11, 0C45
0044 3/11, OC72 2/11, OC75 719, OC81 2/11, 0C171 3/11,
AF117 6/9. Ediswan XA101 3/9, XA112 3/9, XC1O1A 8/9.
3/9.
Postage 6d. for up to 3 transistors.
G15 15
G20 SUPER
GNS.
s42x1k
UNUSUALLY POWERFUL LOUDSPEAKER COMBINATION
consisting of a FANE HIGH FLUX 15in. 30 watt unit PLUS
a FANE 12ín. 20 watt unit with extended frequency response. k 4 Jack Inputs
and two Volume Controls for simultaneous use of up to 4 pick-ups or "mikes".
in two-tone Rexine/Vynair with gold trimming. Fitted carry* Cabinets coveredSeparate
Bass and Treble Controls giving "lift" and "cut".
ing handles. k
Send S.A.E. for leaflet. Or call at one of our many branches and
491 Gns,compare the Bass -Regent with units at three times the cost.
deposit
Or
Carr. 30/£7.17.6 and 9 monthly payments of £5.10.10. (Total 55 gns.)
especially suitable for Bass Guitar
5
R.S.C. COLUMN SPEAKERS Covered in
two-tone Rexine/Vynair. Ideal for vocalists
and Public Address. 15 ohm matching.
Type C58, 15-20 watts. Fitted five 8in, high flux
*
B20 MULTI -PURPOSE AMPLIFIER
Post
R.S.C. MAINS TRANSFORMERS
FULLY GUARANTEED, Interleaved and Impregnated. Primaries 200-250v. 50 e/a. Screened.
MIDGET CLAMPED TYPE 28 x 2i x lila,
250v., 60mA, 6.3v. 2a
14/11
250-0-250v., 60mA, 6.3v. 2a
15/11
^LILLY SHROUDED UPRIGHT MOUNTING
250-0-250v. 60mA, 6.3v. 2a, 0-5-6.3v. 2a,
2; x 3 x 3in.
19/9
250.0.110v. 100mA, 6.3v. 4a, 0-5-6.1v. 3a. ,
33/9
300-0-300v. 100mA, 6.3v. 4m 0-5-6.3v. 3a. , - 33/9
300-0-300v. 130mA, 6.3v. 4a ut., 6.3v. la
For Mollard 510 Amplifier
41/9
350-0-350v. 100mA, 6.3v. 4a, 0.5.6.3v. 3a.
33/9
350-0-350v. 150mA, 6.3v. 4a, 0-5-6.3v. 3a
42/9
425-0.425v. 200mA, 6.3v. 4a, c.t., 5v. 3a
6719
425-0-425v. 200mA, 6.3v. 4a, 6.3v. 4a, 5v. 3a 69/9
450-0-450v. 250mA, 6.3v. 4a, ut., 5v. 3a
79/9
TOP SHROUDED DROP -THROUGH TYPE
250-0-250v. 70mA, 6.3v. la., 0.5.6.3v. 2a
19/9
250-0-250v. 100mA, 6.2v. 3.5a
21/9
250-0-250v. 100mA, 6.3v. 2a, 6.3v. la
22/9
350-0-250v.80mA, 6.3v. la, 0-5.3.3v. la
23/9
250.0.250v, 100mA, 6.3v. 4a, 0-5-6.3v. 3a
32/9
300-0-300v. 100mA, 6.3v. 4a, 0.0.6.3v. 3a
32/9
100-0-300v. 130mA, 6.3v. 4a, 0-5.13.3v. la.
Suitable for Mallard 510 Amplifier
39/9
350-0-350v. 100mA, 6.3v. 4a, 0-5-6.3v. 35
32/9
350.0-350v. 150mA, 6.3v. 4a, 0-5-6.3v. la
39/11
FILAMENT or TRANSISTOR POWER PACK Types
6.3v. 1.5a 6/9,6.3v. 2a 7/9, 6.3v. 3a 9/9,6.3v. 6a 19/9,
12v. la 8/9,12v. 3a or 24v. 1.5a 19/9, 0-25.21.42v. 2a
27/9.
CHARGER TRANSFORMERS 0-9-15v. lIa, 13/9,
0-9-15v.2$a,16/9,0.9-15v. 3a, 18/9,0-9-15v. la, 21/9,
0.9-15v. 60, 25/11, 0-9-15v. 8a, 31/9.
AUTO (Step UP/Step DOWN) TRANSFORMERS
0-110/120v:200 -230-250v.
50-80 watts
250 watts .. 49/9
14/9
150 watts
29/11
500 watts .. 99/9
OUTPUT TRANSFORMERS
Standard Pentode 5,000, to 30 or 7,00053
to 30
7/9
Push -Pull 8 watts EL84 to 30 or 150
11/9
Push-pul110-12 watts OVO to 30 or 150
18/9
Push-pull 10.12 watts to match 6V6 to 3, 5, 8
or 150
21/9
Push-pull EL84 to 3 or 150 10-12 watts
19/9
Push-pull Ultra Linear for Mallard 510, etc
35/9
Push-pull is -lo watts, sectionallywound 61,6,
%T86, etc., for 3 or 150
22/9
Push-pull 20 watt high quality sectionally
wound, EL34, 6L8, 11T66, etc., to 3 or
150 fully shrouded
55/9
SMOOTHING CHOKES
150 mA, 7-10H, 2500 12/9. 80mA, 10H, 3500 7/9.
100mA, 10H, 2000 9/11. 60mA, 10H, 4000 4/11.
,
553
:::RAD IONIC
RADIO Et ELECTRONIC
CONSTRUCTION SYSTEM
ABSORBING
and
EXCITING!
Unique and brilliantly simple. hundreds of educational establishments-Universities, Technical Colleges, Schools, the Armed Forcesare already using Radionie for electronic instruction. Enthusiastic
owners range from 9 to 82 years of age.
Selected by the Council of Industrial Design for all British Design
Centres. Featured in Sound and Television broadcasts.
The system is beautifully engineered from top quality British components. No
soldering. No mains. No prior knowledge needed. Simply arrange components
on perforated transparent panel, position brass connecting strip underneath
fix with SBA nuts and circuit works with full efficiency. You can then dismantle and build another circuit. Your results are guaranteed by our
Technical Department and News Letter Service. All parts available
separately for conversion or expansion of sets.
NEW! Our "No soldering" printed circuit board for superhet portable.
Simply insert components and tighten nuts.
No. 1 Set
56.0.2 14 Circuits (Earphone)
No. 2 Set
£7.1.5 20 Circuits (Earphone)
No. 3 Set 511.2.7 22 Circuits (7 x 4in. Loudspeaker output)
No. 4 Set 515.3.8 26 Circuits (include 6 Transistor and reflex superhets)
Prices (Post Free)
(Plus P.T. increases of 1/8; 1/11; 3/1; 4/2d respectively.)
6 -TRANSISTOR
A No. 4 SET and
SUPERHET
Full details from:
RADIONIC PRODUCTS LIMITED
STEPHENSON WAY, THREE BRIDGES
CRAWLEY, SUSSEX
Tel. CRAWLEY
(Trade Enquiries invited)
27;28
Theoretical Circuit
Practical Layout
Our 'E' Series of basic electronic circuits is available separately. Send
for details of E/508 our do-it-yourself computer
PAD 1515
OLRUS ELECTRONICS LTD.
London,
Praed
St.)
W.2
9 Norfolk Place (off
PUBLICATIONS
for the
FULLY GUARANTEED
DAF91
DAF96
DF91
DF96
DK91
DK92
DK96
DL92
DL94
DL96
EBC41
EBC81
EBC90
50081
E0082
50083
ECM
ECH35
ECH42
ECL80
ECL82
ECL86
EF80
EF86
EL41
EL84
E1484
EY51
EY86
EZ40
EZ80
GZ32
4/6 PCL84
6/6 PCL85
8/- PCL86
7/- PL36
5/6 PL81
8/- PL82
7/- PL83
5/- PL84
5/9 PY32
71- PY81
716 PY83
6/3 2313041
4/3 UBC81
PCF80
PCF86
PCL82
PCLS3
7/6
9/8/6
9/7/6/6
616
6/6
8/6
8/13/-
7/6
7/6
41- 170085 6/6
5/- UCH42 8/6
5/6 UCL82 7/3
8/6
5/- UL41
6/8
10/9 UL84
516
91- UY85
7/- 5U4GB 8/8
6/3 5Y3GT 5/9/- 5Z4GT S/5/- 6L6GC 7/6
6/3 68N7GTB
8/8
914/9 6Y6GT 6/6
7/- 6%5GT 6/7/- 25LOGT 6/6
6/6 35L6GT 6/7/6 35Z5GT 5/6
5/- 50L6GT 6/6
10/-
P0084 6/PC089 11/7/8/6
7/8/6
10/- GET113 5/6/6 GET114 4/7/6 GET115 9/9/6 GET11612/8
6/6 NKT213 6/7/6 NKT216 7/8
8/6 NKT251 5/5/6 NKT255 6/6
6/6 NKT304 8/5/- NKT403
6/1716
16/- OAS
4/4/AD149 16/- 0A7
3/AD161 11/- 0A10
AD162 11/- 0A47
3/ADT14015/- 0A70
2/AF102 18/- 0A73
2/6
2/6
AF114 6/6 0A79
AF115 6/- 0A81
2/6
AC107
AC126
AC127
AC127Z
AC128
AC176
ACY17
ACY18
ACY19
ACY20
ACY21
AD140
OAZ210
OAZ211
OAZ212
OAZ213
OAZ222
OAZ242
OAZ245
6/6 0070
6/6 0071
0072
0073
0075
0076
416 0077
oAZ246 416 0078
OAZ247 4/6 0078D
OAZ290 9/8 0081
OAZ291 9/6 0081D
6/6
6/6
8/6
4/6
.
4/4/51-
7/8
61-
5/7/5/5/5/..
51-
OAZ292 9/6 0081M 5/0016 20/- OC81DM 510019
7/6 0081Z
9/-
0022
0033
0024
10/- 0082
6112/6 0082D 5117/6 0081
5/9/6 0084
610026
7/6 00122 15/3/- 0028 12/6 00129 7/6
AF116 6/6 OA85
4/- 0029 15/- 00140 9/6
AF117 51- 0A86
A1118 12/6 OA90
2/6 0015 12/6 00169 5/2/8
AF124 9/- OAK
0036 12/6 00170 5/3/6 0041
6/- 00171 6/AF125 8/6 OA95
AF126 8/- 0.0200 3/3 0042
5/- 00200 7/6
AF127 8/- OA202 4/3 0043
9/- 00201 11/6
5/- 00202 13/6
AF139 15/- OÁ210 7/8 0044
AF186 19/6 OÁ211 9/6 0044B 5/6 00203 10/6
AFY19 22/6 0ÁZ20011/- 0045
41- 00204 15/AFZ11 17/- OAZ20110/- 0045M 4/- 00205 15/AFZ12 12/6 0AZ202 8/8 0046
5/6 00206 22/6
7/6 ORP12 8/6
A8Y26 8/6 OAZ203 8/6 0047
16/- ORP60 5/ASY28 6/6 0ÁZ204 8/6 0057
ASZ20 7/6 OAZ205 8/6 0028 17/8 16202
416
GET20 10/- OAZ206 8/6 0059 1816 26012 201GET102 8/- OAZ207 9/6 0060 17/6 26012A251 GET103 4/6 0ÁZ208 6/8 0065 22/6 2E3013 20/GET105 8/6 0ÁZ209 8/6 0066
25/OC25
P. Et P. 2/- in £
1/- minimum
METAL WORK-PANELS-CHASSIS
For P.W. P.E. Constructional Projects
C.W.O. only
554
Radio Enthusiast
Transistors-Diodes-Zener
Valves
R.S.G.B. Amateur Radio Call Book, 1967 Edition
The latest edition of this best selling annual directory of Amateur Radio
Stations in the United Kingdom and the Republic of Ireland records more
than 3,000 changes since the 1966 edition.
98 pages, Price 6/- (By post 6/6)
Short Wave Listeners' Log Book
Specially designed for the Listener,
50 leaves
Spiral bound.
Price 5/6 (6/3 post paid)
A Guide to Amateur Radio
This publication will introduce the layman to Amateur Radio. A detailed
account is given in basic theory behind transmitters, receivers, aerials and
Amateur Licence conditions.
88 pages, Price 5/- (5/7 post paid)
Radio Amateur's Examination Manual
Student should be without this comprehensive book. It covers in
detail every aspect of the City and Guilds RAE examination and is the ideal
companion to anyone taking an RAE course.
No RAE
60 pages, Price
5/- (5/9 post paid)
Trade enquiries invited
Further details of other RSGB Publications, and
information about membership of the RSGB,
including a free copy of the monthly RSGB
Bulletin, may be obtained on request from the
Society:
RADIO SOCIETY of GREAT BRITAIN, Dept. P.W.
28 Little Russell St., London, W.C.1. HOLborn 7373, 2444
A top-quality record player amplifier. This amplifier
(was used in a 29 gn. record player) employs heavy
duty double wound mains transformer, ECC83, EL84,
Peak out-
put in excess
of 1/ watts.
All standard British
components.
Built on
printed circuit
panel, size 6 x 3in.
Generous size Driver and Output Transformers.
Output transformer tapped for 3 ohm and 15 ohm
speakers.
Transistors (GET 114 or 51 Muilard OC81D
and matched pair of 0081 o/p).
9 volt operation.
Everything supplied, wire, battery clips, solder, etc.
Comprehensive easy to follow instructions and
circuit diagram 1/6 (Free with Kit). All parts sold
separately.
SPECIAL PRICE 45/-. P. & P. 3/-.
Also ready built and tested, 5216. P. & P. 3/-.
A pair of TAls are ideal for stereo.
STEREO AMPLIFIER
Incorporating 2 ECL86s and 1 EZ80, heavy duty,
double wound mains transformer. Output 4 watts
per channel. Full tone and volume controls. Absolutely
complete.
EZ80 valves. Separate Bass, Treble and Volume controls
Complete with output transformer matched for 3 ohm
speaker. Size 7fn. w. x 21in. d. x 51in. h. Ready built
and tested. PRICE 69/6. P. & P. 4/9.
ALSO AVAILABLE mounted on board with output transformer and tin. speaker ready to fit into cabinet
below. PRICE 89/6. P. & P. 5/9.
QUALITY PORTABLE R/P CABINET
Uncut motor hoard. Will take above amplifier and
B.S.R. or GARRARD Autochanger or Single Record
Player Unit. Size 18 a 14 x 8_--in.
4 -SPEED
PLAYER
MATCHED PAIR AM/FM I.F.'s
UNIT
BARGAINS
All brand new in maker's original packing.
SINGLE PLAYERS
B.B.R. TU/12
£3.9.6
GARRARD SP25 De Luxe ..£12.10.6.
B.S.R. GL'7 with unit mounted pickup arm.
£4.18.8.
Carr. 5/6.
Carr. 5/6.
Carr. 5/6.
AUTO CHANGERS
ONLY
£4.19.6
BRAND NEW CARTRIDGE BARGAINS!
TRANSISTOR AND DIODE
SUPERHET
Printed
A first-class 2 waveband transistor superhet.
3 pre -aligned IF
circuit panel (size 81 x 21in.).
All
transformers.
High -gain Ferrite Rod Aerial.
aerial
winding.
PushFirst-grade transistors.
Car
pull output. All parts supplied with simple instructions.
All parts sold separately. Set of parts if purchased at one
time ONLY 24.5.0. P. & P. 2/6 (Circuit diagram 2/-.
Free with set of parte.)
35 OHM SPEAKERS
Suitable for use with above. 2in. Goodmans. Ideal replacement for most pocket portables, 8/8; 31in. 12/6;
7 x 4in., 21/-; P. & P. 2/ per speaker.
Portable CABINET
Size approx. 93 x 6- x 3,in. Suitable for above using
3t-in. speaker, 25/-. P. & P. 2/6.
COIL AND TRANSFORMER SET
FOR TRANSISTOR SUPERHET
ACOS GP67-1. Mono complete. List price 21/-.
prise 13/6. P. & P. 1/-.
Our
BRAND NEW 3 OHM LOUDSPEAKERS
5in., 12/8; 6hin., 15/-; 8in., 21/-; 10in., 25/-; 7fn. x
15/-; 10ín. x 6M., 26/-.
E.M.I. 8" x 5" with high flux ceramic magnet, 23/6.
E.M.I. 131 x ßin with high flux ceramic magnet, 42/(15 ohm, 45/-). P. & P. 5" 2/-, 61" & 8" 2/6, 10" & 12"
3/6 per speaker.
SPECIAL OFFER!
Limited number of 12in. 10 watt "RA." Speakers:
3 ohm 25/-; 15 ohm, 27/8. P. & P. 3/6.
TWEETERS. 2/" 3 ohm.
& P. 1/6.
BRAND NEW HEAVY DUTY 12in. SPEAKERS
Response 45 a/s-13 Kc/s. thin. voice coil. Available
in 3 or 15 ohms. Guaranteed full 15 watts British rating.
Heavy cast aluminium frame. There are current production by world famous maker and as they are offered
well below list price we are not permitted to disclose the
name. LIMITED NUMBER ONLY. UNREPEATABLE
at 89/6. P. & P. 5/-. Also 25 watt Guitar Model available
at £5.5.0. And 35 watt Guitar Model £8.8.0.
E.M.L
PLASTIC CONED
IF transformers one oscillator coil one driver transformer and wound Ferrite aerial (med. long and car
aerial coupling), 32/8 complete post 2/.. 6 transistor
printed circuit board to match 8/8. Post 1/-. Circuit
diagram 1/6 extra.
VYNAIR AND REXINE SPEAKER AND CABINET
FABRICS.
Approx. 54in. wide. Usually 35/- yard. OUR PRICE
13/6 per yard length. P. & P. 2/6 (min. one yd.) S.A.E.
for samples.
SPECIAL OFFER!
MINIATURE PRECISION AIR -SPACED TWO GANG
GENUINE HIGH QUALITY TYGAN FABRIC.
48ín. wide. Our price 10/- per foot run. P. & P. 1/6.
30/- per yard run. P. & P. 2/6.
BRAND NEW TRANSISTOR BARGAINS
SEMI SHROUDED DROP THRO' MAINS TRANSFORMER. Tapped pri 200/250 v. Sec. 300-0-300 v. at
110mA. and 6.3 v. at 3 amp. (E/S screen). Stack size
3/ x 3/ a l/in. 30/-. P. & P. 3/6.
MAINS TRANSFORMER. For Transistor power supplies.
Pri. 200/240v. Sec. 9-0-9v. at 500mA. 11/-. P. & P 2/6
TUNING CONDENSER. 178+176 p.F. size 11"w a id x
1á"h with vanes open. Built in trimmers 5/-. P. & P. 1/-.
GET 15 (Matched Pair) 15/-; V15/10p, 10/-; 0071
5/-; OC76 6/-; AF117 7/6.
Set of Mallard 6 transistors OC44, 2-0045 00810
matched pair 0081 25/-, ORP12 Cadmium Sulphide
Ce1110/6.
EDISWAN MAZDA
PXA101 6/S; XA103 6/6.
R.F.I. Pack: 1-PXA102 Mixer; 2-PXA101 I.F. Amp.
(Equiv. OC44 and 0045)
10/6
R.F. 2 Pack: 2-PXA101 Z.F. 1-PXA102 Osc.1PXA102 Mixer
12/6
L.F.6 Pack: Consisting of PXB113 Driver Matched pair.
PX171 mounted complete with heat sinks (Equiv.
and
0081)
12/6
0081D
ALL TRANSISTORS POST FREE.
TAPE DECKS
B.S.R. MONARDECK (Single speed) 3®in. per sec.,
simple control, uses 511n. spools, 26.15.0 plus 7/6 cary. and
ins. (Tapes extra).
LATEST COLLARO MAGNAVOX 363 TAPE DECK
DE LUXE. Three speeds, 2 track, takes up to lin. spools.
10 gas. Plus 7/6 Carr. & ins. on each (Tapes extra).
PORTABLE TAPE RECORDER CASE
Beautifully made and expensively finished in dark
grey heavy grade rexine. Satin Chrome metal grille
front and chrome fittings. Speaker aperture 9" x 4".
Overall size 151" w. x 15" d. x 71" h. Will take any
standard tape deck or single record player. Limited
number only. Worth at least £5, OUR PRICE 49/6.
P. & P. 5/-. Brand new and unused.
ACOS CRYSTAL MIKES. High imp. For desk or
hand
use. High sensitivity, 18/6. P. & P. 1/6.
TSL CRYSTAL STICK MIXE. Listed at 45/-. Our price
18/6. P. & F. 1/6.
Open all day Saturday
Early closing Wed. 1p.m.
eon
AfewminwlesfromSouth w'ant ala
Tube Station.
Comprising 1st S.F. and Snd I.F. discriminator (465ke/s
/10.7Mc/s). Size 1 x 1/ a 21in. high. Will match above
tuner head. 11/- pair. P. & P. 2/-.
SPECIAL PURCHASE! TURRET TUNERS
By famous maker. Brand new and unused. Complete
with PCC84 and PCFSO valves 34-38 Me/s IF. Biscuits
for Channel 1 to 5 and 8 and 9. Circuit diagram supplied.
ONLY 25/- each. P. & P. 3/9.
GORLER F.M. TUNER HEAD
88-100, Mc/s 10.7 Mc/s I.F., 15/-, plus 2/- P.
valve 8/6 extra).
3 -VALVE
WELL-KNOWN MAKERS SURPLUS!
ONE TRANSISTOR PRE -AMP
Suitable for use with Medium or High Impedance mikes.
guitars, gram pickups, tape decks etc; For operation from
200/300 volt H.T. rail or 9 volt battery. Gain approx 14:1.
Fully isolated input by Mu -Metal screened transformer.
Size 41" a 1' x P. Ready built complete with full circuit
diagram and instructions. ONLY 15/-. Post free.
Dual Purpose Bulk Tape Eraser and Tape Head Demagnetiser. 35/-. P. & P. 3/,
AUDIO AMPLIFIER
MODEL HA34
£4.5.0
HSL 'FOUR' AMPLIFIER KIT
A.C. Mains 200/250v., 4 watt, using ECC83, EL84, EZ80
valves.
,117
I ill
Heavy
duty double mains transformer
electrostatic screen.
Separate Bass, Treble
wound
with
;+oc°°.
and Volume controls, giving
fully variable boost and cut
with minimum insertion loss.
Heavy negative feedback
loop over 2 stages ensures high
output at excellent quality
Suitable for me with
with very low distortion factor.
Provision for
guitar, microphone or record player.
remotemounting of controls or direct on chassis. Chassis
size only Tin. wide x 4in. deep. Overall height 4in.
All components and valves are brand new.
Very
clear and conciseinstructionsenableeventheinexperienced
Supplied
amateur to construct with 100% success.
complete with valves, output transformer (3 ohms only),
screened lead, wire, nuts, bolts, solder, etc. (No extras to
buy.) PRICE 79/8. P. & P. 6/-.
Comprehensive circuit diagram, practical layout and
parts list 2/6 (free with kit).
This kit although similar in appearance to HA34 employs
entirely d/ermt and advanced circuitry.
- ----
I
10/14 WATT HI-FI AMPLIFIER KIT
Stylishly finmonaural
ished
amplifier with an
A
output of 14 watts
from 2 EL84s in
Super
push-pull.
o
reproduction
both music and
speech, with negligible hum. Sep
arate inputs for
mike and gram
allow records and
announcements to follow each other. Fully shrouded
section wound output transformer to match 3-150
speaker and 2 independent volume controls, and separate
bass and treble controls are provided giving good lift and
eut. Valve line-up 2 EL84s, ECC83, EF86, and EZ80
rectifier. Simple instruction booklet 1/6. (Free with
parts.) All parts sold separately. ONLY £7.9.6. P. & P.
8/6. Also available ready built and tested complete with
std. input sockets, £9.5.0. P. & P. 8/6.
Carrying case for above 28/6. P. & P. 7/6.
NEON A.C. MAINS INDICATOR. For panel mounting, cut
out size 11 x á x ;in. deep in terminal. White case with
lens giving brighter light. For mains 200/250v. 2/6 each.
P.P. 6d. (6 or more post free).
HARVERSON SURPLUS CO. LTD.
CHErrywood 3985
SEND STAMPED ADDRESSED ENVELOPE WITH ALL ENQUIRIES
170 HIGH ST., MERTON, S.W.19
P. (E0085
-
MAINS TRANSFORMER For transistor power supplies.
Tapped pri 200-250v. See. 40-0-40 at 1 amp (with
electrostatic screen) and 6.3v at .5 amp for dial lamps etc.
Drop thro mounting. Stack size 11" x 3á' x 31" 27/6.
P. & P. 4/6.
SMOOTHING CONDENSER. 2800 mid. 25v. 11" dia x 3"
high 3/-. P. & P. 1/-.
MATCHED PAIR OF 2h WATT TRANSISTOR DRIVER
AND OUTPUT TRANSFORMERS. Stack size 11 x 11 x sin
Output trans. tapped for 3 ohm and 15 ohm output.
10/- pair plus 2/- P. & P.
7-10 watt OUTPUT TRANSFORMERS to match pair of
ECL S6's in push-pull to 3 ohm output. ONLY 11/-.
P. & P. 2/6.
7-10 watt ULTRA LINEAR OUTPUT TRANSFORMERS
to match pair of ECL 82's in push-pull to 3 ohm output.
ONLY 15/-. P. & F. 2/6.
&
Designed for Hi-Fi reproduction of records. A.C.
Mains
operation.
Ready
built on plated heavy gauge
metal chassis, size Thin. w.
x 4in. d. a 41in. h. Incor.
rates ECC83, EL84, EZ80
valves. Heavy duty, double
wound mains transformer
and output transformer matched for 3 ohm speaker,
separate Bass, Treble and volume controls. Negative
feedback line. Output 4/ watts. Front panel can be
detached and leads extended for remote mounting of
controls.
The HA34 has been specially designed for us and our
quantity order enables us to offer them
complete with knobs, valves, etc., wired
and tested for only
P. & P. 6/..
Limited number 12/8 each. P.
:
3
Beautifully designed and
precision engineered by
Dormer and Wadsworth
Ltd. Supplied ready fitted
with twin .0005 tuning
condenser for AM connection. Prealigned FM section covers 86-102 Mc/s.
I.F. output 10.7 Me/s.
Complete with ECC85 (6L12) valve and full circuit diagram of tuner head. Another special bulk purchase
enables us to offer these at 27/6 each. P. & P. 3/-. Order
quickly! Limited number also available with precision
geared 3:1 reduction drive, 30/-. P. & P. 3/-.
Price £3.9.6. Carr. 7/6.
Latest B.S.R. UA25 Super slim
£8. 2.6
GARRARD 1000 with special Hi-Fi cartridge
£6.19.6
GARRARD AT6....£9,10.0. Carr. 6/6 on each.
All the above units are complete with t/o mono head
and sapphire styli or can be supplied with compatible
stereo head for 12/6 extra.
P. & P. 6/6
Super Deluxeversion
withECL86
valvesseparate bass, treble and balance
controls. Fullfeed back. 8 gus.
P. & P. 6/6.
6
SPECIAL HARVERSON OFFER!
FM/AM TUNER HEAD
QUALITY RECORD PLAYER AMPLIFIER
HIGH GAIN 4 TRANSISTOR
PRINTED CIRCUIT
AMPLIFIER KIT
Type TA1
(P/ease write clearly)
PLEASE NOTE: P. & P. CHARGES
QUOTED APPLY TO U.K. ONLY.
P. & P. ON OVERSEAS ORDERS
CHARGED EXTRA.
555
HI-FI AMPLIFIERS
20+20
GARRARD
STEREO
PLAYER
AT -60
AMP.
AA -22U
STEREO
AMP.
AMP.
MA -12
20+20W TRANSISTOR STEREO AMPLIFIER. Model AA 220. Outstanding performance and appearance. 5 stereo inputs
channel, 20 transistor, 10 diode circuit.
Assembled £57.10.0 (Cabinet £2.5.0 extra).
9+9W
10W
POWER
TRANSISTOR MIXER. MODEL TM -1. A must for the tape
enthusiast. Four channels. Battery operated. Similar styling to
Model AA -22U Amplifier. Kit £11.16.6. Assembled £16.17.6
each
RECORD PLAYERS
TUNERS
Kit £39.10.0
GARRARD AUTO/RECORD PLAYER. Model AT -60, less
cartridge £13.1.7. With Decca Deram pick-up £17.16.1 incl. P.T.
S-99
HI-FI MONO AMPLIFIER. Model MA -12. 10W output, wide freq.
range, low distortion. Use with control units. Models UMC-1 (Mono)
or USC -1 (Stereo).
Kit £12.18.0 Assembled £16.18.0
3+3W STEREO AMPLIFIER. Model S-33. An
cost unit. 2 inputs per channel.
Kit £13.7.6
easy -to -build, low
Assembled £18.18.0
DE LUXE STEREO AMPLIFIER. Model S-3314. De luxe version of
the S-33 with two-tone grey perspex panel, and high sensitivity necessary to accept the Decca Deram pick-up. Kit £15.17.6 Assembled £21.7.6
Many other Garrard models available, ask for Lists.
HI-FI STEREO AMPLIFIER. Model S-99. 9+9W output. Ganged
controls. Stereo/Mono gram, radio and tape inputs. Push-button selection. Printed circuit construction.
Kit £28.9.6 Assembled £38.9.6
HI-FI MONO AMPLIFIER. Model MA -5. A general purpose
5W Amplifier, with inputs for Gram., Radio. Modern functional
appearance.
Kit £11.9.6 Assembled £15.15.0
POWER SUPPLY UNIT. Model MGP-1. Input 100/120V, 200/250V,
40-60 c/s. Output 6.3V, 2.5A A.C. 200, 250, 270V, 120mA max. D.C.
Kit £5.12.6 Assembled £7.2.6
III
11111IIIIIIIIII1111111111111111111111IIIIIIIII
Make the most of your leisure time..
Hear the BBC Stereo FM Programmes
on the TRANSISTOR
STEREO FM TUNER
Elegantly designed to match the
Stereo Amplifier, AA -22U
Many special features including:Pre -assembled and aligned RF tuning unit.
4 stage IF amplifier, Automatic freq. control.
Printed circuit board, 14 transistor circuit.
Available in two units, sold separately, can be built for a
TOTAL PRICE KIT (STEREO) £24.18.0 incl. P.T.
Kit (MONO) £20.19.0 incl. P.T. can be converted to stereo with
adaptor, optional extra. Cabinet, optional extra £2.5.0. Send for
details.
PORTABLE
"OXFORD"
LUXURY
Model UXR-2. Specially designed for
use as a domestic or personal portable
receiver. Many features, including solid
leather case.
Kit £14.18.0 incl. P.T.
AUDIO SIGNAL GENERATOR.
111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
TRANSISTOR RADIOS
TRANSISTOR PORTABLE.
Model
UXR-1.
Pre -aligned I.F. transformers,
printed
Has
circuit.
Covers L.W.
and
M.W.
7" x 4" loudspeaker. Real hide case.
Kit £12.11.0 incl. P.T.
JUNIOR EXPERIMENTAL WORKSHOP
Model EW-1. More than a toyl WI
UXR-1
Our wide range includes:
3" LOW-PRICED SERVICE OSCILLOSCOPE. Model OS -2. Compact size 5" x
7á" x 12" deep. Wt. only 931b. "Y" bandwidth
2 c/s -3 Mc/s, +3dB Sensitivity 100mV/cm.
T/B 20 c/s -200 kc/s in four ranges, fitted mu metal CRT Shield. Modern functional styling.
Kit £23.18.0 Assembled £31.18.0
5"
GEN. -PURPOSE
OSCILLOSCOPE.
Model 10-12U. An outstanding model with
professional specification and styling. "Y"
bandwidth 3 c/s-4'5Mc/s 3dB. T/B 10c/s500 kc/s. Kit £35.17.6 Assembled £45.15.0
DE LUXE LARGE-SCALE VALVE VOLTMETER. Model IM -130. Circuit and specification based on the well-known model V -7A
but with many worth -while refinements. 6"
Ernest Turner meter. Unique gimbal bracket
allows operation of instrument in many positions. Modern styling.
Kit £18.18.0 Assembled £26.18.0
***
Oxford
TEST INSTRUMENTS
make over 20 exciting electronic devices,
incl.: Radios, Burglar Alarms, etc. 72
page Manual.
The ideal present!
Kit £7.13.6 incl. P.T.
HIGH PERFORMANCE CAR RADIO, CR -1. Superb LW/MW
entertainment, wherever you drive. For 12v pos. or neg. earth
systems. Tastefully styled to match any car colour scheme. Many
special features. Send for details. Kit (less speaker) £12.17.0.,
LIS £1.4.5 extra. Prices incl. P.T.
VVM, IM -13U
WHEN YOU ARE IN TOWN, WE HOPE YOU WILL VISIT US THERE
556
Model AG -9U.
10 c/s to 100 kc/s, switch selected. Distortion less than
0.1%, 10V sine wave output metered in volts and dB's.
Kit £23.15.0 Assembled £31.15.0
VALVE
VOLTMETER.
Model
V-7A.
7
voltage
ranges d.c. volts to 1,500. A.C. to 1,500 r.m.s. and 4,000
peak to peak. Resistance 0.1 SZ to 1,000M52 with internal
battery. D.C. input resistance 11M51.
dB measurement, has centre -zero scale. Complete with test prods,
leads and standardising battery.
Kit £13.18.6 Assembled £19.18.6
Model MM -1U. Ranges 0-1.5V to
1,500V a.c. and d.c.; 150µA to 15A d.c.; 0.20 to 20M O
44-" 50µA meter.
Kit £12.18.0
Assembled £18.11.6
R.F. SIGNAL GENERATOR. Model RF 1U. Up to 100 Mc/s fundamental and 200
Mc/s on harmonics. Up to 100mV putput.
Kit £13.18.0 Assembled £20.8.0
V -7A
MULTIMETER.
SINE/SQUARE
WELCOME TO OUR LONDON HEATHKIT CENTRE
233 Tottenham Court Road, W.1
We open MONDAY -SATURDAY 9 a.m.-5.30 p.m.
THURSDAY ..
..11 a.m.-2.30 p.m.
Telephone No: MUSEUM 7349
OS -2
GENERATOR.
RF -1U
Model
1G -82U. Freq. range 20 c/s -1 Mc/s in 5
bands less than 0.5% sine wave dist. less
than 0A5µ sec. sq. wave rise time.
Kit £25.15.0 Assembled £37.15.0
IG -820
TRANSISTOR
POWER
SUPPLY.
Model IP -20U. Up to 50V, 1.5A output.
Ideal for Laboratory use. Compact size.
Kit £35.8.0
Assembled £47.8.0
specifications subject to change
without notice
Prices
and
TAPE AMPLIFIERS
FM
TUNER
FM -4U
-
TAPE DECKS
STUDIOMATIC
DECK
-
CONTROL UNITS
AM/FM
TRUVOX
TUNER
DECK
HI-FI FM TUNER. Model FM -4U. Available in two units. R.F.
tuning unit (£2.15.0 incl. P.T.) with I.F. output of 10.7 Mc/s
and I.F. amplifier unit, with power supply and valves (£13.13.0).
For free standing or cabinet mounting.
Total Kit £16.8.0
(Multiplex adaptor available, as extra).
TRUVOX D-93 TAPE DECKS. High quality stereo/mono tape decks.
D93/2,1 track, £36.15.0 D93/4, track, £36.15.0
TAPE RECORDING/PLAYBACK AMPLIFIER.
Mono Model TA -1M
Kit £19.18.0 Assembled £28.18.0
Kit £25.10.0 Assembled £36.18.0
Stereo Model TA -1 S
MULTIPLEX ADAPTOR KIT, SD -1. Fully transistorised.
Self powered. Ideal for use with models FM -4U and AFM-1
Kit £8.10.0 Assembled £12.5.0
STUDIOMATIC "363" TAPE DECK. The finest buy
in its
price range. Operating speed: 1f", 3f" and 74" p.s. Two tracks,
'wow" and "flutter" not greater than 0.15% at 71" p.s. £13.10.0
With TA -1 M Tape Pre -amplifier kit £31.5.6
MONO CONTROL UNIT. Model UMC-1. Designed to work with
HI-FI AM/FM TUNER. Model AFM-1. Available in two units
which, for your convenience, are sold separately. Tuning heart
(AFM-T1-£4.13.6 incl. P.T.) and I.F. amplifier (AFM-A1£22.11.6). Printed circuit board, 8 valves. Covers L.W., M.W.,
Total Kit £27.5.0
S.W., and F.M. Built-in power supply.
(Multiplex adaptor available, as extra).
the MA -12 or similar amplifier requiring 0.25V or less for full output.
Kit £9.2.6 Assembled £14.2.6
5 inputs. Baxandall type controls.
STEREO CONTROL UNIT. Model USC -1. Push-button selection
accurately matched ganged controls to ±1dB. Rumble and variable low
Kit £19,19.0 Assembled £27.5.0
pass filters. Printed circuit boards.
Enjoy building a Heathkit model
"AMATEUR" EQUIPMENT
SPEAKER SYSTEMS
Model
HI-FI SPEAKER SYSTEM.
SSU-1. Ducted -port bass reflex cabinet
"in the white". Two speakers. Vertical
horizontal models with legs, Kit £12.12.0,
without legs, Kit £11.17.6 incl. P.T.
80-10m
DX-40U.
TRANSMITTER,
Power inputs 75W. C.W., 60W peak
CC phone.
Output 40W tp aerial.
Provision for VFO.
Kit £29.19.0 Assembled £41.8.0
SSB ADAPTOR, SB -10U
Kit £39.5.0 Assembled £54.18.0
The
BERKELEY
SLIM -LINE
finished
SYSTEM, fully
SPEAKER
walnut veneered cabinet for faster construction. Special 12" bass unit and
Range
4" mid/high frequency nnit.
30-17,000 c/s. Size 26" x 17" only 7á" deep.
SSU-1
AMATEUR
RECEIVER
Modern attractive styling. Excellent value.
Kit £19.10.0 Assembled £24.0.0
SYSTEMS.
160-10M TRANSMITTER. Model DX -
SPEAKER
1000. Careful design has achieved high
Completely
performance and stability.
self-contained.
RA -1
Kit £81.10.0 Assembled £106.15.0
COMMUNICATIONS TYPE RECEIVER. Model
RG -1. A high performance, low cost receiver for the
Frequency coverage: 600
discriminating listener.
kc/s-1.5 Mc/s and 1.7 Mc/s-32 Mc/s.
Kit £39.16.0 Assembled £53.0.0
Outstanding performance for price.
MPS: Size 36" x 16-i" x 14" deep.
Assembled £33.17.0
Kit £25.12.0
STANDARD: Size 26" x 23" x 14k" deep.
Assembled £33.17.0
Kit £25.12.0
111111IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIilllllllllll
HI-FI CABINETS
METER
and
SWR
POWER
REFLECTED
BRIDGE. Model HM -11U. Indicates reliably but
inexpensively, whether the RF power output of your
TX is being transferred efficiently to radiating
Kit £8.10.0 Assembled £10.15.0
antenna.
A wide range available including
cabinets
assembled
ready
kits,
or assembled and fully finished
cabinets, for example:
GLOUCESTER.
Kit £18.10.0 incl. P.T.
Kit £18.1,0 incl. P.T.
MALVERN.
CHEPSTOW. Kit £11.18.6 incl. P.T.
HM -11
U
OUTSTANDING "AMATEUR" EQUIPMENT
A wide range of American Amateur SSB equipments is now available in the U.K. Why not send
for full details of range, for example:
FILTER TYPE SSB TRANSCEIVERS
Models for 80, 40 or 20 metre bands.
Malvern
SEND FOR THE LATEST
FREE CATALOGUE
Deferred terms available in UK over £10
Prices quoted are Mail Order prices
Dept. P.W.-12
DAYSTROM LTD
DX -40U
all the Amateur
Bands from 160-10 metres. Many special
features,
including: half -lattice crystal
filter; 8 valves; signal strength "S"
meter; tuned R.F. Amp. stage.
Kit £39.6.6 Assembled £52.10.0
COTSWOLD
Berkeley
BANDS
Model RA -1. To cover
GLOUCESTER
Model HW-12 (80M) £67.10.0 Kit.
Model HW-22 (40M)1 £66.0.0 each kit.
Model HW-32 (20M)J'price inc. duty, etc.
1
Without obligation please send me
FREE BRITISH HEATHKIT CATALOGUE
FULL DETAILS OF MODEL(S)
80M Transceiver
HW-12
(Tick here)
D
1
(P/ease write in BLOCK CAPITALS)
I
NAME
ADDRESS
1
DEPT. P.W.12
111111111111111111111111111111111111111111111111111111111111III I I111111111111111111111111111111111111
557
FOR THE FINEST VALUE AND
TO HOME CONSTRUCTORS
LASIØ'S
CONSTRUCTORS BARGAINS
TRANSISTOR PORTABLES
SPECIAL PURCHASE-UHF/VHF TV TUNERS
We consider our Construction 'Parcels to be the finest value available on the home construction market. If on receipt you feel not competent to build the set, you may return it as
received within 7 days, when the sum paid will be refunded less postage.
Well known British makers surplus stocks. Now available for the first
time to the Home Constructor. Add 2/6 Post and Packing on each.
TRANSISTORISED UHF MINIATURE MODEL
Shielded metal case only 31 x 11. x Sin. Fully tunable-complete with
two AF139 transistors. LASKY'S PRICE 39/6
THE SKYROVER De Luxe
...-
transistor plus 2 diode superhet, 6 waveband portable receiver covering the full
Medium Waveband and Short Waveband
31-94H and also 4 separate switched band spread ranges, 13M., 16M., 19M., and 25M.,
with Band Spread Tuning for accurate
Station Selection. The coil pack and tuning
heart is completely factory assembled,
wired and tested. The remaining assembly
can be completed in under three hours from
our easy to follow, stage by stage instructions. Superhet, 470 He/a. All Mullard
Transistors and Diode. Uses 4 U2 batteries.
yT
5in. Ceramic Magnet P.M. Speaker. Easy to
read Dial Scale, 500 MW Output. Telescopic
Aerial and Ferrite Road Aerial. Tone
WAVEBAND
LONG
Circuit is incorporated, with separate Tone
COVERAGE IS NOW AVAILControl in addition to Volume Control.
Tuning Control and Waveband Selector.
ABLE FOR THE SKYROVER
In a wood cabinet, size 111 x 6; x 3in.
circuit
provides
additional
A simple
covered with a washable material, with
coverage of the 1100/1950M. band (inplastic trim and carrying handle. Car
cluding 1500M. Light programme). This
aerial socket fitted.
is in addition to all existing Medium
and Short wavebands. All necessary
19 6 Post
components with construction data.
á/ extra
be built for
Only 10/- extra Post Free.
deposit
and 11 monthly
H.P.
Terms:
45/for
receivers
This conversion is suitable
of
14/2.
Total
H.P.P.
£10.0.10
payments
that have already been constructed.
Four B2 batteries 3/4 extra.
Data 2/6 extra: Refunded if you purchase the parcel.
All components available separately.
VALVE UHF MODEL (illustrated)
7
In metal case size 4 s 6 x 11in. Fully tunable-complete with PC86 and
PC88 valves.
Without valves 12/6
LASKY'S PRICE 29/6
TRANSISTORISED VHF MODEL
*eQ
MAKER'S SURPLUS TELEVISION
*
c--
IF AMPERES
38 Mc/s. Contains a large number of components,
£8
SPECIAL PACKAGE BARGAIN OFFER!
Fees standing table cabinet, size
191 x 9 x
n., finished in medium
Mahogany. Scale marked 21 to 68
(UHF band). Designed to accept the
above IF Amplifier with space for a
Valve UHF Tuner.
Special Package Offer: IF Amplifier,
UHF Tuner with valves and Table Cabinet
TAPE RECORDERS
LASKY'S PACKAGE PRICE 89/6
Post
363 TAPE DECKS
speed model -11, 21, 71
ips, available with either 5 track or 1
track head. Features include: pause control; digital counter; fast forward and rewind; new 4 pole fully screened induction
motor, interlocking keys. Size of top plate
131 x Ilin. x 2/in. deep below unit plate.
For 200/250v. A.C. mains, 50 cps operation.
New, unused and fully guaranteed.
£10.10.0
£13.9.6
NEW MARTIN
TAPE
di
Packing 6/-
NEW-LASKY'S MINIATURE TRANSISTOR
3
Lasky's Price moäek
Lasky's Price medelk
IF trans-
formers, resistors, capacitors etc., and the following valves:
2 x PCF80, 1 x EB91, EF80, EF183 and EF184. Overall size
111 x 31 x 4in. deep. Ideal for servicemen and experimenters.
This IF amp. when used with the valve model UHF tuner
(above) provides a suitable conversion for BBC2.
No circuit available.
LASKY'S PRICE 39/6 Post 2/6
MAGNAVOX-COLLARO
The very latest
1
Miniature turret type fitted with 12 sets of coils and 3 Mullard AF102
transistors. In metal case size 4 x 2 x 31ín. LAS KY'S PRICE 29/6
TRANSISTORISED VHF MODEL 2
Sub -Miniature turret type fitted with 12 sets of coils and 3 Mullard AF102 transistors.
In metal case size 3 x 11 x 21in LASKY'S PRICE 37/6
AMPLIFIER MODULES
Incorporating the very latest circuitry to
provide high sensitivity and good quality
in conjunction with extreme small size and
compactness. High quality Newmarket
transistors used throughout. All designed
to operate on 9v. miniature battery.
Add 1/- on each for Post and Packing.
TYPE LRPC 1. 3 transistor. Input sens.
50mV, output 150mW, output imp. 40 0,
Carriage and Packing 7/6 extra.
2x1x/in.
RECORD/REPLAY
Now available from stock-for use with the Magnavox 363 Tape Deck.
LASKY'S PRICE £14.19.6 Carriage and
5 track model
LASKY'S PRICE £15.19.6 Packing 4/6 extra.
1 track model
panel
escutcheon
to take deck and amplifier controls.
Optional extra: Control
LASKY'S PRICE 12/6 Post & Packing 2/6.
PRICE 27/6
TYPE LRPC 2. 5 transistor. Input sens.
1mV, output 330mW, output imp. 150,
size 21 x 11 x/in
PRICE 22/6
TYPE LRPC 3. 5 transistor. Input sens. SmV, output 400mV, output imp.
AMPS.
.
21x11x/in.
TYPE LRPC 4.
21x11xlin
TYPE LRPC 5.
x14xlin.
5
120,
size
PRICE 25/ transistor, Input sens. 150mV, output 330mW, output imp. 150, size
PRICE 22/6
6 transistor. Input sens. SmV, output 2W, output imp. 312, size
PRICE 59/6
INTERNATIONAL TAPE
54
3in.
3in.
3in.
31in.
4in.
Special function modules-all one size 11 .1 x 11in. Complete with detailed function and
installation instructions. Send S.A.E. for specification sheets.
TYPE PA -1. Public address amp. for use with carbon, crystal or Dynamic microphones.
30 output imp
PRICE 30/ TYPE GR-1. Gramophone amp.-provides sufficient power to fill average room. 312
output imp
PRICE 30/ TYPE C0-1. Morse code practice oscillator-for use with morse key and 30 speaker.
5in.
5in.
bin.
bin.
bain.
Famous American Brand-Fully Guaranteed
51in. Long play, 1200 ft. Acetate 12 6
2 6
Message tape, 150ft
39 51in. Standard play, 850£t. PVC 116
Message tape, 225ft
51ín. Long play, 1200ft. Mylar .. 15 0
7 6
Message tape, 300ft
511n. Triple play, 2400ft. Mylar 45 0
10
0
Mylar
Triple play, 600ft.
7fn. Standard play, 1200ft. Acet. 12 6
17 6
Triple play, 900ft. Mylar
7in. Standard play, 1200ft. Mylar12 6
150
Double play, 1200ft. Mylar
19 6
7in. Long play, 1800ft. Mylar
10 0
Long play, 900ft. Acetate
7in. Double play, 2400ft. Mylar 25 0
8 6
Standard play, 600ft. PVC
350
7m. Long play, 1800ft. Acetate 150
Triple play, 1800ft. Mylar
226
7in. Triple play, 3600ft. Mylar 500
Double play, 1800ft. Mylar
P. it P. 1/- extra per reel. 4 reels and over Post Free
Full range of Philips prerecorded cassettes-send S.A.E. for list.
MICROPHONES
THE VERY LATEST MARVELS OF
ELECTRONIC MINIATURISATION
THE TTC MODEL B4002 FM WIRELESS
MICROPHONE
Highly sensitive-suitable for either static or mobile use. Signals
can be picked up by any FM radio or tuner which receives frequencies
between 96-104 Mc/s over several hundred yards. Size only 3 x 21
a lin. (in leather case). Operates in one PPS type battery. Complete
with neck cord, clip on dynamic extension mike (5 a 1 x srsin.l) and
LASKY'S PRICE 14 Gas. Post Free anywhere in world.
battery.
THE TTC MODEL 13/500. More powerful version of above-size 4 x 1 x lin. Operates
on one PP3 type battery. LASKY'S PRICE 16 Gns. Post Free anywhere in world.
FULLY ENCAPSULATED MODULES
PRICE
20/ -
TYPE MT -1. Metronome module-provides audible and visual beat from 30 to 240 beats
per minute (for use with 21L speaker or indicator lamp).
PRICE 22/6
GORIER UT 340 FM/VHF TUNING HEART
Permeability tuned-covering 87 to 108 Mc/s. For use with one ECC85 valve. In metal
case, size 3 x 211 x 11 in. Circuit supplied.
LASKY'S PRICE 15/11 Post 2/-. ECC85 valve 9/- extra.
TRANSISTORS
ALL BRAND NEW AND GUARANTEED
GET 51, GET 85, GET 56 2/6; 873A, 874P 3/6; 0C45, 0071, OC81D 4/6; 0044, 0070,
0076, 0081 516; (match pair 10/6); ÁF117, 0C200 6/6; 0042, OC43, 0073, OC82D 7/8;
00201, 00204 15/-; 0C205, 0C20619/6; 0C28 24/6; 0075 6/-.
T RAN S FI LTE R S by BRUSH CRYSTAL CO., Available from stook.
2 kc/s.
TO -01B 465 kc/s:
TO -02D 470 kc/s. in 1 kc/s.
9/6 each
TO -01D 470 ko/s. ± 2 kc/s:
TF -01B 465 kc/s. f 2 kc/s.
Post 6d.
TO -02B 465 kc/s. in 1 kc/s.
TF -01D 470 kc/s.
2 kc/s.
t
t
LASKY'S RADIO FOR FINEST VALUE and COURTEOUS SERVICE
558
SERVICE IN GREAT BRITAIN LASKYS
RADIO
AND HI-FI ENTHUSIASTS
SPECIAL INTEREST ITEMS!
RECORD PLAYERS
B.S.R.
SINCLAIR SUPER MINIATURE KITS
AUTOCHANGERS
AT LOWEST EVER PRICES
Brand new and fully guaranteedcomplete with cartridge and stylus.
ÚA14 4 speed mains model
ÚA16 4 speed mains model
LTA16 9v. battery model
UA20 4 speed main model
Add 5/- carriage and packing on each
GARRARD AUTOCHANGERS
PLAYERS
Auto -Slim Mono
AT6 Mono
AT6 Stereo
3000LM with stereo cartridge
AT60 with stereo cartridge
A70 less cartridge
A50 less cartridge
A1000 with GCS cartridge
A2000 with GCS cartridge
£9 19
SP25 Mono
SP25 Stereo
£9 9
£7 9
£10 9
£19 9
£9 14
£6 6
£6 6
£5.19.6
PR/CESw
SINGLE
£4 19
£8 19
£4. 9.6
£4.19.6
£5.19.6
SRP12 with cartridge
SRP10 Mains, with cartridge
SRP10 Battery, with cartridge
£10 19
£4 7
£4 19
£4 19
6
6
6
9
6
GARRARD BASES
WB1 £3 16 3 Clearview cover 23.10.0
WB2 £5 5 3 Clearview cover £4,17.6
Postage and Packing on all above 51-.
GREENCOAT RECORD PLAYER
r.p.m. 6v. Battery operated Comp. with pick-up and crystal cartridge.
size 7',xfifn.
LASKY'S PRICE 59/6 Post 2/6
Mil, and
45
èHE MICRO -6 miniature radio only 14/s x is/ro x lain.
THE SLIMLINE 2 -transistor pocket radio
THE MICRO -FM (tuner/receiver)
THE X-20 20 watt P.W.M. amplifier
Available ready built, tested and guaranteed
THE Z-12 12 watt amp. and pre -amp., fully built
STEREO 25 Pre -amplifier control molt, fully built
Write for details of
Package Deals
£5 19
£2 9
£5 19
£7 19
£9 19
£4 9
29 19
MARTIN HI-FI AUDIOKITS
Using specially developed circuits, the very latest transistors and printed circuits-these
kits are all fully checked and tested before leaving the factory.
LASKY'S PRICE £2/7/6
KIT 1. 5 stage Matching Input Selector Unit
LASKY'S PRICE £1/17/6
KIT 2. Pre -amplifier with volume control
KIT 8. 3 -Channel Mixer, with plug-in adaptors for individually
LASKY'S PRICE £3/19/6
matching each circuit. Adaptors 8/6 each
LASKY'S PRICE £3/2/6
KIT 4. Pre -amplifier with tone/volume control stages
LASKY'S PRICE 95/12/6
KIT 5. 10 and 3 watt Main Amplifier
LASKY'S PRICE £2/12/6
Unit
Power
supply
Converter
KIT 6.
LASKY'S PRICE £6/12/6
KIT 7. 15 ohm version of Kit 5
LASKY'S PRICE £2/15/ KIT 8. Power supply for Kit 7
LASKY'S PRICE 95/12/6
UNIT 15. FM Head
LASKY'S PRICE 95/7/6
*UNIT 16. IF Amplifier (FM)
LASKY'S PRICE 21/17/6
UNIT 17. Escutcheon, drive and controls (FM)
THE HARROW POWER PACK
Battery eliminator for portable radios, etc. Converte your Battery radio to A.C. mains
Replaces 41v., 6v. and 9v. batte. Size only 3 x 2 x 21in. State voltage required when
ordering.
LASKY'S PRICE 29/6
Post 2/-
Tel. PAD 3271
I42 TOTTENHAM CT. RD., LONDON, W.1
207 EDGWARE ROAD, LONDON, W.2
Tel. PAD 9789
118 EDGWARE ROAD, LONDON, W.2
152/3 FLEET STREET, LONDON, E.C.4
Tel. MUS 2605
33 TOTTENHAM CT. RD., LONDON, W.1
Both open all day Thursday. Early closing Saturday.
All the above branches open all day Saturday. Early closing Thursday.
Mail Orders and correspondence to 3-15 Cavell Street, Tow er Hamlets, London, E.1. Tel.: STEpney
Tel. LAN 2573
Tel. FLE 2833
Green 4821/2
LASKY'S FOR SPEEDY MAIL ORDER. SERVICE
`
FULL-TIME COLLEGE COURSE
IN RADIO AND TELEVISION
THE
Our Course, of sixteen months' duration, provides a fundamental
training for radio and television engineers. It includes theoretical
and practical instruction on transistor television receivers, U.H.F.
television receivers and colour television.
PEMBRIDGE
Exactly half the time is spent on practical work and the course
provides excellent practical experience on valve and transistor
radio receivers and high-fidelity equipment and all well known
makes of television receivers.
COLLEGE
The Course is recognised by the Radio Trades Examination Board
(R.T.E.B.) for the Radio and Television Servicing Certificate
OF ELECTRONICS
examinations.
Next Course commences 4th January, 1967.
FOR TRAINING
To:
The Pembridge College of Electronics (Dept. P11)
34a Hereford Road, London, W.2.
Please send, without obligation, details of the
Full-time Course in Radio and Television.
IN RADIO
Name
Address
AND TELEVISION
CMP 5
559
BSR MONARCH UA16
with FULL -FI HEAD
MULTIPLEX
4 -speed, plays 10 records, 12ín., 10in. or lin. at
16, 33, 45 or 78 r.p.m. Intermixes 7in., 10in., and
12in. records of the same speed. Has manual
play position: colour, brown. Dimensions: 121 a
105111. Space required above base board 4ein.
below
he dd 21ín. Fitted with F .9& P. 9/..rn
over crystal
Complete Amplifier Kit comprising E.C.L. 82 Maine transformer, metal rectifier,
volume control, smoothing condenser, metal chassis, speaker, etc.
To the purchasers of the above changer only 1916 plus 3/- P. & P.
.19.6
POCKET MULTI -METER
Size 35 a 25 a 15ín. Meter size 21 x 1=,in. Sensitivity 1,000
O.P.V. on both A.C. and D.C. volts. 0115, 0.150 0.1,000.
D.C. current 0.150mA. ReOistanee 0.100ku. Complete
with test prods, battery and full instructions, 42/6. P. & P
3/6. FREE GIFT for limited period only. 30 watt Electric
DECODER
for receiving
STEREO FM
Now is your chance to benefit in full from the new B.B.C. stereo transmissions
with our Multiplex Decoder. Design features: Highly efficient Mallard vinkor pot
cores. Two semi -conductor diodes. Double purpose valve. Printed circuit type
construction high input impedance. Specification: Cross talk minus 26 db at 1 kc/s.
Input requirements 0.5-1.5 RMS. Stability plus or minus 0.1%. Voltage requirements H.T. 190-250 volts. D.C. at 5 ma. heaters 6.3
volts. A.C. at 300 ma. Self powered unit shortly availPRICE
able, price to be announced. Size Sä a 31` a U. Fully
£4.4.0
built and tested.
Soldering Iron value 15/- to every purchaser of the Pocket
Multi -Meter.
"MAYFAIR"
P. Et P.
5 -Transistor
Type
TAPE RECORDER
Capstan-driven, battery operated 71 and 3e l.p.s.
Precision made. Push-button controls. High
quality 25m. speaker. Push-pull circuit. Output
400mW. Frequency response: 200.7,000 k/s.
Fast rewind. Up to 1 hour twin track playing
time. Automatic erasing for re-recording. Dimensions: 8in. a llin. a 33in. Weighs only 71b. Takes
Sin. spools.
plus 9/-. P.
&
MOTOR
Small A.C. mains motor 230/250 volts
complete with gearbox. 6 r.p.m. Price
15/- plus 4/.. P. & P.
Similar to above motor but without
gearbox. Price 9/6 plus 3/-. P. 2 P.
P.
40W FLUORESCENT LIGHT KIT
x 11in. a
51in.
7in.
3in.
5ein.
Incorporating GEC Choke size 81in.
FIRST QUALITY P.V.C. TAPE
Std. 850ft.
9/- 5in. L.P. 850ft. ..
..
Std. 1200ft.
11/6
L.P. 24000. .. 4/L.P. 1200ft. .. 11/6
lin. L.P. 1800ft. ,. 18/6
5ím. D.P. 1800ft. .. 18/6
P. & P. on each 1/6,
Lein., 2 bi--pin holders.
starter and starter-holder. P. & P. 5/6. 11/6
Similar to above: 80W. Fluorescent Light
Kit incorporating GEC choke size Min. a
rein. a leis. 2 bi -pin holders, P. & P.
17 LI
starter and starter holder. 6/6
Twin 40W Choke instant start for 2 a 2ft. tubes 17/8. P. & P. 5/6.
/6
POWER SUPPLY KIT
A.C. MAINS 200 25017
lin. T.P. 600ft.
5in. T.P. 1800ft.
..
..
lin. T.P. 3600ft. ,.
51in. T.P. 2400ft.
4
4in. T.P. 900ft.
or more post free.
,.
10/6
10/6
25/6
32(6
42/6
15/-
CYLDON
U.H.F. TUNER
MAGNAVOX COLLARO
Incorporating "C" core type mains
transformer, full wave metal rectification and smoothing condenser. Smooth
output 250 v. 250 ma and
613 v. 4 amp. for Heaters.
Completewith PC.88 and PC86
Valves. Full variable tuning.
New and unused. Size 41 x 51
11in. Complete with circuit
351_P.&P.
plus 3/6
diagram.
25/- P.&.
9/P6
\\ :
E
3/ -
MOTORISTS!
it's so easy to
Set of three Tape Deck Motors 240V.
A.C. Three motors 49/8. P. & P. 6/-.
SILICON RECTIFIERS
250 v. P.I.V. 750 milliamps. Six for 7/6.
post paid
build your own
'
COUNTER
REV
Fully Transistorised
OSCILLOSCOPE
for D.C.
£t
A.C. Applications
Push-pull X amplifier: Flyback suppression:
for only 1
9/6
Can be used for 4 or 6 cyl. engines. It would cost you at
least 8 to buy one new, at today's prices, but with a few
simple tools you can make one at a fraction of the price!
This kit makes a modern efficient rev -counter that is
essential to your engine's welfare: it contains moving
coil movement and all parts including transistors and a
circuit diagram. Maximum reading 8000 r.p.m. for 12 volt
operation negative or positive earth. Send for your kit
today, enclosing a P.O. 22/- which includes 2/6 postage
will save you 's and your engine.
-it
RADIO
ft
Internal Time-base Scan Wave form available for
external use: pulse output available for checking
TV line 0/P Transformers, etc. Provision for
external-I/P and
C.R.T. Brightness Modulation.
A.C. mains 200/250 v. 618/18/-. P. & P. 10/-.
elabari,
3
to
4 WATT
KIT
AMPLIFIER
x lin. Double wound
a
211n.
Comprising chassie 814n.
mains transformer output transformer. Volume and
tone controls, resistors, condensers, etc. 6V6, ECC81
and metal rectifier. Circuit 1/6 free with kit, 29/6 plus
5/6 P. & P. The above Amplifier built and tested, 10/6
extra.
T.V. COMPONENTS (ACTON) LTD.
21 B
HIGH STREET, ACTON, LONDON W.3
SHOP HOURS 9 a.m. to 6 p.m. EARLY CLOSING WEDNESDAY
All enquiries stamped addressed envelope. Terms C.W.O.
Goods not despatched outside U.K.
-560
2+" Speaker.
6 Transistors Superhet Output 200mw.
Plastic Cabinet in red, size 4+" x 3" x 18'
and gold speaker louvre.
Horizontal Tuning Scale.
Ferrite Rod Internal Aerial.
IF 470 Kc.
All components, Ferrite Rod and Tuning
Assembly mount on printed board.
Operated from PP3 Battery.
Full comprehensive instructions and
point-to-point wiring diagram.
Printed Circuit Board.
Tunable over medium and long waveband. Car aerial and ear piece socket.
PRICE
39'e
P. & P. 3/6.
Circuit diagram
Free with parts.
2/6.
INCLUDING CARRYING STRAP
oiiieioiiis
ezezezoré®!/x®!!10.4zwozebyz®Oezzovizeziwze
TRANSISTORISED
SIGNAL GENERATOR
A////!!!!!/!/!!!A/III!/!!!!!!!!!//A%YA!!!!!!!!/!!##
"ELEGANT SEVEN" MK
Size 54" x 3'-" x 1s". For IF and RF alignment and AF
output 700 c/s frequency coverage 460 Kc/s to 2 Mc/s
in switched frequencies. Ideal for alignment to our
Elegant Seven and Musette. Built
P. & P.
and tested.
V
39
7/6
Wfr
3/6reA
zwdrig.wiiiiiiiii/iiiiiiiisriiiiiil.
4.1.0i0iv
II
Buy yourself an easy to build 7 transistor radio and save at least £10.0.0. Now
you can build this superb 7 transistor superhet radio for under £4.10.0. No one
else can offer such a fantastic radio with so many de luxe star features.
De luxe grey wooden cabinet size 12," x 8f" x 3f".
Horizontal easy to read tuning scale printed grey with black letters, size
**
**
*
**
*
**
*
**
11;,,x2
High 'Q' ferrite rod aerial.
I.F. neutralization on each separate stage.
D.C. coupled push pull output stage with
separate A.C. negative feedback.
Room tilling output 350 mW.
Ready etched and drilled printed circuit
board back printed for fool proof con-
ONLY
Plus
£4.4.0
716 P. & P.
circuit diagram
struction.
Fully comprehensive instructions and point-to-point
wiring diagrams.
Car aerial socket.
Fully tunable over medium and long wave. 168-535 metres
and 1250-2000 metres.
All components ferrite
rod and tuning assembly mount on
printed board.
Full after sales service.
Parts list and circuit diagram 2s. 6d., free with parts.
Price £4.4.0 + 7s. 6d. postage and packing.
RADIO
Et
Parts List and
216
with
POWER SUPPLY KIT
To purchasers of 'Elegant Seven'
parts, incorporating mains transformer, rectifier and smoothing condenser, A.C. mains 200/250 volts.
Output 9v 100mA. 7s. 6d. extra.
SPECIAL OFFER For one month
only, R. £r A. 7" x 4" 9000 lines
P.M. Speaker at no extra charge.
TV COMPONENTS
21C HIGH STREET
FREE
parts.
ACTON
(ACTON)
LONDON
LTD
W.3
ALL ENQUIRIES STAMPED ADDRESSED ENVELOPE
GPENOODS
a.m.-6
NOT
p.m. INCLUDING
OUTSIDE U.K.
CLOSING WED.
TERMS C.W.O.
561
stern-c Iyne' ELECTRONIC CENTRES.
stern -dyne.
sivL. TQ4/
Solid State
Integrated Stereo
Amplifier
SPECIFICATION ít PERFORMANCE
The Stern -Clyne SULTAN represents
a considerable advance in solid-state, high
fidelity stereo amplifiers. Outstanding
performance is allied to meticulous construction, comprehensive facilities, installation simplicity, and attractive functional
styling.
SULTAN performance is a natural result of
superb design incorporating the most
advanced fully proved semi-conductors, and
modular substage construction that permits
searching quality control and precise
matching at every stage of assembly.
Particular attention has been given to the
provision of all the additional input, output,
and power take-off facilities ever likely to be
required. The compact sized, craftsman
finished teak cabinet and restrained styling
ensures unobtrusive, harmonious matching
with almost any decor.
® c
38 G nS .Complete. Carriage
&
Insurance
8/6
Power Supply
A.C. only. 200-250V, 50-60 e/s.
(Alternative ratings to special order)
Power Consumption 48 watts maximum.
Power Output
13 watts per channel RMS into 15
ohm load. Combined channels 20 w.
Speaker Matching 8-16 ohms (for 3-5 ohms use 2/3
ohm wire wound resistors in series
with each L/S.
Distortion
Total harmonic distortion less than
°25% at full output.
Frequency Response at 1 watt ± 2 dB, 30-25,000 eIs.
at 10 watts ± 3 dB, 40-15,000 c/s.
Cross Talk
Better than 50 dB at 1B Bols.
Hum and Noise
Better than 52 dB below full output.
Inputs; P.U.1. 8.5 mV. 47K ohms imped- RI.A.A.
once
P.17.2. 20 mV, 47K ohms imped- compen
sated
once
Radio100mV, 220K ohms impedance-Flat
Tape 100mV, 220K ohms impedance
Aux. 250mV, 430K ohms impedance
Aux. 250mV, 430K ohms impedance
Dimensions
13' x 11' x 53' Panel 12" x 4'
Bass Control Boost 14 dB at 40 Kc/s. Cut 15 dB at 40 Kell:.
Treble Control Boost 12 dB at 14 Kc/s. Cut 18 dB at 14 Ke/s.
PRICE BREAKTHROUGH
in NEW UNIVERSAL RECORDING TAPES
TENSILIZED-prestretehed, extra strong.
Pull frequency spectrum response.
Guaranteed playing times.
STERN-CLYNE make huge bulk purchases of recording
tapes from the world's biggest manufacturers-and hand
on the enormous price advantage to their customers.
The quality is unequalled: Tensilized to ensure the moat
permanent type of base. Highly resistant to breakage,
moisture, heat, cold or humidity. Highly polished,
splice -free finish.
Smooth output throughout entire
audio range. Ideal for your most treasured recordings.
TENSILIZED P.V.C.
3in.
250ft. Long Play
5in.
600ft. Standard
5in.
900ft. Long Play
5ein. 1,200ft. Long Play
lin. 1,200ft. Standard
lin. 1,800ft. Long Play
..
TENSILIZED POLYESTER
3*in. 600ft. Double Play ..
5in. 1,200ft. Double Play ..
5in. 1,800ft. Double Play ..
5in, 2,400ft. Triple Play ..
lin. 2,400ft. Double Play ..
lin. 3,600ft. Triple Play ..
With Garrard Autachanger, Solid State Amplifier, Free -Cone Speaker Systems
GNS.
SPECIFICATION
Power Supply 200/250 volts. 50 cycles AC (other standards to special order)
COMPLETE
Output (Amplifiers) 5 watts per channel
Carr.
Output Impedance 15 ohms (other speakers of 8 to 16 ohms may be used)
and
Frequency Response (Amplifiers) 30 c/s to 35 ke/s flat (2 dB) at 1 watt, tone
Ins.
controls level
Harmonic Distortion Less than 1
Hum and Noise -55 db below full output, tone
Balance Control
Ganged potentiometer; either
controls level
channel can be faded to zero without affecting the
other.
Cross talk between channels 48 dB at 1 ke/s.
Tape Record Outlets 200 mV average, each channel
Bass Compensation ± 15 dB at 40 e/s.
Dimensions-Player Unit 163 x 14 x 81 in. overall
Treble Compensation ± 15 dB at 14 he/s.
Loudspeakers 13 x 7 x 8 in. (each).
15/
ONLY FROM STERN-CLYNE
562
6
15
6
0
11
15
0
22
37
25
50
6
6
6
0
0
RECEIVER
l
.i___,
The Stern -Clyne Mercury is an important new approach to Hi-Fi sound reproduction in the home. One compact,
modular system embodies the latest advances in solid-state amplifier design. loudspeaker system miniaturization,
and pick-up cartridge development to provide superb stereo performance with exceptional installation facility.
Combined Player Unit/Amplifier Console and identical speaker systems are superbly housed in matching teak
veneer cabinets, specially designed to fit existing furniture or shelf apace, and match any decor.
MERCURY SYSTEM
AUTOCHANGER AND PICK-UP Garrard High-grade, Model 3000, specially equipped with high -compliance,
ceramic cartridge fitted with Diamond stylus to ensure superb, wide range reproduction, and extremely low
tracking weight.
AMPLIFIERS Identical, 5 -watt, 7 -transistor amplifiers designed round the latest, fully -proved semi -conductors.
Each is independently constructed on a modular circuit board and subjected to searching inspection and precise
matching at each stage of assembly.
LOUDSPEAKER SYSTEMS Bookshelf size, acoustically designed speaker system enclosures contain bass
speakers and matching high frequency units with crossover network. Specially developed bass speaker employs
enormously powerful magnet and free suspension cone to provide the full
blooded bass response usually associated with much larger units.
6
0
10
12
12
COMMUNICATIONS
\
MODULAR
HI-FI STEREO
6
5
8
.
CR150
-
j/
OF THE
PANTIYA
GROUP OF
COMPANIES
stern-cwns: TREMENDOUS
MERCUR
BRI LLIANTN
MEMBER
oarW.sa
-xo
----
£19.10.0
Carriage and Insurance 15/ Compact and attractive as a drawing -room radio
but packed with communications engineering
features to bring in the most distant stations loud
and clear. Continuous coverage from 540 Ko/s
to 30 Mc/s rakes in all broadcast bands, shipping,
world-wide short wave and Ham radio. Built-in
features include extra large tuning dial, extending
rod aerial, "S" meter, B.F.O., Noise Limiter, extra
quality loudspeaker, etc. Meticulously constructed,
handsomely finished. Essential for superb reception
but cheaper than many domestic radios. Size only
131 x 5 a 8 in. Standard mains operation.
MAIL ORDER
Et ALL ENQUIRIES
STERN-CLYNE DEPT. PW,
3-5 EDEN GROVE HOLLOWAY,
LONDON N.7 Tel. NORth 8161/5
TO
LONDON:
18 Tottenham Court Rd., W.I. MUS 5929/0095
23 Tottenham Court Rd., W.I. MUSeum 3451
309 Edgware Road, W.2,
PADdington 6963
109 Fleet Street, E.C.4.
FLEet Street 5812/3
162 Holloway Road, N.7
NORth 7941
9 Camberwell Church St., S.E.5. RODney 2875
220 Edgware Road, W.2.
PADdington 5607
CROYDON:
12 Suffolk House, George St. MUNicipal 3250
BRISTOL:
26 Merchant Street, Bristol 1.
Bristol 20261
LIVERPOOL: 52 Lord Street.
Royal 7450
MANCHESTER:
20/22 Withy Grove, Manchester 4.
Blackfriars 5379/5246
SHEFFIELD: 125 The Moor. Sheffield 29993
NOTTINGHAM:
Eastown House, Lincoln St. Nottingham 45889
PRACTICAL
VOL
42
No 8
issue 718
WIRELESS
DECEMBER
1966
TOPIC OF THE MONTH
Who's for Hertz?
AD, Sir! Let's send a gunboat down the Rhine and
those followers of Heinrich Rudolph
Hertz! How dare they threaten our homely c/s!
The term Hertz (Hz), used in Europe as the unit of
frequency, has lately been promoted for more widespread acceptance. The situation at the moment, if
you'll pardon the expression, is flux. The British
technical press is divided, as is that of America, but the
amateur radio movement and press appear to favour
the older terminology.
There is little guidance from officialdom. The British
Standards Institute have made no proclamation, nor
have the ITU Radio Regulations been amended. No
doubt future committees will sit and-as seems likely
-declare for conversion to Hz.
Reasons for the change are (a) to tie in with Continental nomenclature and (b) to honour the name of
Hertz. Standardisation is usually desirable in technical
fields but with the prospect of decimal coinage, mm
for inches, gm for those fine old English lbs, CCIR
standards for u.h.f. TV, etc., some patriots feel that
things have gone far enough. They wonder if, one day,
the M1 will be renamed Autobahn 1, Scotland Yard
becomes the Surette, "Practical Wireless" will cost
12 Swiss francs and London is known as Londres, in
the interests of unification.
As for perpetuating the name of Hertz, why stop
there? Casting around in radio's past will land a
healthy catch of other worthy but unsung heroes.
Why not start again and concoct an entirely new set
of technical units to satisfy all national honours?
There are also many untapped areas for new units.
Instead of expressing Wow, Flutter and Distortion as
percentages we could devise a scale of units, to be
called respectively, say, Dollys, Littlewoods and
Beatles. The possibilities are boundless.
As for changing c/s to Hz, this seems to be utterly
unnecessary. "Cycles per second" is an exact specification, whereas Hertz is meaningless without qualification. One might as well abolish the gramophone
disc r.p.m. for "Berliners", i/s of tape speed for
"Pfleumers" and m.p.h. for "Fords".
So for the moment we are sticking to old-fashioned
c/s-at least until a change seems universally
acceptable or until the Electricity Boards begin
W. N. STEVENS, Editor
supplying 50Hz mains!
usubdue
NEWS AND COMMENT
Leader
News and Comment
563
564, 588
Practically Wireless
by Henry
On the Short Waves
by John Guttridge and David
Gibson, G3JDG
New Books
Club Spot-British Amateur
Electronics Club
570
593
597
610
CONSTRUCTIONAL
5 -Band T.R.F.
byF. G. Rayer, G3OGR
Home Intercom Unit
by D. Wilson and J. W. Robson
Microphone Stand for the
Grundig GDM
by A. D. Cardwell
Making Sub -Miniature Relays
by I. J. Kampel
"0" Multiplier for the 81155
by
C.
Molloy
566
568
576
579
581
P.A. Preamplifier
by L. McNamara
598
Modifying the Electronic Gate
by A. K. Samways
609
GENERAL ARTICLES
Getting Your Ticket
by Alan Ford, G3U/V
571
Stereo Programmes
by K. Royal
Medium Wave DX Listing
JANUARY
ISSUE
WILL
BE
584
602
PUBLISHED
ON
DECEMBER 8th
be addressed to : The Editor, "Practical Wireless", George Newnes Ltd., Tower House, Southampton Street,
London, W.C.2. Phone: TEMple Bar 4363. Telegrams: Newnes Rand London. Subscription rates, Including postage: 36s. per year to any part of the world. © George
Newnes Ltd., 1966. Copyright in all drawings, photographs and articles published in "Practical Wireless" is specifically reserved throughout the countries signatory
to the Berne Convention and the U.S.A. Reproductions or Imitations of any of these are therefore expressly forbidden.
All correspondence Intended for the Editor should
563
Lafayette Receivers
I THINK your readers should be made
aware how difficult it is to obtain spares
for some of the American built receivers
that are extensively advertised and sold
in this country.
I purchased an H.E.30 communications receiver some time ago and
recently wanted one or two parts which
are special to the receiver. I have
written twice to the Lafayette Radio
Corporation, in New York, asking for
the name of a spares supplier in this
country, without success.
It is thus assumed that no spares
facilities exist in this country (having
not received a reply to either of my
letters) and that one has to obtain them
direct from the States. From my
experience in trying to obtain a manual
for this receiver (costing approximately
for postage and
14s.
plus
10s.
insurance), it is obvious to me that the
purchase of any foreign, set is an
uneconomical proposition.
My receiver remains silent.
Weybridge, Surrey.
H. C. Pryse.
Short Wave Receiver
BEING interested in S.W.L. for some time,
I decided to build the "valve -base coil"
short wave receiver (P.W. July 65) and
found it necessary to have a twin gang
300 + 300 p.F. tuning capacitor using
one gang as described in the text and the
other gang with a coil of the same number
of turns used in Ll across it with the aerial
side of it going to pin 2 of V 1.
I would like to hear from other readers
who have built this set, and whether they
had to do the same.
8 Bircham View,
P. Blanchard.
Goosewell Hill,
Eggbuckland,
Plymouth.
NEWS AND ..
NEW CORRESPONDENCE CENTRE
The Aldermaston Court Centre for Adult Education was officially opened
recently by Sir Arnold Lindley, Chairman of the Engineering Training
Board. This historic place now houses the modern and efficient
machinery for providing correspondence courses varying from the ever
and `"A" levels up to and including degree level. In
popular G.C.E.
fact 1,000 different courses are currently available.
The intake of the centre now tops twenty thousand a year, and over
2,000 letters and enquiries are answered every week. This is by no means
restricted to Britain, and overseas lessons are shipped out at a rate of
five tons per month.
This correspondence college embraces many of the well-known
names: The British Institute of Engineering Technology; School of
Careers; Press Art School, to name just a few.
There is no doubt that all these colleges, which come within the
Cleaver -Hume Group, are extremely capable and well -organised.
One room at the centre contains some three million lessons ready
printed and our guide explained that these were "kept warm" to avoid
any suspicion of paper deterioration.
The preparation of a course is a specialised business. First a panel of
consultants is formed to prepare the syllabus. Once this is agreed,
experts are approached to select text books, prepare lessons complete
with test questions and model answers. The proposed course is then
vetted and edited by experts in correspondence tuition. When the consultant panel is satisfied completely, the lessons and model answers are
prepared for printing.
One of the courses examined at random was "Technical Mathematics", the subject-logarithms. The style and presentation was clear
and lucid, but perhaps the most pleasing thing was the number of
examples given; fifteen in fact. In the majority of text books only a
couple of worked examples are included followed by numerous test
questions.
£1.1 M AUTOMATIC WEATHER SYSTEM ORDER
The Marconi Company is to supply the Royal Swedish Air Force
with an automatic meteorological system to process weather
information received from ground stations, weather ships and
weather satellites. The system is scheduled to be in operation
by 1969.
-
POCKET RADIO WITH INTEGRATED CIRCUIT
of integrated design. In fact all the components
(9 transistors 4 diodes 14 resistors and several inductors) are incorporated in a small silicon chip measuring 1.5mm. x 2.25mm. The overall
dimensions of the receiver are: 1.25 x 2.3 x 0.7ín.; weight is 105gm.
Maximum audio output is quoted as 70mW. The address of Sony U.K.
Sales is 70-72 Welbeck Street London, W.1. (Tel. WELbeck 3546).
This small Sony radio is
Converting the R1392
WITH reference to my article in the
November issue page 502, I notice three
errors.
Line 7 first paragraph should read
f signal-I.F. Mc/s.
In Fig.2
f xtal=
18
the power supply lead marked "H.T.+ve
." etc., should read
to pin 9
"H.T.-ve to pin . . ." etc., although
anyone looking at the circuit will realise
that the lower H.T.A-ve should read
H.T.-ve. Also in Fig. 2, R5 should be
in series with V2 (0A2).
Devon.
C. G. Elliott, G8ADP.
564
The integrated Circuit used in this receiver, has 9 transistors, 4
diodes, 14 resistors, and the size is .1 .5 mm. X 2.25 mm.
Regenerative Rejuvenation
...COMMENT
B.S.R. WINS GOLD MEDAL AT LEIPZIG FAIR:B.S.R. Ltd. of Old Hill, Staffordshire, won a Gold Medal for the
UA50 Mini -Changer which is claimed to be the smallest
portable record changer in the world.
Altogether, 53 Gold Medals and Diplomas were awarded at
this Fair. Nearly 300 firms from 25 countries submitted products
for examination by scientific and technical experts.
NEW MODELS FROM HEATHKIT
Two new kits are announced by Daystrom Ltd. in their Heathkit range.
Model CR -1 is a high performance car radio covering m.w. and /.w.
available as a kit for £12.17.0 (loudspeaker extra).
Model SD -1 is a welcome addition to the range. It is a transistor f.m.
stereo decoder which although designed for use with the existing
Heathkit tuners can also be used with most other f.m. tuners with
facilities for multiplex output. The kit, complete with built-in power
pack costs £8.10.0.
SPIRALUX TOOLS
The new 48 -page catalogue of Spiralux hand tools contains
details of many items used by radio constructors. Copies may
be obtained on application to Hollands Er Blair Ltd., Bensham
Grove, Thornton Heath, Surrey.
MICROELECTRONIC COMPUTER
FROM time to time letters are published
in these columns criticising the superregenerative receiver. This is a great
pity, since properly built and operated
super-regen's take a lot of beating.
I am also pleased to see that interest
has been aroused in the v.h.f. and u.h.f.
bands. Now perhaps we shall see more
of these interesting receivers. It is true
that they have rather a wide bandwidth,
but this is obviously an advantage at
v.h.f. and u.h.f.
As far as I can see, the f.m. detection
of a super -regen is as good as found in
commercial receivers, which require a
sweep -generator for alignment if distortion is to be avoided. With the super-
regenerative receiver, the operator is
able to realign as he pleases with his
single tuning control.
If really high quality is wanted with
economy, then the quenching of the
oscillator should be sinusoidal. This
does mean that another valve or transistor is needed, plus a few resistors,
capacitors, an r.f. choke and a quenching
transformer. Even then, the total cost is
well below a conventional f.m. receiver.
Recently, I had occasion to replace
a complicated v.h.f. receiver I had built
for satellite listening. I knocked -up a
super -regen and was pleasantly surprised
with the results. It was not so noisy as
the superhet, yet was just as sensitive
and a lot smaller.
I venture to predict, Sir, that we shall
be seeing in the not too far distant
future, a line-up something like this:
grounded -grid (or base) r.f. amplifier mixer, local oscillator, super -regenerative
self-quenching detector (operating on the
difference frequency), followed by the
usual audio stages. For amateur use, the
added complexity of automatic gain
stabilization can be dispensed with.
Hugh A. L. Wagner.
Kuala Lumpur.
Surplus not Junk
The photograph shows the new Marconi Myriad //, claimed to be one of
the world's most powerful microminiature machines. It is a simpler
version of the original Myriad, the first commercially available integrated
circuit computer. Over 20 million orders per minute can be handled in
this parallel computer which uses a 24 -bit word and single address
form order code.
BBC ENTER DISC MARKET
The BBC is to market its own disc records under the label of
BBC Radio Enterprises. The records will utilise the BBC
archives for material and will probably be along the same lines
as the records of BBC programmes issued by Pye, Decca and
E.M.I., an arrangement which will continue. This is another
venture designed to raise revenue for the BBC; its sister
division, BBC Television Enterprises, has been bringing in
between
£1
M-£2M annually.
I WAS rather surprised to read your
Club Spot feature on the Luton & District Amateur Radio Club that the
seller of the i.f. strips was termed a
junk dealer.
I would like to state that my Surplus Radio Components Business in
Luton has a large selection of components, and that in the space of two
years we have built up a reputation
that we are very proud of.
George Hannington.
Luton, Beds.
More News and Comment on Page 588
565
band
TRF R
FG RAYER
G
FOR a t.r.f. receiver to be successful it must be
possible to control reaction smoothly and
efficiently. Tuning should also be easy, and
the whole construction rigid. These points are
satisfactory in the receiver described here, and very
good results may be obtained.
Figure 1 on the blueprint shows the circuit. Readymade Denco green type plug-in coils are used and
the following ranges are available:
150-500kc/s
515-1,545kc/s
1.67-5.3Mc/s
3
4 5.0-15Mc/s
5 10.5-31.5Mc/s
Ranges 2, 3 and 4 are the
1
2
2000-750m.
580-194m.
180-57m.
60-20m.
28-9.5m.
most suitable, giving
coverage from 580-20 metres. VC2 is for medium
wave tuning, or short wave bandsetting, while VC3,
operated by a ball drive, is for s.w. tuning, or band spreading. This arrangement is very helpful in the
congested s.w. bands.
VRi allows the screen grid voltage of VI to be
adjusted for best regeneration, which is controlled
by the 15pF capacitor VC1. When long range
reception is not achieved with a t.r.f. receiver, this
is usually because regeneration is not properly
controlled. A little care is necessary in this direction,
but the presence of VR1 and the small size of VC1
does allow excellent reaction. The 6BR7 is a high
gain, low microphony valve very suitable for
detector.
The two sections of a 12AT7 are used as audio
amplifier and output stages. Reception is often
satisfactory with a loudspeaker, but 'phones are
obviously more suitable for DX work. VR2 is the
audio gain control. A small transformer T2 and
I
BLUEPRINT SIDE ONE
a pair contact cooled rectifiers provide h.t., which is
smoothed by C10/Ch/C9.
An attempt was made to measure sensitivity with
a laboratory type signal generator, a difficult exercise
with a t.r.f. receiver. Tests were made on 10Mc/s.
With VC1 fully open and VR1 adjusted for
maximum gain, an input of 2000/ at the aerial
terminal produced an output just audible in the
With VCI rotated for maximum
loudspeaker.
sensitivity, an input of 1µV produced an output just
audible.
566
Chassis and Panel
Dimensions of the chassis and positions of major
components can be taken from Fig. 2 on the
blueprint. A Qin. diameter punch is most satisfactory
for the valveholders and coil holder. These are
fixed with 6BA bolts, with tags under the nuts.
Trimmer Tl has its lugs through a strip of paxolin,
supported by a bracket.
The panel used in the prototype was made of
hardboard, painted, and backed by sheet aluminium,
but aluminium alone would do. This and the side
brackets can be purchased ready cut if preferred.
The panel is bolted to the brackets and chassis.
A large hole is needed for the ball drive, and its
lug is bolted to the panel. If the drive and VC3
are fitted carefully, the flexible coupling could be
omitted. This coupling takes up any slight misalignment, but for smooth tuning VC3 should be
as near in line with the drive as possible.
Leads from VR1 pass through an adjacent hole,
and may be coloured for easy identification. This
is also so with VR2; take separate well -insulated
leads from the switch (VR2) through the chassis to
the primary of T2, and mains.
A non -skirted holder is most suitable for the coils.
The use of screening cans on Vl and V2 is optional.
Under the Chassis
Figure 3 on the blueprint shows wiring and
components under the chassis. Leads to VC1, VC2,
VC3, VI and the coil holder should be as short and
direct as possible. All connections can be in
20 s.w.g. tinned copper wire, with insulated sleeving.
A tag strip near T2 anchors switch, mains and
T2 primary leads. Tag i is a junction for switch
and primary wires. Tag 2 holds the mains red (L)
lead and the second switch connection. Tag 3 is a
junction point for the mains black (N) lead and
transformer primary.
When wiring is completed as in Fig. 3, the output
transformer T1 can be bolted to the side runner.
Its primary is connected to h.t. positive at R6 and
tag 6 of V2. Leads from the secondary run to the
panel jack socket.
The -wires from C5, VR2 and R8 are close against
the chassis. So are the 6.3V heater connections.
C6 is directly from tag 1 to tag 7. If audio oscillation
begins with VR2 near maximum gain, this should
be checked. Wiring should otherwise be perfectly
straightforward, from Figs. 2 and 3.
Notes on Components
Changes are possible with no loss of efficiency,
and this may allow items on hand to be used. Any
trimmer, small variable capacitor, or pre-set
capacitor should do for TC1, though it must, of
course, be insulated from the chassis.
Though VC1 and VC3 are 15pF, values from
10pF to 2SpF will be found satisfactory. VC3
should not be too large or tuning will be less easy,
but some plates can be taken off larger capacitors.
VC2 can be 250pF, 300pF or similar. The smaller
values will reduce the band coverage, especially for
medium waves. Should some other type of drive
be available, it can be fitted to VC3.
Resistor values are not very critical. Rl could
be 68k1/ to 150k1-1. R3 and R6 may be about 200kû
to 270kû. VR2 could. be 500kû. The coupling and
by-pass capacitors can also be changed somewhat in
value without spoiling results.
The anode current of the output stage is small,
and the type of speaker matching transformer
originally intended for small battery operated.
pentodes will do well. The power output of this
stage is similar to that of the output pentodes once
used in battery portables (about 250mW).
If to hand, a larger transformer could be used
for T2, but a bigger chassis, with the transformer
on top, might be necessary. If the transformer is
intended for use with a valve rectifier, and the valve
is also to hand, it can replace RI and R2. Provided
an h.t. supply of around 250V is available, the actual
components employed will not be important.
Speaker/°Phones
The output jack is for a speaker, or headphones.
There is some mismatch when using 'phones, but
this is quite usual, and not too important. 'Phones
of quite low impedance are most suitable.
If a high -impedance headset is to hand, a jack
for this purpose can be connected to the receiver
chassis. Take the second jack contact to a 0.01µF
mica capacitor, wired to tag 6 of V2.
Receiver Tuning
The results obtained depend very much on correct
adjustment of VC1 and VR1. These are not volume
controls and cannot be simply turned to maximum
and left.
With an average aerial, Ti can probably be about
half closed. Set VC1 about two-thirds closed, and
rotate VR1 to increase VI screen grid voltage from
zero, until oscillation is heard when tuning through
a transmission. If VR1 is not turned far enough, no
reaction may be obtained. Turning VR1 too far
will make reaction violent and difficult to adjust by
means of VCI. With VR1 in a suitable position, a
smooth build-up of sensitivity should be possible
with VC1.
Adjust VC1 critically while tuning with VC3.
nG?e.
.or VRi
Fig. 4: Dimensional data for the front panel. If one
does not have a cutter large enough to tackle the hole for
VC3, drill a lot of smaller holes just inside its circumference, then break away the unwanted metal and finish the
job off with a file.
After changing coils, or moving VC2, VR1 may
have to be re -set. This is actually quite easy, but
note that if VR1 is turned past a certain point,
sensitivity begins to fall off, even if reaction can
still be obtained.
VC2 is used to locate the required band, and this
is tuned with VC3. Should Ti be set at too high a
capacitance for the aerial used, reaction may be lost
on some frequencies, especially with the smaller coils.
VR2 is a conventional audio gain control.
If possible,. provide an earth on the receiver.
However, this depends on the location, and other
factors. Mains current can be drawn from a plug
fitted with the smallest available fuse, such as 1A.
If instability arises, especially at maximum audio
gain, keep the aerial lead away from the receiver,
and especially phone or speaker connections. Small
capacitors (about 100pF) may be wired from tags 2
and 7 of V2 to chassis. Alternatively, stopper resistors of about 100kû each may be placed in the connections to tags 2 and 7, immediately at the holder.
The possibility of such instability depends to some
extent on actual wiring.
Band coverage with each coil depends somewhat
on the position of the core, movement of which also
has some influence on regeneration. Initially, the
cores may be set with about +in. of brass thread
clear, and this can be adjusted later if necessary.
The cores are locked with 6BA nuts, to retain tuning
calibration.
.
Try 80 Metre Band
Many transmissions should be heard at any hour,
but the most suitable bands depend on the time of
day and other factors. If. a start is being made in
amateur band reception, then 80m will furnish many
stations, especially at week-ends. The 20m band
will usually be most suitable for long distance
amateur signals. Very many broadcast stations will
be heard around 19, 25, 31, 41 and 49 metres.
When maximum selectivity is required (as on the
medium wave band) volume should be reduced as
necessary by TC1 and VR2, so that regeneration can
be increased. Good performance is then possible.
SEE BLUEPRINT FOR OTHER DRAWINGS AND COMPONENTS LIST
567
HOME
INTERCOM
UNIT
By D. W LSON & J.W. ROBSON
I
THIS unit uses sound-powered handsets, and
embodies a small transistor amplifier at each
station. Each amplifier may be built for less
than five shillings, and the resulting power is at
least as good as that available on the GPO system,
without the tonal quality deteriorating.
Figure 1 (see Blueprint) shows the circuit diagram.
The transmitter of the handset feeds via the blocking
capacitor into the base of the transistor, which
operates in the "common emitter" mode. The receiver
of the handset acts as a collector load, and the audio
output is fed via the line S" (which includes a
0.5µF capacitor to prevent the paralleling of the
collectors of the two amplifiers), to the receiver of
the other station, and thence via its battery to return
along the "C" line. The power for the amplifier is
taken from a 4.5V battery, which is used for calling.
Amplifier
This is built around a cheap "red spot" transistor
as advertised in "PW" at ls. each which together
with the base resistor and blocking capacitor is
mounted on a piece of 1/16in. thick paxolin 11 X
2-jin. in such a way that an imitation printedcircuit results. Four flexible "tails" serve to connect
the amplifier to the remainder of the equipment.
Constructional details are shown in Fig. 2.
Calling System
Calling is via a third line "R," the current returning via the line "C". Any small bell or buzzer of
3 volt rating will be satisfactory over lines of
moderate loop -resistance (say not more than 1512)
though in the author's case special arrangements had
to be made, using relays to accommodate a loop
resistance of 5012_
BLUEPRINT SIDE TWO
The pulsating nature of the current taken by a
bell or buzzer will give rise to voltage pulses in the
impedance of the "C" line, and as this impedance is
common to the speech circuit, the pulses will produce a rasping sound in the caller's receiver to
indicate that the bell at the other station is ringing.
Since in the author's case the "C" line did not carry
the bell current, it is not possible to state the loudness of this sound, but if it proves to be excessive
it may be attenuated by shunting a large low-voltage
electrolytic capacitor across each bell.
568
The "call" switch is of the single -pole change -over
type, spring-biassed to one position. A neat switch
may be cheaply made from a "VETO" flush two-way
switch available from Woolworths, if the mechanism
is modified so that the locating spring does not pass
over dead centre. Access to the mechanism is
obtained by first removing the two tapered square headed screws securing the ceramic to the rear of
the moulded front -plate. If the pinching screw is
then removed from the centre terminal a small screw
will be found inside, which if removed, will allow
the mechanism to be withdrawn. By careful use of
a miniature hacksaw the lug to which the locating
spring is attached may be lengthened sufficiently to
ensure that the line of the spring always remains
to the front of the rocker fulcrum. No matter how
the rocker is then moved it will always return to
the one position upon release. Reassembly should
be such that the lower portion of the rocker
protrudes in the "free" condition. See Fig. 3.
Case
This may be made from wood, plastic or metal
in any shape or form to suit the individual constructor, provided that it will house the battery,
amplifier and requisite terminal blocks. Externally
there must be mounted the "call" switch, and a
locating cradle for the handset, beneath which must
be fitted a push -to -break switch (preferably a leveroperated micro -switch) to cause the amplifier to be
switched off when the handset is on the cradle.
Handset
As purchased, this will be fitted with a twin -core
cabtyre-sheathed cable, which must be removed and
replaced by a four -core cord. In some handsets a
capacitor is connected in parallel with the transmitter, and it optional whether this is left in position
or discarded. A neat four -core cord may be made
by plaiting together two twin twisted flexibles (an
idea of how to do this may be had from examining
a handset cord on a pre -STD GPO instrument in
some public call -boxes).
Flexibles, with transparent insulation are available
with both tinned and untinned conductors, and it
will assist in the final connecting up, as well as
producing a pleasing appearance if different finishes
of conductors are used respectively for transmitter
and receiver. The action of plaiting will cause a
loss of about 30% of the length of the individual
twin -cores, so that due allowance must be made for
this when purchasing. Care must also be taken to
see that the cords are clamped and anchored at each
end to remove all stress from the terminals.
Commissioning
Before the batteries are inserted it must be
ascertained that the polarities are correct, and that
the lines interconnecting the instruments are led to
the correct terminals. A diagram, copied from Fig.
1, neatly drawn and pasted inside the battery -access
panel of each instrument case will complete the
project and afford it a professional appearance. On
test, one of the author's instruments emitted a feedback whistle continuously whilst energised. A glance
at Fig. 1 will show a similarity to the diagram of a
blocking oscillator if a coupling could be arranged
between receiver and transmitter. It was felt that
the four -core cord could produce such a coupling,
and the reversing of the cores to the receiver (or
transmitter did in fact effect a cure.
Authors' Prototype
The authors' prototype instruments, which have
worked perfectly at Knaresborough for six months
in spite of gardening damage to the lines were rather
special in that certain local difficulties had to be
overcome, although they embody the same principal
components as the units described above.
Firstly, the line -wire which happened to be available was ex -army steel -conductor type with a
resistance of about 0.4411/yard. Since the distance
between the stations was 60 yards, the resulting loop resistance of 5011 prevented the use of direct ringing bells or buzzers for calling. A relay was
This shows the cradle -switch and the call -detection relay.
The modified dial mechanism can be seen in the back-
ground.
S' line d.c. blocking capacitor on the right, and
a/so how the cords were lashed so as to relieve the
terminals of all stress.
Note the
therefore fitted at each end to detect the calling
signal and ring the called station's bell from its
local battery. The relay used had a coil resistance
of 6011 and with careful adjustment was made
capable of working with a coil current of only 30mA
which makes adequate allowance for the falling
voltage of an ageing battery.
Secondly, we were fortunate in being able to
obtain a couple of scrap dial-type instruments,
similar to GPO type, of which we were able to use
the case, internal chassis, terminal block and handset cradle -switch. The dial, after modification
(replacing the toothed pulsing cam by a toothless one
so as to give one long "impulse" per operation) was
retained as a call -switch. Removal of the "ringer,"
gongs, induction coil and capacitors gave sufficient
room for the battery, amplifier, and call -detecting
relay to be accommodated inside the instrument.
The calling bell, of the cheap circular type, with
its mechanism beneath the gong was simply affixed
by screws to the rear of the instrument case. A disc,
carefully lettered with calling instructions and fitted
inside the dial gave the final professional touch to
the instruments, which could stand unashamedly
beside GPO counterparts.
Since the handle of the ex-Government sound powered handset is wider than that of the GPO
type carbon handset care must be taken to see that
on being replaced after a conversation it depresses
the cradle -switch plungers sufficiently to switch off
the amplifier. If there is any uncertainty about this,
it may be eliminated either by a bit of judicious
filing, or by cementing a piece of +in. thick -in.
wide plastic to the underside of the handset handle..
569
THIS magazine frequently receives letters from
readers who ask, "How can I get a licence, and
how much is it?", a question which can never be
fully answered in a letter. Many of these inquiries
are in connection with transistor walkie-talkie
transceivers imported from Japan. Others refer to
car radio -telephones. And the rest come from
budding short-wave listeners, who have heard their
first amateur contact on the short-wave band of the
domestic set.
First, it should be made quite clear that licences
are not issued in this country for the use of
transceivers on the Citizens' Band of 27Mc/s. The
Citizens' Band exists in America, and licences to
operate such sets are relatively easy to obtain there.
But the 27Mc/s band is allocated in the United
Kingdom to model control, medical apparatus and
industrial control systems.
There is in fact no Citizens' Band here, and the
GPO will not under any circumstances, or for any
fee, issue a licence. Although it is illegal to use
such apparatus, and an offender may be fined and
have the sets confiscated, it is not illegal to sell them.
This is a fortunate paradox since, provided an
amateur licence is held, these excellent little sets may
be converted for the amateur 28Mc/s band and used
very effectively.*
Many of these sets have been bought by people
who imagine that a licence is not required as they
operate "under the three-mile limit." This is a
complete misconception of the law. The three-mile
limit refers only to the stretch of seawater round the
coast of the United Kingdom, within which its laws
and regulations may be enforced. Outside this limit,
at present, some of these regulations may be broken
with impunity, which is how the pirate broadcasting
stations are able to exist. But the term has nothing
at all to do with the actual range of transmitting
apparatus, and it is therefore illegal to operate in
this country even over a range of a few yards.
The wavebands allocated by the GPO for control
of models only are 2696-27.28Mc/s and 464468Mc/s. The transmitter input must not exceed
5 watts. A licence for this purpose is quite straightforward to obtain, the fee being £1 for five years.
Providing they are not of the super-regenerative
type and do not create television and other
interf erencel-Editor.
*
The address to apply to is: Radio Branch, Radio and
Accommodations Dept., G.P.O. Headquarters, London
E.C.J.
Car radio -telephone systems may be considered in
three classes. Firstly, official services like Fire,
Police and Ambulance, which have their own spot
frequencies specially allocated. Secondly, the GPO
radio-telephone system, where subscribers in certain
areas may rent instruments which are linked to the
ordinary telephone system. The rental for this Post
Office service is sufficiently high for its use to be
mainly confined to business.
Thirdly, private systems, where a firm equips its
own vehicles and sets up a base station. The
apparatus is usually rented from a manufacturer
and special wavebands have been set aside for this
purpose.
We now come to amateur transmitting. Holders
of these licences are able to operate morse, speech,
teleprinter and even television transmitters. Many
of them instal apparatus in their cars for which they
need an additional permit.
Most beginners imagine that obtaining an amateur
licence is largely a question of finance but this is
not so. A fee of two pounds is required, but by the
time the applicant arrives at this stage, the 'money
seems very minor in comparison with the other
requirements. The conditions to be met in order to
be issued with an amateur transmitting licence are
as. follows:
1. Applicants must be over fourteen and be
British subjects.
2. A pass must be obtained in the Radio
Amateurs' Examination. This is a written
examination paper somewhat of a cross
between `O' and 'A' level G.C.E. Physics, but
with a more limited syllabus.
3. A pass must be obtained in the Post Office
morse test, which is a test of receiving and
sending in morse code at twelve words per
minute, plain language and figures.
4. The fee of two pounds annually must be paid.
THE EXAMINATION
The Radio Amateurs' Examination is held twice
a year, usually in May and December, and is
organised by the City and Guilds of London
Institute. The work covered for this examination is
Considered as a subject of study in its own right,
and is listed as subject No. 55.
571
By writing to the Institute at 76 Portland Place,
London W.1, a booklet setting out the syllabus and
copies of previous papers may be obtained. The
papers will give the student a good guide to the
type of question usually set.
Centres where the examination may be taken are
widespread and it is not always necessary to travel
to London. In most cases the local technical college
can make arrangements for the examination to be
sat, but in this case the applicant must ensure that
the college concerned knows that he wishes to sit
the examination there. This should be done at least
two months before the examination day. The college
will probably require a fee of about five shillings.
The examination syllabus and the questions are
compiled by a committee which comprises representatives of the Post Office, Ministry of Education
and the official amateur radio organisation-the
Radio Society of Great Britain, among others. This
means that the questions asked are fair and
applicable to normal amateur practice.
The whole purpose of the examination is to make
sure that a person is not allowed to operate
transmitting apparatus if he does not have sufficient
knowledge to do so safely and without inconvenience
to amateur and other stations.
The two most important questions in the
examination always relate to this aim. In the first
question the applicant is merely required to write
out more -or -less word for word parts of the
conditions set out in the actual licence.
A specimen licence can be obtained from the GPO,
and should be learnt by heart. This part of the
examination should present no problem. The second
question always deals with methods of avoiding or
curing interference to other radio or television
services.
The rest of the syllabus is as follows: elementary
electricity and magnetism, elementary radio
principles, thermionic valves and semiconductors,
radio receivers, low -power transmitters, propagation
of radio waves, aerials and measurementsparticularly frequency measurements. This may
seem a formidable amount of work, but as already
stated the pattern of questions set remains within
fairly narrow limits.
The authorities consider (whether rightly or
wrongly is outside the scope of this article) that any
person sufficiently keen and sufficiently intelligent
not to be a nuisance or danger on the air, will be
able, with reasonable application, to achieve a pass
mark.
Quite obviously, though, it is no use the applicant
sitting back until the examination comes along and
then expecting to sit down and sail through. He
must study, unless, of course, he already possesses
a qualification which has taken him through a similar
course of work.
There are three ways in which such a course of
study may be tackled. Firstly, the books listed in
the City of Guilds pamphlet may be bought or
borrowed from a Public Library, and studied at
home. Secondly, a correspondence course may be
taken. Thirdly, the student may attend a course at
evening school.
Many technical colleges run evening classes in this
work. All that is needed is an inquiry. If there are
enough applicants, a college not already offering such
572
a course will specially arrange one.
The fee is very
small-usually a guinea or two for the whole session.
SHORT WAVE LISTENING
In addition to his studies, the intending applicant
should spend a great deal of time listening on the
amateur bands. These are as follows:
1.8- 2.0 Mc/s (160 metres, or "Top Band")
3
3.8 Mc/s (80 metre band)
7.0- 7.1 Mc/s (40 metre band)
14.0-14.35Mc/s (20 metre band)
21.0-21.45Mc/s (15 metre band)
28.0-29.7 Mc/s (10 metre band)
plus the v.h.f. bands, which the beginner probably
won't be able to receive at first.
By listening regularly, he will become familiar with
amateur procedure and learn a great deal from
listening to contacts. He may also hear pirates.
5-
Pirates are not welcome on the amateur bands, and
they are usually caught in the end. An applicant
for a licence is unlikely to secure it easily if he has
been previously convicted for piracy, so it pays to
be patient and wait for the "ticket."
In the course of his listening, the Short Wave
Listener, as he can now be termed, will come across
a great deal of morse code. Learning to read this
early on will add greatly to his enjoyment as well as
pave the way for the Morse Test later.
THE CODE
There has been much written on learning the code,
but each generation of beginners seems to need the
same advice just as urgently. Learning the code
and learning to use it are two entirely different
things, though obviously one will have to come
before the other.
When first learning the alphabet, do not memorize
dots and dashes, but learn each letter as a
combination of "di" and "dah." For instance, V is
not dot-dot -dot -dash but didididah. Learning the
alphabet in this way will ensure easy transition to
the morse key. A morse operator does not think
about dots and dashes. He recognises the sound
or rhythm.
Here again, some technical colleges run a course
in conjunction with the R.A.E. classes. Also most
radio clubs run practice sessions, and there are
scheduled slow morse transmissions run by the
RSGB usually on 1.8-2.0Mc/s. Finally, practices
with a friend as frequently as possible are invaluable.
All that is needed is a simple oscillator and morse
key.
Mention of the RSGB slow morse and the Radio
'Club sessions prompts two further pieces of advice.
Join your local radio club, where you will meet
many to help you on your way to the ticket; and
join the RSGB, which publishes a monthly bulletin
entirely devoted to amateur radio. In the pages of
their Bulletin details of slow morse transmissions
appear regularly.
A course of study which includes the theory for
the R.A.E. and practice for the morse test will
normally take several months. Do not be tempted
to let the work slip until a week before the
examination and then try to cram. It just won't
work, for most students anyway.
Most would-be amateurs wait to hear their results
in the examination before taking the morse test. The
-continued on page 575
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GETTING YOUR TICKET
-continued from page 572
reason for this is that the morse may be taken any'
time after the examination, but if the morse is taken
first, and twelve months elapse before the examination is passed, then the morse has to be taken again.
Thus if the student failed the examination he might
find the morse test fee wasted!
The morse test may be taken at Head Post Offices
in London, Birmingham, Cambridge, Derby and
Manchester, and at certain coastal radio stations.
Application should be made to: Radio Services Department, Wireless Telegraphy Section, Union House, St.
Martins-le -Grande, London, E.C.I.
The applicant will be sent a form to fill in, and
will have to pay the fee of ten shillings, in the form
of a postage stamp. He will then be given ample
warning of the date and time of his test, usually to
suit him.
The official conducting the test is usually only
too pleased to give a pass slip if he possibly can.
The applicant will often be given a choice of keys
and will have plenty of time to get the feel of the
The examiner will probably send a practice
run first. So there is no reason for the student to
fail through "nerves" provided he has practised
beyond the required speed.
If the applicant is successful in the R.A.E. and
in the Morse Test, he will have now two "pass
slips." These are sent, together with the form
supplied by the GPO and a birth certificate or other
proof of nationality and age, to GPO Headquarters.
The fee should not be sent until asked for.
Eventually the fee will be requested, and quite soon
the "ticket" will arrive.
In fact it is not a ticket, but a rather disappointing
looking collection of typewritten duplicated sheetsbut on it will be written a cailsign, which will be
the password to many happy years and to many
good friends. Good luck! 73!
Further information on obtaining a license may
be found in: "A Guide to Amateur Radio" (5s. 7d.
post paid) and "Radio Amateurs' Examination
Manual" (5s. 9d. post paid) from Radio Society of
Great Britain, 28 Little Russell Street, London, W.C.1;
also "How To Become a Radio Amateur," available
free from Radio Services Branch, G.P.O. Headquarters
Building, St. Martins -le-Grande, London, E.C.1.
key.
OBITUARY-Captain Henry Joseph Round
Captain Henry Joseph Round, M.C., A.R.C.Sc.,
one of the pioneers of broadcasting and a prolific
inventor with 117 patent applications to his credit,
died recently in Bognor Regis.
Captain Round, born on June 2nd, 1881,
graduated from the Royal College of Science,
London, with a first-class honours. In 1902 he
joined The Marconi Company and was sent to the
United States where he worked at the Company's
training school for wireless operators, at Babylon,
Long Island. Here, in his spare time, he investigated
wireless propagation problems, experimented with
dust -core tuning inductances and devised the elements of direction finding.
About this period, and again in his spare time,
Round constructed one of the first arc radio telephones, which on his recall to England he demonstrated to Guglielmo Marconi. He became a
personal assistant to Marconi and was conspicuous
for his ability to rectify obscure faults in the
apparatus of the period. In 1910-11 he greatly
improved the performance of the Clifden (Ireland)
high power trans-Atlantic transmitter and followed
this in 1912 with a brilliant feat of engineering at
two stations on the upper reaches of the River
Amazon which were not achieving the contract
guarantee by reason of heavy signal attenuation
across the jungle. Round virtually redesigned the
stations in situ to operate on 4000 metres by day
and 2000 metres by night, a masterpiece of
ingenuity since no parts were to hand. The occasion
was historic in that it was the first time that,,,
deliberate use had been made of different wavelengths for day and night working.
At the outbreak of the Great War, Round was
seconded to Military Intelligence with the task of
building a network of "valved" direction -finding
stations to cover the entire Western Front. These
stations, which he had developed just prior to the
onset of war, were so successful in pinpointing the
location of enemy transmitters that he was recalled
England to supervise the construction of a
second network there.
Other war work included the co -design with
Major Prince of the first telephony transmitters and
receivers for airborne use, including the design of
the valves. For his services to the country, Captain
Round was awarded the Military Cross.
In 1919 he developed new types of transmitting
valves and in March of that year directed the
installation of a telephony transmitter at Bally bunion, Ireland, which became the first European
station to span the Atlantic with telephony. Further
experimental telephony work at Chelmsford followed which led, via the early broadcasts from the
Marconi 2MT station at Writtle, to the establishment of the original London broadcasting station
2L0 at Marconi House, for which Round designed
the transmitting equipment. In parallel with all this
work he also carried out another huge project, the
redesigning of the Caernarvon high -power station
from spark to valve transmission.
He was appointed chief of the newlÿ formed
Marconi Research Group in 1921. In addition to
his work on short-wave telephony he was responsible for several other developments including the
"Straight Eight" receiver.
In 1931 he resigned from The Marconi Company to set up in private practice as a research
consultant,
returning
to
Marconi's
in
an
advisory capacity in 1937 for work on echo
sounding. During World War II he worked on
ASDIC for the Admiralty, continuing with this
until 1950. In 1952 he was presented with the
prized Armstrong Medal by the Radio Club of
America.
Captain Round has been working in close association with the Marconi organization almost to
the time of his death. He was a truly great engineer,
whose contributions to technology have helped in no
small measure to shape the course of history.
to
575
MICROPHONE STAND
FOR THE
GRUNDIG GDM
By A. D. Cardwell
EVERAL of the microphones supplied with the
popular range of Grundig tape recorders have
no stands. In this article details are given for
a simple stand which can be constructed in about
an hour if you have the use of a sturdy vice.
The necessary materials should be easy to come
in. diameter
by since all you need is a foot of
brass rod (brazing wire from a garage will do), a
small roll of "sticking plaster" and a couple of
rubber grommets. Total cost to the author was
3s. 6d., getting the "sticking plaster" from a local
chemist and the rubber grommets from the spares
department of a Standard Triumph garage (type
metalwork at B and H as shown in Fig. 3 beyond
the 90° point to match the angle in illustration 4.
The next step is to round off this bend with a
screwdriver or similar instrument as shown in Fig. 5
to get the side pieces looking like those illustrated
in Fig. 6. The final step is to bend the rear section
of the base for the microphone cable.
With this completed, one should cut part of each
grommet away and drill as shown in Fig. 7. Be
careful not to have an accident when cutting the
grommet-a wet blade will reduce the risk of the
knife slipping.
The best position for drilling the microphone case
is shown in Fig. 8. One should, however, be careful
not to allow the head of the drill to penetrate too
far when drilling the microphone case as damage
can be done to the microphone insert. Also be
careful not to make the holes too large, otherwise
it will be difficult to secure the grommets.
605851).
No difficulty should be experienced in constructing
this stand if you first mark the brass rod (using the
"sticking plaster") as shown in Fig. 1. Once this
has been done, the bending process can be tackled.
The first bend should be of 90° at position D. Then
make a 900 bend at F to make the brass rod "U"
shaped.
Now the base can be formed by bending the
[ea-3eL--P4.4-1/2"-.4.-1/2
d
A
End
0
C
41
u
11/4"
E
19-
F
ad
I
1/'-H--1/2'
H
IG
H
I
-s
z
End
Centre mark
Pull
This section of
grommet to be cut off
576
33'"
Drilling
point on
each side
of Mic.
NOT BUILD ONE OF OUR
PORTABLE TRANSISTOR
RADIOS...
FIRST FOR PERFORMANCE,
h
QUALITY fr PRICE!
BACKED BY OUR SUPER AFTER SALES SERVICE
"A wonderful range of transistor radios using first grade components for guaranteed results."
NEW ROAMER SEVEN
Mk IV
WAVEBAND PORTABLE OR CAR RADIO
Amazing performance and specification
Now with PHILCO MICRO -ALLOY R.F. TRANSISTORS
FULLY TUNABLE ON ALL WAVEBANDS
9 stages
transistors and 2 diodes
Covers Medium and Long Waves, Trawler Band and three Short
to approx. 15 metres.
Push-pull output for room filling volume from rich toned 7 x 4in. speaker. Air spacedWaves
ganged tuning condenser.
Ferrite rod aerial for M. & L. Waves and telescopic aerial for S. Waves. Real leather -look
case with gilt trim and
shoulder and hand straps. Size 9 x 7 x 4in. approx.
The perfect portable and the ideal ear radio. (Uses PP7 batteries, available anywhere.)
7
-7
* EXTRA
BAND
PIRATE STATIONS, etc.
FOR EASIER TUNING
Total cost of parts now only
OF
P
£5.19.6
NEW MELODY
P
Parts Price List and easy bu'Id
plans 3/- (Free with kit)
MAKER SIX
8 stages- 6 transistors and 2 diodes
Covers Medium and Long Waves and EXTRA SAND FOR EASIER TUNING OF
PIRATE STATIONS, etc. Top quality 3in. Loudspeaker for quality output. Two RF
stages for extra boost. High "Q" bin. Ferrite Rod Aerial. Approx. 350 milliwatts push-pull output. Handsome pocket size case with gilt fittings. Size 6h x 31 x Bin. (Uses long -life PP6 battery.)
Carrying strap 1/6 extra.
3
WAVEBAND PORTABLE
This amazing receiver may
be built for only
NEW TRANSONA FIVE
"Home, Light, A.F.N., Lux. all at good
volume."
G.P., Durham.
7 stages
transistors and
2 diodes
-5
Fully tunable over Medium and Long
Waves and Trawler Band. Incorporates
Ferrite rod aerial, tuning condenser
volume control, new type fine tone super
dynamic Min. speaker, etc. Attractive case. Size 64 x 44 x l,in. with red
speaker grille. (Uses 1289 battery, available anywhere.)
A^f L
`T6 V
Total cost of all
parts now only
Pi/:
3/6&
Parts Price List and easy build
plans 2/(Free with kit)
P.
NEW ROAMER SIX
NOW, WITH PHILCO MICRO -ALLOY
R.F. TRANSISTORS
6 WAVEBAND
8 stages
transistors and 2 diodes
Listen to stations half a world away with this
6 waveband portable. Tunable on Medium and
Long Waves, Trawler Band and two Short
Waves. Sensitive Ferrite rod aerial and telescopic aerial for short waves.
Top grade transistors. 3 -inch speaker, handsome case with gilt fittings.
Size 7! x 5! x Bin. (Carrying strap 1/6 extra.)
-6
*
f
'
I
EXTRA RAND FOR EASIER TUNING OF LUX., ETC.
£
L6J
Total cost of all
parts now only
1
Parts Price List and easy build
(Free with kit)
plans 2/-
P.& P.
3/6
79,L
®®
97 V
L£3..6
7
-5 transistors £t 2 diodes
stages
Covers Medium and Long Waves and
Trawler Band, a feature usually found
in only the most expensive radios.
On test Home, Light, Luxembourg and
many Continental stations were received loud and clear. Designed round
supersensitive Ferrite Rod Aerial and
fine tone 29in. moving coil speaker,
built into attractive black and gold
case. Size 54 x B x 34in. (Uses 1289
battery available anywhere.)
Total cost of all
-
£.9.6.
-
Callers side entrance
Berretts Shoe Shop.
61
BEDFORD
med and Long wave
version with miniature speaker.
Pocket 5
29/6
42/6
P.3& P.
TRANSONA SIX
8
stages
-6
transistors and
diodes
2
This is a top performance receiver covering full
Medium and Long Waves and Trawler Band.
High-grade approx. 3in. speaker makes listening
a pleasure. Push-pull output. Ferrite rod aerial.
Many stations listed in one evening including
Luxembourg loud and clear. Attractive case in
grey with red grille. Size 69 x 44 x 14in. (Uses PP4
battery available anywhere.) Carrying Strap 1/- extra.
Total cost of all
parts now only
59/6
Parts Price List and easy build
plans 1/6
(Free with kit)
P3/6 P
SUPER SEVEN
9
2
Total cost of all
parts now only
L
RADIO EXCHANGE
HIGH STREET,
STOP PRESS!
parts now only
P. & P. 3/Parts Price List and easy build plans 1/6 (Free with kit)
-6
stages
transistors and
diodes
Our latest completely portable transistor
radio covering Medium and Long Waves.
Incorporates pre -tagged circuit board, 3in.
heavy duty speaker, top grade transistors,
volume control, tuning condenser, wave
change slide switch, sensitive 6in. Ferrite
rod aerial. Push-pull output. Wonderful
reception of BBC, Home and Light, 208
and many Continental stations. Handsome leather -look pocket size case, only 60 x 33 x l'sin. approx. with
gilt speaker grille and supplied with hand and shoulder straps.
Parts Price List and easy build
Total cost of all
P. & P.
TL.3 77 V
(Free with kit)
parts now only
3/6
plans 2/-
(Free with kit).
POCKET FIVE
MELODY SIX
8
2
Parts Price List and easy build plans 2/-
P. 3/0
P. &
L31
1
-7 transistors and
stages
diodes
Covers Medium and Long Waves and Trawler
Band. The ideal radio for home, car, or
can be fitted with carrying strap for outdoor
use. Completely portable-has built-in
Ferrite rod aerial for wonderful reception.
Special circuit incorporating 2 RF Stages,
push-pull output, 3in. speaker (will drive
large speaker). Size 74 x 54 x lifn. (Uses
9V battery, available anywhere.)
9.6V
P. & P.
Parts Price List and easy build
7
3/6
CC).
plans 2/-
(Free with kit)
Open 9-5 p.m.
Saturday 9-12.30 p.m.
Telephone: Bedford 52367
577
1st Class
Performance
Quality & value
Sea sisiol
PRICE £18.18.0 Complete
A superior Solid State Stereophonic Amplifier with
sound quality equal to more expensive equipment. Six
watts output, more than adequate for normal room
requirements. Ten Mullard transistors
x AC128,
2 x AC127, AC176 and 0075. Two LF chokes. Five
controls: bass, treble, volume, balance and mains on/off.
Stereo/mono switch. Stereo/mono inputs for gram,
radio or tape. Input impedance 1 megohm. Input
-4
HOME RADIO (Mitcham) LTD.,
sensitivity for full output 560m/v. Bass boost 10db lift
at 50c/s. Treble cut, 10db at 9k/cs. Full wave selenium
bridge rectifier providing 24 volts to amplifier. Speaker
outlets 15ohms impedance. Exceptional appearance in
teak veneered case with aluminium facia and matching
machined alloy control knobs. Printed circuit construction. Size: 134 x 8z x 31in. 200/250 volts AC. Fully
guaranteed.
Stereosouod
Equipment is available from
all retailers, stores and hi-fi
specialists. Write manufacturers for leaflets or about any
supply difficulty.
STEREOSOUND PRODUCTIONS LIMITED, Capital Works,
Wakefield Road, Brighouse, Yorks. LONDON DISTRIBUTORS Highgate Acoustics, 71/73 Great Portland Street, W.1
:
187 London Road, Mitcham, Surrey. Phone: MIT 3282
One of the most interesting sections
of our Components Catalogue is the
KITS SECTION, which runs to 14
pages listing 169 different items.
Here is an extract from the page
dealing with RADIONIC KITS
.
.
.
"Designed for both the beginner (aged 10 and upwards)
and the expert in electronics. The only tools required are
the spanner and a pair of scissors. Build and rebuild as
often as you wish and check circuit at a glance through the
transparent panel. Extra components can be purchased to
expand sets as required. Adopted by Universities,
Technical Colleges, Schools and the Armed Forces for
electronics training."
KT 46 Set No. 1. Fourteen different circuits can be made, including regenerative receivers for earphone operation
65.18.6
KT 48 Set No. 2. Twenty different circuits. T.R.F. and Reflex receivers
£6.19.6
KT 50 Set No. 3. Twenty-two different circuits, including microphone and pick-up amps. and receivers for loudspeaker operation 610.19.6
KT 52 Set No. 4. Twenty-six different circuits, including a 6 -transistor super -heterodyne receiver
614.19.6
7
Please
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listing 6,000 items, 1,000 of them illustrated,
plus a 21 -page supplement? Then post the
coupon now with your cheque or P.O. for 9/-
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write your name and address
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NAME
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HOME RADIO LTD. Dept.
L
578
PW, 187 LONDON ROAD, MITCHAM
i:
r:éeeziige:
riiw:..Y 1-
_
Jlh
.:.a1-ltnel1.zeol
^._.::r-?
e
ezel :s:issiw.íflfti{h<si:
eziteecee:r:
MANY constructors take a pride in making all
the units they build as small as possible.
Naturally, a circuit containing a relay is somewhat of a headache since the standard Post Office
type of relay is rather a bulky device. Smaller relays
are available (sometimes from the surplus market),
but these can be rather expensive, hence the article
on constructing sub -miniature relays. The one
described here can be built at little cost in an
evening. It is possible to deviate from the specification and from the materials used to suit individual
requirements.
In simple terms, the relay is an electrically
operated switch. Current passes through a solenoid
which magnetically attracts the moving portion of
a contact assembly to either make or break a circuit
or circuits. There can be as many circuits as one
likes, but additional circuits add to the weight of
the contact assembly and thus require more power.
The, relay described is a single changeover device
with a common contact and a "make" and a
"break" contact.
CONSTRUCTION
Figure 1 shows the fully assembled relay, Table 1
its specification and Table 2 the materials used.
Construction is not too difficult, and all dimensions
are given in millimetres.
Solenoid
The core of the solenoid must be capable of being
magnetised, but not a material which can become a
permanent magnet. Soft -iron is ideal, and it has
been found that some bolts make perfect cores. If
you are not sure of the suitability of a selected
bolt, first check if it is attracted to an ordinary
magnet, and secondly check if it can become a permanent magnet. To do this, stroke the selected bolt
with a permanent magnet, twenty to thirty times as
shown in Fig. 2. If the selected bolt has permanent
magnet properties, you will now be able to pick up
small metal items with it. If you can, throw it away
and find another with which to make the core.
Change- over
arm
Change-over
arm rest
Make
°
j
Contact
arms
Frame
Constructional details for the frame are included
in Fig. 4. A non-ferrous metal should be used (one
that is not attracted by magnetic fields) such as
aluminium, copper or brass. When completed, it
should be bolted to the solenoid; see Fig. 1 for
TABLE 2
Contact arms
supporting block
Coil
MATERIALS
Fig. 1: Front
Iu'
TFrame
Flap
Break
guide
..
and side
elevation
of the
completed
relay.
Washer
Nut
Washer
25mm.
Coil
m
If one was to use a material with permanent
magnet properties, the contacts would permanently
remain in the energised position.
Once a core has been chosen, the next step is to
make up a yoke to hold the windings. This is best
done with nuts and washers, as shown in Fig. 3.
Size is not critical; the author used 8 mm washers
spaced 13 mm. apart on a 3 mm bolt, which had
an overall length of 25 mm.
The next step is to wind the coil. There are
several methods one can use, from doing the job by
hand, or by machine employing an old gram motor
or an electric drill. The only thing one must
remember is that the turns should be wound fairly
tightly and layer upon layer. Probably the best
way is to start from the left, wind to the right
and then back again until you come up level with
the washers. The author used 44 s.w.g. enamelled copper wire, brought the two ends of the coil out
at the "head end" of the bolt and wrapped the turns
with tape to hold them in position.
If the coil has been
wound tightly, the
TABLE 1
resistance should be
around 20052. Before
SPECIFICATION
proceeding any furSize:
23mm. x 16mm. x
ther, it is worthwhile
9mm. Working voltage: 9 to
checking if the solen24V d.c. Min. operating curoid has the sufficient
rent: 45mA. Contacts: single
pulling power. This
changeover, common with
can be done by
make and break.
attaching the coil to
a 1.5 volt battery and
seeing if the solenoid
will lift small pieces of metal. If it will, in all probability,
there will be sufficient power to move the completed
contact assembly: remember, with a 1.5 V potential the
current through the coil is less than 10mA.
Background
Coil
AK11VG
SUB -MINIATURE
R E LAYS
.V,.
Flap and
lever arm
One 3mm. bolt (25mm. long) with
nuts and 8mm. washers.
44 s.w.g. enamelled -copper wire.
Small piece of tin.
Small piece of thin metal.
Small piece of 5mm. thick perspex.
Short lengths of piano wire (38
s.w.g. or larger).
Insulating tape.
579
positioning. No difficulty should be
encountered in this operation, but one
must be careful to ensure that the end
of the frame is level with the bdlt head.
It should be filed to fit if necessary.
Flap and Lever Arm
The flap and lever arm assembly is
the chief moving part of the relay,
the flap moving towards the solenoid,
when energised, to change the position
of the contacts. Thin metal, less than
lmm., which has the same properties
as the core of the solenoid (being
attracted to a magnet, but not having
permanent magnet properties) should
be used. A strip from an old tobacco tin
is ideal. Fig. 5 shows the dimensions.
The fold should be almost a rightangle, but not quite so that maximum
contact is made with the bolt head
when the solenoid is operated.
The rest arm for the lever assembly
can be made from perspex and glued
in position. Whilst this sets, the flap
arm, which locates and positions the
flap and lever arm, may be cut; see
Fig. 6. Again this is bent just short of
a right angle.
Lay the completed lever assembly
on to the frame of the relay and
position it so that a light depression
on the flap will cause the end carrying
the arm rest to lift a millimetre or so
in the air. In this position the flap
should lie flat on the head of the bolt.
Fig. 7 shows the required overhang of
the flap guide.
Supporting Block for
Contact Arms
A block of perspex is used to support the contact arms. This is cut to
the dimensions specified in Fig. 8. The
block itself is "T" shaped, the lower
portion of the "T" resting on the flap
guide and upper section projecting
out above the arms of the flap and
lever arm assembly; Fig. 10 shows
this. The five holes in the block are to
take the contacts and the terminating
pins for the coil. If a very small drill
is not to hand, it is possible to burn
the holes through with the actual
contact bars (38 gauge or thicker
piano wire) and the terminals.
Contacts
The contacts are made from piano
wire and heated into the supporting
block (see Fig. 9). The centre contact,
the changeover arm, should be fitted
before the other two contacts which,,
if possible, should be of thicker wire.
The ends of these should be bent at
580
right -angles and positioned so that
they are 1 to 2mm. away from the
changeover arm rest. Also be careful
to leave enough projecting through
the other side of the supporting block
for the solder connections.
The contact bar nearest the frame
should just touch the centre contact
bar and the upper one should be close
but not actually touching the centre
bar. A little adjustment will be needed
here to get the lower arm to break
away from the centre rod when the
relay is operated.
The pins for the coil terminations
may be made from almost anything,
since they too can be heated into the
perspex.
--
Finish
r
3mm.
bolt
é
Magnet
2
Tape
yìr: ..vì
.; M;i:>ineeL!A
Positioning Supporting
Block
When fitting the supporting block
to the frame of the relay it is important
to make sure that the lever arm can
move freely before glueing the block in
position. Once set, the relay is ready
for testing.
Windings
(b)
3
Ea.-18mm
Hole 3mm.
dia. clear
{-
--
_t_
mm.
Hole
2mm. dia.
Final Adjustment
In all probability it will be necessary
to make some adjustment to the
contacts before putting the relay into
service. To do this, it is best to heat
the contact bars and rotate them to
the wanted position. As soon as heat
is removed from the bars, the perspex
hardens and will hold the contact bars
in position.
Now is the time to put 12 volts
across the relay. If it fails to operate,
possibly the centre contact is under too
much pressure. Check this by gently
-continued on page
29mm.
<
20mm.
1mm.l
7
3-mm.
mm.
l
Arm rest
3mm.
7mm.
3mm.
;i
5
583
2.5
I
i
M.
mm.1-**
2. Elliptical path to be taken with the
magnet when stroking the bolt.
Fold
here
6
6mm.-{ -1mm.
3. (a) 3mm. bolt; showing positioning
of nuts and washers. (b) cross-sectional
view of bolt after coil winding.
Flap
guide
"4 ï
................:;
Flap and
4. Frame assembly (about 1mm. thick).
5. Flap and lever arm assembly.
lever
arm
7
r.-7mm.-.1
6. Flap guide.
Cross-sectional view showing overhang of flap guide.
7.
-
o
1mm.
1
8. Contact arms supporting block.
o
8
l''-m4m.
--,
° °
5mm.
i
44'25mm.
CD> MULTIPLIER
FOR THE R1155
THE
R1J155 is a 10 -valve communications and
direction finding receiver which, together with
its associated T1154 transmitter, loop aerial and
visual direction finding indicator, was used
extensively in aircraft during the last war.
Although sensitivity is good, selectivity is not up
to communication receiver standards owing to the
absence of a crystal filter in the i.f. stages. The
response curve of the i.f.. amplifier indicates a
bandwidth of 4.3kc/s at the 6dB points and
several methods of improving this were considered.
Fortunately, the direction finding part of the receiver
is largely independent of the remainder and the three
DF valves and the bulk of the DF components can
be removed, leaving space for modifications and
additions.
Mechanical filters of Japanese origin are now
obtainable at moderate cost, but these, unfortunately,
are only available for an i.f. of 455kc/s while the
R1155 has an i.f. of 560kc/s. Construction of a
crystal filter was thought to be impracticable and a
regenerative i.f. stage was also rejected, since these
can lead to a noisy background and instability.
Finally, interest was aroused in the Q Multiplier.
An experimental model was constructed using an
outboard chassis, and was eventually incorporated
within the R1155 itself, using the space occupied
by the Jones plugs and sockets for the panel controls.
The Q Multiplier is essentially a parallel tuned
circuit resonating at the i.f. frequency and connected
between the frequency changer anode and chassis.
A parallel tuned circuit offers a high impedance at
its resonant frequency and can be regarded as a
band stop filter or a rejector type wavetrap. When
regeneration is applied to the parallel circuit the Q is
-
3 -gang
tuning
BFO
a
capacitor
31
v10
Fig. 1: Layout of the complete chassis. The valve positions
are as follows: V1, V2 D.F. Switching (VR99 or X66); V3
R.F. Amplifier (VR 100ror KTW62); V4 Frequency Changer
(VR99 or X66); V5 1st 1.F. Amplifier (VR100 or KTW62);
V6 2nd I.F. Amplifier (VR100 or KTW62); V7 Beat
Frequency Oscillator (VR101 or MHLD6); V8 L.F.
Amplifier (VR101 or MHLD6); V9 D.F. Meter Switching
(VR102 or BL63); VIO Tuning Indicator (VI103 or Y61)..
C.MOLLOY
boosted to a high value, H.T.+
R3
resulting in a sharp,
lOkfl
narrow rejection notch.
When this circuit is
connected to a frequenSta
csl
cy changer, frequen01
cies outside the rejec350vw.
2
tion notch are shunted
2200pF
through the low impedance of the parallel
circuit and as a result
they do not enter the
i.f. amplifier. Frequen- To V4
cies within the re- anode
or
jection notch cannot on 1155
ECC83
pass through the tuned
circuit and are applied
TópF
to the i.f. input and
amplified. The combined effect of the Q
Multiplier and i.f. amplifier is to produce a
sharp peak to the i.f.
response, the width of
the peak being controlled by the regeneration control. The .position of the peak within
the i.f. passband can be Fig. 2: Circuit diagram of the
"Q" Multiplier.
adjusted by the variable tuning capacitor.
The circuit derived after some trial and error is
shown in Fig. 2. The inductor Ll together with
C2 and C3 form a Colpitts oscillator, the frequency
being adjustable over a small range by C5. The
amount of feedback is controlled by VR1.
Decoupling is provided by R3 and C6, the r.f. choke
preventing leakage at the i.f. frequency. Coupling
to the receiver is via Cl, which also isolates the h.t.
on the frequency changer from the Q Multiplier.
A small chassis 5 x 24- x In. which was available
was found to be adequate. It was thought advisable
to mount Li on the underside in order to avoid
touching it while operating the controls. This
inductor is pot cored, a hexagonal trimming tool
being required to adjust the core. A suitable tool
was obtained from the supplier of the coil. A
screened r.f. choke is preferred and several are
available among the redundant DF components in
the 81155: The one chosen was taken from the
screened compartment behind the b.f.o. valve (L2).
Care should be taken not to interfere with L25
which is situated near V8 and the third i.f.
transformer (Fig. 1). This component is of a similar
shape to the one specified but is of a different type
(10C/2186). It is required in the communication
part of the receiver and should not be removed. It
F,
581
is not essential to use the r.f. choke specified, several
types were tried and the circuit would even work
with a 47k11 resistor in place of the choke.
Good quality co -axial cable is used between V4
anode and the Q Multiplier. The length of this
cable is kept as short as possible as its capacitance
will detune the first i.f. transformer. Re-alignment
of the first i.f. stage will be necessary and the cores
of the transformer will not be able to peak if the
cable is longer than about 3 feet. The value of
resistor R2 may have to be changed on account of
differences in layout and supply voltages, details of
how to do this are given in the setting up
instructions.
Published circuits of Q Multipliers show the
tuning capacitor C5 connected across Ll, which
means that both sides of C5 are at h.t. potential.
Satisfactory operation was obtained with one side
connected to chassis as shown, thus allowing a
standard component to be used. In the interests of
frequency stability close tolerance silver mica
capacitors should be used for C2 and C3, though
the actual values are not critical. The power drain
of the Q Multiplier is small, the h.t. consumption
is only ImA. Both the h.t. and heater currents
should be easily obtained from the R1,155 without
overloading its power supply.
Setting up
With the Q Multiplier switch in the off position
connect it to the receiver and re -align the i.f. stages,
making sure that the a.v.c. is off. Tune the receiver
to a steady signal such as a local medium wave
transmitter and use the magic eye as a peaking
indicator while the cores are being adjusted. After
alignment is complete, switch on the Q Multiplier
with C5 and VR1 set to mid position. Adjust the
core of L1 until a signal is heard, using C5 as a
fine tuner. If VR1 is advanced, oscillation will
occur and the control should be set just short of the
oscillation point to obtain maximum selectivity. It
will probably be too sharp for other than c.w.
reception and the control should be backed further
until sufficient bandwidth is obtained. If oscillation
does not occur when VR1 is advanced then R2 is
of too high a value and must be reduced to 5.6kfl.
If oscillation occurs, irrespective of the position of
the regeneration control, then R2 should be increased
to 8.2k12: After a little practice with the controls it
should be possible to obtain selectivity comparable
to that given by a crystal filter. With VR1 set for
maximum selectivity, speech becomes unintelligible
and each sideband can be selected at will.
At this point the reader may think that an
outboard Q Multiplier would be adequate for his
needs. Commercial add-on units are available which
use their own power supply or the receiver supply.
Constructional details are not given here as the unit
described was experimental and was subsequently
dismantled and rebuilt as an integral part of the
R1155. There is no reason why it could not be
fitted into a small metal case and used permanently
in this way. Operation on 465kc/s can be obtained
by changing C3 to 1000pF, C2 to 3000pF and C5
to 100pF.
The remainder of the article describes how the
Q Multiplier was fitted into the R1155. This should
not be attempted by anyone who has not had
582
11
P2
PI
SKI
II
[12
i[1
p4
311
H.T.8[1
A.F.
6[1
LT.
L.T.+
[16
Aerial
a8
-
4[1
511
OI
711
`v'
Aerial
211
11/2"
Fig. 3: Front view
of the Jones plugs
and sockets.
Fig. 4: Dimensions
for the adaptor
plate to convert
Octal to B9A.
previous experience of wiring or receiver construction. A novice could very easily put his R1155 out
of action permanently.
Removal of Components
The following components should be removed
In each case the associated
wiring must be traced back to source and cut.
Meter Balance Control; Meter Deflection Switch;
Aural Sense switch and associated tagboard and
resistors; Valveholders V1 and V2; Tagboard and
components mounted beside V1 and V2 on the end
of the coil compartment. The two large inductors
and mounting plate situated behind the Jones plugs
and sockets. The metal panel labels screwed to the
top of the front plate.
from the receiver.
New Components
Fit a jack type socket in place of the Meter
Balance control, the second terminal or body of the
socket going to the chassis. This is the new high
impedance phones socket.
A banana socket fitted in place of the Meter
Deflection switch provides the new aerial input.
A 4 -pin Painton socket (type 500467) or similar,
replaces the Aural Sense switch. This will only be
required if an external power supply for the receiver
is in use. A square hole should be cut in the front
panel to accommodate this.
A small metal adaptor plate mounting a B9A
valveholder is now mounted in place of Vl to hold
the Q Multiplier valve. A neat job can be made
using an adaptor plate and details are shown in
figure 4.
Before removal of the Jones sockets and plugs
the aerial, phones and power wiring must be moved
to their new location.
Aerial Inputs
When the receiver was originally in use in an
aircraft a fixed aerial was utilised for ranges 1 and 2
(18.5Mc/s to 3Mc/s) and a trailing aerial for ranges
3, 4 and 5 (1.5Mc/s to 75kc/s). Pl pin 1 is the fixed
aerial input and P1 pin 2 the trailing aerial (Fig. 3).
Unsolder from pins 1 and 2 the two wires coming
from above the chassis, pull them back and connect
each of them to the new aerial socket. This will
provide a single aerial socket for all ranges. The
two 2.2M12 resistors connected from Pl pins 1 and 2
to earth are not required and should be removed.
Phones Output
The connection from the output transformer
comes via a grey wire from a tagboard mounted
below the chassis at the front left-hand side of the
receiver. This wire passes along a metal channel and
terminates on P1 pin 6. Unsolder this wire from
pin 6, pull it back through the channel and extend
it to the new phone socket immediately above, at
the top left hand corner of the front panel.
Internal Power Wiring
Bolt a 4 -way tagstrip to the underside of the
chassis behind the Jones plugs and socket and
transfer the internal power leads to it. The remaining wires connected to Pl, P2 and SK1 are not
required and should be unsoldered, traced back to
their source and cut. The Jones plug and sockets
can now be removed. Note, HT is NOT connected
direct to the chassis but passes through a bias
resistor.
If an internal power pack is in use, as in the
writer's receiver, connection can be made to it from
the tagblock. When an external power pack is used,
run wires from the tagblock to the Painton socket.
The wires from the power pack will have to be
connected to the corresponding pins of a Painton
4 -way plug (cat. 500207).
Installation
A metal panel 41 x 24in. mounting VR1, C4, C5
MAKING SUB -MINIATURE RELAYS
-continued from page
580
lifting it up with a pair of tweezers and seeing if
the arm pulls in when 12V is applied. If this is
the case, the wire must be bent upwards to
release the pressure; adjusting the other contacts
accordingly.
*
components list
Resistors:
R1
Capacitors:
2.2Mû
Cl
100pF
6.8kû
C2
2,200pF
10kû
C3 800pF
5k12 potentiometer
C4 500pF
(Radiospares
C5 50pF variable
midget)
C6 0.11.iF 350V
Miscellaneous: 121 Q Multiplier pot -cored coil type
R2
R3
VR1
Q46 Electroniques. Bridge Road, Felixstowe, Suffolk.
L2 r.f. choke type 10C/2019 see text, S1 a/S1 b
4 -pole 2 -way midget rotary wavechange switchonly two poles used, V1, 12AX7 or ECC83-only
one section used.
and the 2 -pole switch is now fixed to the front panel
in the space vacated by the Jones plugs and sockets.
A length of co -axial cable runs from the panel to the
anode of V4, the screen being connected to chassis.
C4 is mounted on a spare contact of the switch.
Two screened leads run to the remaining components
which are located around the B9A valveholder. The
space vacated by V2 is used above the chassis for
the r.f. choke and L1 is mounted underneath. C31
is a 4µF paper capacitor connected between HT+
and chassis. This component, if still required, can
be replaced by a small 350V working electrolytic and
space then becomes available which can be used as
and alternative location for the Q Multiplier coil,
choke and associated components. This would
shorten the leads required to the front panel controls.
The writer was unable to do this as a mains transformer and smoothing choke had already been fitted
here.
No difficulty was experienced operating the Q
Multiplier in its new location. Setting up, as described earlier, including the adjustment of the 1st i.f.
transformer cores was necessary on account of the
new layout.
Make
arm
Coil
wire
Coil pin
Contact arms
supporting
block
Flap
guide
Change -over
arm
Coil pin
2mm. dia.
hole
Soldering
iron
Pliers
Break arm
bit.
Flap and lever arm
Fig. 9: (left) Method
of locking wire conWire
Supporting
block
i
-
`-
Vice
jaws
J
d
Frame
Change -over arm rest
tact arms in supporting
block.
Fig. 10: (right) Con tact arms and lever
arm assembly.
If still unsuccessful, it is possible that the piano
wire used is too heavy a gauge.
Extra Poles
It is possible to add another changeover to the
relay if required. It is best to place the extra one
to the side of the existing one in preference to
placing above it.
le
583
receiving the
..
e.
BBC STEREO PROGR
that the BBC is at last transmitting regular
two -channel stereo programmes, many readers
are asking how it works and what extras are needed
to receive the programmes and so forth. This article
sets out tò answer such questions, starting first at the
transmitting end of the chain.
Stereo programmes are transmitted at v.h.f. in Band
II, using frequency-modulation. The Wrotham and
Dover stations are the first to carry the new signals, but
within a year or so stereo will be extended to the Sutton
Coldfield and Holme Moss transmitters. Public reaction to the system and prevailing economic factors will
determine the subsequent rate of development and the
nature of the stereo programmes transmitted. The first
stereo broadcasts are in the Third Network Music
Programmes (see Radio Times).
\OW
How Stereo
is
Transmitted
Stereo reproduction demands two (or more) isolated
audio channels from the sound source to the listeners'
ears (Fig. 1). The requirements, therefore, are for two
microphones, two isolated audio channels and two
loudspeakers. On stereo tape the two channels are
recorded separately side by side, while the channel
isolation on disc records is achieved by the effective
cutting of two modulation tracks at right -angles to
each other.
It would be possible, of course, to maintain this
two -channel isolation on radio by sending the information of the right-hand channel through one transmitter
and that in the left-hand channel through a second
transmitter. This system,
Sound source
which calls for two receivers, works quite well
Right-hand
Left -hand
microphone
ss microphone
and readers may recall
O
,experiments along these
lines being made by
the BBC some time ago,
with the v.h.f. set carrysignal
signal
ing one channel and the
Isolated
television sound section
audio
channels
the second channel.
This is a very costly
way of handling the
problem since, apart
from the need for two
receivers, it holds the
services of two trans\
/
Far better
mitters.
LeftRight\
/
hand
hand
\
/
methods have since been
speaker
speaker
\
/
\
\
\
/
\
/
/
Fig. 1. Stereo reproduction
requires the use of at least
\//
V
/\
Zone of
o
two isolated audio channels. The signal in the lefthand channel is called the
A signal and that in the
right-hand channel the B
signal.
584
evolved, requiring only one transmitter for the two
channels of audio information and no more radio space
than required for a single channel mono transmission.
After examining the various methods put forward,
Working Party S of the European Broadcasting Union
proposed the Zenith -GE system for Europe. This is an
American system, created jointly by the American
General Electric Company and the Zenith Radio
Corporation, and is, in fact, the system now in use by
the BBC with the pre-emphasis changed from the
American 75µS to the British 501/S.
Compatibility
A stereo broadcasting system must be compatible.
This means that a stereo transmission must produce
correctly balanced mono when tuned in by any ordinary
f.m. set or tuner. Incorrect balance would be obtained
if the mono set responded only to one of the stereo
channels or if the right and left-hand information
failed to be correctly integrated.
The Zenith -GE system is, of course, compatible, and
by tuning in a stereo transmission on any ordinary
mono receiver a perfect mono reproduction is obtained.
However, when that same transmission is tuned in by
a stereo radio or tuner or one with a stereo decoder
attached, then the signals in the right- and left-hand
channels are adequately isolated and fed to their
corresponding audio channels
Now, from the original source of sound, the signal
given by the left-hand microphone (see Fig. 1) is called
the A signal and that from the right-hand microphone
is called the B signal. Clearly, then, A -I -B signal is
equal to correctly balanced mono signal. By the same
token, therefore, A-B signal must equal the stereo
information. The A --B signal is called the M signal
(M for mono) and the A-B signal is called the
'A signal (left)
Stereo
in
VH F
M signal
(A+B)
signals:
signals
19 kc/s
-'
-
.3.311S
Matrix
pilot:'
3kc/scarrser
nerator
Double
..
..,sideiaand
S
signal
(A -B)
B signal (right)
in
amplitude
modulator
..
signal
VHF FM.:.
transmitter
38kc/s
>uppressor
4
3$kc/s
5ub -carrier
generator
Upper and lower
sidebands
of S signal
minus 38kc/s
sub -carrier
Fig. 2. Block diagram of the essential features of the
transmitting end of the Zenith -GE stereo system. The M
or mono signal is A ±B and the S or stereo signal is A-B.
dmp tan
Bedford
k. royal
a
Stowmarket
tori
MMES
for stereo).
The M signal is obtained
at the transmitter by adding
the A and B signals, while
the S signal is derived from
subtraction, these processes
being handled by a so-called
matrix. We shall see later
that a matrix is also used
in the decoder of a stereo
receiver to produce the ultimate A and B signals.
S
signal
i
Dunstable ("Luton
Aylesbury
Berkhamsted
e
tester
High
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Henley-on
Want ge
EEping
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Abingdon
(S
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Wyleig
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Sevenoaks
Redhill
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Basingstoke
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Steyn ¡rig
:oreham Chichester-
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Canterbury
Ramsgate
Sandwich
D481W ROTHAM)
Ton bridge Ashford
Crawley
Royal(Tunbridge
Haslemere
iN2M
orsham E.Grínstead
Wells
Alresford
Hj
Haywards. Heath
WlncFiester..
jRetersfield
ö
WR-0THAM
*Sutton
Woking
Aldersft
-on -Sea
LONDON
11
Newbu}y
48
Clacton-
Chelmsford
Brentwood
Wycombe &Watford
Uxbridge
sic,h
ui
Felixstowe
Co lc heste
Bishop's
/Hertford
¡burgh
48
Stortford Braintree
Th
A
*Ipswich
Sudbury
Saffron Walden
Hitchin
B
adleigh
8
.
Woodbridge
H
Bíggleswade
Hanbury
De dd in
Bury St,Edmunds
,8
SWINGATE
Folkes-tone
Dover
48(WROTHAM)
Uckfield
Lewes
:ttle
Bexhill
Hastings
At this juncture it would be
n
-Ar nde wa grighton
best for us to take up the
48 (SWINGATE)
orthin Seaford'
Cowes Pe
Bognor
0 5 10
30
20
40
Eastbourne
story by referring to the basic
Regis
..:
Ryde Sno
9
48
th
block diagram of a stereo
miles
transmitter (Fig. 2). So far we
we have seen that the M Wrotham and Swingate are the only two BBC sound stations to radiate stereo. The
and S signals are obtained contours on the map indicate field -strength in dB relative to 14//m for a receiving
aerial height of 30 ft.
from the matrix due to A
and B input signals. Now, the M signal is fed to the
modulation
input of the v.h.f. f.m. transmitter is interv.h.f. transmitter and thus modulates the v.h.f. carrier
posed a 38kc/s sub -carrier suppressing network, leaving
in the ordinary manner. The transmitter also receives
only the upper and lowe S signal sidebands for modulaa 19kc/s pilot carrier signal and upper and lower side tion. These sidebands fail to overlap the other modulation
bands of the S signal. The v.h.f. carrier wave is,
signals because they are spaced either side of 38kc/s
therefore, frequency -modulated by three separate signals,
on the modulation spectrum, as shown in Fig. 3.
which are (i) the ordinary M signals, (ii) the l9kc/s
It should be remembered that all these signals topilot signal and (iii) the sidebands only of the S signal.
gether frequency -modulate the v.h.f. carrier.
The first modulation signal provides ordinary mono
receivers responding to the transmission with a mono
Ratio Detector
signal (giving the system compatibility), while the
second and third signals are concerned only with the
Fig. 4 shows a typical balanced ratio detector circuit
that may be found in a good quality f.m. tuner or
stereo information. These signals are rejected by mono
receiver. Some sets may effectively employ a slightly
receivers and accepted only by stereo receivers, as we
different version of this circuit or a Foster-Seeley
shall see later.
discriminator. A well designed balanced ratio detector
Sidebands
is capable of good quality demodulation and has certain
The upper and lower sidebands of the S signal can
advantages with regard to stereo. But whatever type of
only be obtained by first modulating the S signal onto
detector is used, its response must be sufficiently wide to
a carrier wave. To keep the S sidebands within the
channel spectrum, a frequency of 38kc/s is chosen for
the sub-carrier, and this carrier signal along with the S
signal (which is effective audio, of course) is applied to
R1
a doúble-sideband amplitude modulator.
From LE
stages
..
,
.
1
Suppressed Sub -Carrier
Between the output of this modulator and the
De
-emphasis
-curve
Sub -carrier
i
R2
suppressed
Ratio
detector
transformer
TC2
50c/s
15kc/s
38kc/s
{ \ 23kc/s
19kc/s\
Frequency
53kc/s
-*-
Fig. 3. Showing the frequency disposition of the various
modulation signals.
R1
Cl
Audio
output
Fig. 4. The output circuit of a ratio detector used in many
receivers and tuners. When feeding the signal into a stereo
decoder either the de -emphasis components Rl and Cl
should be removed or the output should be taken from the
top of Rl .
585
avoid cutting the higher order modulation components of the v.h.f. signal,
and the same must apply to the i.f.
channel which feeds the detector.
When the circuit in Fig. 4 receives
a mono f.m. signal it develops across
C2 the audio modulation of that
signal. The audio is normally fed out
through network Cl, Rl for de emphasis. This is necessary because
pre-emphasis is given to the modulation signal at the transmitter to improve the system's signal/noise ratio.
Pre-emphasis means treble lift and
de -emphasis treble cut. If the deemphasis at the set end equals the
pre-emphasis at the transmitting end,
the result is a flat overall audio response. Improved signal/noise ratio
occurs because the treble cut (de -emphasis) at the
receiver reduces the worst of the high audio-frequency
noise at the same time as correcting for the treble lift
(pre -emphasis) at the transmitter.
It is important to bear this in mind because when a
stereo decoder is fitted to a mono set or tuner the
original de -emphasis circuit has to be disconnected.
The reason for this is that the de-emphasis circuit
effectively attenuates at the rate of 6dB/octave all the
stereo information that is present on the transmission.
Thus, with the de -emphasis circuit connected, the pilot
carrier and upper and lower sidebands of the S signal
are all suppressed and the receiver then behaves exactly
the same on stereo transmissions as on mono ones.
Now let us suppose that we disconnect R1 and Cl
in Fig. 4 and take the modulation output direct from
across C2. We get the M signal as before, but in
addition we get the pilot carrier and S signal sidebands.
These are of no use to mono sets and tuners, but when
a mono receiver is linked to a decoder it then becomes
possible to reclaim the S signal, thereby making it possible
to obtain the left and right-hand A and B signals.
Commercial stereo decoder unit designed for
plugging into the Bang and Olufsen Beomaster 1000,
integrated stereo tuner and hi-fi amplifier.
38kc/s sub -carrier is added, and amplitude demodulation produces the S signal, fed to the matrix.
The matrix processes the M and S signals so that they
yield the original A and B signals in the left and righthand channels respectively. The matrix can be considered as a balanced bridge detector, arranged so that.
the combination of the 38kc/s sub -carrier and the S
and M signals produces a modulation pattern, on one
side of which is the left-hand channel and on the other
side the right-hand channel envelope. Looking at it
that way, each channel is then detected by the bridge;
actuated synchronously by the 38kc/s signal.
The original A and B information is obtained because
(A-B) = 2B,
(A+B) + (A-B) = 2A and (A+B)
the matrix, in effect, giving rise to simple addition and
subtraction, as intimated at the start of this article.
The A and B signals from the matrix are then fed to
separate left and right-hand audio channels, via 50µS
de -emphasis circuits, and thence to corresponding
Fig. 6.
=
speakers.
Basic Decoder
to consider how this works from the block
diagram given in Fig. 5. Here the modulation signal
from the output of the receiver's detector (minus the de emphasis) is applied to a signal amplifier in the decoder.
The M signal from the output of this amplifier is taken
direct to the matrix (which has the reciprocal action of
that at the transmitter). For this matrix to deliver A and
B signals it must receive the S signal as well as the
It
is best
Deviation
The reason for suppressing the 38kc/s sub -carrier
and then re-inserting it again in the decoder may not
be apparent. It is concerned with modulation percentage or deviation. If the 38kc/s sub -carrier were
retained, its depth of modulation on the main v.h.f.
carrier would be such that the deviation of the audio
signals (M and S signals) would have to be reduced to
avoid over-modulation. Less modulation depth is produced by the 19kc/s pilot carrier owing to its reduced
level in terms of v.h.f. modulation. In practice, the pilot
carrier accounts for about 10 per cent of the total
M signal.
The S signal, however, cannot be obtained by detection without the 38kc/s sub -carrier (suppressed at the
transmitter) first being re-inserted. This is where the
19kc/s pilot carrier signal
from
comes in. This signal is passed InputF.M.
M
sometimes
detector
through a filter,
with extra amplification, and
then into a frequency doubling
stage, stepping up the frequency
to 38kc/s.
19kcls pilot
The signal amplifier also
rirT,pkfiie,
Fiter
passes the upper and lower
-ì-
sidebands to a synchronous
detector, at which stage the
Fig. 5. Block diagram showing
the stages of
586
a
stereo decoder.
Left
M signal
and right
audio
outputs
signal
requeubtenrcy
dó
..
S
signal
sidebands
only
^en^
carter
filter
b
1"A
B
38kc/s signal
yticiiroflOus
detiector_
S signal
H7. -1-190V
100k51
'A'
channel
220kI1
0.02pF
ECC83
100k11
O01.0F
27pF
o
Input
T
47OpF
from
10ká1
F.M.
'
circuit board sub -assembly.
Separate decoders are also
being made, self-powered or
for powering from the
parent set. Some of the
latest f.m. tuners have plugin provision for decoder
sub -assemblies, such an assembly being depicted in
Fig. 6 for the Bang and
Olufsen Beomaster 1000,
integrated f.m. tuner and
stereo amplifier.
TO47
tuner
pF
82
kn
Valve Decoder
I2
22kR
.B,
kR
Fig. 7 shows a valve decoder designed by the American Dyna Company. This
uses two valves, a double triode ECC83 and a triode pentode ECF80. The first
Fig. 7. Circuit diatriode of the ECC83 is argram
of valve
ranged in a cathode -follower
decoder used in an
stage, having a high input
American tuner.
impedance (to avoid f.m.
detector loading) and a medium output impedance at
the cathode. This valve does not amplify, but serves
essentially to match the f.m. detector to the decoding
circuits without matching loss.
The second triode of the ECC83 is an M and S
signal amplifier, picking up signal from the first
triode's cathode and applying its output at the anode
to the matrix transformer T1. Filter Fl passes the M
signal and the S sidebands but rejects the pilot carrier.
The 19kc/s pilot carrier signal which is also present
at the first triode cathode is fed to the first grid of the
pentode of the ECF80, this section being arranged as
pilot carrier amplifier. This signal is tuned by filter F2 at
the input and filter F3 at the output. Frequency doubling is performed by the triode of the ECF80 and the
38kc/s sub -carrier is developed across the primary of Tl.
The four diodes and associated resistors in the combined synchronous detector and matrix circuit receive
channel
HT-
01yF
From
collector
of Tr4
47ká1
22
kR
500
pF
o
..
0.13.1F
1.2
M11
7O001
1/2ECF8O
F2
PF
500
pF
24052
0006
F3
4,T
II
2.2k51
s
modulation, leaving 90 per cent for the M and S signals.
Both these signals can separately modulate the v.h.f.
carrier to a maximum of 90 per cent because they never
rise together. When the modulation of, say, the M
channel is rising it is falling on the S channel.
In stereo tuners and receivers the decoder circuit is
integrated and often takes the form of a small printed
-continued on
page 590
- 24V
10kí2
F2
19 kc/s
Tri
4pF
AC126
AC126
AC126
Tr4
AC126
To
triode
grid of
ECF80
120kí1
47kí
47kc
Input
from
F.M.
tuner
o
270.a
56kí
7820
18k.a
15k51
200pF
19kc/s
pF
47kfl
F1I
I
-f-
Fig. 8. Transistor decoder circuit, based on the B & 0 1000.
587
S.W. Broadcast Stations
I REFER to the letter on page 201, July
issue, by Mr. N. D. Mugford.
Mr. Mugford has the advantage over a
great majority of the people on this earth,
that he lives in a free (relatively so) and
democratic society. I do too. Therefore,
Mr. Mugford immediately has no right to
demand of you that you cease printing
details of communist broadcasters, just
because he doesn't like what they're doing!
However, away from the political side
of it all, and assuming that Mr. Mugford
simply objects to Radio Peking, Radio
Sofia, RBI, Radio Moscow, etc., because
they contravene the ITU and clutter up
the bands, using non -broadcast -assigned
frequencies, etc., then we find a strange
he forgot the
omission in his listings
BBC, poor chap! Here we have a prime
example of how to sign the rules, then
01' Granny BBC's got some
forget 'em
strange frequencies hitched to her girdle,
like 9410kc/s, 18150kc/s, 12095kc/s, and a
few more!
So now, Mr. Editor, I must beseech you
Sir, don't ever print any mention of the
BBC until they drop all their naughty ways
And of course, they will take ever -so -much
notice of the tremendous loss of listeners
through your silence of their name!
Of course, Sir, you would then have to
omit reference to any others so misusing
the bands, which means nearly every
international broadcaster worth his salt,
and many who aren't.
New South Wales,
Robert Ronai,
Australia.
Australian Radio DX Club.
NEWS AND..
HARLOW MOBILE RALLY
...
...
!
Valve Information: VX3188
MAY I correct the information given by
your correspondent, W. Ritchie, on page
33 of the October issue?
The VX3188 is equivalent to the CV2277
and is a low -impedance pentode for use as
an a.f. power amplifier and as a series
valve in voltage stabilisers. The manufacturer's data sheet gives the following
information: Vx 26.5V, IA 90mA, Ix
0.23A, Vgl -13V, VA 100V, gm 9.5
mA/V, Vg2 100V, uA 8500f, Base: B9A.
Figures are also given for operation with
VA & Vg2=26.5V.
J. R. W. Murland.
Co. Down,
N. Ireland.
On Sunday September 25th, a stream of traffic came in all shapes and
sizes to Magdalen Laver. A family saloon with a base loaded whip on
the front and a mini -halo on the back. A motor bike with a side car so
full of gear it looked like a mobile Jodrell Bank. There was even a mobile
on a bicycle, wobbling along the road with a huge whip towering upwards from the back of the saddle.
Without a doubt this is the friendliest rally your reporter has been to.
The beaming face of Fred G3TLF on the front doorway and the eager
handshakes from various people who five minutes past had been complete strangers all sum up the Harlow Rally.
The organisers covered everything; tea -and -cakes stall for the hungry;
lucky dips and raffles for the gamblers; a make-up demonstration by a
leading cosmetics house for the ladies; and a grand sale of the most
glorious junk.
Then there were the kids; the dogs; the yarns of the DX that got away;
and the groups of technical boo's expounding pet theories.
Commercial gear was much in evidence but the antennae were
ingenious. G3CZA/M had a very lofty whip with what appeared to be a
midget basket -wound coil half way up. But perhaps the quaintest was
a two foot length of 16 gauge which fed directly into an "S" meter
clutched in the hand of an enthusiastic s.w.l, who promptly informed
all when the talk -in station was on the air. G3RVV reminisced on
receivers he built back in the old days, one of which was built breadboard style on a 9 -foot plank of wood!
REMOTE CONTROLLED TRANSMITTING STATION
Low Voltage Neon Indicator
I NOTE that several readers have been
unable to obtain transistor types 25018
and XB121 as specified in my article "Low
Voltage Neon Indicator" in the June 1966
issue. I have succeeded in obtaining a small
stock of 2SO18's at 10s. each. Transistors
type XB121 are available from Henry's
Radio Ltd. at 10s. each.
A. J. Bassett.
28 Park Road,
Chorley, Lancashire.
588
Two 30kW, high frequency
mitters are to be installed at
at Ruiselede. They are fully
controlled over land lines
away.
Marconi Self -Tuning radio transBelgium's communications centre
automatic, and will be remotely
from a centre three kilometres
In this installation, any one of 235,000 different frequencies
at 100c/s steps in the range 4 to 27.5Mc/s can be se'ected from
the control station without manual intervention at the
transmitters.
This export order was awarded by the Belgian Posts and
Telegraphs Department through SAIT Electronics, Marconi's
Belgian Associates.
Ground Communications
... COMMENT
TAYLOR ASSEMBLY SHOP
I HAVE recently been conducting some
research on ground communication which,
I believe, will be of interest to many
readers.
Although the transmitter and receiver
earths should normally be orientated so
that they face each other, I have discovered
that, for good local communication, they
should be beamed in order to obtain a
good signal/noise ratio
the noise here
being mains hum. The useful transmitting
range for speech in my area, with transmitter earths 25 yd. apart and an output
of 4W; is about 300 yd., although the
soil conducts unusually well. Doubling the
transmitter power increases the range by
...
about 25 %.
M. J. Walsh.
Portsmouth,
Hampshire.
Coil Formers for the
Beginners' S.W.2
In order to meet increasing demands for their products,
Taylor Electrical Instruments Ltd. put into operation a 3 -point
plan. A training school was set up on the factory premises, new
jigs were designed and installed, and new assembly techniques
devised. The result has been highly successful in that delivery
times have been improved and production output increased by
three times, without occupying additional floor space.
ANTEX SOLDERING KIT
New from Antex Ltd., of Grosvenor House, Croydon, is a complete
Soldering Kit consisting of a durable and rigid plastic "tool -box" with
a lift-off "see-thro" cover, designed not only to keep everything to hand
but also to serve as an iron stand whilst the iron is in use. Contained in
-box" is an Antex Model CN 240 15W soldering iron, fitted
this
with a ,bin. nickel plated bit. Two spare interchangeable bits (hin.
and hin.) are also provided, with a reel of resin -cored solder, a cleaning
pad, and a handy heat sink for soldering up transistors etc. A useful
-to addition to the kit is a handy 36 -page illustrated booklet on
solder". Price is 49s. 6d. complete.
"THE ENGINEERS' DAY"
To encourage more young people to become engineers, the Government
has sponsored "The Engineers' Day" exhibition at the Science Museum,
South Kensington. Opening at 2 p.m. on November 18th, the exhibition
will run to January 14th and will be open from 10 a.m. to 6 p.m.
Mondays to Fridays and from 2.30 p.m. to 6 p.m. on Sundays. Graphic
displays, with films and lectures, have been designed to promote an
awareness of the importance and achievements of engineers and
technologists.
Over 7,000 sq.ft. on the ground floor of the Science Museum have
been given up to this exhibition. The installation at Goonhilly Down
(Britain's ground satellite receiving station) will be featured.
IN relation to the Short Wave Receiver
for the Beginner (PRACTICAL WIRELESS,
July 1966 issue, page 182) Eddystone
inform me that coil former type 538
specified for two of the three coils, is no
longer available.
I have found that type B37 may be used
for all three coils if a little patience is
exercised.
A. White.
Oxton,
Birkenhead.
The R1155
WITH reference to the letter from John
Tye inferring that enough has been written
about the R1155 receiver, I would like to
point out, we have not all been able to get
back numbers of the magazines he mentions, which had articles on this receiver, i.e.
noise limiter circuit. I endorse Mr. R. E.
Robinson's cry for further articles on the.
R1155 or a reprint of "10 metre Converter"
or "Noise Limiter" for this well tried set.
Perhaps Mr. Tye would be willing to
loan his back numbers to people interested
in this receiver?
I would be willing to get the pages
copied.
A. R. Preston.
16 Millard House,
Grove Street,
Deptford,
London, S.E.8.
The "Ten -Five" Receiver
IN the list of components for the
modified "Ten -Five" Receiver appearing in the September issue of PRACTICAL
WIRELESS the specification for T4 was
omitted. T4 should be a miniature transistor -type transformer, Denco, Range 2
(Red).
589
the M and S signals after the carrier
has been added and the signal demodulated. The matrix then delivers the
audio signals in channels A and B, as
already explained. It should be noted
here that the matrix diodes have a d.c.
return path through the resistors shunting the A and B amplifier inputs.
It is usual practice for the A and B
outputs at the matrix to be fed to voltage
amplifiers (another double -triode valve
-one triode per channel-is commonly
employed) before being applied to
the input of the main stereo amplifier
system, and it is in this early audio
section that de -emphasis is often applied.
Transistor Decoder
A transistor decoder circuit, based
Fig. 9. Stereo
on the Bang and Olufsen Beomaster
This has
1000, is given in Fig. 8.
much in common with the valve circuit in terms of
operation. Tr1 and Tr2, are signal amplifiers, the first
in common -emitter mode and the second in common collector mode, the equivalent of the valve cathode follower. Stabilising feedback is applied between Tr2
emitter and Trl base, via the 120k S2 resistor.
The M signal and the sidebands of the S signal are
passed to the tap on the secondary of the matrix
transformer T1, via the RC filter (18kS2 in parallel
with 0.04.F). The 19kc/s pilot carrier signal is tuned
by filter Fl in the bass circuit of Tr3 and by F2 in the
collector circuit. Tr4 acts as a frequency doubler, the
38kc/s sub -carrier signal being tuned by T1 primary
in Tr4 collector circuit. The operation of the synchronous detector/matrix is the same as explained in
the valve circuit.
Critical Demands
To recapitulate; we have seen that any reasonable
quality fan. tuner can be coupled to a stereo decoder to
provide A and B (left- and right-hand) stereo signals
provided first the de-emphasis filter across the output
of the f.m. detector is removed and that de -emphasis is
inserted in each stereo channel subsequent to the
decoding process.
It should be noted, though, that while some features
of design or performance of the tuner may be acceptable
for mono, there are certain critical demands for good
quality stereo reception. For example, the tuner should
be capable of maintaining a linear frequency response
up to at least 240kc/s. In some cases it may be necessary
to modify the f.m. detector a little to secure the best
results. The total d.c. load of a ratio detector (i.e.,
R1 -I- R2 in Fig. 4) should not be much greater than
20k0, while the effective capacitance in parallel with
the i.f. signal at the detector should not rise much
above 250pF.
Poor overall frequency response or bad phase
characteristics of the parent tuner can cause the output
of the A channel to appear in the B channel, and vice
versa (this is called crosstalk). The alignment of the:
discriminator transformer is also important from this
A
A
4-7k..R
Common
47kR
590
O.001jF
0001p F
Fig. 10. A and B channel
de -emphasis.
tuner undergoing oscilloscope/wobbulator alignment.
aspect and to ensure that correct detector synchronisation occurs. If possible, alignment is best checked with
an oscilloscope and wobbulator.
Setting Up
Finally, a word about the setting up of a decoder.
The output A and B channels usually need to feed
through a triode or transistor amplifier to raise the
signal levels sufficiently to work into, say, the radio
inputs of a hi-fi stereo amplifier or into the audio
section of a high quality radio or radiogram. The
de -emphasis should also be remembered, and Fig. 10
shows a suitable twin -channel de -emphasis circuit for
connection to the outputs of a decoder.
Incidentally, the 19kc/s or 38kc/s signal developed
in the decoder when a stereo transmission is tuned in is
Often fed to some form of stereo indicating device.
With a decoder having reverse compatibility, this then
enables the user quickly to tune over Band II in search
of a stereo transmission. The indicating device can be a
moving -coil meter movement, a magic -eye tuning
indicator or even a bulb.
The magic-eye tuning indicator is probably the
easiest device to use, since the signal level at points
marked 'A' in Figs. 7 and 8 is adequate to give full
deflection of the shadow. To operate a meter the signal
would have to be rectified and amplified in a valve or
transistor to provide sufficient pointer deflection.
Coil Winding
For readers wishing to experiment with decoders and
construct their own models, the following information
for the winding of 19kc/s and 38kc/s coils and transformers will be of assistance.
To secure sufficient inductance and Q, the coils
should be wound on pot -type cores, such as the Muilard
Vinkor LA2505 or equivalent. About 1,500 turns of
45 s.w.g. enamelled-covered wire will tune over 19kc/s
with about 220pF in parallel. Tapping in to get the
correct impedance coupling necessitates making a
connection about 25 per cent from the `cold' or earthy
end of the winding.
To tune 38kc,/s the primary of the matrix transformer
should contain about 700 turns of 45 s.w.g. enamelled covered wire tuned by 150pF, while the secondary to
feed the diodes should contain about 100 turns. The
exact tapping points will depend on the nature of the
circuit, of course.
PEAK SOUND
WHAT
EVERY
CONSTRUCTOR,
EXPERIMENTER
AND
DESIGNER
SHOULD
HAVE
THE NEW WONDER CIRCUIT SYSTEM
for making your
own
INSTANT
circuits
DO ALL
FROM
YOU
WANT
A
PRINTED
CIRCUIT
Think what it means to be able to have just ONE printed circuit to the
designyou want and you will see immediatelyjusthowwonderfullyClR-KIT
more than fills that long felt need. CM -KIT is quick-you simply lay the
self-adhesive strip on the board, drill holes for the components and you are
ready to solderthem in at once. CIR -KIT is clean-there are no chemicals,
acids or etching processes involved. CIR-KIT is adaptable-you can
amend a circuit again and again quickly and easily. Ideal for experimenters,
this. CIR -KIT is economical-the No.3 Constructors' Kit advertised here
contains enough material to make up about 10 circuits, and components
may be closely mounted if desired. You can also repair damaged conventional printed circuits; you can experiment quickly and cheaply. In
fact, CIR -KIT is the most revolutionary advance in circuit techniques
since the printed circuit itself was invented and is already being used
by many of the most famous houses in electronics.
NO
This is Kit No. 3 complete with instructions, board
and material in sealed polythene pack ready for
immediate use.
Price t51
CHEMICALS, ETCHING
HEAT, SPECIAL TOOLS OR
RESTRICTIONS to LAY-OUT
Enough for about
ten circuits
CIR -KIT KIT No. 3 contains high quality mounting board
(Bakelite laminate E.10) size 6" x 12", 4" x 6" CIR -KIT special
adhesive copper sheet and 15ft. of á" CIR-KIT special adhesive
copper strip. Land areas and special shapes are cut from the
CIR -KIT sheet. The heat -resistant adhesive used will last
indefinitely with normal use even if you strip and remount
your CIRCUIT. With full instructions.
1
PROFESSIONAL
IN EVERY WAY
Lay the strip and land
drill holes for
the components and
your circuit is ready
for the components.
Nothing
could
be
simpler,
yet
the
result is 100% professional.
areas,
if you prefer
Please quote Dept. PW.12
PEAK SOUND (HARROW) LTD;;°
10, ASHER DRIVE,
ASCOT, BERKSHIRE
Phone W/NKFIELD ROW 3217, STD Code OEH47
Distributors to the Wholesale and Retail Radio Trade in the U.K.
To PEAK SOUND (HARROW)
Please send
LTD.,
10
Asher Drive, Ascot, Berks.
CIR-KIT(s) for which
I
enclose
NAME
ADDRESS
TECHNICAL SUPPLIERS LTD.
63, GOLDHAWK ROAD, LONDON, W12
Phone 603-2581:
not to cut coupon out.
NIN
603-4794
BLOCK LETTERS PLEASE
P
W.12
591
SOLDERING INSTRUMENTS
With re -styled moulded nylon handles
SEVEN SIZES from 10 WATTS to 55 WATTS
REPLACEABLE BITS, COPPER
Et
PERMATIP
EXCELLENT TEMPERATURE REGULATION
COOL, UNBREAKABLE HANDLE
RAPID HEATING
SIMPLE SERVICING
ALL VOLTAGES
.
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LOW COST
3
t
"
LITESOLD
instruments
are compact and
nicely balanced. Bits
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removal. Copper bits are standard; in sizes from 32" to 32" dia
PERMATIP bits are slightly slower,
t
but eliminate bit face wear LITESOLD
elements are encased in specially pre -oxidised
wire for constant temperature regulation from
new-less glamour but honest design, also apparent
in the simple, unbreakable handle, with the element unit
secured by two self -tapping screws (servicing couldn't be
easier) and firm, spring -on clip. LITESOLD hollow -spindle
construction prevents heat loss into the handle (which DOES
stay cool) and improves performance Useful LITESOLD accessories
include HEAT GUARDS for elements, and BENCH STANDS.
r
e:"
Ask for the new colour catalogue SP11. Free
LIGHT SOLDERING DEVELOPMENTS LTD.
28, Sydenham Road, Croydon, Surrey
4-S
TION INTERCOM
%/
x£61916
SUB
Solve your c mmunication problems with this
4 -station Transistor Intercom (1 master and
Subs), in de -luxe plastic cabinets for desk or wall
mounting. Call/talk/listen from Master to Subs and
Subs to Master. Ideally suitable for Business, Surgery, Schools, Hospital, Office and Home. Operates
new
3
on one 9v battery. On/off switch. Volume control.
Complete with 3 connecting wires each 66ft. and
other accessories. P. & P. 4/6.
I
NTERÇUM%BABYALARM
Telephone: CROydon 8589 and 4559
SLEEP LEARNING
Make use of your tape recorder to learn scripts,
languages, songs, speeches etc. etc. the modern
way.
Send S.A.E. for details and price list of time
switches, pillow speakers, tapes and complete
sleep learning outfits
H.A.C.
SHORT-WAVE
KITS
NEW RELEASE: MODEL
"DX"
MAINS POWER PACKS
The ideal economical and safe way of running
any Transistor Radio, Record Player, Tape
Recorder, Amplifier etc. from A.C. Mains.
The MAJOR " Power Plus " for 9v.;
6v.; 4fv.; Single Output. P. & P. 2/6
For 9v, + 9v.; 6v. + 6v.; 41-v. + p
4,ßv. Two separate outputs. P. & P. 2/6 42/6
Please state outputs required
The BIJOU " Power Plus ". For the smaller
set using PP3 type battery. Supplied complete
with special adaptor enabling you to reactivate
your existing PP3 type battery.
q 7/6
396
1
Y
P. & P. 2/6
All units are completely isolated from mains by
double wound transformer ensuring 100
safety.
Modernise business or home with this new two-way
Portable Transistor Intercom. Consisting of Master
and Sub, in strong plastic cabinets, with chromium
stands. Designed as a two-way instant communication system. Call/talk/listen from Master to Sub and
Sub to Master. Operates on one 9V battery.
Complete with 60 ft. wire. Battery 2/6.P. & P. 2/6.
LISTEN TO THE WORLD on TELSTAR our
1
-VALVE
SHORT WAVE
RADIO
7ransistareLE0HPt11fÀloLLfeR
Why not boost business efficiency with this incredible
De -luxe Telephone Amplifier. Take down long
telephone messages or converse without holding the
handset. A status symbol? Yes, but very useful one.
On/off switch. Volume Control. Operates on
9V battery. P. & P. 2/6. Battery 2/6 extra. Full
price refunded if returned in 7 days.
WEST LONDON DIRECT SUPPLIES (PW/12)
189 KENSINGTON NIGH STREET, LONDON, WS.
592
Receives speech
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world. Price includes valve and one coil covering
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metres, Can be converted to 2 or 3 valve and allmains speaker use.
35_
Total building costs
P. & P. 2/All parts available separately.
R.C.S. PRODUCTS (RADIO) LTD.
(Dept.
P.W.).
11
Oliver Road, London,
E.17
Famous for over 30 years for Short -Wave Equipment of quality, H.A.C." were the original
suppliers of Short -Wave Receiver Kits for the
amateur constructor. Over 10,000 satisfied
customers-including Technical Colleges, Hospitals, Public Schools. R.A.F., Army, Hams, etc.
IMPROVED 1967 RANGE
One-valve model "D%", complete kit-price 56/6
(Post 3/6).
Customers say: "Definitely the best one valve
S.W. Kit available at any price." This kit contains
all genuine short-wave components, drilled
chassis, valve, accessories and full instructions.
Ready to assemble, and of course, as all our
products-fully guaranteed. Full range of other
kits still available, including the famous model
"K". Before ordering, call and inspect an assembled
receiver,-or send for a descriptive catalogue and
order form to:-
"H. A. C." SHORT-WAVE PRODUCTS
29 Old Bond Street, London W.1
ON THE
BrE
MONTHLY NEWS FOR DX LISTENERS
THE BROADCAST BANDS
CONSIDERABLE increase in sunspot activity has
been noted at times with complete blackout of
h.f. channel on occasions. This means that
better things are just around the corner as the higher
frequency bands become more and more used. The
move of the high-powered transmitters to these
bands will considerably relieve overcrowding on the
lower frequency bands and give the lower-powered
stations a chance.
SOUTH AMERICA
Argentina: Radio National (Ayacucho 1556,
Buenos Aires) is reported to be using LRA33, 15,345
until after 2300 in Spanish.
Brazil: Radio Clube de Pernambuco, (Avenida
Cruz Cabuga 394, Recife) often heard on 11,865 is
now audible also at 2220 on 6,015). Radio Jornal do
Comercio (Rua Marquez do Recife) now puts in a
very strong signal on 15,145 after 0030.
Radiodifusora Sao Paulo (Casilla Postale 252,
4142, Sao Paulo) seems to be carrying the programme of Radio Tupi over 17,817. Strong heterodyne with Radio Canado on 17,820.
Radio Clube Ribeirao Preto (Casilla Postale 18,
Ribeirao Preto) now putting in good signal after
2230 on 15,415. Radio Sociedad de Babia (Rua
Carlos Gomes, 57, Salvador) is back on 11,875. At
2300 there is interference from Radio Moscow.
Chile: Radio President Balmaceda (Casilla 13650,
Santiago) is audible with frequent identification
2245-2301 when blotted out by Vladivostock relaying Radio Moscow.
Colombia: Radio Nacional (Apartado Nacional,
1824, Borgota) heard on the new frequency of
15,345 around 0100. Programmes in the main were
transcription features of other stations.
Ecuador: La Voz de los Andes (Casilla 691
Quito) uses 15,325/17,880 to Europe 1830-2200 and
15,115/17,890 from 2330-2400.
Venezuela: Radio Barquisimeto (Apartmentado
576, Barquisimeto) gives a good signal from 0000
onwards on YVMQ 4,990. Radio Tropical (San
Jacinto 9, Caracas) heard after 0025 over YVKP
4,870. Music, advertisements and news make up
programme.
EUROPE
Albania: Radiodiflusion et Television Attanaise
(Rue Ismail Quemal, Tirana) now has a QSL card.
Some reports say the 0630-0700 English transmission is aired over 7,090/7,265 whilst others give the
frequencies as 7,265/9,390.
GUTTRIDGE
by JOHN
Denmark: Radio Denmark (Radiohouse, Rosenornsalle 22, Copenhagen V) has a special musical
transmission 1800-1845 over long wave 245 (kc).
There is English 1825-1830 and reports are wanted.
France: O.R.T.F. (Maison de l'O.R.T.F., 116
Avenue du President Kennedy, Paris 16) now has
English at 1300-1330 over 15,245/17,740/21,580 and
1915-1930 over 15,130/17,740. The French inter
programme is relayed on the following frequencies
6,175 1100-2200, 11,845/11,920, 1545-2000, 15,245
1100-1200,
1400-1700.
1100-1230,
17,765
21,580
1100-1230,
German Federal Republic: Deutsche Welle (Bruedertsrasse 1, Postfach 344, Skoln) has made changes
in the following English transmissions 0300-0340
11,945/9,530; 0845-0940 11,925/15,275/17,845; 06000630 11,775/15,295; 1045-1055 9,765/11,905; 01300250 6,075/9,640; 0500-0540 15,140/9,735; 2050-2100
9,700 / 11,925 / 15,405.
Deutsche Bundepost (Funkampt Hamburg, Funkdienstburo, Hamburg 13, Schlüterstrasse 3) has a
SSB point-to-point transmission over DGT46 19,460
at 1420. QSL verification is given.
Great Britain: BBC (C.E.X.B., Bush House, London, W.C.2) has been heard carrying its 2000-2100
Russian transmission in SSB over 12,185.
Greece: National Hellenic Broadcasting Institute
(Mourouzi Street 16, Athens) can be heard (with
patience) at 2200-2230 and 2300-2330 over 15,345/
11,720.
Holland: Radio Nederland Wereldomroep (P.O.
Box 22, Hilversum). The 2100-2150 English transmission is now aired over 11,730 and on frequency
in the 31 m.b.-probably 9,590.
Norway: Radio Norway (Oslo) now transmits as
follows: 0300-0430 9,550/9,610/11,850/1,578; 07450815 21,670/11,850/15,175/17,825/25,900; 1100-1230
7,240/21,670/15,175/17,825/25,900; 1300-1430, 15001630, 1700-1830 21,670/15,175/17,825/25,900; 19002030 11,850/15,175/17,825/21,670/21,730; 2100-2230
11,850/15,175/17,825; 2300-0030 11,850/9,550/9,610.
The use of the 11 m.b. should be noted here.
Portugal: Radio Portugal (Rua du Quelhas 21,
Lisboa) reported to be using 7,225/21,495 for its
2015-2100 English transmission to Europe although
schedule says 41 and 49 m.b. are used.
*
*
*
Contributors this month were P. Charlton, A. B.
Thompson, S. Shaw, M. C. Donnelly, D. Rye, D.
Priestley, Swiss Broadcasting Corporation and Radio
Nederland.
593
THE AMATEUR BANDS
by DAVID GIBSON,
VERITABLE deluge of logs, letters and
reports have arrived from just about everywhere. The majority-7Mc/s. Some of the
reports on forty are extremely good and as can be
seen by the logs shown later-the DX is most
definitely there for those who can be bothered to
David Griffiths (Cardiff), 640 plus 4 r.f. stages
(why bother with the 640 OM?), 100ft. 1.w., 14Mc/s
s.s.b.: CR-6HF, 6IV, CR7-AP, FM, GW, EL2R,
EP2PL, FH8KD, HS4AK, JA -IBN, 2BQE, 3RQ,
3UE, 5RG, 6AD, KG6CF, KG6ALW, KH6BX,
KH6BJ, KL7-BTP, FCH, FEF, FIL, KM6CE,
KR6HW, KR6QW, KS6BT, KZ5EX, K1VSD/AM,
UH8DE, VE-2DZ, 8AA. VE1AED/SU, VE2BUJ/
SU, VK3EUU, VK9VK, VP2VV, VP3HAG,
VPSRB, VS9OC, VS9ARV, WQOTP, WOGTA/8F4,
W6KXZ, YA1DAN, YVSBNW, ZC4JU, ZD9BE,
ZL1CR, ZL4CH, ZPSOG, 4U1ITU, 4X4BL, 5A4TR,
9H1AB, 9M2LO, 9V1MY. An extremely good log,
set out in alphabetical order with the date, time,
RST, mode, band, etc. Interesting from this log to
see that even the ZL's were 5 and 5.
Philip Cooper (Uttoxeter), CR45 t.r.f., 70ft. l.w.,
managed CN8CS, EP2AX, F9RY, HP9FC/MM,
I1AUM/M1, K1HRV/MM, KIVKD/P/KG6, K6
JXS/MM, KR6KS, KR6UL, KV4CF, MIB, OD5BZ,
PY2DFS, SVOWX, VE1AAH, VE2BUJ/P/SU,
VE8AG, VK3-MO, TL, ZL, W7ALE/Fix. P/KG6,
XW8AY, YV5CHO, ZL3MM, ZS6XL, 5A3TW,
5A5TB, 601AW, 7Q7LC.
D. Harvey (Salop), PCR3, ground-plane hunted
21Mc/s for-CN8FB, CR7FG, CT2AC, CX5AAM,
CXOLE, EA8ES, HR1JKM, Ki, 2, 3, 4, LU4LG,
OD5EC, PY2GKD, PY9AI, SL7ZZS, SV1AC,
VE2BUJ/MM/SU, VE3BIF, Wi, 2, 3, 7, 8, 9, 0.
Paul Baker (Pontypool), HE30, 45ft. 1.w.
21Mc/s-CE5MEO, dozens of CN's, CO8RA,
CR7's, CT5JAS (ex G3SJ), CX5AAN, EA8CR,
EAOAY, EL2AA, EP2RJ, HK4TA, many JA's,
K6BNL, LUIDJO, MP4BEU, OA4DJ, OD5BZ,
PX1MA, PY's, PZ1BE, SM3DJU/MM, VE2BUJ/SU,
SU1IM, TL8JF, TN8BK, UA9TT, VE8BZ, VP7NA,
VS9ASP, W6YAW, WA6LDG, WB6DLA, W7LUN,
ZC4MO, ZE6JL, ZS1JQ, 4X4QA, SA1TK, 5H3JL,
5N2AAW, 6W8DD, 6Y5RS, 7XOBB, 9G1FV,
9H1R, 9L1TL, 9M2FI (Penang Is.), 9QSFV, 9V1MT.
listen.
Very few tried 3.5Mc/s, and only two listened on
160 in spite of the fact that W's are active down
the 1.f. end.
From the h.f. end comes news of great activity.
Both 14 and 21 Mc/s have been quite fantastic at
times but reports are now growing on 28Mc/s. One
particularly good opening on ten metres showed just
a quick preview of things to come, things like
Argentine, Canal Zone, South Africa, Israel, all on
phone.
Seven Meg. Souffle
No, you don't need a beam! N. Henbrey (Rye),
20 -metre dipole
and an EA12 logged CN8AW,
UC2BF, VK2AVA, VP6KL, VS9ARV, VS9OC,
WA4YOJ/P/4 (0557), 5A2TZ. R. Adair (Co. Down),
R107, dipole, UW9AS, VK2AVA, VP3JR, VP6KL,
VS9ARV, ZB2AJ, 4X4VL, 9M20V.
J. Fitzgerald (Great Missenden) uses a Hitachi
WH837 portable with another BC set as a b.f.o. This
set up harvested the following: CN8AW, EL2A,
JA1AEA, JA2BAY, LX1BB, MP4MAW, OD5BZ,
PY's 1CAD, 1CLI, 1CNK, 2DL, 2EAD, 6WA,
7AOT, 7LAK (all between 2052 and 2395);
UA1WW, UB5UW, UW9AF, VK2AVA, VP3JR,
VP6KL, ZB2AJ, ZS1JA (2312),5A2TR, 606BW,
9HIR, 9M2OV (2316). All s.s.b. Times for above
three logs all between 1928-2143 except where
stated otherwise.
D. Allisett (Gúrnsey, C.I.), TCS receiver, 120ft.
1.w., heard CT1LX, JA2BOI, OX3LP, PY4ND,
VK2AVA, VK3VJ, ZB2AJ. G. Morgan (Tredegar),
HA230 tuned to 7050kc/s, 45ft. end fed, all s.s.b.
-CN8AW, HB9AHL, LAIK, OH5MW, PY's 1CLI,
2EAB, 6WA, 7APS, 8QQ; SL6BH, UW9AF, VK's
2EQ, 2AVA, 3MO, 7SM (Tasmania); VP3JR,
VP3YG, VP6KL, VS9OC, 9H1R, 9R4VT, all on a
loudspeaker, too!
Twenty and Fifteen
If it's alive and it radiates, then you'll find it on
one of these two bands. R. Wells (St. Albans)
reports hordes of JA's romping in, and other s.w. l' s
quote similar instances of intense activity from
distant climes.
R. Dowdell (Ewell), "52 rx. soon to be replaced
with 130ft. end fed wire, running NW/SE.
Coo!
they must be coming in strong! 14Mc/s s.s.b.:
CR6CN, EA8AH, EP2GF, ET3WH, HS1AK,
KH6EN, KR6UA, LU5AES, PY2DSQ, VK3ZL,
VS9OC, YA1DAN, YKIAA, YV5CIV, ZD9BE,
ZS6AR, 5A2TS, 5ASTV, 5N2AAW, 5Z4IR, 9G1FF,
9J2MM, 9M2B0, 9M2DW, 9Q5HF, 9U5BB,
9X5MH.
594
G3JDG
Sunspot Special
Were you disappointed with 28Mc/s this month
or did you hear mumblings from distant mikes?
Pat Longbone and John Singleton use a modified
S640, 20m. dipole-GM5ABN/KP4PRY, LA8WI,
OE6UX, ZS6AJH. John Farrer (Bishop's Stortford),
Mini - clipper, ground - plane-CT1PQ, DL8MM,
DJ8OD, EA8EV (Canary Is.), EL8B, many G's,
ZC4GB, ZE1AA, ZE8JJ, ZS4OI, ZS6-DK, DLW,
IW, JK, IB, 5N2AAM, 9J2DT, 9J2MM.
G. Owen (Bristol), Mohican, Joystick, 28Mc/s a.m.
CT1-OW, PT, QL, CR6EF, CX2CN, EA7DG,
IIFAE, KV5VF, LU1AAB, OZ4FF, PY-1BAV,
3BSB, 4AB, 7EC, ZE2JA, ZE3JO, 5X5JK. On s.s.b.
he claims CE3PR, CX-2AAJ, 2BD, 9CO, DJ1OJ,
DJ7LY, DJ8LD, EL2R, HIIJMN, KP4AXC,
_
KZ5KW,
PY1CK,
PY2PA,
PY3BKT,
PY4CT,
-continued on page
610
POST
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'
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With IICL82 triode pentode valve and.
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£8. 9.6
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401
£29.19.6
Teak Wood Base WB 1 Takes
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72/6
Q MAX CHASSIS CUTTER
Complete: a die, a punch, an Allen screw and key
tin.
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14/6
14/9
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22/6
34/3
37/9
44/3
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BARGAIN XTAL PICK-UP ARM Complete with
ACOS LP -78 Turnover Head and Styli 20/-; Stereo 80/,
SPEAKER FRET Tygan various Dolours, 52ín, wide from
101- ft.; 28in. wide from 5/- ft. Samples S.A.E.
EXPANDED METAL Gold or Silver 12 x 12in. 6/-.
NEW GARRARD GRAM MOTORS 100-130v. A.C. 15/ -
pair for 200/250v. (in series), or 10/- each (Post Free).
FULL WAVE BRIDGE SELENIUM RECTIFIERS:
2, 6 or 12 v. outputs, 18 amp., 8/9; 2 a. 1113; 4 a., 17/8.
CHARGER TRANSFORMERS. Tapped input200/250 v.
for charging at 2, 6 or 12 v., 14 amps., 15/8; 2 amps., 17/6;
4 amps., 25/-. Circuit included. Amp meter 5 amp., 10/6.
MOVING
COIL
MULTIMETER
TK
25.
0-1,000 v. A.C./D.C., ohms 0 to 100k. etc.
MOVING
COIL
MULTIMETER
EP1OK.
0-1,000 v. A.C./D.C., ohms 0 to 8 meg. ete.,
MOVING
COIL
MULTIMETER
EP20K.
0-2,500 v. D.C. 20,000 ohms per volt. 0-1,000 v. A.C.
Ohms 0 to 6 meg. 50 Microamps full scale.
18/600 v.
12/8
18+18/500 v.
7/6
8+8/450 v. 3/6 32+32/450 v. 6/8+16/450 v. 3/9 50+501350 v.
7/16+16/450 v. 4/3 84+100/350v. 1118
32+82/350 v. 418 100+200/275,7.12/6
E.H.T. CONDENSERS. 0.001mfd., 7kV., 6/6; 20kV., 1016.
SUB -MIN. ELECTROLYTICS. 1, 2,1 5, 8, 18, 25, 30, 50,100,
250m1d. 15v., 2/6; 500, 1000mfd. 15v., 3/6; 2,000mfd. 25v.,
7/-. CERAMIC 500v. 1 PF. to 0.01mfd., 9d.
PULSE CERAMICS 10 pF to 180 pF., 12 kV., 2/8.
SILVER MICA. Close tolerance (plus or minus a PF.), 5 to
47 PF.,1/-; ditto 1% 50 to 800 p0.1/-;1,00010 5,000 PF., 2/-.
TWIN GANG. "0-0" 208 pF.+178 pF., 10/0; 365 pF., miniature, 10/-; 500 pF. standard with trimmers, 9/-; 5002F
midget less trimmers, 7/61500 pF. slow motion, standard 9/-;
small 3 -gang 500 pF. 18/8. Single "0" 365 PF. 7/6.
SHORT WAVE. Single 10 pF., 25 pF., 50 PF., 75 PF.,
100 PF., 180 pF., 5/8 each. Can be ganged. Couplers 9d. each.
TUNING. Solid dielectric. 100 PF., 300 PF., 500 pF., 3/6 each.
TRIMMERS. Compression ceramic 30, 50, 70 pF., 9d.;
100 PF., 150 PF., 1/3; 250 pF., 1/6; 800 PF., 750 pF., 1/9.
BEST BRITISH PVC RECORDING TAPES
L.P. lin. 1800ft
1916 D.P. lin. 2400ft
29/6
L.P. Olin. 12O01í.....14/8 D.P. 51in. 1800ft
24/6
L.P. 5in. 900ft.
11/6 D.P. 5in. 120010. ...18/6
Spare Spools 2/8. Tape Splicer 5/-. Leader Tape 4/8.
Tape Heads: Collars 2 track 28/6 pair. B.S.R. 4 track 10/-.
MAINS TRANSFORMERS
2/ó7t
250-0-250, 80 mA, 8.8 v. 8.5 a. Rectifier 6.3 v.....25/ la or 5 v. 2 a.; Ditto 350-0-850
29/6
MT.510300-0800 v.120 mA, 8.3 v. 4 a
29/8'
MINIATURE 200 v. 20 mA., 8.8 v.1 a
10/8
MIDGET 220 v. 45 mA., 8.8 v. 2 a.
15/6
SMALL 800-0-800 v. 70 mA., 6.3 v. 4 a
19/8
HEATER TRANS. 8.8 v. la a., 7/6.6.3 v. 4 a
10/8
Ditto tapped sec. 1.4 v., 2, 8, 4, 5, 8.3 v. 1a amp
1016
GENERAL PURPOSE LOW VOLTAGE. Outputs 8, 4, 5,
8, 8, 9, 10, 12, 15, 18, 24 and 30 v. at 2 a
25/Ditto, 1 amp., 5, 10, 15, 20, 25, 30, 40, 45, 50, 55, 80 29/6
AUTO TRANSFORMERS 0-115-280 volt Input/Output
80 w. 18/8; 150w 25/-; 500 w. 82/6.
,
CRYSTAL MIKE INSERTS
1a x fin. 8/8; ACOS 1f x fin. 8/8; 89/1
TANNOY CARBON HIKE with Switch
MOVING COIL HEADPHONES 100 ohms
(Slightly soiled but guaranteed).
1966 GRAM
m-X.r,.::"
CHASSIS
i x fm.
,aA
12/6
5/8
1216.
£10.10.
;.<
47/6
79/6
^n
NEW MULLARD TRANSISTORS
8/-; 0072 7/6; OCS1D 7/8; OCR 7/8; AF115 10/8;
AF114 11/-; 0044 8/-; OC45 8/-; OC171 9/-; 00170 8/6;
AF117 9/6. 00261216; Transistor Holders 1/3.
VALVE HOLDERS. BAN Bd. MOULDED Int. Oct. Od.
Mazda Oct. 6d.; BIG, BOA, B8á, BOA, 9d.; B7G with can
1/6. BOA with can 1/9. Ceramic OCTAL, EF50, BIG
BOA, 1/-. Valve base plugs BIG, BOA, Int. Oct., 2/8.
TRANSISTOR MAINS ELIMINATORS
Famous "Power -Mite" 9 volt. Same size as PP9
battery. Fully smoothed, full-wave circuit.
-
RA2W 8 in. Ferrite Aerial
with car aerial coil....1210
Ose. P50/lA0
5/4
470 k/cs LF.P50/2CC
5/7
8/Sed I.F. P50/30C
Volume Controls
45/.
Transistor Coils
Spare Cores
8d.
Driver Trans. LFDT4
0/6
Printed Circuit, PCA1 9/6
J.B. Tuning Gang
10/8
Weyrad Booklet
80
ohm
2/-
Coax 6d
yd.
spaced
Cable
Long spindles. Midget Size Semi -air
5 K. ohms to 2 Meg. LOG or 40 yd. 17/8. 60 yd. 25/-.
LIN. L/S 8/-. D.P. 5/, FRINGE
LOW LOSS.
Stereo L/S 10/6. D.P. 14/6.. I
5 lines.
yd. 1/6
COAXIAL PLUG 1/-. PANEL SOCKETS 1/-. LINE SOCKETS 21-. OUTLET BOXES, SURFACE OR FLUSH 418.
BALANCED TWIN FEEDERS 6d. yd., 80 or 800 ohms.
TELESCOPIC CHROME AERIAL. 12in. extends to 33in. 618.
TV REMOTE CONTROL
Three Wavebands:
Five Valves: ECH81.
Long., Med., Short.
EFSS, EBC81, EL84, EZ80,
12-mouth guarantee. A.C. 200-250 v. Ferrite Aerial
5 watts 3 ohms. Chassis 13ain. x lin. x 5in. dial size
13in. x 4in. Two Pilot Lamps. Four Knobs.
£10.10.
Aligned calibrated. Chasnsjisolated from mains,
-
HIGH GAIN TV. PRE -AMPLIFIER BAND I B.B.G.
Tunable channels 1 to 5. Gain 18 dB. ECC84 valve.
Kit price 32/6 or 55/- with power pack. Details 6d.
BAND III I.T.A.-same price. Tunable channels 7 to 13.
Band I or III. Coils and circuit only, 9/8. Chassis 4/9.
B.B.C.2Super Booster. UHF Transistor Model ready made 75/BLANK ALUMINIUM CHASSIS. 18 s.w.g. 4 sides, riveted
corners, lattice fixing holes, 2/in. sides, 7 x 4in., 5/8; 9 x lia.,
6/6; 11 x 8in. 6/8;11 x lin, 7/6;13 x gin. 9/6; 14 x llin.12/6;
15 x 14in., 15/,
ALUMINIUM PANELS 18 s.w.g. 12 x 12in. 5/8; 14 x gin.
4/8; 12x Sin. 3/6; 10 x hin. 2/9; 8 x bin. 2/-; 6 x 4in. 1/6.
STELLA RECORD PLAYER AMPLIFIER
4 watt, 2 stage. 8 to 7 ohm. Neg. feed back. IICL82, UY85.
200-250v. A.C. tapped input. Chassis size 8 x 24 x 4in. high.
Gold/Walnut knobs. Volume and Tone controls on separate
Polished Wood Panel Ox 2in. Brand new with
maker's guarantee. Bargain price. P. & P. 1/6. 78/6
ADD-ON BABY ALARM UNIT
All Transistor. For any make of TV or Radio. Only three
connections. Made by K.B., R.G.D. and Regentone. Circuit
provided and instructions for use with all makes. No
battery required. Ready built and guaranteed.
With microphone. Bargain price. Post tree.
30/
125A, 142A, 23TG111A, 113A,
121A, 131A. Stella ST1033A,
39A, 40A, 53A.
Casoar
CT1910A, 21A, CT2810A, 21A,
81A.
Philips Price 8 gns.
12/9
Post
Free
Includes lift.
Brand New.
7-way cable, Mallard 0A81
2 pots., 8 switches, 5 resistors.
Price
RETURN OF POST DESPATCH
Price
(State
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3
or 15 ohm)
CATALOGUE S.A.E.
GROUP MODELS FOR VOCALS
BASS, LEAD and RHYTHM GUITARS
80-10,000 cps. Voice Coils 15 ohms. Heavy duty.
'Group 25'
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25
5gns.
'Group 35' 'Group 50'
8igns. sów: 18gns.
35w:
LOUDSPEAKERS P.M. 3 OHMS. 28in., 3in., 4in., 5in.,
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12in. 30/-; (15 ohms 35/-); 10in x Oin. 22/6; Bin. x 5in. 21/-.
E.M.I. Double Cone 13; x Sin., 3 or 15 ohm models, 45/-.
Stentorian 10in. 11E1012, £5.10; Sin. HF812, £4.10; Crossover
85/-; Horn Tweeters 3-18 Ko/s. 10 w. 29/0; 20 w. 20 Kc/s.99/6.
JACK SOCKETS Std. open -circuit 218, close -circuit 4/0.
Chrome Lead Socket 7/6. DIN 3-pin 1/3; Lead 3/6.
Phono Plugs 1/-. Socket 1/-. Banana Plugs 1/-. Sockets 1/-.JACK PLUGS STANDARD. Chrome 8/-. DIN 3-pin 8/8,
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1 p. 12 -way or 4 p. 2 -way, or 4 p. 3 -way, 316 each.
Wavechange "MAKIN" 12. 12-way, 2 p. 6-way, 3 p. 4 -way,
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8 wafer, 19/6; 4 wafer, 24/-; 5 wafer, 28/6; extra wafers, 416.
TOGGLE SWITCHES, s.p. 2/-; d.p. 3/8; d.p.dt. 4/-.
SPEAKER FRET. Tygau various colours, 52in. wide Irons
10/- ft.; 28in. wide from 5/- ft. Samples, large, S.A.E.
EXPANDED METAL. Gold or Silver 12 x 12in. 8/,
AM TUNER MEDIUM WAVE Three Transistor Superhet.
Ready built. Printed circuit. Ferrite aerial.
Size 5a x 38 x lain. Ideal for Tape Recorders.
FM TUNER 88-108Mc/a. Six Transistor. Superhet. Ready
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Size 8 x 4 x 21in.
8 WATT QUALITY AMPLIFIER 4 Transistor.
Push-pull. Ready built: with volume control.
NEW MANUFACTURERS SURPLUS UHF BBC -2 AERIALS
BBC -2 Double Gold Ring Set Top Model
22/0
BBC -2 Five Element Loft Model
32/6
BBC -2 Five Element Outdoor Wall Mounting
4ß/fl
79/6.
£8
75/-
*
Leaflet S.A.E.
200/250 v. A.C.
5
10
15
watt,
watt
r i/6
0.5 to 8.2 ohm 3 w.
).
-
watt J
VIRE-WOUND RESISTORS
{ 1/9
10 ohms to 8,800 ohms
1112/-
15K,15K,20K,25K,10W.
MAINS DROPPERS. Midget. With sliders. 0.3 a.,
0.2 a., 1.2 K., 0.15 a., 1.5 K., 0.1 a., 2 K., 8/- each.
LINE CORD 100 ohms 1ï. twin plus resistance 1/- ft.
3/a
iK.,
ALL PURPOSE TRANSISTOR PRE -AMPLIFIER
14 db gain. 250v. or 9v. input. Ready built with Mu Metal
matching transformer for Mikes, Pick -Ups. Tuners 16/_
Instructions and circuit supplied. Post Free.
WIRE -WOUND 4 -WATT
WIRE -WOUND 3 -WATT
POTS.
Miniature T.V.
STANDARD SIZE POTS.
LONG SPINDLE VALUES
Values 10 ohms to 30K, 313.
Carbon 30 K, to 2 meg., 31-.
50 OHMS to 100 K, 716.
ARDENTE TRANSISTOR TRANSFORMERS
D3035, 7.3 CT : 1 Push Pull to 3 ohms for 0072, OCR ..11/03034, 1.75 : 1 CT. Push Pull Driver for OCIO, OCR 111113058, 11.5 : 1 Output to 8 ohms for 0072, 0281....111-
5'6
BULK TAPE
BRAND NEW QUALITY
EXTENSION LOUDSPEAKER
ERASER AND
RECORDING HEAD
DEMAGNETISER
RADIO BOORS (Postage 9d.)
Radio, TV Valves, Diodes, Transistor equivalents
10/8
High Fidelity Speaker Enclosures and Plans
5/ Transistor Superhet Commercial Receivers
718
Mallard Audio Amplifier Manual
816
Radio Valve Guide, Books 1, 2, 3, 4, or 5
each 5/ Practical Radio Inside Out
416
Transistor Audio Amplifier Manual
8/ Shortwave Transistor Receivers
5/ Transistor Communication Sets
81 International Radio Stations List
218
Modern Transistor Circuits, for Beginners
718
Sub -Miniature Transistor Receivers
5/ Wireless World Radio Valve Data
9/6
At a glance Valve equivalents
8/ RESISTORS. Preferred values, 10 ohms to 10 meg.
8w.,8w.,lw.,20% 4d.; 18w. 8d.; 2w. 1/-;8w.10%Bd.
HIGH STABILITY. a w. 1% 2/-. Preferred values.
10 ohms to 10 meg. Ditto 5%, 10 ohms to 22 meg. 9d.
C.R.T. BOOSTER TRANSFORMERS
THE INSTANT
T)3r)
1110111/11111
35/-
In tough cream plastic cabinet with 20ft.
lead and adaptors. For any transistor radio
intercom, mains radio, tape recorder, etc.
POST
3 to 15 ohm matching
FREE
Size: 73 x 51 x Sin.
30/_
Minimum P.P, Charge 116 unless otherwise stated. C.O.D. 5/- extra. Full List 11,
RADIO COMPONENTS SPECIALISTS
Written guarantee with every purchase.
Chassis Solid Aluminium, overall die. 1214n.
Overall depth.... 6 in.
for heater cathode short or failing emission. 25% and 50%
TUBE
BOOST.
input.
TAGE REQUIRED.
or 6or 13v.
PRIC 1
For Philips 19TG111A, 121A,
Our
The only Hi Fi Speaker
available with choice
of 3 or 15 ohm models.
May be used with any
Hi Fi or domestic
sound equipment.
Max. Power.. 15 watts
Bass Res...40/50 cps.
Flux.. 12,000 gauss.
Voice Coil....11 in.
Response, 45-13,000
*
.99
OC71
WEYRAD P50
BAKER 12 in. STALWART
CAN TYPES
aPs.
YOURSELF
As
ELECTROLYTICS FAMOUS
TUBULAR
2/350 v. .. 2/8
4/350 v. .. 2/3
8/450 v. .. 213
18/450 v. .. 3/32/450 v. .. 8/9
25/25 v. .. 119
50/50 v. .. 2/ -
PAPER TUBULARS
350v.-0.1 9d., 0.51 9;1 mid. 3/-; 2 mfd.150v.3/-.
5007.-0.001 to 0.05 94.; 0.1 1/-; 0.25 1/6; 0.5 3/-.
1,000v.-0.001, 0.0022, 0.0047, 0.01, 0.02, 1/6; 0.047, 0.1 2/6,
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337 WHITEHORSE ROAD, WEST CROYDON
Buses 133, 68 pass door,
S.R. Stn. Selhurst.
Tel: THO
1665.
595
KEDOCO
TUNER -AMPLIFIERS
WITH
Adams-Norken
THERE IS AN ADAMS -KORKEN'
SOLID STATE MODULE TO SUIT
ANY HI -FIOR TAPE REQUIREMENT
STEREO RADIO
227M MONO TUNER -AMPLIFIER
(illustrated)
127 STEREO TUNER -AMPLIFIER
(excluding stereo radio decoder)
127M MONO TUNER -AMPLIFIER
OPTIONAL CASE teak and vinyl hide
£40
1
6
£40
1
6
£29 18
9
0
£3 10
Three tuner -amplifiers, identical in size and similar
in styling, each with the same high performance
AM -FM Tuner incorporated.
The 227M provides 10 watts power output whilst
the 127M, with 5 watts output, is designed for those
whose power requirements are more modest.
The 127 is the stereo version of 127M, having two
amplifiers, each of 5 watts output.
All three have similar facilities; pickup and tape
inputs, tape recording output, bass and treble tone
controls.
M5 STEREO RADIO DECODER
£14 10 0
Enabling any of our current stereo tuner -amplifiers
and tuners to receive the BBC's new stereo
broadcasts.
For full details and technical specifications of all
models, plus list of stockists, post coupon or write
mentioning 12 PW66.
The photograph illustrates three modules from our range,
three main amplifiers, fully transistorised, providing a choice
of power from normal domestic listening to P.A. systems.
20/24 20 watts at £6.19.0. 12/12 12 watts, £4.9.0. 6/12 4
watts £3.9.0.
LEADERSHIP IN SOLID
TECHNOLOGY
STATE
ARMSTRONG AUDIO LTD
WARLTERS ROAD, LONDON N7
telephone North 3213
NAM E
ADDRESS
Send 9d. to cover cost of postage for illustrated brochure describing
in detail the Adams-Norken system and giving specifications, circuits
etc., of the whole range.
KEDOCO ELECTRONICS
Subsidiary of Adams-Norken Limited.
Sales and Showroom, Dept. P.W., 76 Victoria Road, Swindon, Wilts.
Open 9 a.m. to 6.30 p.m. Weds. early closing.
Personal callers welcome.
Telephone: Swindon (OSW3) 27660.
12PW66
All our products are fully guaranteed. Should you not be completely
satisfied we will refund your money in full without question.
596
E
E
CIRCUITS FOR AUDIO AND TAPE RECORDING
By F. C. Judd, A.Inst.E., Haymarket Press Limited, London.
pages. Size 10; x 8in. Price 7s. 6d.
80
MANY of the circuits contained in this book
have been published in earlier issues of the
Amateur Tape Recording magazine. However
this volume does contain a large number of very
useful circuits covering most audio requirements.
Component values are given for almost all the
circuits and in some cases a layout diagram is also
included.
Over forty circuits are shown including stereo
amplifiers; microphone mixer units; hi-fi amplifiers;
echo units; even circuitry for an electronic metronome and a simple transistorised electronic organ.
After looking through the pages several times your
reviewer was lead to the inescapable conclusion that
7s. 6d. for this is excellent value for money.-DLG.
=
AMATEUR RADIO ANTENNA HANDBOOK
By Harry D. Houton, W6TYH. Published by Foulsham-Sams & Co. Ltd.,
Slough, Bucks. 160 pages. Size81in. x5=,in. Price24s.
THIS book appears to offer both theoretical and
practical aspects of aerials suitable for the
radio amateur. To do this in 160 pages is a
very tall order and to me this attempt has been a
failure.
The eight chapters include Transmission Lines;
Antenna Fundamentals; Practical H.F. Antennas;
Impedance Matching Systems; Antenna Coupling
Systems; and Practical Antenna Construction.
Some of the pages seem to be a waste of time to
read. On page 151, for instance, there is a table
of data for guying towers and information on the
wind load. The smallest tower mentioned here is
120 ft. high, and one wonders how many amateurs
in this country could either erect or afford this sort
of thing.
Perhaps the biggest gripe about this book is the
price, when one considers the ARRL Antenna Handbook with some 300 pages for 19s. 6d. post free.-
DLG.
=
=
=
FUNDAMENTALS OF RELIABLE CIRCUIT DESIGN
Vols. 1 and 2. By Mel Xlander. Published by Iliffe Books Ltd., London.
Vol.1. 197 pages. Size 8tin.x 54in. Price30s. Vol.2. 138pag es. Size 85in. x
5;in. Price 27s. 6d.
THE preface begins "The purpose of this book
which is published in two volumes, is to introduce the principles of basic circuit design and
to provide practice in solving the type of problems
that occur in industry."
How refreshing to find an accurate preface which
sums up two volumes in a single sentence. For those
who are interested in circuit design, these books
should prove ideal; a very thorough treatment of the
exact why and how of circuit design.
The style of the author is excellent and even the
more obscure points are explained with the greatest
clarity. Volume 1 covers Fundamentals of Linear
Circuits; Inductance; Capacitance; General Equations; Voltage Extremes; Current Extremes; Voltage
Divider Design; Threshold Circuits; and Power
Dissipation.
Volume 2 continues with Diodes; Transistors,
Analysis of Transistor Circuit Functions; Transistor
Specifications; Transistor Circuit Design; and Circuit Specifications.
For students or indeed anyone wanting a clear
explanation of these subjects then your reviewer has
absolutely no hesitation in recommending both these
volumes. Indeed these books would prove, in time,
to be an investment rather than an expense.-LSA.
.
AERIAL RIGGING MADE EASY!
The special series
of constructional articles describing
Television, has already covered
We now present:
=
a
TV test equipment, now running in Practical
precision R -C Bridge and a Modern Bar and Pattern Generator.
A NOVEL TWO-WAY INTERCOM UNIT ESPECIALLY DESIGNED FOR TV
AERIAL ERECTION AND ADJUSTMENT. IT EMPLOYS THE EXISTING
AERIAL FEEDER AS THE CONNECTING LINE AND CONSISTS BASICALLY OF A TRANSISTOR AMPLIFIER, CROSS -OVER NETWORK AND
MICROPHONE/LOUDSPEAKER AT EACH TERMINAL POINT.
The magazine is a/so packed with other features
cathode ray tubes and valves.
including
a
valuable article on reactivating
DECEMBER PRACTICAL TELEVISION IS OUT ON NOVEMBER 24th
-
only 2s.
597
SIMPLE audio mixers are a great utility with such
diverse equipment as domestic tape recorders and
electric guitars. The writer was therefore surprised
when he found difficulty in obtaining one to suit his
purposes in adapting a public address system for use in
a small hall. An extensive collection of past issues of
electronics magazines similarly failed to provide the
answer so the unit to be described was developed. It
had to provide a limited gain with at least three inputs,
each individually controlled and matching either high
or low impedance sources. It was decided to employ a
transistor amplifier for each input, and mix the outputs.
This procedure has the important advantage, as compared with a passive mixing network followed by a
transistor pre -amplifier, that interaction between the
various inputs is eliminated. Therefore increasing the
volume of input 1 has no effect on the signal level of
other inputs.
Figure 1 shows the circuit finally adopted. The signal
is applied via a volume control and capacitor chosen
to match the impedance of the source to a single transistor amplifier operating in the common-emitter mode.
This system sets the desired signal level prior to mixing.
The signals are mixed in a collector load common to
all the transistors. The output develops a voltage across
this resistor independent of any other signals present.
This output signal feeds the input of the main amplifier
whose volume and tone controls have their usual effect.
Power for the mixer can be obtained (as in the prototype) from a battery, which due to the very small
current drain has an extremely long life; of at least
several months. It is also possible to use the heater line
of the main amplifier, rectified by an OA 202 diode and
smoothed by a 1,000µF, 12V capacitor, as the power
supply to the mixer. It will be noticed that the base
bias supply for each transistor is obtained by a potential
divider from the collector, rather than as is usual,
from the h.t. line. This introduces a measure of feedback to correct the matching of the amplified signals
from each transistor to the impedance represented by
the common load and the other transistors. Otherwise
considerable attenuation would occur.
The actual construction of the device is evident from
the illustrations. As can be seen the prototype is
a three -input mixer, battery -powered through a
switch on one of the volume controls and built into
a small plywood cabinet. As mentioned above there
are alternatives to this arrangement and due to the
small size of the unit the ambitious constructor may
even build it into his main amplifier. The heart of the
unit is the printed circuit board shown in Fig. 2. It will
be noted that it is of unitary construction, in That each
mixer is a repetition of a standard layout. Therefore
should a mixer with a larger number of inputs be
desired the constructor need only use a longer piece
of circuit board and repeat the pattern. If this process
is carried beyond six stages, the common load may
have to be reduced and with it the mixer gain. The
circuit board is made up in the usual way by masking
the copper of a laminate board with cellulose paint
in accordance with Fig. 2, and etching off the unwanted
remainder with FeCl3. Adaption of the circuit to
assembly on veroboard or a blank paxolin panel with
wired connections on the reverse side is a possibility
should the reader wish to avoid chemicals.
Having assembled the circuit board, connections from
the volume controls to their respective elements on the
board may be made, and also connections to the input
sockets. To avoid hum problems, special care should be
taken with earth connections to sockets and controls;
where leads of more than a few inches are involved,, use
of screened wire is advisable, and the output lead to the
main amplifier is, of course, screened. In the proto-
-continued on page
Fig. 1: Circuit diagram of the
P.A. Preamplifier: Input 1 is
suitable for high -impedance
sources, while other inputs
are suitable low impedance
sources such as dynamic,
moving -coil and magnetic
microphones.
598
601
BROADWAY ELECTRONICS
TOOTING BROADWAY
92 MITCHAM ROAD
LONDON S.W.17
Tel: BALham 3984
(four minutes from Tooting Broadway Underground Station)
GARRARD 4 SPEED DECKS WITH CARTRIDGE
Autochangers: AT6 MK II, £8.19.6. AT60 with heavy turntable,
£10.19.6. 3000, £8.8.0. 2000, £6.19.6. 1000, £5.19.6. Autoslim
de luxe with Plug -in -head, £5.15.0. Autoslim £5.5.0. A.T.5
Mono £6.10.0. P. & P. all changers 6/-.
Last chance to purchase famous Garrard RC.210 quality changer.
Mono. £5.10.0 with stereo head/diamond Stylus 15/ -extra. P. & P. 6/-.
EDE Plinth for above changers size 161" x 14' x 31", 45/-. P. & P. 3/6.
SINGLE PLAYERS:
SP 25 with cartridge stereo or mono, £9.19.6. SRP 12, £5. P. & P. 6/-.
CARTRIDGES: Ronette, Stereo, 25/-, Acos GP67, 15/-, Garrard
EV26, 25/-. GC2 or GC8, 15/-. A.T.6 shells 5/-. P. & P. all 6d.
SPEAKER ENCLOSURES
TONY Corner Cabinet 20" x 10" x 7" takes 10" x 6" speaker covered in
Rexine and Vynair, 45/-. P. & P. 5/-.
BLAKE De LUXE, veneered with woodgrain formica and standing on
smart 6" legs, cabinet size 18" x 241" x 91" £6.5.0. P. & P. 10/-.
HAYDON 161" x 15" x 74" fabric covered suitable for 12" speaker,
45/-. P. & P. 7/6.
Corner Ext. speaker complete with volume control, covered woodgrain fabric, 45/-. P. & P. 4/6.
Ext. speaker complete with 8" speaker and volume control. Size
13" x 10" x 6" covered woodgrain formica, £3. P. & P. 4/6.
SPEAKERS.
ELAC Heavy Duty Ceramic Magnets 11,000 line. 10' round 10" x 6".
3 ohm or 15 ohm, 42/6. P. & P. 3/6. 8" round 15 or 3 ohm, 38/6.
P. & P. 3/6. E.M.I., 131" x 8" 15 or 3 ohm, 42/6. P. & P. 3/6. E.M.I.
Tweeter, 12/6. P. & P. 1/6. R.T.C. 12" 20 watt 15 ohm, Ceramic
magnet, £5.5.0. P. & P. 3/6. 8" x 4" Eliptical 30 ohm, 30/-. All other
speakers supplied-Goodmans, Bakers, W.B., Wharfedale, Eagle,
Tripletone.
BARGAINS IN TRANSISTORS.
AC127, AF I 115,3 116, 117, 118, 119, 0C169, 170, 171, 172, 5/6.
0071.
3/-.
0072,1
82, ,
R.F Packs 1 OC44, 2 0C45, 8/6.
AF Packs 1 OC81D, 2 OC81M, 6/6. 1 OC81D, 2 0081 (Mullard), 8/6.
AF Pack 1 GET118. 2 GETI19, 5/6. GETI 13, Red Spot, 2/-.
0C26, 28, 29, 9/6. ORP12 Light Cell, 8/6.
Diodes 0A81, 2/3. OA91 OA95, 1/9. P. & P. on above 6d.
TRANSISTOR ELECTROLYTICS.
1, 2, 4, 5, 8, 16. 25, 32, 50, 100 mfd 15 volt working, 1/3. P. & P. 6d.
250 mfd 25v DC, 3/-.
1,000 mfd 50v DC, 5/6.
500 mfd 12v DC, 3/-.
1,500 mfd 10v DC, 4/6.
500 mfd 50v DC, 5/-.
5;000 mfd 12v DC, 6/6. P. & P. 1/-.
RESISTORS. 4 watt 10 % from 3.3 ohm to 10 meg 5d. each. 4/- doz.
P.
.
&
P. 6d.
EARPIECES WITH CORD AND 3.5 mm. plug. 8 ohm magnetic, 3/-.
250 ohm, 4/-. 180 ohm with clip, 6/6. Xtal 4/-. P. & P. 6d.
TRANSISTOR SPEAKERS 8 ohm 2" 8/6; 3" 10/6; 31"12/6. P. &P.1/-.
PANEL LIGHTS. Neon 200-250v, 2/6. 6v Red, Blue, Green, Yellow,
White (uses Lilliput bulbs) 3/- each. P. & P. 6d.
Paper Condensers for Cross -Over Units, 2 Mfd, 2/6. P. & P. 6d.
MAKE YOUR OWN PRINTED CIRCUITS.
Complete kit, Hayato P.K.1, 22/6. P. & P. 1/- (with full instructions).
ROTARY
ISWTCHTCHS
E
2 pole
SWns
S/-.
1 pole 12 way, 2 pole 6 way, 2 pole 2 way, 3 pole 3 way, 3 pole 4 way,
YMa
4 pole, 3 way, 3/6 each. P. & P. 6d.
MICROPHONES.
Xtal Hand Mikes.
BM3 and 200C, 30/-. P. & P. 2/-. Stand for same 9/6 & 12/6. P. & P. 1/9
ACOS Mike 45, 21/, ACOS Mike 40, 18/6. Dyn. Mike DM-391, 22/6.
CM21 Xtal, 12/6. CM20 Xtal, 9/6. Magnetic Hm 63C with remote
control switch, 15/-. Telephone Pick-up 10/6. P. & P. 1/-.
XTAL LAPEL MIKE, 7/6. GUITAR MIKE, 12/6. P. & P. 6d.
PUSH BUTTON SWITCHES, 4 button. 2 banks of 6 S.P.C.O.
1 bank of 5 S.P.C.O. 1 off button, 5/6. P. & P. 6d.
BATTERY CHARGER KITS. 6 volt and 12 volt with circuit.
4 amp. GEC Rect., 15/-. Heavy Duty Transformer, 25/-. P. & P. 3/6.
3 amp. Westinghouse Rect., 10/6. Heavy Duty Transformer, 20/-.
P. & P. 3/6. 1 amp Westinghouse contact cooled rect., 7/6. Transformer
12/6. P. & P. 3/-. Large Croc. Clips, 2/6 per pair. P. & P. 6d.
Stockists for Eagle Products, Goodmans, W.B., Wharfedale, Bakers,
Tripletone, Linear, all makes of amplifiers and speakers supplied. Let
us quote for your requirements. S.A.E. please. Trade terms to bona
fide dealers.
I3
The New Picture-Book'wayof learning
BASICEL.ECTRICITY(SvoLs)
ELECTRONICS (6voLs)
You'll find it easy to learn with this outstandingly successful new pictorial method-the
essential facts are explained in the simplest
language, one at a time; and each is illustrated
by an accurate cartoon -type drawing.
The series will be of
exceptional value in
training mechanics and
technicians in electricity,
Radio and Electronics.
WHAT THIS MONTH'S
ENTHUSIASTIC READERS SAY
" .. By just looking at the first volume I can see that not only am I
going to learn about Electronics but enjoy doing it as well
.
L. L., Staines.
.. I am highly delighted with their contents and feel sure I will
eventually collect all volumes in print
C. R. S., Braintree.
. I must say Basic Electricity are brilliant. I will shortly be
sending for Basic Electronics
M. A., Luton.
..
..."
...
P'OS NOW FOR THIS OFFER
600
«
60
HAYES
The books are based on the latest research into
simplified learning techniques. This has proved
that the Pictorial Approach to learning is the
quickest and soundest way of gaining mastery
over these subjects.
TO SELRAY BOOK CO.
HILL, HAYES, BROMLEY, KENT
Please send me Without Obligation to Purchase, Basic Electricity/Basic
Electronics on 7 Days Free Trial. I will either return set, carriage paid,
in good condition within 8 days or send down payment of 15/- (Basic
Electricity) followed by 6 fortnightly payments of 10/-. Down payment of
15/- (Basic Electronics) followed by 6 fortnightly payments of 12/6.
Alternatively, I will send 68/- (Basic Electricity
parts), 81/- (Basic
Electronics
parts) post free. This offer applies to United Kingdom only.
Tick against set required (only one set allowed on free trial).
BASIC ELECTRICITY D
BASIC ELECTRONICS
-6
Signature
NAME
BLOCK LETTERS BELOW
FULL POSTAL
ADDRESS
-5
(If under 21, signature of parent or guardian)
battery -9V
Si
Note:- this
is
not negative 9V
liney
C711
R5
Output
C6
tVR1
VR2
VR3
O
Input
Input
type, input 1 was designed for use with high -impedance
sources, such as record decks or crystal microphones.
The other inputs are low impedance, for use with
dynamic, moving-coil or magnetic mikes.
Frequency response and distortion figures for the
battery +ve
input
Fig. 2: Layout of the printed circuit board.
prototype have not been measured, but it is in regular
use and proving satisfactory, giving accurate speech
reproduction and crisp performance on records.
la
PRACTICAL
NEXT MONTH'S
FEATURES
WIRELESS
Power Supplies
This article examines mains power supplies' in detail
and draws attention to several fundamental requirements not always appreciated when designing a
power supply to fulfil a particular role. The author
discusses valve, metal rectifier and transistor
circuitry.
"Ten -Five" Transmitter
attractive "pocket-size' 'phone transmitter
covering 160 and 80m bands for use under fixed
station, portable or mobile conditions. By the
designer of the popular Ten -Five transistor communications receiver.
An
"Explorer" VHF Receiver
A four -transistor portable receiver/tuner for a.m. and
f.m. reception on the v.h.f. bands. It covers 65120Mc/s and 110-170Mc/s, which take in the 2m
and 4m amateur bands, BBC Band II and many
other transmissions.
JANUARY ISSUE ON SALE
DECEMBER 8th
Tape Recorder Monitoring
A unit to provide simultaneous record/monitor
facilities, without the use of monitor headphones,
where these are not incorporated in the tape
recorder.
ORDER YOUR COPY NOW!
601
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PRACTICAL!
VISUAL!
EXCITING!
a new 4 -way method of mastering
ELECTRONICS
by doing
and
seeing
1
OWN and
HANDLE a
complete range of presentday ELECTRONIC PARTS
and COMPONENTS
41
BUILD
and USE
a modern and professional CATHODE RAY
OSCILLOSCOPE
2
CARRY OUT OVER 40 EXPERIMENTS ON BASIC ELECTRONIC
CIRCUITS AND SEE HOW THEY WORK
INCLUDING .. .
...
VALVE EXPERIMENTS
TRANSISTOR EXPERIMENTS
AMPLIFIERS
OSCILLATORS
SIGNAL TRACER
PHOTO ELECTRIC CIRCUIT
COMPUTER CIRCUIT
BASIC RADIO RECEIVER
ELECTRONIC SWITCH
SIMPLE TRANSMITTER
A.C. EXPERIMENTS
D.C. EXPERIMENTS
SIMPLE COUNTER
TIME DELAY CIRCUIT
SERVICING PROCEDURES
This new style course will enable anyone to really understand electronics by a modern, practical and visual methodno maths, and a minimum of theory-no previous knowledge required. It will also enable anyone to understand how
to test, service and maintain all types of Electronic equipment, Radio and TV receivers, etc.
Wo,
POST
[FREE
I
L
To: BRITISH NATIONAL RADIO-SCHOOL, READING, BERKS. Please
send your free Brochure, without obligation, to: we do not employ representatives
NOW
NAME
BROCHURE
or write if you prefer not to cut page
ADDRESS
_
BLOCK CAPS
PLEASE PW12
603
BARGAIN COLUMN
Mains heavy duty
type rotary with control knob. 5/6 each.
25 AMP. ON/OFF SWITCH.
MAINS TRANSFORMER. Upright mounting with
primary tapped 200, 220, 240 v. H.T. secondary
is 250-0-250 v. at 100 mA. and it has
secondaries of 6.3 v. 1} amp.-unused
two L.T.
(removed
from equipment), 15/- plus 3/6 post and Insurance.
INFRA -RED
HEATERS
CONSTRUCTORS COLUMN
/Gm Computer
This com-
Make up one
of these latest type heater..
Ideal for bathroom, etc. They are simple
to make from our easy -to-follow instrnetions-use silica enclosed elements designed for the correct infra -red wave=
length (3 microns). Prier for 750 watts element, all parts, metal easing as
illustrated, 21/6, plus 3/6 post and ins. Pull switch 3/- extra.
puter will
play games
and do sim.
pie tricks
and will provide endless
amusement
speech coil. Will
handle up to 10
;:
watts. Brand new
(easefi
by famous maker.
Price 29/6, with
built-in tweeter 35/-, plus 3/6 post and insurance.
Made by Lucas, Flat or
Pencil beam 36 watt. Suitable for car, boat, caravan,
etc. Complete with 6v. or 12
education
These are 4 x 15 amp. sockets
mounted
on
a metal
box already
for
wiring
to
your
power
Plug
intended for mounting on bech or wall
for uses in workshops
laboratories.
exhibitions
displays, etc. They avoid the use of dangerous bakelite multiplugs and adaptors and other
hook-ups. Price only 19/6 plus 5/. post. and insurance.
loudspeaker. High
flux permanent
magnet type with
either 3 or 15 ohm
SPOT OR FOG LAMP
as well as
MULTI -MAINS BOX
HI-FI SPEAKER BARGAIN
121e. High fidelity
-
.
- -
-
SQUARE D ADJUSTABLE TIMER
This is a line American -made unit designed for precision. The time period is
adjusted by a knurled screw. The delay period can be set anywhere
from hours
or seconds. The end of the delay operates a microswitch-and resetting can be
remote controlled or manually reset. The unit is for wall mounting
and is approx.
4in. x Tin. x 4m. Price 39/8 plus 3/6.
v. bulb, flex cables and
axing bolt. Remarkable
bargain 12/6, plus 3/6 post
and insurance.
FINE RECORD PLAYERS
ARE 'GARRARDS'
and because they have been
making record players for so
long GAR.RARD are your best
choice
big range always in
stock.
7/6 for post and insurance.
LUMINOUS CORD SWITCH
This can hang on the end of a Sex or it can be
inserted into a flex. It has a built in neon which
makes it luminous in the dark. Made for electric
blankets but ideal in dark rooms, etc., normally
10/6, our price 6/6 each or £3 doz.
FINE
-
1000
2000
3000
..
TUNERS
30 pf with long spindle
as illustrated, 1/6, or
12/- doz. Twin 50 pf not
quite such long spindle,
2/8, or 24/- doz.
12V INVERTER
Fully transistorised for operating a 20 watt
flnourement tube or other 20 watt mains device.
Size Eft. long by 18 x 14 in. £8.10.0. Post & Ins. 3/-.
THOUSANDS OF TRANSISTORS
at cut prices
(e.g. Silicon N.P.V. 5/-). Send 1/6 for latest
hat and equivalent chart, and circuits. S.C.R's.
(Thyristors) 200v. 1 amp. 6/6; 3 amp. 7/6;
12 amp. 15/-; 400v. 1 amp. 15/-; S amp. 17/6.
5 amp. 22/6; 25 amp. £3; 50v. 1 amp. 8/6;
3 amp. 7/6; 10 amp. 10/-; 25 amp. 30/-.
DON'T MISS THIS it will save you 2100. 0v.
Nickel Cadmium Battery type
PP3 (fits all popular pocket transistors'. Can be recharged 800 times.
Price with transformer type battery
charger, only 52/6 p. & 1. 3/-.
Chargeable replacements Mao In
stock for 117 12/6; Uí1 33/; 1212
32/-.
NO SOLDERING
POCKET 3
MISCELLANEOUS BARGAINS
amp. ear battery charger rectifier 10/6 (post. 3/6).
Reed switch with magnet 6/6;4 meo. pots. 6/- doz.,
ditto with d.p. ew. 10/- doz.; Siltson Rect. BY100,
350V, 250mA, 4/6 each. 3 for 12/-. Miniatine
pick-up with Cosmoeord Crystal cartridge and
sapphire stylus 3/6; 4 transistor audio amplifier
19/6; turret tuner, less bottom cover and valves
7/6 each, Neons (Midget) 1/6 each; valve type
10/6 doz., slide switch miniature 1/6; mains type
21-, toggle switch 2/3.30 amp relay for controlling
heating 39/6, 80 watt fluorescent kit 17/8 (poet
3/6). 4 pole change-over switch for series parallel
working 4/6.
S.C.R. Light Dimmer. Can also be used to control
the speed of Motors, drills and the heat from or to
critical instrument circuit recently described in
Practical Electronics. Mains operation this fits
into 13 amps. socket outlet box. All the components including the silicon controlled rectifier.
Available ea a hit. Price £4.10.0, Plus 2/9 post. &
5
ins
Where postage is not definitely stated as an
extra then orders over £3 are post free
Below £3 add 2/9.
604
,. £11.11.0
..
..
£10. 9.0
225. 0.0
THIS MONTH'S SNIP
ELECTRIC BLANKET OUTFIT
thirteen yard, 70 watt waterproof element with temperature control by
Thermal balance-and a double pole blanket switch in pastel blue bakelitewith enclosed neon ON/OFF indication-both items ideal for renovating a
defunct or doubtful blanket-supplied complete with layout and other
instructions only 12/6 plus 1/0 post and ins.
simply from plywood. Price £4.17.8, plus 2/6
post. and ins.
Simple reeeiver for low voltage a TRF transistor
set powered from the Sun or a 11v. cell. Suitable
for children or others who forget to switch off.
4 N.P.N. silicon transistors, diode and all other
components necessary to build this circuit
described in Wireless World Oct. are available
as a kit price 80/- plus 2/6 post. & ins.
Electronic Controller for model locomotives. A
devlee to overcome jerky stopping and starting is
described in Wireless World Oct. All components
including five transistors, 4 diodes, mains transformer, etc. to build this circuit is available as
a kit price £4 post. & ins. 2/6.
Noughts & Crosses Machine. This machine des-
cribed in Sept. (65) Practical Electronics is
impossible to beat and will provide endless inn
at home and considerable attraction (and profit)
at charity do's and fetes, etc. It employs 19
switches and 9 bulbs and these and the other
components necessary to make this are available.
Prier £4.10.0 post. and ins.
MULTI PURPOSE NEON TEST UNIT
-
-
-
-
Robust, useful and instructive-teat insulation
capacity
continuity
resistor
volume
contrats-also acts no signal injector and L.T.
fault finder-kit comprises neon imlicator,
4 way wafer switch, ebonite tubes, resistors,
condensers, terminals, etc., with diag. only
9/6 plus 2/- post and Inman.
STUPENDOUS OPFER -211 for £2
FLUORESCENT SNIP
Your opportunity to instal non -flicker strip lighting at silly price-this month
we offer the famous A.E.I. (Mazda) instant start fighting transformer suitable
for one, 4ft. 40 watt tube or two, 2ft. 20 watt tubes. This transformer is listed
at over 27, but this month you can buy the complete kit comprising instant
start choke/transformer, two tube ende and two Terry cups to hold tube. Special
snip price only 14/8 plus 3/9 post. and insurance-don't miss this tremendous
bargain.
See in the Dark
INFRA -RED BINOCULARS
These infra red from a high voltage
source will enable objects to be seen
in the dark, providing the objects are
intherays of an infra -red beam. Each
eye tube contains a complete optical
lens system as well as the infra -red
cell. These optical systems can be
used as lenses for T.V. cameraslight cells, etc.(detallssupplied). The
binoculars form part of the Army
night driving (Tabby) equipment.
They are unused and believed to be In good working order, but sold without a
guarantee. Price £2,17,6 pins 10/- carriage and insurance. Handbook 2/6.
-
-
.
A
Lots of fun to build
and good results when
finished
complete
kit with detailed instructions and crystal earpiece
batteries, 1/2d. extra
£5
value only 19/6, plus 3/ post. & ins.
25. 5.0
AT60
.,
£6. 9.6
SP25
£7.19.6
LAB80
SRP12
.
£3.9.6
Complete with service sheet and template.
,
into computerisation. Kit comprises all the components,
the printed front panel and full instructions. The
box is not included but this can be made very
FIELD TELEPHONE UNIT
Officially known as remote control omit
No. 1, essentially these are telephones with
additional facilities --each unit contains
magneto type ringer and bell-as well as
transformer-relay and switches. A pair of
these will give you two way communication
over distances up to live miles-unused and
in good condition, 39/8 each plus 7/6
carriage and insurance.
MAINS/TRANSISTOR POWER PACK
MAINS POWER PACK designed to operate transistor sets and amplifiers. Adjustable output 6 v.-9 to 12 v. for up to 500 mA (class B working). Takes the place o!
any of the following batteries: PRI, PP3, PP4, PP6, PP7, PP9 and others. Kit
comprises mains transformer-rectifier, smoothing and load resistor. 5,000 and 500
mill. condenser. Zener diode and instructions. Real Snip at only 14/6 plus 3/- post.
Only recently sold for £10.8.6. Note these features:
Long & Medium Wave
Long dial a Push
pull output
A.V.C. and feed back e Ferrite
aerial a Six transistors 14 Cabinet size 40in. x 3in.
ae lain. with carrying strap. You get everything
you need and instructions. 39/6 plus 3/6 p. & p.
or supplied with made up chassis 10/- extra.
Battery 119 extra. Data separately 2/6.
ENGINE REV. COUNTER
or direct reading frequency meter
Employing a special frequency discriminator the
instrument is just right for many of the jobs you
have wanted to do-it can be permanently
installed as a rev counter or as a portable lustre.
ment it will do such jobs as measuring frequency
of time base-pulse generator-flip-flop, etc., etc.
Kit comprises: metal front panel all prepared and
stove enamelled, moving culls meter, 4 specially
tested transistor and diodes and all the necessary
resistors and condensers and circuit diagram
(separately 2/8) all for 49/6 plus 2/6 post. and 'Ms.
OZONE OUTFIT-for removing smells and
"generally improving any oppressive atmosphere.
Kit consists of Philips Ozone Lamp and mains
unit, only need box, 19/8 plus 6/6 care. and ins.
Solid State Ignition. Big things are claimed of
Electronic ignition systems and if you would like
to try for yourself a.circuit as described in Practical
.Electronics (Slept. 1966). This requires a silicon
controlled rectifier, four transistors and other
components aridable as a kit, price £5.10.0
post free.
Rain Sensor. Here's a simple unit that will help
your wife. Rings a bell or flashes when It rains.
All the components and data 39/6 post. 2/6.
Be
SELF REPAIRING FUSES
Sounds good doesn't it-we can't offer quite that but we can offer a fast acting
overload trip which will save you having to repair fuses every time you do
something which would normally blow a fuse. The trip works first and as you
would instal this on or near your bench all you do is to switch on again. This is
made by Westinghouse. Regular price about £10 each. We offer them this
month at 29/6, plus 5/- poet and insurance. Not many in stock so hurry or you
will be too late.
first this year
SEED AND
PLANT
RAISING
Soil heating wire and
transformer.
Suitable
for standard size garden
frame 19/6 plus
3/6
post. & ins.
ELECTRONICS (CROYDON) LIMITED
102/3TAMWORTH ROAD, CROYDON, SUR REY (Opp. West CroydonStation)
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HI-FI
RADIO
.
'.
ALL ITEMS SENT POST
INTEGRATED
EAGLE SA100. 10W
-
TEST EQUIPMENT
COMPONENTS
..
F REE
STEREO AMPLIFIER
compact, versatile integrated
unit for monaural or stereophonic
reproduction from record player,
tape recorder and tuner. Power
output 5 watts per channel. Frequency response 40-20,000 c.p.s.
A
WI -2. TRANSISTORISED
WIRELESS INTERCOM
No wires, no installation needed,
simply plug them into AC power
point and talk. Unite have press.
to -talk lock switch and on -off volume
control. Ideal Intercom or Baby Alarm
for home, office,
factory.
£14.12.0°m'
plete.
DP303. DOOR PHONE INTERCOM
titeo sensitive transistorized intercom
designed so that you may answer
the door from within for greater
convenience and safety.
Intercoms
£4.12.6Other
available.
Tp-Tb
--TD
£18.0.0
EAGLE AFM100. AM -FM TUNER
Combines a host of advanced featureathat easily make it the finest AM-FM timer 'nits
clase. A tuned RF stage on FM, AFC circuit and a heavy flywheel giving smooth but
effortless tuning, built in AM
A25 035-1605 K/s.
Ferrite aerial: FM.88-108Mc.
£29.0.0
The perfect answer for the music lover who wants full range
fidelity in a compact system. Features an 8m. full range
high compliance speaker with an output capacity of 20 watts
RMS. Frequency response: 30-20,000 c.p.e. Resonant
frequency: 30-40 e.p.s. Sensitivity: 97 dblw. Flux
density: Over 12,000. Impedance: 16 ohm. Size 140in.
high x 105/rain. widen Sin. deep.
6 transistor 8 diode F.M.
Tuner. Covers 88-108 Mc. Operates
from 9 -volt battery, micro miniature
brilliant FM reception.
giving
circuit
Ready to use, simply connect to your El
Fi amplifier. Instructions supplied.
£8.10.0
£20.15.0
LA9P. AC ELIMINATOR
with a double wound step down.transformer to operate 9v Radios,
£1
etc., from AC Mains.
.8.6
As well as this beautifully designed speaker there are two
other models 11865. 10 watts RMS at £12.12.0 and 25840
5 watts EMS £8.10.0.
All three speakers are finished in magnificent rosewood and
the entire cabinet filled with acoustic damping material.
Subminiature
SIGNAL GENERATOR
stable wide range signal generator
with a range of 120 Ke/a-260Mo/e on 8
bands. Features a large 4}in. vernier
tuned, etched circular dial for easy
accurate frequency adjustments Complete with
instructions.
A
MS80. 20W ROSEWOOD SPEAKER
SYSTEM
£14.14.0
EAGLE FMT41. FM TUNER
TE -188. RF
EAGLE PRODUCTS
MAGNETIC STEREO CARTRIDGES
M10070 GOLD
Response: 20-20,000 cps
Output: 51tEV at 1Kc/
Scm/Sec.
Stylus: 0.6 Mil diamond
311007F. SILVER
Response: 20-18,000 ape
-
Tracking Pressure
1-2.5 grams.
FSW1. FOOT SWITCH
Snap action foot switch with skid proof
Output: 1031V at 111c/
Scm/Sec.
Stylus: 0.7 Mil diamond
Tracking Pressure
2-4 grams.
rubber base pad. Plugs into your Tape
Recorder remote control system but
special adaptor supplied enables this to
be used with all other 24/_
£5.14.6
£6.12.6
Tape Recorders.
CSK.10
Both feature singularly smooth reproduction and incisive separation of etereo channels
Self -powered
ALL TRANSISTOR PUBLIC ADDRESS AMPLIFIERS
Eá304
Sob-miniature 3 watt transistorised
push-pull radio amplifier on printed
circuit. Ideal unit for Intercoms, Baby
Alarms, Radio Tuners, etc. Complete
with circuit and minflictions.
Also available EG104.
One Watt
C
and Eá2004 250 mW
£3.12.6
£3.2.6
£2. 5.0
SS.70.S. STEREO SELECTOR
SWITCH
Seven position
stereo switch for
selecting all or
eeven different combinations for HI-FI.
Speaker
systems.
Will handle up to
60 watts of Audio power.
O.O
Complete with inatretns.
Two new modela offering the last word in P.A.
amplification. All transistorised circuit, negative
feedback circuit reduces distortion to a minimum.
Two mike inputs high and low with individual
controls. Plus Inputs for TAPE, TUNER and
RECORD PLAYER.
PA540 35 Watts
1,1.541 50
instrument.
£21.19.6
K142. VACUUM TUBE
VOLTMETER
This high quality V.T.V.M. is an indispensable test instrument for the technician -engineer. It is a highly accurate
D.C. Voltmeter, A.C. Voltmeter and
Ohmmeter incorporating a 6in. full
view meter.
£21.15.0
Also a full range of other meters
available.
LATEST EAGLE PRODUCT TSA90
4x4 WATT ALL TRANSISTOR
AMPLIFIER
Gram and radio inputs -output impedance 3-16 ohms. Silver anodized
aluminium front panel complete with
matching metal óonbss..
STEREO
Watts
Other P.A. modela available.
£36.0.0
£56.0.0
SC10F. RECTANGULAR
REFLEX HORN SPEAKER
An outstanding combination of reflex horn and driver
unit for car mounting, to deliver wide angle high
quality reproduction. Weatherproof, waterproof and
shockproof. Output 10 watts.
£7.15.0
Also available SC5F: 5 watts, £4.2.6 and SC15F:
15 watts £14.12.6.
SR165. ALL BAND
£1.1
TEI9O. SINE SQUARE WAVE
AUDIO GENERATOR
SINE WAVE: 20-200,000 cps in four
bands.
SQUARE WAVE: 60-30,000 cps. Input
impedance 0-5,000 ohms. Especially
designed for HI-FI Radio and TV
Service men who require a dependable
crystal set kit
with private
earphone. Supplied complete
with
instructions.
COMMUNICATION RECEIVER
This entirely new professionaltype communication
receiver features frequency coverage of 535 Eels 30 Mcjs for complete general coverage. In particular ham bands are arranged in the same calibration scale, so that the band switching can be
accomplished rapidly.
VD40H CARDOID
DYNAMIC MICROPHONE
DM81C.
CARDOID
Features a pop - DYNAMIC
diaphragm
and superior anti
feed-back properties, reduces feedback and room reverberation. O/p:
-42 db. Response:
60proof
MICROPHONE
Superb quality with
ball head for distributed cardoid frontal pick-up. Output:
-52db. Response:
40-13,000 cps.
Impedance50kohm.
12,000 cps;
50K ohm im- £7.7.0.
pedance £6.8.
27 other microphones available.
R E L.DA RADIO LTD
£2.2.0
charts.
£48.0.0
DM24HL
goose-
neck
dual
impedance
microphone
600 ohm 50K ohm.
Response:
50-11,000
cps.
£6.6.0.
FOR FULL DETAILS OF THESE AND MANY OTHER ITEMS SEND FOR FREE
COMFRF.RWNSIVE CATALOGUE, EAGLE fsEWS AND ORDER FORM. ALL ITEMS
AVAILABLE POST FREE AND COVERED BY 12 MONTHS' ;GUARANTEE.
Callers Welcome at our
87 TOTTENHAM COURT ROAD, LONDON, W.1.
HI-FI SHOWROOM
10 ens.
MCK.2. MORSE CODE KIT
Two station morse code kit supplied
with instructions, 50ft, of connection
wire and morse code
-
EEK28. 28
PROJECT CONSTRUCTIONAL KIT
This advanced educational kit is excellent for beginners as well ae the more
advanced experimenter. Not even a
soldering iron is needed. Complete with
60 page booklet giving fall detail.
of suggested circuits.
£6.1 0.0
WIRELESS MICROPHONES
WM909 (as illustrated)
Pocket FM Wireteea
transmitter
complete
with tie -pin microphone.
Transmits clearly up to
100 yds. and
is
fully
tunable over the entire
FM band. Simply used
with an FM radio or
tmer.
£14.0.0
Also available W11508
£21.0.0
Professional stick type
877
Tottenham Court Road, London, W.1,
FM Wireless Microphone.
These cannot be operated in U.K.
607
KTBC
Fully guaranteed
Individually packed
DL810
DY86
AC6PEN 5/- ESOP
AL60
5/- EBSCC
ARP3 3/- E9000
ARP12 2/6 E1148
ARP24 3/6 E1266
5/- E1415
AR8
ARTP1 6/- E1524
ATP4
2/3 EA50
5/6
ATP7
AU7
55/-
AZ31
B611
15/-
91-
BD78 401BL63
10/B84
8/20/B85
B884 37/6
B2134 16/BT19 25/BT35 25/BT45 150/BT83 351003L
2/-
EF81
EF85
EF86
EF89
EF91
8/716
23/-
10/2/6
50/30/12/6
1/-
7/E173
EABC80 5/9
3/6
EA91
EAF42 8/1/8
EB34
8/EB91
EBC23 6/-
8/6
5/EBF80 6/6
EBF83 7/6
EBF89 6/9
EBL31 2014/E052
E053 12/6
4/CF23
1016 E070
2/CV71
S)- EC90
31CV77
5/- E091
0V102 1/- ECC81 4/4/- ECC82 5/017103
C1,4004 7/- ECC83 6/CV4014 8/- E0084 5/6
CV4015 71- ECC85 6/8
01,4025 10/- ECCBS 9/01'4049 6/- ECC91 4)CY31
6/6 ECC189 9/6
16,1
1/6 ECM 7/D41
6/- ECF82 71D61
61-
077
3/3
DA30 12/6
DAF96 6/DD41
4/-
8/2/DET25 15/EF73
5/DF91
3/DF92
3/DF96
6/D1163
5/DK92 8/1/1(96
6/8
4/DL92
4/D193
DL94
5/9
DET5
DET20
DL96
EZ41
EZ80
EZ81
F/6057
F/6061
F/6063
E01142 91E01181 5/ECH83 7/6
ECL80 61E01.82 6/3
ECL83 101ECL86 9/-
EF36
EF37A
EF40
EF50
3/4
7/8/2/6
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61-
2
EF53
EF55
EF71
EF72
EF73
0E74
71- EF80
5/9
41-
16/25/-
KY76
8/6
KT88 22/KTW61 4/6
KTW63 51KTZ41 6/KTZ63 5/118100
9/-
5/6
4/6
51-
5/-
4/FW4/5006/6
EW4/8008/6
GI/236029fG1/370K
20/G50/2G 5/G180/2D115/451GM4
GZ32
10110/GZ34
4/6
8/-
111154
22/6
HL2K 2/6
6/HL23
HL23DD 5/-
7/8
5/5/4/5/-
11L41
11VR2
K3A
41-
9/60/-
12/7/-
118141
118161
M114
PCL85
PCL86
8/6
8/PEN25 4/8
PEN46 3/PEN200A3/PFL20017/8
PL36
9/PL38 16/PL81
PL82
PL83
7/6/6
6/PL84
6/6
PL500 13/6
P1124A 5/PT15 13/PT25H 7/6
PT25M 7/6
PX4
14/PX25 12/6
PY33
8/6
PY80
5/6
PY81
5/6
PANEL METERS
0-3 amp RF
100mA AC
15v AC
150v
AC
4/6
4/6
11/6
0801 17/17ABC80 6/UAF42 9/UBC41 6/UBF80 5/6
QS95/10 5/6 UBF89 6/6
UBL21 10/Q9150/15
10/- 170085. 6/6
6201202 8/- 001142 8/QV04/7 8/2 1701181 6/-
PY82
5/6
PY83
6/PY800 8/PZ1.35 9/PZ1.75 12/QP21
6/QP25
5/QP230 5/-
8/R10
9/5/ - RG4/1250
EPOS
MELDS 10/- R1172 80/EF95
6/EF183
11L6
6/25/15/- 9131
EF184
11-78
9L30 12/6
7/6
NE17
E1190
71602
8/6
BHT], 300/- 0A2
5/9 SP41
1/6
3/9 OBI
6/- SP61
EL32
1/6
EL34 10/- OB3
715/EL36
51 (303
ELIO 17/6 0D3
5/EL41
8l- OZ4A 5/EL42
8/ - P11-35 14/- 0016 20/8/- PC86
ELIO
9/- 0021 23/8/- PC88
EL81
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912/6
4/3 PC97
EL84
9/6 0035
716
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PC900 12/- 0044
6/54/6 PCC84 5/6 0045
EL91
5/- PCC89 10/- 0071
EL95
4/6
EL360 20/- PCC189 9/6 0072
5/6/- PCF80 6/8 0073
EM80
95/7/E71181
PCF82 6/6 0081
6/3 P0F84 61EM84
EN31 10/- PCF86 8/- SP210 616
ESU74 80/- PCF802 9/6 8TV280/40
E9U208 6/- PCF805 11124/5/6 PCL81
EY51
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EY86
10/3/EY91
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EZ40
12/6
6/6 PCL84 7/- T41
121-
EBC41
EBC81
6/4/6
6/6
5/3/6
2/5/6/6
6/6
.
8/-
14106
111'67
VALVES
AC/HL 4/6
6/ACP4
221-
KT32
KT44
KT33
20/25/-
..
2in. square ..
..
3;in. round ..
24ín. roupd
2;in. sq. (black dial)
1750
U52
U191
UCL82
UCL83
R3
TT11
TT15
TTR31
TZ0520
TZ20
1781
1112/4
1.117
U18
1125
1726
027
17E41
17E89
8/6
UL41
UL84
7/6
5/6
7/8/6
7/8
6/6
17175
17128
UY21
UY41
6/-
121921B
1N43
12770
1R4
1R5
184
185
4/- 5Y3GT 5/4/- 5Y3WGTB
914/6/6
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3/6 5Z4GT 8/4/5/- 6A136
3/4/6 6AC7
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TDOX-20
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TP25
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8/- 5B251M40/1A5GT 5/- 5B252M35/1B22
30/- 5B/253M
15/1C5GT 6/1D8GT 6/- 51325421 40/1E7G
7/6 513255213511F2
3/- 5R4GY 9/7/1G6GT. 6/- 5T4
4/6
1L4
2/6 5174G
1LA6
6/- 5V40
8/8/6
1LC6
7/- 5X40
4/6
1L114
4/- 5Y3G
Y65
70/5/-
5/-00201 12/6 XC141
5/-00202 15/-X0142
X0155
10/15/008121
20/00203
1216
0081 10/22/6
0C82DM$/- 00204 17/6 X0756
227247
OC83
5/-00206 22/6 227412 916
7/6
0083B 51-AAZ12 6/- 227502 47/0012 5/-AC128 7/6 227585 10/6
00170
6/-BCZ11 7/6 2271090 20/6
7/6 2271091 29/00200 10/6 BY38
00,811)
UY85
V1120
51-
4/-
V1507
51V1924 20/VP23
3/VP133 91-
VR99
8)-
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V1739
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15/-
45/-
VX8122 5/-
181-
vX8124 5/W21
5/W118 10/-
8/-
81-
41-
16/-
Wus
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8/- X81M
11/- X118
11/-
X145
8/- Y63
1T4
2X3
2026
2026A
2034
2045
2046
2051
3/-6AG5
5)71-
3/71-
22/6
30/-
6AG7
6AH6
6AJ7
6AK5
6AK7
6AK8
12/- 6AL5
5/- 6AL5W
3A4
4/- 6A315
3A/108A20/- 6A116
21311
3A1463 55/3A/167/M
3B7
3B24
306
3E29
25/5í9)4/50/-
716
18/-
8/8/5/-
3Q5GT
384
áV4
3X2
2/6
6/-
10/2/-
5/6/-
5/9
31-
7/2/8
4/6AQ5
7/6AQ5W 9/4/64.86
6A86W 9/6A97G 15/ OATS
4/-
6AU6
6AX4
61-
8/17/-
7/-
6134G
6B7
61-
5/9
6138G
216
51-
5/3/-
6BA6
lITANY OTHERS IN STOOK includeüathode
Ray Tubes and Special Valves. U.K. Orders below
61 P. & P. 1/-; over 01, 2/-; over £3, P. & P. free
C.O.D. 3/6 extra. Overseas Postage extra at cost.
WELL PROVEN RELIABLE COMMUNICATION
RECEIVER P.C.R.3
201-
25/-
of
MARCONI
19
&
P. 3/-.
SIGNAL GENERATOR TYPE TF
801B/3/S. Frequency range 12-485 Mc/s. in five
Output
ranges. Directly calibrated frequency dial.
waveform: C.W. sinewave A.M., pulse A.M. (from
ext. source only). Internal modulation frequency
1,000 c/s. Output: a, normal-continuously variable
directly calibrated from 0.1µ v.-0.5 v. b, high: up to
v. modulated or 2 v. unmodulated, output impedance
Fine frequency tuning control, carrier
50 ohms.
on/off switch, built-in crystal calibration for 2 Mc/s
and 10 Mc/s. Stabilised voltage supply. In excellent
"as new" condition. Fully checked and guaranteed.
£115. Carr. 30/-. Including necessary connectors,
plugs and instruction manual.
1
60kc-420kc,-500kc-13mc.
bands, 2 HF stages, 3 IF stages. AVC on both
phone and CW. Excellent condition, correctly tuned
C.R. 100 RECEIVER.
In 6
and guaranteed, £31. Carr. 30/-.
MARCONI VALVE
VOLT METER TYPE TF
428-B. 1.5v to 150v RMS in five ranges. A.C. and
D.C. stabilised power supply. Complete with probe
unit for RF measurements. In new condition and
Laboratory tested £12.10.0. Carriage 101-.
608
6BQ7A 8/6BR7
9/6BW6
7/-
2/-
6C4
6C5G
2/6
6/-
6C5GT
606
6C6G
6C8G
60216
4/3/3/-
4/6
80/9/12/-
6021
601,6
60W4
606
3)6/-
6E5
6F5GT 5/9
6F6G
6F7
6FBG
6F12
6E13
6F14
6E32
6E33
41-
6X5
635G
6.16
6J6W
637G
6J7M
6K6GT
6117G
6KJGT
6K8G
6K8GT
6K8M
6K25
6L5G
6L6GA
31-
6LD20
5/9
35T
35W4
51-
35Z4GT 6/35Z5GT 6/-
7Q7
18/-
767
7V7
7Y4
101,9
12A6
12A117
12AT6
12AT7
12AV6
2/6
5/-
54//-
5/6
5/12AT7WA
12A177
516
12AX7 6/12AY7 10/12BÁ6 5I-
7/1213117711233E6
1208
7/2/2/-
1206
12116
GT 216
12JSGT
12K7GT 2/6
12K811
Kß11 121-
0f128A7
12807
12807
12ßH7
71-
7
4/6/
61-
12877
12ßK7
5/-
6/6
60117
6027
6837G
69K7GT
60K7
69L7GT
7151516
3/6
5/6/6
30015
30018
8/6
3005
30FL1 1016
30L15 11/30P12
9/30P19 13/30PL1 8130PL13 12/35160T 7/-
7/3
7/-
71-
5/9
69A7GT
6807
620-70T
6SFGT
5/9/6
11/-
30
7117
7/6
6N7G
6P25
6Q7G
6R7
71-
6/6
2525
7/6
25Z6GT 8/6
251/7
6/-
10/-
6277
696.7
8/-
25014G
7B7
705
706
3151-
12/5í5/6
251,5
5/-
2/-
11/4/-
25L6GT 5/-
6.4
51-
7/6
61,7G
6L34
6Z5GT 513
6Y6G
ó/6-30L2 10/-
9D2
9D6
4/20/2/6
1/6
10/6/2/3/6
6/5/8/5/8
2/4/9
3/8/3
6/6
24/6/-
6L6101
6X5G
7Z4
ßD2
51.-
634WA
6X4
616
4/-
6H6M
6X611
3/6
6/2/9/6
5/7/6
8/3/6
5/-
8/4/6
2/6
6/-
6060
68Q7GT
6887
6U4GT
6V6G
6V6GT
12BN7GT
120217
12Y4
12L7
1407
151/2
19E2
19G3
19G7
4/-
19111
19211
5/6
5/6
21136
20P4
5/9
5/-
2/71-
18/-
6/-
15/40/5/18/5/12/8
7/-
35Z1
6/61-
5/8
5/6/6
5/6
9181-
8/80/-
210VPT
7 -pin 216
220 PA 7/220TH 41-
225DÚ9/357A
368A
368A8
393A
446A
703A
705A
715B
717A
724A
801
803
807
808
5/6
25/-
8/7/5/-
30127/6
81-
30/101-
60)-
3/-
151-
6/22/6
8/8/-
813
815
85)35/-
819B
830B
832A
501-
843
1625
1626
1629
4/8
5/35/8/20/9/-
2051
40430
C.R. Tubes
E4504/13/16
57
58
59
75
76
77
78
80
81
84
3100
350B
2/5/4/5/3/5/6/3/-
958A
1612
1616
1619
5/-
4/4/-
307A
2/6
6/-
10/-
2158G
6/50CD6G27/6
50L6GT 8/7/6
53A
880
417
955
956
957
4063
4313C
5704
5726
6060
6064
6065
6080
6146
7193
7475
8013A
8020
9001
9002
9003
17/6
5/-
37
38
85A2
14/10/-
866A
884
954
4)-
451-
5/-
71-
5/7/6/22/251119
2)25/:
15/-
3/-
416
61216
9004
9006
2/6
28/-
V01197 40/-
VCR138A
40/-
VC1151750/-
VCR517B
551-
VCR5170
60/3FP7 45/3EG1 40/5P01
30/5FP7 12/8
44/88D
Photo Tubes
G016 12/6
551931A
6097 350/Special
Valves
ACTO
£8
K301
£4
KRN2A
£3.10.0
25/11324
2322 £2.10.0
£3
2.754
417A
3J/92/E
30/-
£37.10.0
714AY
£4
715A
30/19/ 716 A
TR 50 XM TRANSMITTER/RECEIVER INSTALLATION, for channel TX, provision for crystal or
master oscillator. Frequency 1.5-12Mc/s. Output 50w.
Complete with all accessories, alternatively Dynamotor power unit for 12v. D.C. operation or P.S.U.
handset,
A.R.88D. RECEIVERS. Fully reconditioned, £55.
Rebuilt model, £85. Carriage paid U.K.
MODERN POWER SUPPLY UNIT.
Supply voltage A.C.: 105, 110, 115, 200, 205, 210,
220, 225, 230, 240, 245, 250 v. Available voltages D.C.:
mA.
(a) 1700-1900 v. Stabilised, adjustable approx.
ULTRA
1
mains and Heavy Duty
sets, 17/6. P.
61337
68277
2/6. P. & P. 2/-.
L.F. TRANSFORMERS.
VARIOMETER for No.
6/6
7/6
7/-
INSET MICROPHONE for telephone
ULTRASONIC GENERATOR
LARGE SELECTION
51-
110/220v A.C. Full details and prices upon request.
together
with power supply unit for 200-250 v. A.C. Complete
two chassis with interconnecting cables. Frequency
37 to 43 kc/s adjusted by fine control. Peak output
2 kw., average output 500 w. Completely new with
valves and manual £65, carriage paid U.K.
KW
2
6BA7
6BE6
6BJ6
3 bands, 1:medium wave, 2:120-43m
3:43-13m. Overall sensitivity 1-2µV. S/Noise ratio
10 dB at 6µV. Circuit incorporates an RF stage, two
I.F. stages, tone control, A.V.C. antenna trimmer.
6V6 output. Set in new condition together with headphones and speaker plug, £9.5.6. With vibratory
supply unit, 12v, £10.4.0. With specially built-in
P.S.U. for 210-250v. A.C., £11.17.6. Carriage either
set 10/-.
(Made by Pye).
RECEIVERS
Ask for your needs from our huge selection.
SPARES FOR AR
P. C.
88 D
RADIO
LTD.
170 GOLDHAWK RD., W.12
SHEpherd's Bush 4946
Open 9 - 5.30 p.m. except
Thursday 9 - 1 p.m.
(b)
(c)
(d)
(e)
260-350 v. stabilised, adjustable, approx. 45 m.
450 v. approx. 30 mA.
50 v. approx. 150 mA.
(f) 4.5 v. A.C. amp. common earth.
(g) 6.3 v. A.C., 4.5 amp. common earth.
valves, 7 silicon rectifiers, 4 Selenium HV rectifiers. Brand new, 09.10.0. Carriage 12/-.
5
PHASE MONITOR ME-63/U. Manufactured recently
by Control Electronics Inc. Measures directly and
displays on a panel meter the phase angle between
two applied audio frequency signals within the range
from 20-20,000 cps to an accuracy of ±1.0°. Input
signals can be sinusoidal or non -sinusoidal between
2 and 30v peak. In excellent condition together with
handbook and necessary connector £45. Carriage 30/-.
H.R.O. SENIOR TABLE MODEL TYPE M (50
KCS-30 MCS) with "S" meter and crystal filter in
excellent, fully checked and tested condition together
with set of 8 general coverage coals and original mains
P.S.U. for 110/2100., £26.10.0. Carriage and packing
30/-.
RACK MODEL also available at the same price.
"S" METER for H.R.O. Receivers. Brand new,
£2.10.0. Carriage paid U.K.
EDISWAN SEALED RELAYS TYPE H
96 C.
ohms. 12/6. P. & P. 2/-.
TELEPHONE HANDSET. Stan/lard G.P.O. type,
new 12/-. P. & P.2/-.
145
PERSONAL CALLERS WELCOME
HT2 approx. 45mA.
ohms plus
145
MODIFYING THE
ELECTRONIC GATE
Described
in the
April Issue
ONE of our readers who has built two of the
electronic gates, described in the April issue by
H. T. Kitchen, for converting single -beam
oscilloscopes into dual-trace machines, has modified
the original circuit to make it more versatile.
Briefly, he has made the gating oscillator free
running continually variable from 50c/s to 5kc/s
-and improved the wave shape of the high
frequency gating pulses.
Variable Gating Speed
Two one -watt, wire -wound resistors (one fixed and
one variable) are the only components necessary to
carry out the fixed to free-running conversion.
There are, however, a few circuit alterations; Fig. 1
shows the circuitry around VI which has to be
changed.
To effect the modification, proceed as follows:
Disconnect the earthy end of R1 and R2. Connect
one end of a fixed 120ká2 resistor to the 250- h.t.
rail; the other to one end of a 100kff potentiometer.
The "free" end of the potentiometer has to be
connected :to the earth rail and the wiper to the
"free" ends of R1 and R2.
With the wiper of the potentiometer at the earthy
end, the fixed speeds will be as before, but they will
increase as the wiper is moved towards the h.t. rail
to give continuous coverage.
"Squaring-up the Square Waves"
A prominent rounding of the leading edge of the
square wave output of the gating oscillator takes
place on the higher
frequencies; 2kc/s and
above, the higher the
frequency the worse it
gets. Although careful
layout will improve
matters, the s t r ay
capacity of the valve
will cause some distortion. The result of this
distortion is a spike on
the signal across V2;
that the curve usually
starts about three-quarters of the way up the
leading edge.
To overcome this
problem the top portion
of the square wave has
been chopped. Instead
of using a Zener diode
(which would be expensive, since it would have
to operate at about 160
volts), a pair of
reversed diodes and a
potential divider have
been used. A circuit
showing the alterations Fig. 2: Clipper modifications
is given in Fig. 2. From to improve the square
wave
this it can be seen that output of the gating oscillator.
a potential divider,
comprising a 50k1 variable and a 12k1 wire -wound,
half -watt resistor, is inserted across the supply lines.
The diodes, which must be capable of withstanding
300 p.i.v. and a forward current of 10mA, are connected to the centre point from the anodes of Vla
and Vlb. The diodes are thus reversed biased when
the valve is conducting. When the anode voltage
rises to the predetermined level, in this case 160V,
the diode conducts and prevents any further
increase in amplitude. This has the effect of clipping
the waveform at the wanted voltage level and thus
eliminates the distorted portion of the square wave.
RA can, of course, be replaced with a fixed resistor
once the optimum value has been selected. A small
improvement may be found if a 0.05 µF capacitor
is put across RB.
When carrying out this modification, it is
advisable to look at the signal on the anodes of V2.
It should appear as a square wave, reducing to zero
as VR1 (in the original circuit) is advanced to the
mid position. Any distortion from the oscillator
will appear as spikes, which VR1 will have no
control over.
Correction
The lead connections from Pin 2 and Pin 7 of
V1 in the original circuit diagram of the trace
doubler (page 1077) are incorrect. They should be
transposed to give cross coupling.
PRACTICAL ELECTRONICS
DECEMBER ISSUE
the width being proportional to the percentage of the curve
to the square on the
waveform. If a careful
study of the anode or
Fig. 1: Modifications to the
gating oscillator VI to give
output waveform is
made it will be seen
continuous coverage
50c/s to 5kc/s,
INTEGRATED STEREO AMPLIFIER
MODEL TRAIN CONTROLLER
from
SPECIAL SERIES
THE ELECTRONIC ORGAN
ON SALE NOVEMBER 10 2/6
609
No. 12
TN November
1965 steps were taken to show the
full series of Mullard technical films to all interested in electronics and who lived in the Cardiff
area. Arrangements were made to show the films
at the Penarth Secondary School, St. Cyres Road
(where we still meet) and the organisation was called
The St. Cyres Electronics Group. We had to borrow
a projector, and these and other technical films were
shown until March to very appreciative members.
On May 16th we adopted a Constitution, elected a
Committee, changed our name to The British
Amateur Electronics Club, and we were off!
The first thing we did was to arrange for the
public to play with an electronic shooting gallery
during Penarth Holiday Week and we were allocated the shelter on the promenade. Having got the
go-ahead from the Council we then had to design
and make it! To cut a long and unbelievable story
short we did, in fact, have a modified game ready
just in time (well, two hours late!) and we raised
£38 for the British Empire Cancer Campaign during
the week.
In June we published our first Newsletter which
contained details of the aims and policy of the
B.A.E.C. and all prospective members were sent a
copy. Much to the surprise of our members a second
Newsletter was published in September, and apart
from details of the electronic games played during
the Holiday Week it gives details of our future
programme of meetings.
The electronic games we make are designed to
incorporate different types of electronic circuits
(counters, and gates, S.C.R.'s, etc.) and during our
THE BRITISH AMATEUR
ELECTRONICS CLUB
meetings we will be investigating the principles and
operation of all types of electronic devices and
circuits with the aid of electronic test equipment,
and then incorporate them in the games. During
Penarth Holiday Week next August we hope to have
a few new games ready and do better than this year,
particularly as we have more time in which to
prepare.
Our membership fee is 10s. per year and out of
this we pay for all electronic components used in
the electronic games we make. The British Amateur
Electronics Club is for all who are interested in
electronics as a hobby, and it is hoped that more
who live too far from Penarth to attend our meetings will join and exchange ideas through the Newsletter. To encourage this the B.A.E.C. has a scheme
whereby electronic groups in other parts of the
country can join as a whole, and if more than half
their members are individual members of the
B.A.E.C. then they can receive free electronic components up to 40% of their individual membership
fee for any electronic project they plan which is
approved by the committee of the B.A.E.C. This
40% would be the cost price plus postage, and as
the B.A.E.C. can buy in bulk very cheaply indeed
this idea could mean the difference between doing
and not doing.
As has been shown in this summary we are a
young club but very ambitious and full of ideas.
To carry out our policy of catering for all who are
interested in electronics as a hobby (and that includes radio) we need more members, so if you
would like more details please write to the Hon.
Secretary, Mr. R. E. Cullen, 4 Roseberry Road,
Penarth, Glam., and he will, without hesitation, send
you our first Newsletter!
THE AMATEUR BANDS
-continued from page 594
SM5JW, SP5AKG, TI2LA, ZE1AN, ZE8SKI,
ZPSKT, ZS4RI, 4X4GY, 5A2TI, 5N2AAF, 5Z4GS,
9J2-DT, DX, MM, VX, 9Q5BD, 9X5MH.
News and Views
Contests for November include: 12th-13th,
7Mc/s DX contest (c.w. section); 19th-20th,
Topband contest (second); December 4th, Fourth
70Mc/s contest (c.w.).
What to look for and where? Well, try the 1.f.
end of 1.8Mc/s for W's on c.w. Almost any time on
14 and 21Mc/s for DX. Don't forget 7Mc/s still
provides a challenge if you find DX too easy on
14 and 21.
How about 80, very few reports these days for
this band. Finally, every time you switch on the
gear-a quick listen on 28Mc/s. You never know
what you might hear these days.
PS-G3JDG is loose on topband with 10 watts into.
140ft. end fed. You have been warned! Deadline
for this month is 27th.
610
THE GIFT WITH JUST THE RIGHT
FREQUENCY
What better Christmas present could you
give a radio enthusiast than a whole year's
subscription to PRACTICAL WIRELESS? With
every month of the coming year, he'll thank
you for the help and interest this absorbing
"practical" magazine brings him.
Simply send your friends' names and addresses, together with your own, and remittance to
cover each subscription, to The Subscription
Manager (Z1), PRACTICAL WIRELESS, Tower
House, Southampton Street, London, W.C.2
Your friends will receive a Christmas Greetings
Card announcing each gift.
RATES (INCLUDING POSTAGE) FOR
ONE YEAR (12 ISSUES), U.K. AND OVER:
SEAS £1 16s. Od. U.S.A. $5.00.
To make sure of your own copy why not
place a regular order with your newsagent?
SINCLAIR STEREO 25
DE -LUXE PRE -AMPLIFIER AND CONTROL
F
N\
A revelation in quality and economy
THE SINCLAIR STEREO 25 has been designed specially to ensure the
highest possible standards of reproduction when used with two Z.12s
or any other first class stereo power amplifier. Best possible components are used in the construction of this superb unit, whilst its appearance reflects the professional elegance characteristic of all Sinclair
designs in hi-fi, radio and TV. The front panel of the Stereo 25 is in solid
brushed and polished aluminium with beautifully styled solid aluminium control knobs. Mounting the unit is simple, and power is conveniently obtainable from the Sinclair PZ.3 which can also be used to
supplytwo 2.12s to make a complete stereo assembly. Hi-fi enthusiasts
The
set
that
stole
seeking the ultimate in domestic listening will find all they want from
this combination of Sinclair units. With a Micro FM for tuner, they
will have an installation to compare favourably with anything costing
from four to five times as much.
the
show
IDEAL FOR USE WITH TWO Z.12s AMPLIFIER
THE WORLD'S FIRST POCKET TV
TECHNICAL SPECIFICATIONS
THE SINCLAIR MICROVISION POCKET TV
RECEIVER provided a world wide sensation when
shown for the first time at the 1966 Radio and TV
Exhibition. This fantastic British set tunes over 13
channels on bands 1 and 3, operates from six selfcontained "Penlite" batteries and measures only
4in. x 2in. x tin. Despite the minute proportions of
this 30 transistor receiver, quality from the exclusively designed tube and loudspeaker is superb. This
amazing Sinclair triumph will be available early in
1967 at a cost of 49 gns.
l
UNIT
Performance figures obtained with the Stereo
25 fed to two Z.12s and a PZ.3 mains power
supply unit.
TONE CONTROLS
In SENSITIVITY
SIZE-t3in.
for 10 watts into 1.5
ohms load per channel.
Mic.-2 mV into 50K ohms.
Pick -up -3 mV into 50K ohms.
Radio-20 mV into 4.7K ohms.
NI FREQUENCY RESPONSE (Mic. and
Radio)-25c/s. to 30 kc/s. 1dB extending
to 100 kc/s ±3dB.
f
SINCLAIR MICROVISION
Available early 1967
1
EQUALISATION-Correct to within
± d B on RIAA curve from 50 c/s to 20 kc/s
1
FULL SERVICE FACILITIES AVAILABLE TO ALL SINCLAIR CUSTOMERS
Treble +12dB to -10dB at
Bass+l5dB to -12dB at
x
2,in.
x
10 kc/s.
100 c/s.
Olin. overall, plus
knobs.
FINISH-Front
panel
sectioned in
and polished solid aluminium
with solid aluminium knobs. Black
figuring on front panel.
brushed
BUILT,
TESTED AND
GUARANTEED
£9.19.6
ALL PURCHASES GUARANTEED
SINCLAIR RADIONICS LTD, 22 Newmarket Rd., CAMBRIDGE
Telephone 52996 (STD Code OCA3)
Order form
and more Sinclair designs on pages
following
611
2 SETS THAT NAVE CHANGED THE FACE
Nothing has ever equalled Sinclair
designs for compactness and efficiency
and the Micro -6 and Micro FM are now
world famous examples of what can be
achieved by specialisation in transistor
electronics. Countless thousands of
MICRO FM
these sets have been built to the delight
fulfills
a very real need in
terms of present day listening requirements, and anyone can easily build
both sets by following the well prepared instructions supplied with each
kit. Proof of their success is found in
the never ending stream of enthusiastic
letters constructors send us. Here are
yet more typical examples.
In its class
MICRO FM
have now completed installation of
the Micro FM after being lost in admira-
"We
tion for the superb construction. Results
are beyond praise. The quality is perfect.
In fact I haven't done a stroke of work
since we finished it. Please thank all
for a first class job. We are thrilled
with it."
C.E., Lowick, Berwick -on -Tweed.
"I should like to express my very considerable satisfaction with the performance of the Micro FM. You have
clearly designed a very efficient circuit
with first rate overall performance. I am
more than pleased."
L.E.H., Harrogate.
Complete kit inc. telescopic aerial, case, earpiece and instructions.
£5.19.6
understand."
R.R., Spanish Town, Jamaica.
Z.12
"The results are outstanding when used
with a good quality speaker."
P.O.S., London. E.13.
F.M. TUNER/RECEIVER
ready to use the moment you have built it.
The pulse counting discriminator ensures
best possible audio quality; sensitivity is
such that the telescopic aerial included with
the kit assures good reception in all but the
very poorest reception areas. The Sinclair
Micro FM give will you all you want in FM
reception and the satisfaction of building a
unique design that will save you pounds.
Self-contained double -purpose FM superhet using
7 transistors and 2 diodes. The R.F. amplifier is followed
by a self -oscillating mixer and three stages of I.F. amplification which dispense with I.F. transformers and all
problems of alignment. The final 1.F. amplifier produces a
square wave which Is converted to produce the original
modulation exactly. A pulse -counting discriminator
ensures better audio quality. One output is for feeding
to amplifier or recorder and the other enables the Micro
FM to be used as an independent self-contained pocket
portable. A.F.C. "locks" the programme tuned in. The
telescopic aerial included is sufficient in all but the worst
signal areas.
2¡áx 1}}xáin.
** Size:
Powerful A.F.C.
counting discriminator
** Pulse
Low I.F. completely eliminates alignment problems
from
to
Me)s
** Tunes
Audio response: t0 to
c/s±1dB
to Noise Ratio: 30dB at
* Signal
microvolts
from standard 9V battery,
** Operates
self-contained
case with brushed and polished
* Plastic
aluminium front and spun aluminium
68
108
20,000
30
tuning dial
SIX -STAGE MEDIUM WAVE
A.M. RECEIVER
The smallest radio set in the world!
MICRO -6
"A truly excellent kit.
The finish and
general quality is very good. It is fanso compact."
be
radio
can
a
that
tastic
N.R.C., Bishop's Stortford.
"Reception and sound Is superb. I
found the Instructions very easy to
RADIO
7 TRANSISTOR SUPERHET
This unique, superbly engineered superhet
FM set is completely professional in styling
inside and out. Its performance is fantastic.
It is the only set in the world which can be
used both as an FM tuner and as an independent FM pocket receiver just whenever you
wish. Problems of alignment which previously made it almost impossible for a constructor to complete an FM set for himself
have been completely eliminated. This set is
TECHNICAL DESCRIPTION
of constructors all over the world. Each
OF
This is the set against which a matchbox looks enormous.
Yet it is completely self-contained, including aerial and
batteries and virtually plays anywhere. Its clever six stage circuit (2 R.F., double diode detector, 3 A.F.) ensures
all you want in a radio today-power, range, quality and
selectivity. A.G.C. counteracts fading, bandspread
brings in Luxembourg like a local station. There is great
pleasure to be had in building the Micro -6, and it makes
a highly acceptable gift with its white, gold and black
case and amazing performance.
Size:
13/10" X112"
Weight: One Ounce
Easily built in an evening
Complete kit with
earpiece, case and
instructions.
59/6
FULL SERVICE FACILITIES AVAILABLE TO ALL SINCLAIR CUSTOMERS
SINCLAIR RADIONICS LTD, 22 Newmarket Rd., CAMBRIDGE
Telephone 52996 (STD Code OCA3)
612
'
SINCLAIR Z.12
12 WATTS R.M.S. OUTPUT
CONTINUOUS SINE WAVE (30W.
PEAK)
COMBINED 12 WATT HIGH-FIDELITY
AMPLIFIER AND PRE -AMP
IDEAL FOR HI -Fl (STEREO OR MONO)
CAR RADIO, ELECTRIC GUITAR, P.A.,
INTERCOM, ETC.
TRANSISTOR
CIRCUIT WITH
CLASS B ULTRALINEAR OUTPUT
8
The amazing adaptability and rugged construction of this very powerful and exceptionally
compact amplifier make it possible to use just
one type of unit with outstanding success in an
unusually wide variety of applications. Eight
special H.F. transistors are used in a highly
original circuit to achieve the characteristics
demanded of any quality amplifier irrespective
of price, yet this Sinclair unit costs well under
£5, including its own integrated pre -amplifier.
The Z.12 accepts radio, microphone and pick-up
inputs. Detailed instructions for connecting
these in mono and stereo are given in the manual supplied with every unit. A number of
different control networks are also shown. The
Z.12 will operate efficiently from any supply
between 6 and 20 v.d.c., making it very convenient to run the amplifier from a car battery.,
Where it is required to run the Z.12 from mains
supply, the PZ.3isrecommended.Thosewishing
to have a ready made pre -amp control unit can
feed inputs via the Stereo 25, which, with two
Z.12s will provide the finest stereophonic hi-fi
possible-and the saving in cost is fantastic.
TECHNICAL SPECIFICATIONS
Size 3 in. x 1 áin. x 1 áin.
Class "B" ultralinear output
SINCLAIR PZ.3
POWER SUPPLY UNIT
This special power
supply unit uses
advanced transistorised circuitry to
achieve exceptionally good smoothing. Ripple is a
barely measurable
0.05 v. The PZ.3
will power two
Z.12s and a Stereo
25 with ease.
I-
Built, tested and
f
RESPONSE 15-50,000 c/s
1 dB.
Suitable for 3, 7.5 or 150 speakers. Two 30 speakers
may be used in parallel
INPUT-2mV into 2k52.
OUTPUT -12 watts R.M.S. continuous sine wave
(24 w. peak); 15 watts music power (30 w. peak)
Signal to noise ratio better than 60dB.
Quiescent current consumption-15mA.
To: SINCLAIR RADIONICS LTD.,
22
guaranteed.
Ready for
immediate use.
With Z.12
manual.
89/6
YOUR SINCLAIR GUARANTEE
If you are not completely satisfied when
you receive your purchase from us,
your money will be refunded at once in
full and without question.
If you prefer not to cut this page, please
mention PWf 2 when writing your order.
NEWMARKET ROAD, CAMBRIDGE
P/ease send items detailed below:
I NAME
I
79/6
ADDRESS
Sinclair Stereo 25
DE -LUXE PRE -AMP. AND CONTROL UNIT
PLEASE TURN TO PAGE 611
for
which I enclose cash/cheque/money
ordernew
613
Practical Wireless Classified Advertisements
The pre-paid rate for classified advertisements is 1/6d. per word (minimum order 18/-), box number 1/6d.
extra. Semi -displayed setting £4. 12s. 6d. per single column inch. All cheques, postal orders, etc., to be
made payable to PRACTICAL WIRELESS and crossed "Lloyds Bank Ltd." Treasury notes should
always be sent registered post. Advertisements, together with remittance, should be sent to the Advertisement Manager, PRACTICAL WIRELESS, George Newnes Ltd., Tower House, Southampton Street,
London, WC2, for insertion in the next available issue.
EDUCATIONAL
SITUATIONS VACANT
RADIO OFFICER training courses. Write:
Principal, Newport and Monmouthshire
College of Technology, Newport, Mon.
A.M.I.Mech.E., A.M.I.E.R.E., City & Guilds,
G.C.E., etc. Become a Technician or Technologist for high pay and security. Thousands
of passes. For details of Exams. and Courses
in all branches of Engineering, Building,
Electronics, etc. write for 132 page handbook
-FREE. B.I.E.T. (Dept. 169K) Aldermaston
Court, Aldermaston, Berks.
RADIO OFFICERS see the world! Sea -going
and shore appointments. Trainee vacancies
during 1967. Grants available. Day and
Boarding students. Stamp for prospectus.
Wireless College, Colwyn Bay.
CITY & GUILDS (electrical, etc.) on 'Satisfaction or Refund of Fee' terms. Thousands
of passes. For details of modern courses in all
branches of electrical engineering, electronics,
radio, T.V., automation, etc., send for 132
page Handbook-FREE. B.LE.T. (Dept.
168K) Aldermaston Court, Aldermaston,
Berks.
RADIO AND TV Exam. and Courses by
Britain's finest Home -study School. Coaching
for Brit.I.R.E., City and Guilds Amateur's
Licence, R.T.E.B., P.M.G. Cert., etc. FREE
brochure from BRITISH NATIONAL RADIO
SCHOOL, Russell Street, Reading.
SERVICE ENGINEERS. Due to re -organisation and expansion vacancies exist for a number
of Radio and Tape Recorder Engineers in the
Service Department. A varied range of equipment is handled which will offer plenty of scope
for experienced men to use their knowledge and
initiative. Good starting rates are offered to
suitable applicants who will progress to Staff
status.
Apply: Service Manager, ELIZABETHAN
ELECTRONICS LIMITED, Bridge Close,
Romford, Essex.
TRAIN FOR SUCCESS
WITH ICS
Study at home for a progressive
post in Radio, TV and Electronics. Expert tuition for I.E.R.E.,
City & Guilds (Telecoms and
Radio Amateurs') R.T.E.B., etc.
Many unique diploma courses
incl. Colour TV, Electronics,
Telemetry & Computers. Also
self-build kit courses-valve and
transistor.
(continued)
RADIO TECHNICIANS
A number of suitably qualified candidates
are required for permanent and pensionable
employment. (In various parts of the UK,
including London, but primarily Cheltenham.
Also opportunities for service abroad.)
Applicants must
T.V. AND RADIO-A.M.I.E.R.E., City &
Guilds R.T.E.B. Cert., etc., on 'Satisfaction
or Refund of Fee' terms. Thousands of passes.
For details of Exams and home training
(including practical apparatus) in all branches
of radio, T.V. and electronics, write for 132
page Handbook-FREE. B.I.E.T. (Dept.
137K) Aldermaston Court, Aldermaston,
Berks.
ICS DEPT. 541 PARKGATE ROAD
LONDON, S.W.11.
City and County of Bristol
BRISTOL TECHNICAL COLLEGE
Principal: E. Poole, B.Sc.Eng., M.I.Mech.E., M.I.Prod.E.
CAREERS IN RADIO
Marine Radio Officers
&
RADAR
be 19 or over and be
familiar with the use of Test Gear and have
had Radio/Electronic workshop experience.
They must offer at least "O" level GCE passes
in English Language, Maths and/or Physics,
or hold the City and Guilds Telecommunications Technician Intermediate Certificate
or equivalent technical qualifications.
Pay according to age, e.g. at 19 £747,
at 25 £962 (highest age pay on entry)
rising by four annual increments to £1,104.
Prospects of promotion to grades in
salary range £1,032-£1,691. There are a
few posts carrying higher salaries.
Annual
Leave
allowance
3 days, rising to 4
Write for FREE prospectus and find out
how ICS can help you in your career.
of
weeks
3
weeks 2 days.
Normal Civil Service sick leave regulations
apply.
Apply
Recruitment Officer (RT 54)
Government Communications
Headquarters
Oakley, Priors Road
CHELTENHAM, Glos.
MISCELLANEOUS
CONVERT ANY TV SET into an Oscilloscope.
Diagrams and instructions 12/6. REDMOND,
42 Dean Close, Portslade, Sussex.
Licensed Aircraft Radio
Engineers
course for young men
aged 16 upwards, leading to 1st and 2nd
class P.M.G. Certificates and B.O.T. Radar
2 -year
SITUATIONS VACANT
full-time
2 -year, full-time course for A.R.M.E. Licences,
categories A Et B, and 6 -months courses
for Radar Rating in association with the above.
Maintenance Certificate.
Conversion Course (2nd Class to 1st Class).
BERNIESOUND (AUDIO
ENGINEERS)
Design-Build-Repair -Modify
All types of Electronic Equipment
For estimates write to:=
Mr. Brown,
1
Effie Place, London,
S. W.6.
R.T. Course (for Full or Restricted Licence).
Training given on the latest types of Marine and Aircraft Equipment in newly equipped
Labora orles at
THE SCHOOL OF
MARINE RADIO AND RADAR
Senior Lecturer:
For details write to:
F
E.
BARLTROP
THE REGISTRAR
BRISTOL TECHNICAL COLLEGE
ASHLEY DOWN, BRISTOL 7
614
ELECTRONIC MUSIC
Then how about making yourself an electric
organ? Constructional data availablefull circuits, drawings and notes! It has
5 octaves, 2 manuals and pedals with 24
stops-uses 41 valves. With its variable
attack you can play Classics and Swing.
Write NOW for free leaflet and further
details to C & S., 20 Maude Street,
Darlington, Durham. Send 3d. stamp.
TAPE RECORDERS, TAPES, Etc.
-
TAPES TO DISC
using finest professional
equipment 45 rpm -18/-.
S.A.E. leaflet,
DEROY, High Bank, Hawk Street, Carnforth.
Lancs.
RECEIVERS & COMPONENTS
R Et R
RADIO
Et
TV SERVICE
Dept. P.W.
MARKET STREET, BACUP, LANCS.
Telephone 465
SALVAGE VALVES
6F13
6L18
EF80
ECC82
ECL80
30F5
PCF80
PL81
PZ30
4/6 U329
416 10P14
1/6 20P5
3/3/6
5/-
4/5/5/-
301,
6F15
EB91
EF85
6/30L2
20P3
5/5/6/6
7/5/1/5/4/6/-
Tested before despatch
30PL1 4/- 20P4
6/6
PL36
6/- PC084 4/PL82
3/6 PY81
8/6
U801
7/6 17301
6/10F1
1/6 10P13 5/6
30FL1 5/- 2001
2/PY32
61- 30P12 5/6114GT 5/- PY83
5/EY86
4/ -
Speakers. Ex.TV. 51n. round 6 x 4in., 3/6; Bin. round 6/-;
post 2/-.
Line Output Transformers available. State set model No
Turret Tuners, 8/-, post 2/-.
Scan Coils, etc. Quote set model No. with all enquiries
and S.A.E. for prompt reply. All goods subject to satisfaction or money refunded.
'BY 100 rectifiers 4/- each any quantity. Post
Paid. BLAKE, 52A, Runcorn Road, Birmingham 12.
Set WTs, complete with 15 valves and 2
crystals. Operate up to 48 MEG tunable with
circuit and details. No rear case. 25/- each.
Part post 5/-.
Spare Set Valves and Crystals, 12/6.
Chassis less valves, 12/6. P. & P. 5/-.
No other spares available.
Assorted High Stab Resistors, 7/6, 100.
Assorted Syflex P.F. Condensers, 7/6, 100.
Paxolin Sheet, a, - x 12" x 12', 3/-.
Thin Paxolin Sheet, approx. r/s4" x 12' x 12",
6 sheets for 5/-.
White Plastic Sheet, approx, 1/te" x 6i" x 24".
Suitable dials, insulation, case fronts, etc.
4 sheets for 5/-.
Small E.M. Counters, 5 digit, 500 ohm, 6/6.
Bulgin Extra Sensitive Micro Switch, 5/-.
P.O. Relay 2000 ohm, 10, 5/-, 1M, ID 6/-.
Key Switches, 4 pole, 2 throw, 3/6. 3 position
DP+DP centre off, 5/-. 3 c/o+4 c/o centre off,
61-. DP+DP 2 for 51-.
Plessey Plugs and Sockets, 12 way, 31-pr. 6 way,
31
5/- pr.
6 or 12 way screened cable to match, 3l- yd.
Breast Mike, 61-. Carbon Inserts, 1/6.
Battery Ever -Ready, 90v+71v, 4/6, 12 for 30/-.
Small Component Boxes, 12/6, for 60 samples 6d.
Mg Metal Screen for 5µP7 with fittings 6/6.
250mA Fuses l," x 0", 5/-, 100.
100 volt Hand Generator, 7/6c
Rheostat WW Rotary, 15 ohms, 3.6 amp, 12/6.
Details of Instrument Case Assembly. Free,
send large addressed envelope.
Elac Speakers, 5", 5/-. 7" x 4", 7/-. 8", 8/-.
Rotary Transformer. Input 12 volts, output
490v at 65mA, 9/-.
Rotary Transformer. 12v. input, 300v output.
at 0.2 amp., 351-.
Modern lightweight Breast Mikes, Polythene
fittings. New, 7/6, spare insert 2/6.
Ernest Turner meter 2$' fitting (round) 1-0-1M/A.
Centre zero, 12/6.
Carpenters relay type 3SE1. 250 ohm+200 ohm
each side. Fitted with plug in base, 17/6 each.
Type 3000 P.O. relay. New 6000 ohm coil, 2 sets
of change -over, 8/6.
Transistors 2G302, 2/-.
Printed circuit board. 11' x 55" ideal for reuse
with 28 diodes CV448 plus some high stab resistors, 10/- post paid.
A new range of instrument cases ready send for
free list. S.A.E. please.
E.
R.
NICHOLLS
Mall Order and Retail Shop
46 LOWFIELD ROAD
Off SHAW HEATH, STOCKPORT
CHESHIRE
RECEIVERS & COMPONENTS
RECEIVERS & COMPONENTS
(continued)
(continued)
"HEATHKITS" can now be seen in London
Heathkits Q Multiplier 1.6Mcs I.F., £5.
Crystal Calibrator 1Mcs £3. MGP-1 Power
Unit £3. Brand new. Unused. Bonner, 24
Kirkland Road, Braunstone, Leics.
and purchased on easy terms. Free brochure.
DIRECT TV REPLACEMENTS LTD., Dept.
PW7-9, 126 Hamilton Road, West Norwood,
S.E.27. GIPsy Hill 6166.
ARMATURES
POWER TRANSISTORS 3/- each!!!
Genuine OC16 equivalents at lowest price ever
PNP SILICON transistors 2S302 at 3/6 or
2S306 (higher gain) at 5/6.
PNP/NPN pair type 2G345/b at 5/- pair.
MULLARD: part of our extensive range
AF114/5/6/7 0075 AC128 all at 4/- each
0C170 at 4/- and the low noise version OC171
at 7/6.
DIODES 0A70 81 95 at 1/3 each OA91,
0A202 at 2/- and special TEXAS sil. rectifier
Immediate Exchange Service All Makes Vac.
Armatures. From 27/6d. Quantity Discounts
Lists.
Jervis-Tonge Ltd.
Industrial Estate, Derby Road,
Clay Cross, Derbyshire
Tel. Clay Cross 2398, 2598
15100 at 1/6 (takes 100 volts piv at 750 ma).
BARGAIN PACKS: 5 Red spots plus 5 white
spots 10/-.
6 NPN Silicon high and low voltage 10/25 Audio Transistors 2G371/81 10/ -
COMPONENTS, transistors ex-W.D. and
surplus. Call at ROGERS, 31 Nelson Street,
Southport. (List 6d stamp.)
POT'S: Bargain wirewound potentiometers
2.5k ohms at 1/- each or 3 for 2/6. (With
spindle locks included).
POSTAGE: add 9cl please for orders under 10/-.
NEW COMPONENTS
L.S.T. COMPONENTS
23 New Road
*
Brentwood Essex
and don't forget to send for our OCTOBER
CATALOGUE 6d.
*
RESISTORS, new, 5 %, 4-W, 2/3 doz, 17/3 per
100. 4.70 to 1012, your selection. By-return
service. ELECTROVALUE, 6 Mansfield
*
CRYSTAL FILTERS
*
Designed for the home constructor.
TYPE P1/2, bandwidth 3 Kc. Plug-in unit on
octal base.
Only £3.17.6, post 1/-.
Standard model 467 Kc. Requires no special
I.F. transformers. Other types available at
£4.10.0. Send stamp for full details of these
*
Place, Ascot, Berkshire.
TRANSISTORS-Matched
Output Kit:
0081D and 2-0081
,
9/6
R.F. Kit: 0C44 and 2-0045
9/6
0044, 45, 70, 72, 81 and 81D Equivalents,
RESISTORS-5% Hi -Stab Carbon Film 7513
15112 (1 watt); 10 off, one preferred
to
CAPACITORS -Polyester
Foil: 160 VDC/
100 VAC.
33 pF to .1)1,F:5 off, one preferred value 3/6
.15µF to .47 yF:5 off, one value ..
.. 5/ASSORTED CAPACITORS-New
Paper,
Polyester, Eiectrolytic etc. 100: off
.. 9/6
ASSORTED RESISTORS -Hi-Stab. 300 off
(5% or better, worth £3)
.. 15/(P. & P. 1/6 per order, C.W.O.)
ELMBRIDGE INSTRUMENTS LTD.
Island Farm Avenue, West Molesey, Surrey
and other products.
G. ELLIOTT
3 Sandgate Avenue,
DI
Tilehurst, Reading, Berks.
(continued on next page)
PAK SEMICONDUCTORS
938/9
RADNOR HOUSE
ST R ET
REGELONDONT
LOW COST SILICON CONTROLLED RECTIFIERS (THYRISTORS) FACTORY TESTED
1 AMP (TO -5 can)
7 AMP (STUD)
16 AMP (STUD)
Free SCR Literature including
PIV
EACH
PIV
PIV
EACH
EACH
Circuit Diagrams for Light
8/6
50
100
100
10/6
16/6
Dimmers, Speed Controllers,
100
9/6
400
400
30/40/AC Power Switch, etc., with
200
12/6
600
45/600
55/SCR orders or on request.
22/6
400
25 PIA Power SCR 50 Amp, Special Price
35/ One 10/your own
LOGIC MODULS
choice free with orders
and/or,
Gates,
MemoryUnits,
valued £4 or over
Timer Units, etc., details free
TRANSISTORS
UNTESTED
FREE
FREE
FREE
-
PAK 50
NIXED
UNTESTED
00139 Trans. NPN Mallard
Drift Trans. 2N1225 100 31/Cs
Matched Trans. 0044/45/81/810
0A10 Diodes Mallard
Red Spot AP Trans. PEP
White Spot RF Trans. PNP
Sil. Rects. 3A 100/400 PIV
NPN Trans. 00139 2NI308, ETC.
10 Amp. Sil. Rect. 50/100 PIV
Diodes 4 0A70, 4 OÁ79
3 AMP SCR 100 PIV
Sil. Trans. 28303 PEP
2G344A Trans. Eqvt. 0044
Assorted Computer Diodes
Zeners 5, 6.8, 10, 12 Vita
20417 Trans. Eqvt. AF1116/7
200 M/Cs Sil. Trans. BSY26/7
Bi-directional Trans. ASY66
High Current Trans. 0C42
Power Trans. 0026/35
Sil. Reds. 400 PIV 250mA
0071 Tram. Mallard
0075 Trans. Mallard
NPN Sil. Trans. 70 M/Cs
Power Trans. OC20 100 Vlts
VALUE
3
2
6
4
15
15
4
4
2
8
1
3
10/10/10/10/10/10/10/-
101-
10/10/10/10/10/5
10/10
10/4
10/4
10/2
10/2
10/4
10/2
10/5
10/3
10/3
10/3
10/1
10/5 0A47 Gold Bonded Diodes
10/4 0A202 Sil. Diodes Sub -Min
10/3 0077 Trans. Mallard
10/8 0A81 Diodes Sub -min
10/3 Sil. Rects. 400 PIV 500 mA
10/Our vast stocks change daily with hundreds of
Semiconductor bargains becoming available. Just
send 2/6 to cover 3 months mailing of our latest
stock lists, eqvt. charts, circuits, etc.
10
AGEERANGE
SCRr.SVOL
50-400 PIV
1
Amp20/-
High vit. AF Trans. PNP ACY17
15/5 Sil. Rect. 750mÁ 100 PIP TEXAS
15/3 BSY95A Sil. Trans. STC
15/3 Sil. Trans. 00200 Mallard
15/2 Sil. Power Rect. 6 Amp. 200 PIV BYZ13
15/1 AF139 GERM. Trans. 1500 M/Cs
15/1 8i1. Power Trans. 100 M/Cs STO BUY11
15/6 Freer Diodes 3-15v1ts. Mixed 400mW
15;5 0A5 Gold Bonded Diodes Mallard
15/1 2N1132 PNP PLANAR Trans. Sil
15/2 2E697 NPN PLANAR Trans. Sil
15/4 GERM. Power Trans. eqvt. 0016 Mallard
15/1 UNIJUNCTION Trans. 2E2646 G.E
15/2 Sil. Trans. 60VCB 200 M/Cs. ZT83/84
15/1 Sil. PLANAR Trans. BSY25 NPN l0003í/Cs 15/1 Sil. Trans. 16104 150 M/Cs HFE 200 NPN
15/2 SCR's 50 PIV 1 Amp. TO -5 can
15/1 Tunnel Diode IN370 (TD -5) G.E
15/1 2N2160 UNIJUNCTION Trans. TO -5 can
15/2 Sil. Rect. 5 Amp. 400 PIV Stud
15/1 Tunnel Diode TIC 19B STC. 1200 M/Cs
15/2 GERM. Power Trans. 0028/29
15/1 2N174 Power Trans. 150W. PNP le 159
15/6 Sil. Rect. Type BY100 800 PIV 550mÁ
20/8 Sil. Rect. 400 PIV 200/500mA
20/1 Transistor Manual by G.E. 648 pages
30/1 Silicon Controlled Rect. Manual G.E
30/25 Mixed Sil. a GERM. Trans. New Marked
30/40 Mixed Semiconductors New Marked
40/1 Logic Module Handbook & Catalogue
17/6
Minimum Order 10/,
CASH WITH ORDER
PLEASE. Add 1/- postage and packing per
Order. GUARANTEED by return postal service.
Overseas add extra for Airmail.
3
615
RECEIVERS & COMPONENTS
RECEIVERS & COMPONENTS
(continued)
(continued)
POST
Tests Transistors in or out of set
Tests both T.N.P. and N.P.N.
CHRISTMAS!
FOR
J. C. WOODWARD
Free
94 Great
Personal shoppers welcome
BROOK a HILL ELECTRONICS,
695/697 Seven Sisters Road,
London, N.15
(50 yds. from Wards Corner)
Brickkiln St., Wolverhampton
TRANSISTORS, UNMARKED, UNTESTED,
40 for 10/-,.p. and p. 11-, 4 packets post free.
Relays,, thousands of types, special catalogue
free. General catalogue of Mechanical and
Electrical Gear, Tools, etc. (5,000 items), free.
K. R. WHISTON (Dept. PRW), New Mills,
Stockport.
Shipping
Amateur,
A Broadcast. Magnificent 10 valve receiver in
three switched wavebands covering L75-
8/6 TIN
JUST ERIISH ON
WITHSTANDS 150°C, OIL, WATER ETC.
24 oz. tins
8/6
4 gallon
s5/-4
1
pint
pint
....
716
15/-
1
gallon
1 sent byroad)
58/.e
Carriage: Orders up to 5/-, 9d.; up to 10/., 1/9;
over 10/-, 2/9. Colours: blue, silver, black or bronze.
Return of poet service, Monday to Friday.
From your component shop or direct from the
manufacturer:
FINNIGAN SPECIALITY PAINTS (PW)
Mickley Square, Stecksfleld, Northumberland.
Tel. Stocksfield 2280.
16 Mc /a
(19 -
170
metres),
plus
valve cryS
etal cali-
brator, employing dual crystal to provide marker
check at 10-100-1000 kc/s. One BF and two IF
otages. Other refinements: valve, HT, and Signal
check meter. Internal Sin. speaker and two H/
Phone outputs with ewitched control FR-AF
Gain, Noise Limiter, Filter, BFO, Heterodyne pitch
controL Wide and Narrow Bandwidth Man. or
AVG on OW & RT. Fast and Slow tuning with lock.
Additional OSO Tuning (plus & minus). Size
15 a 14 a 12in. Fully tested and working. A.C.
Maine 200/240v. 214. Carr. (1.
No. 62 GROUND -STATION comprising Receiver,
Transmitter and 12v. D.C. Power Unit, 427.10.0.
Carr. 42.10.0. (Mainland only).
NATIONAL H.R.O. SENIOR RECEIVERS
5T MODEL
In excellent tested
condition.
Complete
with 9 coils 50 Eels 10 Mete and Power
Unit. 451.10.0 Carr.
-
-
m
1
nae
ALL 19 SETS AND PARTS AVAILABLE
Complete fiat of other bargains. 11-.
S.A.E. all enquiries. Credit Terms Available.
A. J. THOMPSON (Dept. P -W.)
"TILING LODGE", CODICOTE, BITCSIN, RENTS.
Phone: CODICOTE 242
616
0071, 0081, OC81D, 0C200,
GET16, GET20.
4/-
each. ÁF114, AF115, AF116.
AF117, 0C170, 0C171.
GET9,
XC141,
GET7,
BY100,
BSY27 7/6 each 0C20 10/- each
ZENER DIODES
All volts between 3.9v. and 26v.
Qw 3/6 each, 1.5w 5/- each,
7w 6/- each.
Send 6d. for full lists:inc., S.C.R., Zeners.
CURSONS
Brand new 7 transistor portables. Bargain at
551- post free. THE COMPONENT COMPANY, 22 River Close, RUISLIP, Middlesex.
List S.A.E.
78 BROAD STREET
CANTERBURY, KENT
SPECIAL OFFER
FIVE -TON FACTORY CLEARANCE: Radio,
TV Electrical Components in mixed parcels.
Example: 221b. mixed parcel £1, p.p. 7/6.
Speakers, grilles, valves, bases, i.f.s. covers,
condensers, etc. Hundred other items. S.A.E.
list and postal order to P. NEWTON, 16
Shalcross Crescent, Hatfield, Herts.
GEVAERT TAPE. New, Boxed 51, 600ft.
with Stop and Leader Tapes, 9/- or 6 for
50/- post paid.
GRÚNDIG 114AL 2 Transistor Pre -amps
for Tape Monitoring or Microphone
Boosters, 57/6, post paid.
LIST PRICE 4 GNS.
LEE ELECTRONICS
400 Edgware Road, Paddington 5521
Send for Free Lists and details of above
WANTED
VALVES WANTED brand new popular
types boxed. DURHAM SUPPLIES (C),
s0/-.
REJECTOR UNITS 1.2-10 Mo/s
Switched, 4 ranges. Primarily
designed as station rejector for
Suitable for harmonic
R.O.
suppression and many other
aces with slight alteration.
Tuning dial with lock. Aerial
in and eut sockets. Brand
New 25/-. P. & P. 5/,
4 VALVE 4 WATT AMPLIFIER
"0" Core transformers
A.C. Mains 110/280 volts
---600 ohms of high imped.Il
anse input. Output 3 or
LI
1
800 ohms (state choice)
rs
Controls: Oa/Off switch
44
Gain control. Indicator
hght. Valve inspection panel. 19 a 7 a 7Mn. Brand
New in maker's carton, 79 6, Carr.10/-.
TELESCOPIC AERIAL MASTS.
Tubular steel
cop deed, spray finish, ring cam locking on each
section provides for full or any height required.
Suitable all fixings and base locations. Bottom
section 10n. diameter, 20ft. (4 section). Closed Sit.
91a Weight 161b. 55/-, Carr. 5/.. 34ft. (6 section).
Closed 65t. Bin. Weight 201b. 75/-, Carr. 5/-.
Further height by adding 3-4ft. Whip sections 13/8,
Carr. 4/-. Special price for quantities.
ROTARY TRANSFORMER. 12v. D.C. Input, 250v.
D.O. output at 125 mA. Size 34 a Olin. Brand new
17/8. P. & P. 5/-. Many othertypee.
R.F. ANTENNA TUNER (A.T.II.) Calibrated scale,
ideal 160/80/40 metres. Limited number only.
Brand new with instruction., 17/6. P. & P. 7/6.
3/- each. 0C44, 0C45, 0070,
0A211.
HHANIMERITE ANLMALWRK
MARCONI CANADIAN RECEIVER No. 52
watt S.T.C. 300 mc/s N.P.N.
Silicon Planar, Transistors limited
stocks £1 for 6.
WITH DATA
1
GETS,
HAMMER
.....
TRANSISTORS
SPECIAL OFFER
5/- each. 0C139, 0C140,
FOR SALE
...._.."
(continued)
-8
Transistor Testers
Price 30/- Battery and Post
EARLY
and get 40 semiconductors for £1 in my £5
value package containing:
Si ft Ge
transistors, 2 thyristors, 18 Si & Ge signal
diodes, 6 zeners, 6 Si rectifiers. Money -back
guarantee.
POCKET SIZE
FOR SALE
I
MORSE
175, Durham Road, Bradford 8, Yorkshire.
EASY
i
The Famous RHYTHM RECORDED COURSE
cuts the practice time down to an absolute
minimum.
One student, aged 20, took only 13 DAYS.
and another, aged 69. took under a week to
read 18 wpm. If you wish to read Morse easily
and naturally please enclose 8d. in stamps or
two international reply CoupOnaforfnjl explanatory leaflet to: GOCESIP
45 Green Lane, Purley, Surrey. UPLands 2896
ELECTRIC SOLDERING IRON
FANTASTIC
BARGAIN OFFER
Lightweight Pistol Grip handle
40 watt. 2401250v. A.C. Detachable
handle forms cover for iron when
not in use. With 44ít. Safety
3 -core flex.
Indispensable for
every
home handyman. A boon to model ONLY
makers and a necessity
for every wireless enthusiast.
Offered to
you at this new amazing Post
price.
Free
C. II. SERVICE (Dept. F.W.)
Lusted Hall Lane, Tatafleld, Kent.
WE BUY New Valves and Transistors. Stato
price. A.D.A. MANUFACTURING CO., 116
Alfreton Road, Nottingham.
DAMAGED AVO METERS wanted. Models
7 and 8.
Any condition. Any quantity.
HUGGETTS LTD., 2-4 Pawson's Road, West
Croydon.
WANTED NEW
VALVES ONLY
Must be new and boxed
Payment by return
WILLIAM CARVIS LTD
103 North Street, Leeds 7
WANTED: Popular Brand New Valves. R.H.S.
Stamford House, 538 Great Horton Road,
Bradford 7.
WE BUY New Valves for cash, large or small
quantities, old types or the latest by return. Send
details. Quotations by return. WALTON'S
WIRELESS STORES, 15 Church Street,
Wolverhampton.
BOOKS
SERVICE SHEETS
SERVICE SHEETS for all makes, Radio, T/V,
Tape Recorders, 1925-1966. Prices from 1/-.
Catalogue 6,000 models 2/6d. Free faultfinding guide with all Sheets. Please send
stamped addressed envelope with all orders/
enquiries. HAMILTON RADIO, Western
Road, St. Leonards, Sussex.
SURPLUS HANDBOOKS
..
Circuit and Notes
set Circuit and Notes ..
H.R.O. Technical Instructions
1155
set Technical Instructions
set Working Instructions ..
set Technical Instructions
SERVICE SHEETS. Radio and Television, 4/ post paid. A. VEST, 45 Edge Court, Durham.
8B
SERVICE SHEETS, Radio TV, 5,000 models.
List 1/-. S.A.E. inquiries. TELRAY, 11
Maudland Bank, Preston.
CR.100/6.28
BC.221
Circuit and Notes
Circuit and Notes
AR.88D Instruction Manual ..
..
62 set Circuit and Notes
Circuit Diagrams 3/- each post
5/- p/p 6d.
.. 15/- p/p
.
1/6
4/6 p/p 6d.
free. R.1116/A,
EQUIPMENT CABINETS
OF DISTINCTION
IIIIIIIIIIII111IIIIIIIIIIIIIIIIIIIIi11111111111111111111111I11IIIIL
S.A.E. with all enquiries please.
Postage rates apply to U.K. only.
Mail order only to:
INSTRUCTIONAL HANDBOOK
SUPPLIES
DEPT. PW, TALBOT HOUSE,
28 TALBOT GARDENS, LEEDS 8
have the largest display of Service
Sheets for all makes and types of Radios
and Televisions, etc., in the country. Speedy
service.
To obtain the Service Sheet you require
attached
,.
..
4/6 p/p 6d.
4/6 p/p 6d.
3/6 P/P 6d.
3/6p/p 6d.
3/6 p/p 6d.
5/- P/p 6d.
3/6 p/p 6d.
3/6 p/p 6d.
3/6 p/p 6d.
3/6 p/p 6d.
8/6 p/p 9d.
R.1224/A, R.1355, R.F. 24, 25 and 26, A.1134,
1.1154 (all models), BC.312, BC.342, BC.348J,
BC.348 (E.M.P.), BC.624. 22 set.
52 set Sender and Receiver circuits 6/- post free
Resistor colour code indicator, 1/6 p/p 6d.
We
the
..
..
..
R.107
4J- each, plus postage
complete
Circuit and Notes
Wavemeter Class D Tech. lnstr...
..
..
16 set Circuit and Notes
BC.1000 (31 set) Circuit and Notes ..
SERVICE SHEETS
please
PUBLICATIONS
(continued)
19 set
38
46
SERVICE SHEETS (75,000), 4/- each. Callers
welcome. Always open. 5 South Street,
Oakenshaw, Bradford.
-&
Imperial
PrII11111111IIIIIIHI1II11IIIllI11III1IIIIlllIIIIIll1IIIIIIIIIIIIIr
coupon.
Illustrated in this advertisement are
two fine cabinets from the Lewis
Radio Range.
These cabinets are just two of a
really extensive range.
Each one carefully made by British
Craftsmen and soundly constructed
from the best materials available.
Fill in coupon below to obtain FREE
catalogue showing this wonderful
range of cabinets.
Name:
METAL WORK
Address:
_
To; S.P. DISTRIBUTORS
30 Baker Street, London, W.1
Please supply Service Sheets for the following:
METAL WORK: All types cabinets, chassis
racks, etc., to your specifications. PHILPOTTS
METAL WORKS LTD., Chapman Street,
Loughborough.
_
NEW EDITION
Make:
RADIO VALVE
DATA
Radio/TV
Model No
Make:
Radio/TV
Model No.
CHARACTERISTICS OF 7,000 VALVES
SEMICONDUCTORS
TRANSISTORS
Make:
DIODES AND RECTIFIERS CATHODE
Radio/TV
Model No
RAY TUBES
require the new 1966 List of Service
Sheets at 1/6 each plus postage.
(please delete items not applicable)
Compiled "WW" 8th edition.
I
Postage 1 /-
(which includes postage)
(Dec.) PW
MAIL ORDERS ONLY
SOUND RECORDINGS
Top brand 7in.,
2,400ft., 25/-; 5Iin., 1,200ft., 15/-. P. and P.
I at 2/-, 2 at 2/9,-3-6 at 3/6. Bargains in all
sizes. S.A.E. for list. E.C. KINGSLEY AND
CO. LTD., 93 Tottenham Court Road,
'
London, W.I. EUSton 6500.
BOOKS
&
A detailed guide to thirty-one receivers,
including the HRO, AR88, CR100, R107,
R1155, PCR, 52 set, etc.
7/6, P. a P. 1/-. Mail order only to:
ADKINS, 72 Courtenay Ave, Harrow
Middlesex.
IIIIIIIIIIIIIIIr
r
7
J
THE NEW LEWIS
RADIO CATALOGUE
Designed to assist your choice of
Cabinet.
The New Lewis Radio Cabinet Catalogue -the most comprehensive ever
prepared. Sent absolutely FREE!
Please send your FREE cabinet catalogue.
QUESTIONS AND ANSWERS
RADIO Et TELEVISION
by H. W. Hellyer. 8/6. Postage 9d.
QUESTIONS AND ANSWERS
AUDIO
by C. Brown. 8/6. Postage 9d.
NAME
ADDRESS
QUESTIONS AND ANSWERS
ELECTRONICS
by C. Brown. 8/6. Postage 9d.
PUBLICATIONS
A GUIDE TO SURPLUS
COMMUNICATION RECEIVERS
Lowflex
9/6
QUESTIONS AND ANSWERS
TRANSISTORS
by C. Brown. 8/6. Postage 9d.
/enclose remittance of
A UNIQUE TAPE BUY!
;1IIIIIIIIIIIIIIIIIIIIIIII111111IIIIIIIIIIII1111111IIIII1II111IIIIL"
(Dept. P126)
Capitals please
THE MODERN BOOK CO.
1
BRITAIN'S LARGEST STOCKISTS
British and American Technical Books
19-21 PRAED STREET
LONDON, W.2
100
Closed Saturday
1
o'clock
Chase Side, Southgate, London N.14.
Tel.: Palmer's Green 3733 9666
Phone: PADdington 4185
L
J
617
YOUR CAREER in
SURBITON PARK RADIO
RADIO &
ELECTRONICS P
MARTIN
Big opportunities and big money await the qualified man
in every field of Electronics today-both in the U.K. and
throughout the world. We offer the finest home study
training for all subjects in radio, television, etc., especially
for the CITY & GUILDS EXAMS (Technicians' Certificates); the Grad. Brit. I.R.E. Exam.; the RADIO
AMATEUR'S LICENCE; P.M.G. Certificates; the
R.T.E.B. Servicing Certificates; etc. Also courses in Television; Transistors; Radar; Computers; Servo -mechanisms; Mathematics and Practical Transistor Radio course
with equipment. We have OVER 20 YEARS' experience
in teaching radio subjects and an unbroken record of
exam. successes. We are the only privately run British
home study College specialising in electronic subjects only.
Fullest details will be gladly sent without any obligation.
To: British National Radio School, Reading, Berks.
Please send FREE BROCHURE to:
NAME
Block
ADDRESS
Caps.
Please
12.66
BRITISH
NATIONAL
RADIO
SCHOOL
RECORDAKITS
NEW MAGNAVOX 363 DECK, Two Track
Cash £11.19.6
6 Valve amplifier complete 2 EL84
Cash £14.19.6
Complete recorder, Case, Tape, Mic
Cash £36.0.0
Or dep.180/- and 12 m. pymts. 49/6
(H.P. Price £38.14.0)
Cash 514.14.0
FOUR TRACK MAGNAVOX 363 DECK
FOUR TRACK AIPLIFIER as above
Cash £15.19.6
'Complete recorder, Case, Tape, Mic.
Cash £40.0.0
Or Dep. 200/- and 12 m. pymts. 55/(H.P. Price £43.0.0)
These recorders are very well made, The amplifier is on a printed circuit and
all components are mounted and tested. Can be built in 2 to 3 hours.
MOTORSPICK-UPS
Selection
GARRARD Model 1000 Mono
Or Dep. 37/6 and 8 m. pymts. 16/3
GARRARD Model 2000 Mono. Large table
Or Dep. 42/6 and 8 m. ponts. 18/6
GARRARD Model 3000 Stereo 9TA/11C
Or Dep. 58/6 and 9 m. pymts. 21/5
GARRARD Model AT60 Less cart.
Or Dep. 65/- and 9 m. pymts. 23/11
GARRARD Model SP25 Single player, less cart.
Or Dep. 62/6
and 9 m. pymts.
23/1
Cash £7.10.0
(H.P. Price £8.7.6)
Cash £8.10.0
(H.P. Price £9.10.6)
Cash 511.11.0
(H.P. Price £12.11.3)
Cash £13.0.0
(H.P, Price £14.0.3)
Cash £12.10.0
(H.P. Price £13.10.3)
AMPLIFIERS TUNERS° Selection
ARMSTRONG 22110-10 watts Stereo Mag PU and Filter ....Cash £35.10.0
Or dep. 177/6 and 12 m. pymts. 48/10
(H.P. Price £38.3.6)
ARMSTRONG 222 10-10 watt Stereo Deram
Cash £28.15.0
Or Dep. 147/6 and 12 m. pymts. 39/3
(H.P. Price £30.18.6)
ARMSTRONG 224 FM Tuner Powered
Cash £24.15.0
Or Dep. 1351- and 12 m. pymts. 33/7
(H.P. Price £26.18.0)
ARMSTRONG 223 AM/FM Tuner Powered
Cash £31.0.0
Or Dep. 155/- and 12 m. pymts. 42/8
(H.P. Price £33.7.0)
ARMSTRONG 127 Mono 5W with AM/FM
Cash £29.10.0
Or Dep. 147/6 and 12 m. pymts. 40/7
(H.P. Price 631.14.6)
ARMSTRONG 127 Stereo as above Stereo amp.
Cash £39.10.0
Or Dep. 197/6 and 12 m. pymts. 54/4
(H.P. Price £42.9.6)
ARMSTRONG 227 Mono 10 watt with AM/FM
Cash £39.10.0
Or Dep. 197/6 and 12 m. pymts. 54/4
(H.P. Price £42.9.6)
Teak Cases for all Armstrong Units
£3.10.11
TERMS: G.W.O. or C.O.D.
ALL ITEMS CARRIAGE FREE
Leaflets available upon receipt of 6d. stamp
48-50
Surbiton Road, Kingston -on -Thames,
Phone KIN.
Hours 9 a.m. to 6 p.m. daily
5549
(1
Surrey
p.m. Weds.)
RADIO VALVE DATA
2
Pat. App. For
£2
"zwa
POST FREE
On your own
*
*
**
TRANSISTOR PORTABLE!
Boosts Pirate and distant stations.
Just
No Plugs-No Connections
1
place
Dewtron Wave Trap near radio.
reduces 'fading'.
Extends Battery life
Use in car, caravan, without aerial.
With PP3 battery (life several months).
D.E.W. LTD., Dept. P.W., Ringwood Road,
-
METRES
4
The thrills of VHF Amateur Radio! Complete Kit, 70-150 Mc/s, costs only 42/6 (by
post, UK, 3/3 extra) also now available new
transistor Short -Wave kit model TR2 10180 metres, ideal for beginners to Ham radio
via simplified Easy-Build" step-by-step
instructions from 79/6. Write today enclosing a stamped addressed envelope for literature and full details. Overseas enthusiasts
note we despatch to all parts of the worldlocal stamp OK for literature. "GLOBE KING" (Regd.) precision standard products
tried and trusted by Amateurs everywhere.
JOHNSONS (Radio)
NEW 6th ED. BY WIRELESS WORLD 9/6 P&P 1/ -
Amateur Radio Call Book, 1967 edition by
R.S.G.B. 6/-. P. & P. 8d.
ABC's of Silicon Controlled Rectifiers by
Lytel. 16/-. P. & P. 1/,
Transistor Pocket Book by Hibberd. 25/-.
P.
&
P.
113.
Multi Channel Radio Control by Warring.
12/6. P. & P. 1/-.
Circuits for Audio and Tape Recording by
Judd. 7/6. P. & P. 9d.
Principles of Transistor Circuits by Amos.
25/-. P. & P. 1/3.
Electronic Pocket Book by Hawker. 21/-. P. & P.
1/3.
Loudspeakers by Briggs. 25/-. P. & P. 1/3.
Where possible
24 -hour
service guaranteed.
UNIVERSAL BOOK CO.
St. Martins Gate, Worcester
12
LITTLE NEWPORT STREET,
LONDON, W.C.2
(Leicester Square Tube Station)
FERNDOWN, Dorset.
air
..N1,.1W..111, .11\,.1\1,.1\1..111,.N1..1\I,.HL.111..1\h.N1,.111,.N1,.111. NH..111,.111,.H1,NII,.N..1\..1N,.IN,N11.1111111.1111.111.N11,.11}..\11.1N.111}..N.a\\1,11\1.1N1,.1p,.111,
SOLDERING?-.
Made by ANTEX-makers of the finest precision
soldering irons in the world, this Soldering Kit
contains everything you need for successful soldering. Unique plastic "tool -box" format (with
space for iron stowage with plug) keeps everything where you want it.
ANTEX LTD. GROSVENOR HOUSE, CROYDON, SURREY. MUNicipal 2774;5
--111,.111,.111..111,1111,.111,..111..111,1\11,.111,.111,1111.11.
618
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..11...1..11. ..11...1\1,.111.1111,.11..11...11.,.11.,111
VALVES!
NEW
Guaranteed Set Tested
PADGETTS RADIO STORE
1E5
4/-
185
1T4
394
3V4
2/9
319
413
DK32
DE91
71-
DK96
DL33
613
4/6/6
E085
EF86
EF89
EL33
PY33
819
PY80
419
PY81
5/PY82
419
PY83
5/3
PY800 5/11
1019
6/6
5/616
419
813
DL35
4/9 EL41
8/DL92
4/3 ELM
4/3
DL94
5/- EY51 5/11
813
DL96 5111 EY86
5/3 U25
816
6/3 EZ40
516 1126
DY86
6/9 EZ80
3/6 11191 10/713 DY87
6L18
4/- 13301 11/6
3/- EABC80 5/6 EZ81
6V6G
6/3 11801 15/6
111- EAF42 7/- KT61
1002
1416 UABC80 5/9/6 EBC41 6/6 0078
1001
10013 813 EBF80 5/9 P0084 513 UAF42 6111
201'2
8/9 EBF89 5/9 PC089 919 UBC41 616
20L1 13/9 ECC81 313 PCF80 613 118080 5/6
8/9 ECC82 418 PCF82 5/9 UBF89 5/9
2001
819
ECC83 416 PCF805 81- 110085 6120P3
2004 12/6 ECC85 513 PC1,82 6/3 U01142 8/9
7/- ECH35 5/9 POLOS 819 1TCH81 6/30E5
2004 1116 ECH42 8/6 PCL84 713 UC1.82 7130019 11/6 1'00081 5/6 PCL85 7/9 UCL83 816
7/9
9/3 ÚF41
DAC32 619 ECL80 5/9 PL36
516
616 U089
DAF91 3/9 ECL82 6/3 PL81
719
5/- ÚL41
DAF96 5/11 ECL86 7/8 PL82
513
3/6 PL83 5/11 11L84
DF33
7/6 8039
4/9
61- UY41
219 EF41
5/9 PL84
DF91
419
413
PY32
819 UY85
DF96 5111 EF80
Postage on 1 valve 9d. extra. On 2 va yes or more,
postage 6d. per valve extra. Any parcel insured against
damage in transit 6d. extra. Office address, no callers.
5/-
STINT 4/6
601
6117G
6008G
613
113
313
OLD TOWN HALL,
LIVERSEDGE, YORKS.
/
24 -HOUR SERVICE
Telephone: Cleckheaton 2866
Reclaimed Tubes. Six months' guarantee.
AW43180, 30/-. MW43180, 30/, MW43169, 301-.
CRM172, 30/, CRM142, 17/, 12" Tubes, 10/-.
17" tubes perfect but without guarantee, 17/ -
each. Carriage on any tube in G.B., 10/-.
Specially Selected Nearly New Valves with
months' guarantee. Single valves. Post 7d.
PY33
6/ARP12 1/8
5U49
PCC84
ECL80 3/6
6K7
5/6
119
PCF80
ECC83
6K8
5/6
5/21PL36
6/ECC82
6V6
4/3
11
PL81
EF91
2/185BT
5/6
8/6
807
EL38
5/5/-
6
The ?Meeou
HOLE PUNCHES
Instant Type
f" diameter..
..
Screw -up Type
4f" diameter Toggle switch
6/10
VALVE LIST
Ex. Equipment,
EF80
ECL80
EF91
EB91
EBF80
8/6
8/6
18/10
83 OSBALDESTON ROAD
B9G ..
1;"
STOKE NEWINGTON
LONDON N.16
21/8
24/4
33/2
Meter..
Complete Set £9.3.6.
No extra charge for postage and packing
in the U.K.
Now supplied by
Two Way Radios, 3transis., £6.10.0. 10, transis., £21.
13 transis., 1 watt, £80. These cannot be operated
in the U.K. Crystal Set Kits, all parts and case, 14/11.
Microphones, Xtal., Hand, 10/6. Stick, 200.C, 37/6.
BM.3 and base, 45/-. Lapel, 7/-. Dynamic dual,
imp., DM18HL, £5.19.0. DM17, £5.15.0. DM16,
don't miss
FM.
Tuner, Transistorised,
£6.
Christmas offer only whilst stocks last, £7.10.0.
Electric Carving sets, ideal present, 30/6. Electric Back
Scratcher, Have Fun, 9/6. Car Aerial, 5 sect. lockable
wing mtd., 35/-. Tape Splicers, T635 and similar, 13/6.
Headphones, Hi -imp., SF.20, 12/6. Earpieces, 3/6.
Mike Mixers, 4 channel, type MM -4, 49/-. Jack Plugs,
Std., 2/6. Screened, 3/3. Min. 3.5 PJM-3, plug and skt.,
1/10. Phono, 8/6, pkt. 10. Key Ring Torches, mercury
cell, 4/6. Handbag Torches, 3" x 1;°, 1/6, no battery.
Battery Charger, with meter, 6-12V., 47/6. Screwdriver
Sets, 3 piece, 1/3.5 piece, 2/6. Speaker Grills, 61" x30",
plastic, cream, 1/6. Metal finish, silver or gold, 2/6.
Panel mtd. neon indicators, 3/-.
TOMPKINS &
llr..Il/ // /II
or
/r
11
0, I/I I/
PCL82
PCL83
PCL84
PCL85
PZ30
PY81
PY82
PL81
PL36
PY33
6014
51-
10C2
10P13
10P14
20D1
20L1
20P1
5/2/6
5/-
.
Please mention
"Practical Wireless"
when replying to
Advertisements
PLANET INSTRUMENT CO.
42 RUSHLEY ROAD, DORE, SHEFFIELD
11
PC84
machines. Carriage 8/6.
Special Offer. Garrard Record Players.
Auto Changers. Model AT6, £8.2.6. Model 1000,
£5.12.0.
Single Player. Model SP25, £8.2.6.
Carriage and insurance on any model, 101-. All
complete with cartridge and maker's guarantee.
Breaking up 19 Sets. Receiver section complete with valves. Parts removed, 500 micro amp meter. All transmitter parts, Relay and
807 valve. Condition Fair, no dry rot, 10/-.
Carriage 10/-.
Multiplying/Dividing Computer
Simultaneous Equation Solver
Quadratic Equation Solver .
The above analogue computer circuits all
based on the Wheatstone Bridge, are not
expensive to build and all parts are available.
Circuits, wiring diagrams, instructions, price
lists, 4/6 post free.
Multimeters at new reduced prices. TK20A,
33)- post 2/-; EP1OK, 67/6 post 2/-; EP2OK,
85/- post 2/-; EP3OK, 105/- post 2/9; EP5OK,
145/- post 2/9; EP100K, 165/- post 2/9.
Further details on request.
1 % High Stab Resistors, 3W, 2/-. Stock list on
request.
CHARLES MARSHALL
5/2/2/4/-
PCF80
Post Paid.
Motors, Single Phase. 240v., quarter H.P.
26/-. 1400 revs. Fully guaranteed, ex washing
NEW CIRCUITS
Football Pool Computer
accessories send 6d. stamp for catalogue,
terms, C.W.O. 1/- p.p. under 10/-.
/1 ,
LTD.
237 GIPSY ROAD
WEST NORWOOD, S.E.27
Tel. Gipsy Hill 5000
Many other
11
LONGMAN
months' guarantee.
KT36
9d.
90.
3/3/3/4/5/2/6
ECC81
ECC82
ECC83
9/6
10/2
10/8
11/8
13/4
16/2
tá"diameter Int. Octal
GERALD BERNARD
1/6
1/6
213/3/5/4/3/2004
5/8/6
EL84
15801
8/6
1/6
EY51
U329
511/6
EF50
1/U301
4/5/EY86
U191
5/5/5/6K25
U281
5/5/5/614
6138
U282
5/1/6
5/6P25
6F1
U25
5l5/1/Special Offer. Bush TV5617" 13 -channel TV Sets
in good working order fitted with good tube.
Cabinet condition fair. £8. Carriage 101-.
Untested 17" TV Sets, complete fitted with all
BBC and ITV coils 50/-. Carriage 101,
Top Grade Diodes 3/- Per Doz. Post Paid.
Bush TV53 14ín. 13 channel TV set perfect working order £6.0.0 carriage 10/-. N.Z. £4.0.0.
Perfect Speakers removed from TV sets.
Rola 6 x 4, 3/-. Goodman 7 x 4, 5/-. 6" Round, 3/-.
Philips 5" Round. 3/-. Plus Post on any Speaker
2/9. 6 x 4, 6" and 5" Round Speakers, 6 for 20/-.
B7G
B8A, B9A
3
Single Valves Post 7d.
ea
25 (W) Dominion Avenue, Leeds 7
I/
I/I
lr
I
Il/ II , tl
Il
I
1/1
.I/
//
.hr ..II
11
.Il
.I
//
.I
.1/
..1/
I/
10
,.Il
Il
:Il
Il
iikutitemaimetx PRECISION SOLDERING KIT
This is what the ANTEX Kit contains:
Model CN240 15W Precision Iron with 3116" bit, (used
in electronic workshops and factories all over the world)
Two spare Interchangeable Bits (5/32" and 3/32")
Reel of resin -cored Solder
Cleaning Pad
Handy Heat Sink
Obtainable from
radio and electrical
shops everywhere.
booklet on "How -to -Solder" -a mine
of information for amateur and professional.
36 -page
19i SVI llJi2Irli 1/,.
BRING YOUR WORKSHOP UP-TODATE with the new ANTEX KIT
0..
49'6
ANTEX LTD. GROSVENOR HOUSE,
CROYDON, SURREY. MUNicipal 2774/5
/1...11/..
/I.. /1. /II..I/..//I.. 111.I/l,.t/Ia,1/IIr11,1/I..1/Ir.1II..IIIIt1111tI11i I/I. 111:
619
NEW RANGE U.H.F. AERIALS FOR
(625) line transmissions
BBC 2
fitted with tilting
bracket and 4 element grid reflectors.
Loft Mounting Arrays, 7 element, 35/-.
All U.H.F. aerials now
element. 42/6. 14 element, 50/-. 18
element, 57/6. Wall Mounting with
Cranked Arm, 7 element, 60/-. 11 element,
67/-. 14 element. 75/-. 18 element, 82/6.
Mast Mouating with 2fn. clamp. 7 element,
42/6; 11 element, 55/-; 14 element, 62/-; 18
element, 701-. Chimney.Mounting Arrays,
Complete, 7 element, 7276; 11 element, 80/-;
14 element. 87/6; 18 element, 95/-- Complete
assembly 4.nstructions with every unit.
Low Loss Cable, 1/6 yo. U.H.F, Preamps,
from 75/-. State clearly channel number
required on all orders.
11
HI-FI CONTINENTAL
STEREOPHONIC RADIOGRAM CHASSIS
ITV F.M. AERIALS
BBC
BBC (Band I). Telescopic
loft, 21/-. External SID,
30/-. "H" £2.10.0
Magnificent 'Continental' Stereophonic Radiogram Chassis with piano key switches, builtin ferrite rod aerial. Comes complete with two
10" elliptical loudspeakers, plus a mono/stereo
4 -speed automatic record changer. Complete
£29.19.6. (Units available separately if required.
Chassis only 19; gns.).
Special terms available of £10.0.0 deposit
ITV (Band 3). 3 Element
loft array, 25/-. 5 element
35/-. Wall mounting, 3
element, 35/-. 5 element,
ELECTRONICS
(Dept. P.W.)
Surrey
LOD 2266
.
SUPPLIERS OF
ELECTRONIC
EQUIPMENT
4!Z1
TO
...
* UNIVERSITIES
* COLLEGES OF TECHNOLOGY
* COLLEGES OF FURTHER
SUPPLIERS TO MANY
EDUCATION AUTHORITIES
Usual Educational Discounts
OUR NEW 1966/67
illustrated catalogue
NOW AVAILABLE
(send 11- in stamps
for your copy)
only 258 gns. Special terms available of £12
deposit followed by 18 monthly payments of
£1.11.7. (total H.P. £40.8.6)+15/- P. & P.
Send £12.15.0 now.
All Lewis Radio equipment including valves
art fully guaranteed for one year free of charge.
Send your cheque or P.O. today while stocks
last to Dept. P.126.
OMB radio''
/lVCL UDES
Transistors, Transformers,
Loudspeakers, Recording Tape, Coils, Resistor,
Condensers, Potentiometers, Chassis, RectiMicrophones, Tools,
fiers, Test meters,
Solder etc.
Valves,
ALPHA RADIO SUPPLY CO
103 Leeds Terrace,
LEWIS RADIO, IOO,CHASE SIDE, SOUTHGATE
LONDON, N.14 Telephone; PAL 3733/9666
620
for stereo,
£10.19.6
£11.12.6
3000
Auto -Changer, less cartridge
£8.12.0
2000
Auto wired for stereo including cartridge
£7.15.0
1000
Auto wired for stereo including cartridge
EV.26 shell cartridge, sapphire stylus
OFFICIAL
most advanced radiogram chassis with
automatic push button selection covers short,
medium and long wavebands plus V.H.F./F.M.
Offered complete with 2 10 x 6 speakers 4 speed
Stereo/Mono autochanger only -235.19.6. Chassis
wired
CARTRIDGES
EDUCATION h SCHOOLS
* ALL RADIO ENTHUSIASTS
This
£26.0.0
£7.5.0
The Imperial Stereophonic 4 waveband chassis
has the most advanced specifications yet offered
In this country. There is a built-in ferrite rod aerial,
seven piano key buttons, controlling mono/stereo
selection.GramLong-Medium-Short-FM-ON/OFF.
The unit comes complete with two 10" elliptical
loudspeakers plus a mono/stereo 4 speed automatic record changer. Complete £41.9.6.
Chassis only 298 gns.
;ÁM/FM STEREOPHONICC`IIASSIe
cartridge
less
Auto -Changer, heavy cast turn -table
less cartridge
27 Central Parade, New Addington
..
Player,
VHF transistor pre -amps.
Quotations for special arrays available
on request
EMPRESSe1I
Transcription
AT.60
F.M. (Band 2). Loft S/D. 12/6, "H", 301-, 3
element, 52/6. External units available.
Co-ax cable, 8d. yd. Co -ax plugs, 1/3. Outlet
boxes, 4/6. Duplexer Crossover Boxes, 12/6.
C.W.O. or C.O.D. P. & P.4/6. Send 6d. stamps
for illustrated lists.
Special terms available of £13.16.6 deposit
followed by 24 monthly payments of £1.8.10
(total H.P. £48.8.6)+17/6 P. & P. Send £14.14.0
now.
GARRARD TURNTABLES
LAB.80
63/9; Chimney 1+3, 63/9;
1+5, 71/3.
K.V.A.
GUARANTEED
SOUND
BARGAINS
S P.25
Non -Auto Player,
less cartidge
751-.
/':IMPERIAL HI-FI '
STEREOPHONIC RADIOGRAM CHASSIS
39 Barrack Rd. Northampton
45/-.
Combined BBC/ITV. Loft
1+3, 41/3; 1+5, 48/9; Wall
mounting 1+3, 56/3; 1+5,
followed by 18 monthly payments of £1.6.5
(total H.P. of £33.15.6)+15/- P. & P. Send
£10.15.0 now.
DANE
Electronics
Wintoun Street, Leeds 7
Telephone 25187
21/6
Sonotone 9TA HC Stereo
ACOS G P.83 Stereo
ACOS GP.67/1 with shell mono
ACOS GP.91/1 less shell mono
GARRARD GC.8 with shell mono
GARRARD GC.2 with shell mono
RONETTE DC.284P with shell
and diamond stylus
25/6
12/6
12/6
17/14/17/23/6
SPECIAL
AMERICAN VERITONE P.V.C.
TAPE-PROFESSIONAL QUALITY
SP.7
1200 ft.
13/6 7" reels
LP.7
1800 ft.
19/6
LP.5
900 ft.
11/6 5" reels
DT.5
1200 ft.
16/53," reels LP.6 1200 ft.
14/ -
CAR RADIOS
"Royal" Push Button
2 waves transistorised complete with speaker and
fitting kit
£14.15.0
"Burleigh" 2 wave transistorised complete with speaker and fitting kit £11.7.6
AMPLIFIERS
15 watt Stereo Amplifier
10 watt Stereo Amplifier
8
watt Stereo Amplifier
-Minette
"
2 valve Gram
£31.15.0
8.0.0
1
£11.1 9.0
Amplifier £4.5.0
All above prices including
post and packing
DANE ELECTRONICS
39 Barrack Rd.
Northampton
LAFAYETTE HA -63 COMMUNICATION RECEIVER
TEST EQUIPMENT
Outstanding value. High-class 4 band receiver
covering 550kc/x-31. Mc/s. Seven valves plus
rectifier, RF stage, illuminated "S" meter,
1.51AV sensitivity. Electrical bandspread on
80/40120/15 and 10 metre bands. Slide rule
dial, aerial trimmer. B.F.O., ANL, Output for
phones or speaker. 115/220/240V. A.C. Brand
new, guaranteed, with manual. 24 Gas. Carr. 10/-
PORTABLE OSCILLOSCOPE CT -52
a 16451.) general purpose 'scope
T/B lOefe'40 kc/s. Band width 1 Mies. Mollard DG 7/5
21ín. CRT. For operation on 200/250v. A.C. Supplied
complete with metal transit case, strap, test leads, and
visor hood. Brand new, £22,10.0. Carr. 10/-. Supplied
complete with instructions.
A compact (9in. x Bin.
OS/8B/U OSCILLOSCOPES
108-136
TE -900
Me/s. High selectivity and
sensitivity. Incorporates 2 RF stages
including 6CW4 Nuvistor 8 tubes for
11 tube performance, solid state power
supply, adjustable squelch control, slide
rule dial, built-in 4ín. speaker and front
panel phone jack. 220/240V. A.C.
Supplied brand new and guaranteed
£19.7.6. Carr. 10/-. 1.08_1.76 Mc/s Ground Plane Antenna 59/6
20,00012/
-®__
g"
VOLT GIANT MILTIMETER fiin. full
view meter. 2 col-
our scale. 012.5/10/
250/1,000/5,000 V.
A.C. 1/25/12.5/10/
50/250/1,000/5,000
V. DC. 0/50µA/110/
100/500 mA/10 amp
D.C. 02K/200K/20
MEG. OHM.
£12/19/6. P. & P. 5/-
J
Accurate wide range signal
generator covering 120 kc/s260Mc/s on 6 bands. Directly
calibrated. Variable R.F.
attenuator. Operation 200/
240v. A.C. Brand new with
instructions. £12,10,0, P. &
protection. 20,000
o.p.v. 0/:1/.5/5/50/250/
1000V D.C. 0/2.5/10/
50/250/1000 V D.C.
0/.05/.5/5/50/250 mA.
0/5K/50K/500K/5 meg
ohm. .0001- .2 mfd
+ 22 dn.
25.19.6. P. & P. 3/-.
g`7
i
P. 7/6.
S.A.E. for details.
-20-
1
LAFAYETTE
-TE-46
RESISTANCE CAPACITY ANALYSER
2 PF -2,000 MFD, 2 ohms
200 Megohms. Also checks
impedance,
buns
ratio
'
advertised.
LAFAYETTE
2 -WAY RADIOS
Super quality. Brand new
and guaranteed.
3 transistor £7.10.0 pr.
6
10
transistor £17.10.0 pr.
transistor with range
boost 222.10.0 pr.
Post extra.
These cannot be operated in
U.%.
TRANSISTORISED
TWO-WAY
TELEPHONE
INTERCOM.
Operative over amazingly
long distances. Separate
call and press to talk
buttons,
2 -wire
connec-
tion. 1000's of applications. Beautifully finished
in ebony. Supplied complete with batteries and
wall brackets.
£6.10.0 pair. P.
&
P. 3/6.
ZQM TRANSISTOR CHECKER
It has the fullest capacity
B
and
forchecking
on A,
leo.
Equally adaptable for checking diodes,
Spec.:
A:
2002-1
complete
insulation 200-250 v. A.0
Brand New £15. Carr. 7/6.
MEG.
with
instructions,
&
P. 2/6.
P.C.R.1. RECEIVERS
Brand New Condition -Fully Tested and
Checked before despatch. 3 Waveband
with RF
Stage-Wonderful value.
860-2080 metres 190-570 metres 5.6-18
Mc/s. with internal speaker £8.19.6.
Carr. 10/6 with circuit. Plug in external
power units. 230V A.C. 35/-, or 12V D.C.
19/6.
4 bands.
Square: 20 cps to
30 kc/s. Output
impedance 5,000
ohms. 200/250v
A.C.
operation.
Supplied Brand
New and Guaranteed
withinstruction manual
and leads. £15
1-0-1mA
1mA
58/6
50µA ...
100µA ...
200µA ...
500µA
50-0-o0µÄ
.
000v. PIV, 200mA
200v. PIV, 6 amp
400v. PIV, 3 amp (SCR)
400v. PIV, 3 amp
1,000v. PIV, 650mA
800v. PIV, 500mA
800v. PIV, 5 amp
400v. PIV, 500mA
70v. PIV, 1 amp
150v. PIV, 165mA
110v. PIV, 25 amp
700v. PIV, 100 amp
2/6
5/6
17/6
6/6
5/6
7/6
3/6
3/6
1/19/9
49/6
Post extra
Discounts for quantities.
\\\\\` \`,, f
..
22
6
22 6
22 6
5mA
22 6
10mA
22 6
32/6 20mA ,
22 6
29/6 50mA
22 6
27/6 100mA
22/6
22/- 150mA
22 6
29/6
POST EXTRA.
2m -A
20/.
25/-
,,,,
610.10.0.
Transistorised resistance capacity bridge 1 t1.
100 Mega. 1pF-100µF. £9.0.0,
Transistorised Induction bridge, 1µN-100H.
£18. Mains operated Transistor power supply
unit, output 1-15v. up to 100mA. £6.10.0.
All above post paid with battery.
CLEAR PLASTIC PANEL METERS
15/-
Amp
24.10.0
2.5 Amp
25.17.6
5 Amp
£9.0.0
8 Amp
213.10.0
10 Amp
217.0.0
12 Amp
219.10.0
20 Amp ,
232.10.0
2.5 Amp Portable
Metal Case with Meter,
Fuses, etc. 29.17.6.
350 Mc/s.
First grade quality, Moving Coil panel meters, available
ex -stock. SA.E. for illustrated leaflet.
Discounts for
quantity. Available as follows: Type MR, 38P, 1 21/32ín.
square fronts.
100-0-100µA 27 6 200mA ,,,, 22/6 100V D.C..... 22/6
500-0.500µA 22 6 300mA .... 22/6 150V D.C..... 22/6
VARIABLE VOLTAGE
TRANSFORMERS
1
NOMBREX EQUIPMENT
Transistorised Audio Generator 10-100,000
c/s. Sine or square wave. £16.15,0.
Transistorised Signal Generator 150 ke/s.
Carr. 7/6.
1216
SILICON RECTIFIERS
battery and leads. 26.19.6. P.
WAVE
AUDIO GENERATORS
AMERICAN TAPE
Brand New -fully Shrouded. Input 230v.
50/60 c/s. Output 0-260
Vohs.
Compact, true one hand operation.
Frequency range 1.7 - 180 Mc/s.
230v. A.C. operation.
Supplied
complete with all coils and instructions. 212.10.0. Can. 5/-,
Sine: 20 cps to 200 kc/s. on
First grade quality American tapes.
Brand new. Discounts for quantities.
3in., 22500. L.P, acetate
4/34in., 600ft. T.P. mylar
10/-'
5in., 600ft. std. plastic
816
5in., 900ft. L.P. acetate
10/51n., 1,200ft. D.P. mylar
15/5in., 1,800ft. T.P. mylar
35/5/in., 1,200ft. L.P. acetate
12/6
5;fn., 1,800ft. D.P. mylar
22/6
5;ín., 2,400ft. T.P. mylar
45/7in., 1,200ft. std. mylar
7ín., 1,800ft. L.P. acetate
7in., 1,800ft. L.P. mylar
7ín., 2,400ft. D.P. mylar
7ín., 3,600ft. T.P. mylar
Postage 2/-. Over £3 post paid.
LAFAYETTE NUVISTOR
GRID DIP METER
TE22 SINE SQUARE
MAGNAVOX 363 TAPE DECKS
New 3 -speed tape deck, supersedes old
Collard studio deck.
2 -track 210.10.0.
4 -track 213.10.0. Carr. Paid.
-
etc.
0-7.0-9907, B:
5-200. 1co: 0-50
microamps, 0-5
mA. Resistance
for diode
Supplied
-
SINCLAIR TRANSISTOR AMPLIFIERS
512 Amplifier 89/6; PZ3 Power Pack 79/6; X10 Amplifier Built
£6.19.6. Kit 25.19.6; X10 Power Pack 541-; X20 Amplifier
Built 29.19.6. Kit 27.19.6; X20 Power Pack 24.19.6. Micro
FM Radio Kit 25.19.6. Micro 6, 59/6; Micro amp 25/6; Micro
Injection 27/6. Post paid.
CODAR
EQUIPMENT
£22.10.®
MODEL. 050D MOLTIMETER with meter
SRP12 Player mono 24.7.6; 1000 changer mono or stereo 25.19.6; 2000 changer mono or
stereo 26.6.0; A50 Changer mono or stereo 27.10,0. 3000 Changer stereo 27.19,6; ATO
Mk Ti 28.19.6; SP25 Player mono or etereo £9.19.6; AT60 Changer mono or stereo 29.19.6;
A70 less cartridge £21.10.0; LAB 80 Stereo 225.0.0; 401 Transcription 230.0.0. Brand
new and guaranteed. All plus poet and packing 5/..
All items available as
Time base 2 c/s -750 kc/s. Calibrators at
100 he/s and 1 Mc/s. Separate Y1 and 3/2
amplifiers up to 5.5 Mc/s. Operation
110/230 volt A.C. Supplied in perfect
working Order.
GL
Carriage 20/-.
TE -20 RF SIGNAL GENERATOR
GARRARD RECORD PLAYERS
MAIN LONDON
AGENTS FOR
ERSKINE TYPE 13 DOUBLE
BEAM OSCILLOSCOPE
quality
Portable
American Oscilloscope, 3in.
c.r.t. T/B 3c/s-50kc/s X
Amp: 0-500 he/s Y
Amp: 0.2 Mc/s. Power
equirements 105-125v.
A.C. Supplied in brand
new condition. Fully
tested. £25, Carr. 10/-.
Suitable 230-115 v.
Transformer, 15/6.
Higgs
LAFAYETTE HA -55A
AIRCRAFT RECEIVER
500mA
750mA
2A D.C.....
5A D.C.....
3V D.C.....
10V D.C.
20V D.C. ,.
50V D.C. ..
Larger sizes
,
NEW
20,000 SZ/VO LT
TE -51
/
6
/ 120
/ 60
/
/60 /300/
600/3,000V. D.C.
0 /60µA/12 /300
Meg.D
P. 2/6.
6
0/2.5 /10/25./100
input.
volt ranges.
1,500
ranges.
v. 7
7 D.C.
1.5A.C. volt
1.5.1,500
/
v.
Peak to Peak.
Resistance .2 ohm to
1,000 megohm. Decibels
10db to +65db.
Supplied brand new
and
212.10.0. P.
probe.
&
P. 3/6.
/50µA/5 / 50/
500mA.
D.C.
0 / 60K
-
instructions,
250 / 500 / 1,000v.
A.C.
0
4,000
with
leads
,
MODEL 500- 30,000
opv, 0/.5/1/2.5/10/25
/ 100 / 250 / 500 /
1,000 v. D.C.
MODEL PV -58 VALUE
VOLTMETER
11 meg.
,
Meg./60 Meg.tl. P.F.
-.0 MFD. 85.19.6.
P. & P. 3/6.
MA. D.C.
/
&
,
A.C.
0/60µA/6/60/
600 mA. 0/6K/600K/6
0/3/30
60K
85/-. P.
,
MODEL TE -12
1,200V. A.C.
0 /
22/6 700V D.C., , 22/6
22/6 500V D.C..... 22/6
22/8
22/6 15V A.C. .... 22/6
22/6 50V A.C. .... 22/6
22/6 150V A.C..... 2216
22/6 100V A.C., , , 22/8
22/6 500V A.C. .. 22/6
22/6 '0' Meter 1mA 29/6
available-send for lists.
20,000 O.P.V. 0r.0e/
6 /30 /120 /600 /1,300 /
3,000/6,000v. D.C. 0/
6/30/120/600/1,200 v.
MULTIMETER
0
....
....
lA D.C..... 22/6 750V D.C., ..
Meg G.
amp
12
/ 6 Meg. / 60
Post paid.
£8.17.6.
CALLERS WELCOME
I
a.m. to 6 p.m. every day Monday
to Saturday, Trade supplied.
Op n 9
i
(RADIO). LIMITED
,,:
JViii%/ l/I{i
1\\\
Phone: GERRARD 8204/9155
Cables: SMITHEX LESQUARE
3-34 LISLE STREET, LONDON, W.C.2
621
THE ELECTRONICS ff SCIENTIFIC CENTRE
Make )'our4biYñg
PAY
The very latest 3 speed model-14, 39, 75
i.p.s. available with either -, track or 9 track
head. Features include; Pause control;
digital counter; fast forward and rewind;
new 4 pole fully screened induction motor;
interlocking keys- Size of top plate 134 x11
x 54in. deep below unit plate. For 200/250
v. A.C. mains 50 ups. operation. New
unused and fully guaranteed.
track model
develop your talents and help you to success.
STUDY IS EASY with ICS guidance. The courses are
thorough. Printed manuals, fully illustrated, make study
simple and progress sure.
YOUR ROAD TO SUCCESS can start from here-today.
Complete this coupon and post it to us, for full particulars
of the course which interests you. MODERATE FEES
INCLUDE ALL BOOKS.
ADVERTISING & ART
Copywriting, Cartooning
Layout and Typography
Commercial Illustrating
Oil & Water Colour
BUILDING & CIVIL ENG'NG
Architecture, Bricklaying
Building Construction
Builders' Draughtsman
Builders' Quantities
Interior Decoration
Quantity Surveying
Heating & Ventilation
Carpentry
&
Joinery
COMMERCE
Book-keeping
Accountancy & Costing
Business Training
Office Training
Purchasing, Storekeeping
Secretaryship
Shorthand & Typing
Computer Programming
Small Business Owners
Park Gardening
Market Gardening
Arable & Livestock
Pig it Poultry Keeping
Farm Management & Accounts
automatically directed onto end of
bit when ON/OFF trigger is in use.
85 watt element with special ventilais
track model
£13.9.6
tion. Complete with 2 -pin, S amp. plug,
230.250 volts. Spares
49 / n +2/6
available.
P.P
of 50 -volt. 50-cycle
servos that enable remote indication of
angular position to
be made. These are
ideal for monitoring
Wind Directions in
the comfort of the home, or the position
an
of
aerial system for amateur broadcasting enthusiasts. The exact position
of a roulette wheel could be "guessed"
by a magician using our system.
It should be noted that 50 v. is readily
obtainable, by using the 200 -250 -volt tap
on any mains transformer.
Size of magslipmotor 31in. x lin.
Cost of pair. 751-, plus u'/- P. h P.
DRIVE
Public Relations (IPB)
Transport Management
Works Management
Work Study
Foremanship
MECHANICAL &ROTOR ENG'NG
Engineering Maths.
Diesel Engines, Welding
Industrial Instrumentation
Workshop Practice
Refrigeration
Motor Mechanics, etc.
'
interestitem with
numerous appliA very
ing
cations consisting
of an electromagnet and brass
tooth wheel. A
switch wafer and
contacts are coupled to this and are
arranged to be on for 10 pulses and off
for the next 15. An auxiliary contact is
normally on, but off for one in every
25 pulses; complete with suppressor
resistors and a series contact to facilitate
continuous
for window
models, 12
and Boxed.
Telecommunications
Electricians'
Electrical Contractors'
operation. Absolutely ideal
displays, switching lamps or
or 24 v. D.C. Brand New
12/8, inc. P. & P.
SINCLAIR
SUPER MINIATURES
Micro 6 miniature radio
Micro -FM (tuner/receiver)
PZ3 M.P.S. unit
Z-12 12 watt amp and pre
amp, fully built
STEREO 25 pre -amp control
unit, fully built
P. & P. 3/6 each.
SELLING
Company Reps.
Sales Management
WRITING FOR PROFIT
Television Scriptwriting
Short -story Writing
Free-lance Journalism
INTENSIVE COACHING for all principal examinations-G.C.E.,
Secretaryship, Accountancy, Engineering, Work Study, Management Radio, and Surveying. Special courses for G.C.E. French,
German Oral Tests.
£2 19
£4
8
9
6
£9 19
6
Geared for 40 revolutions per hour. 230 v.
50 cycles. With mounting flanges. 29/6.
P. & P. 1/6.
MODEL MAKER'S
Miniature D.C. Motor. Ideal for driving a
gear system or can be used as a Tachometer. Speed 10,900 r.p.os. at 230 mA.
6.3 v. D.C. Housed in black ebonite case
ltin.
s/64in.
to highest
Ministry specifica.
Made
tions, as used by
Airlines. High imp.
Complete with Eft.
cable. 75/-. P. & P.
2/6.
`SMITH'
1/10th
RECORDING
STOPWATCH
second
UNREPEATABLE
AT ONLY
77/6
Postage & packing 2/6.
Time those sporting
events, records, films,
etc., yourself with this
excellent ex -service timer, offered at rock
bottom bargain price. Pattern 3169, manufactured to stringent government specifications.
Jewelled movement, 1/10th
see. recorder, 0-15 min. register and
functions with three pressures (start,
stop and return) on crown. 14 Days;
Approval for cash. 12 Months' Guarantee.
FANTAVOX STEREO
AMPLIFIER
MODEL MG -333
The Stereo MG-333 is a compact and
handsomely designed dual channel
amplifier for use with stereo record players
and AM or PM tuners. The amplifier
operates from a power source of 105-125
for 200-940) volts, 50/60 eycle AC, and is
equipped with Individual volume controls
for each channel, a continuously variable
tone control, and a stereo -monophonic
mode switch. Price 18.19.6. P & P 6/6.
MULTIMETERS
1001 20,000 0 /volt£3 12 6 P.& P.3/6
B.141,000í3/èolt £2 2 0 P.& R3/6
NH 200 20,0000 /
volt
£6 0 0 P. & P.5/6
C
CABY B.40
10,0001)/volt £6
2
6
TMK.500
SYNCHRONOUS
CLOCK
MOTORS
size
COMPLETE
WITH BOOM
MICROPHONE
6
6
£5 19
£3 19
Member of the Association of British Correspondence Colleges
INTERNATIONAL CORRESPONDENCE SCHOOLS
(Dept. 172)
Intertext House, Parkgate Rd., London, S.W.tt
SUPER LIGHTWEIGHT
PILOT'S HEADSET
Auniqueofferofapair
SELECTOR
Marketing
&
etc. Unique features
include interchangeable tips, extension barrels, comfortable
grip with trigger control. "U" shaped
3-4in. bit to minimise wear, Light beam
50V.
SERVO
SYSTEM
RADIO, TV 0e ELECTRICAL
Servicing & Engineering
Radio Construction (with Kits)
P.M.G. Certificates
FARMING
HEAT SOLDER GUN
Ideal for model mahome repaira,
electronics, radio, TV,
kers,
Carriage and Packing 7/6 extra.
Business Management
Hotel Management
Industrial Management
Office Management
Personnel Management
Practical Photography
Industrial Electronics
1
£10.10.0
MANAGEMENT
PHOTOGRAPHY
Computers
Electronic Technicians
Advanced Level
Good English
Foreign Languages
HORTICULTURE
Home Gardening
Entrance Examination
Police Promotion
ELECTRONICS
GENERAL EDUCATION
G.C.E. subjects at Ordinary
.
POLICE
DRAUGHTSMANSHIP
Architectural, Mechanical
Drawing Office Practice
PROFESSIONAL
ELECTRIC INSTANT
LIND -AIR PRICE
UNLIMITED OPPORTUNITIES exist today for "getting
on" ... but only for the fully trained man. Let ICS's tuition
Take the right course now
t
MAGNAVOX-COLLARO
363 TAPE DECKS
x lin. dia. Spindle lin. long x
dia. 9/6. P. & P. 2/6.
P.
P.6/-
30,0000 /volt £9 19 6 P. &P.6/6
New AVG Meters from stock.
MINILAB
71 Tester
£6 19
6
P. &P.6/6
TRANSISTORS
%A101
%A102
%A104
GETS
GET103
GET104
0016
0023
0045
OCK
1/6 00170
1/6 00171
1/6 11A393
2/4/4/10/10/1/9
OC81D
6/-
6/-
7/6 BC107
9/8/6 ACY21 6/3/- AC107 14/6
If- AF115 8/6
0B344
V15/20P 8/- AF117 7/6
V60/201P8/- ACY20 5/MAT100 7/9 26014 44/6
MAT120 7/9 2S017 25/MAT101 8/6 29018 MMAT121 8/6
(Postage and Packing 1/-)
7C81Z1\T7E/-A=R.
Send FREE book on
Mlectro=z3.4es
Name
Ltd.-
Address
Occupation
12.66
DEPT.
Lim
53 TOTTENHAM COURT ROAD, LONDON W.i.
LANgham 3653
-
INTERNATIONAL CORRESPONDENCE SCHOOLS
622
MANY
MORE
INTERESTING
BARGAINS
AVAILABLE
AT
THE
SHOP
10 AND 20 WATT MONO AND STEREO TRANSISTOR AMPLIFIERS
(9) POWER AMPLIFIERS. 10 watts
(10) PREAMPLIFIERS. 8 input selector.
RMS output. 100mV input. 30 c/s to 20k/cs
Treble, bass, volume, filter controls.
+ 1dB. 6 -Transistor Push-pull. Panel
1/mV to 300mV inputs. Battery operated
x 2; x 1 in. H/S 4 x 4in.
TPA10/3 3-5 ohm spkr. £4.10.0, pp. 2/6.
TPA70/1512-16 ohm spkr.,
size 4
or from Mains Unit. Output up to 150mV
RMS.
MP2 Mono 0/ x 2/ x 2in. £5.10.0, p.p. 2/6
(grey and gold front panel 8/6).
5P4 Mono/Stereo, 9 x 3/ x 1/in £10.19,6,
£5.5.0, p.p. 2/6
or 2 amplifiers, 59/6,
p.p. 2/6)
(Mains unit for
1
p.p. 3/6 (front panel plate 12/6).
The Finest High Fidelity at
ALL UNITS BUILT AND TESTED
Unbeatable Prices
(12)
25
WATT AMPLIFIER
8-Transistor
design. Push-pull
output
(10) above.
BAS
PRICE BUILT
£7.19.6
AND TESTED
!
R--`=VÓLü
(13)
PT34
MULTI -METERS SCOPE
metal work Superhet design, 88-108 Mc/s,
9 volt operated.
Total cost to assemble £12.17.6, p.p. 2/6.
1kV 39/6 EP3Ok 30kV £6.10.0
2kV 75/- EP5Ok 50kV £8.15.0
TP10
30kV £8.17.6
ITI-2 20kV 69/6 500
TP5S 20kV £5.19.6EP100k 100kV £10.10.0
C752 Scopes Brand New 822.10. P.p. 10/
Complete range of test equipment in stock
(15)
fi
(9)
GARRARD BATTERY
TAPE DECK
9
PRICE
303 EDGWARE RD.,
LONDON,W.2
PADdington 1008/9 (STD: 01-723-1008)
Thurs. 1 p.m.
Open Mon to Sat. 9-6.
Open all day Saturday.
SEE BACK COVER
10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/10/-
FOR
10/- FREE!
COMPONENTS
EQUIPMENT. The
6-
largest
MORE ITEMS OF INTEREST
10/- FREE!
ANY ELEVEN ITEMS FOR £51-/-!
10/- FREE!
10/- FREE!
Rush your order now! These prices cannot be repeated!
G. F. MILWARD
17 Pee! Close, Drayton Bassett, Nr.
Audio Generator.
5
POST ONLY
Ato1PLt
-
cm
Push-pull, 3 ohms, 6mV into
x 2 x 1.'4,in.
69Uc
VALVES
SETS
1A7GT
1H5GT
1NSGT
P,P.
1R5
184
185
1T4
12AX7 419
12K7GT 3/6
4/9 12KSGT 8/6
516 12Q7GT 3/6
4/6 20E2
5174G
9I 14/5Y3GT 4/11 20L1
6/9 20P1
9/SZ4G
9/6/30L2 9/6 201'3
13/6
6AL5
2/3 20P4
3/6 25U4GT11/6
6AM6
4/9 30C15 10/6AQ5
4/- 30018 8/6AT6
633146
4/6 30E5
7/3
6BE6
4/3 30FL1 10/6
6BJ6
5/6 30015 11/6BW6
7/3 30L17 12/6F1
7/9 30P4 13/6
9/6E13
8/6 30P12
6F14
9/- 30P19 13/6
61'23
9/9 30PL1 11/3A5
3Q4
384
3V4
7/-
5/6
1/6 30PL1311/9
6/3
6K7G
6K8G 4/3 35L6GT
6K8GT 7/6 35W4
6L18
7/6 35Z4GT
6Q7G
5/6 85A2
4/6
4/6
5/9
6Q7GT 7/6 185BT 20/12/6
6V6G
3/6 6063
8/9
6V6GT 5/6 AZ31
6X4
4/6
3/6 B36
6X5GT 6/3 B729
10/7B6
7B7
705
7C6
7H7
7Y4
10/6
7/9
8/9
6/9
(13)
Vp.
(15)
SAME DAY SERVICE
NEW! TESTED! GUARANTEED!
1R5, 185, 1T4, 384, 3V4, DAF91, DF91, DK91, DL92, DL94.
Set of 4 for 16/-. DAF96, DF96, DK96, DL96, 4 for 24/6
SI- PEN36C15/EF89
EF91
3/6 PEN383 9/6
213 Pb'L20014/6
4/- EF92
12/6 EF97
7/6 PL36
9/6
6/9 PL81
8/9
7/9 EF183
4/9 EF184 6/9 PL82
5/6
PL83
EL33
6/6
6/8/D1196
6/6 EL38 1119 PL84
6/3
86 PL500 14/DL33
6/9 EL41
DL35
7/9 PL801 7/6
5/- EL42
DL92
4/9 PX25
4/9 EL84
7/9
DL94
4/9 PY31
516 EL90
6/8
DL96
6/- EL95
5/- PY32
9/DY86
5/9 PY33
6/9 52480
9/DY87
7/3 PY80
6/9 EM81
5/3
EM84
PY81
EABC80 6/5/9
5/3
EAF42 7/6 EM87
6/6 PY82
5/EB41
4/- EY51
6/3 PY83
5/9
E1391
213 EY86
8/- PY800 6/6
EBC33 6/- EZ40
6/3 PY801 6/6
EBC41 7/9 EZ41
6/6 5119
7/6
EBF80 6/- EZ80
3/9 R20
12/9
4/- T1121C 9/8
EBF89 5/9 EZ81
ECC81 3/9 KT61
6/6 1725
9/ECC82 4/9 KT63
4/- U26
8/9
E0083 7/- N18
5/6 1747
8/6
50084 6/3 N78
14/9 0749
9/6
ECM 5/6 PC97 6/9 1752
4/6
ECF80 7/6 P0084 5/6 1178
3/6
7/6 9BW6
6/6 DF96
7/3 10C2
11/6 D1176
7/9 10F1
9/9 DH77
419 1oP13
8/6 DH81
4/9 12AT7 3/9 DK32
3/9 12AU6 419 DK91
2/9 12AU7 4/9 DK92
DAC32
DAF91
DAF96
DCC90
5/- DF33
5/- DF91
85
Tamworth, Staffs.
WATT
f8
count vouchers.
10/- FREE!
kc/s -350 me/s RF Generator
£10.10.0. All Transistor.
c/s -100 kc/s Transistor, £16.19.6
BUILT AND TESTED
range in the country. 6/- buys
150-page catalogue with dis-
BARGAIN SALE! 10/-
Phone: TAMWORTH 2321
3s.
(17)
2/(optional mains units 54/-)
1=, watt version 59/6.
Matching Preamplifier, 6 inputs, treble/
bass/selector/volume controls. 6-10mV
o/put. 9-18V supply. 79/6, P.p. 2/-.
For use with any Transistor Amplifier
(18) FMT41 FM TUNER. 6 -transistor, 3
diode design. Completely
10
built and tested.
(19) AMT81. _lied. Wave Tuner. Built
ready to use, 78/6 p.p. 2/-
AND
PISTOL -GRIP SOLDERING IRON (USUALLY 25/-)
20 well assorted TRANSISTOR ELECTROLYTICS
3 Television Smoothing Condensers, 200/200uf., 200/100uf.,
300/125/50uf., 275 volt
50 assorted ç watt 5% Resistors (Long leads)
100 '/ to z watt mixed resistor types, values
100 z to 3 watt Close Tolerance types
100 Silver Mica/Ceramic/Polystyrene Condensers
50 assorted paper condensers 001 to 5uf
100 miniature paper condensers (Mixed values)
50 untested TRANSISTORS (excellent value)
6 NPN or PNP Switching Transistors. (min. 200 m/cs)
10 Transistor Holders
ACOS MONO PICK-UP HEAD COMPLETE WITH NEEDLES
3 Miniature earpieces complete with plug and lead
20 Diodes. Very high quality
Magnetic Lapel Microphone with plug and lead
3", 4" or 5" Low impedance LOUDSPEAKER
SIGNAL INJECTOR R.F./I.F./A.F. parts and circuit
Car Rev. Counter, Parts and Circuit (excl. meter)
12 pre-set potentiometers mixed
10/- FREE!
P
10
1K. 12/18V supply. 2/
volt operated. List
£8.1 9.6
150
*
6 -Transistor
Price 13 an
HENRY'S RADIO LTD.
*
(17)
Brand New with R/P head,
erase/rise. head, tape cassette
2 speed
and instructions.
2 -track
-
NOMBREX TEST UNITS
(16)
2-SPEED
5y/ß
ft.-31788
£3.19.6
L
P.P.3-
(Maros unit 79/6, p.p. 2/6)
(10)
16)
Fully
for 7; to 16 ohm speaker. 150mV
input. 30c/s to 20k/cs ± 1dB. For use, with
valve or transistor preamplifiers as item
amm7921188au
SrctoriLFPEBLE
MW/LW QUALITY
TRANSISTOR RADIO TUNER
tunable superhet with excellent
sensitivity and selectivity. Output up to
volt peak. Complete with front panel,
etc. 9 volt operated. For use with any
amplifier or tape recorder.
TOTAL COST
P.P.
5
.7
TO BUILD
(14)
VHF FM TUNER
Supplied as 2 Preassembled Panels, plus
(12)
7/3
3/9
6/7/7/9
2/9
6/-
316
-
ECF82
ECF86
ECH35
6/9 PCC89 9/9 17191
9/- PCC189 9/- 11301
8/- PCF80 6/6 17801
ECH42 9/- PCF82 6/9
50E81 5/9 PCF86 8/3
ECH84 8/9 PCF800 10/6
ECL80 8/- PCF801 9/6
ECL82 6/9 PCF805 8/ECL86 7/9 PCL82 8/9
EF39
3/9 PCL83 9/EF41
613 PCL84
7/8
EF80
4/9 PCL85 8/3
F.F85
5/- PCL86 8/6
EF86
6/9 PENA4 8/9
UBF89
17F89
UL41.
111.44
UL84
UY21
UY41
UY85
W76
W77
Z77
8/
8/-
0/
5/
8/
15/5/
8/
3/
2/
3/
Transistors
AC107 13/
AC127
9/
0026
0044
0045
6/- 0071
5/9 0072
9/- 0075
U'BL21
17092
5/6
110085 8/6
7/
4/
4/
VP4B 11/VP132121/-
AD140
AF102
AF115
AF116
AF117
AF118
AF124
AF125
AF126
10/6 AF127
11/6 0022
15/9 0025
UABC80 5/9
UAF42 7/9
11R041 8/9
UBF80
001481 6/
UCL82
UCL83
UF41
UF80
OC81
0081D
UCF80 813 0082
UCH21 9/3 0082D
UCH42 8/9 00170
15/
18/6/
8/
5/161
9/
9/8/
8/
17/
1016/
4/
3j
31
4/
5/
3/
31
5/
5/
7/
READERS RADIO
TORQUAY GARDENS, REDBRIDGE, ILFORD,
Postage on
ESSEX.
CRE 7441
1 valve 9d. extra. On 2 -valves or more, postage 6d. per valve extra.
Any Parcel Insured against Damage in Transit 6d. extra.
623
0A2
0A3
OBI
6/10/ -
6ÁB4
6/6
SAB7
41-
6Á05(1110/62107
4/6ÁF4 10/5/- 6AF6G 11/4/- SAGS . 2/6
6/1A5GT 5/- 6AG7
1A7GT 8/- SANG 10/5/1B3GT 8/- 6AK5
3/10501 5/- 6AL5
106
8/- 6AM5 2/6
10801 6/- 6A2,16 4/10401 81- 6AN8 10/5/10601 7/- 6AQ4
5/6
1H5GT 71- 6AQ5
8/2/6 SANS
1L4
6/1N5GT 8/- 6AR6
6/- 6AR8 17/6
114
6ASI
5/8/104
51- SASS
185
4/6 611570 15/4/6
114
3/- SA TS
11501 6/- SAU6A 6/6
9/104
5/- SACS
6/- 6AV5GTA
105
11/112
10/5/1X21
71- SAPS
122
351- 6AW8Al2/6
17/2C26A
7/- 6B40
7/2034
7/8 6B8
2/6
2051
121- 6B80
4/6
2CW4 12/- SEAS
2021
ó/- 6BA7 15/4/6
2E24
40/- 6BE6
6/2E26 22/6 6BF6
4/- 6BF7 15/3A4
áA5
7/- 6B06G 15/7/6
3A8GT ai- 6BH6
7/6
3AV6
6/6 61326
3B7
51- 6E14 22/6
6BK7A
9/áB28
40/4/- SBL7GTA
306
10/3E29
7/6
3Q4
60/- 6BN6
3Q5GT 616 6BQ7A 7/384
5/- 6B117 1115/314
ó/- 6E18
17/4-65A 80/- SBS7
714E27
60/- 6BW6
4THA
61- 6óW7 10/6/4101
8/- 6BZ6
6BZ7
11/4X150A
2/6
100/- 604
605
814X250B
120/- 6C5GT 6/606
4/5B/255M
11/35/- 609
5E201 9/- 6031 12/5040B 6/6 SOBS
5/SUS
8/- 6CD6GA17/10/5V4G
8/8 6007
8/5Y3GT 5/- OCHS
8)513
716 60L6
11/7/- 60116
áZ40
6/á0L2 10/- 60114 12/10/6A3
12/- 6015
106A7
10/- 6017
0/.
8/- 60'.
óA8
003
0D3
6/6/61-
OZ4A
1A3
ft
Z
Head Office and Warehouse
44A WESTBOURNE GROVE
LONDON W2
Tel. PARK 5641/2/3
Please send all corresilondence and Mail -Orders to the Head Office
3/- 714
6Db
6006
12/6
601(6
8/11/15/6E5GT 8/ 6F1
141SDQOOG
6054
6F4
3(i/ -
8/-
6F5G
6F6G
5/5/-
6F7
6F8G
6F11
SF12
6F13
6F14
6F15
6117
6E18
6F23
51-
6/4/6/6
15/11/6/7/6
10/ 12/-
6124
s/-
9BW6
1001
9Ì6
1002
13/10D1
7110F1
9/10F3
8101019
10118
i/6
10L1
10P13 12/10P14 13111D3
71-
1105
71-
11E3
42181-
1'2AC6
12AD6
12AE6
12AL5
12AQ5
1.2AT6
716
7(7/-
4/-
I
ELECTRONIC VALVES
301113 6/30FL14 11/á0L1
30115
5/6
11/11/30112 9/30116
7/30118
6/6
30119 13/30PL1 10/6
30PL13 12/35PL14 10/6
35A3
10/3545
10/35E5
12/3SL17
6F25
121 6F28
10/6
6H6
2/6J4
9/625G
4/3/6
626
6.170
5/6K6G
616K7GT 5/6K8
8/6K8G
4/6L6GC 7/6
6L17
9/6L18
6/-
12AT7
6N7GT 7/6P25
12/6P28 12/6
12K7GT 7110K8
8/-
35L6GT 6/32144
4/8
3513
10/3514G 4/35140T 8/6
35Z5GT 516
12Q7G
129A7
43íU
6L020
5/-
6Q50
15/-
6007
9/8/-
6Q7
6SA7
6515
6SF7
6007
7117
714
4/71-
4/5/4/-
5/128L7GT7/6
9/-
11/ 7/-
8/11/-
12E1
4/6
20/-
7/-
7/7/65R7
8/8
618
6U4GT 10/6
7/6
6138
6118A
9/6
61601 6/6
6X4
4/6X5GT 5/6
7B7
7B8
705
706
707
12C8
12607
68Q7
716
12AU7 5Ì6
12AV6 5/6
12AV7
12AW6 2ÓÌ12AX7 6/12AY7 10/12B4A 9/12BA6
6/12BE6 5/6
12BH7 6/12BY7 10/-
7171-
6/6SH7
4/6527
7/6/66E7
6SL7GT 6/6SN7GT 4/8
6160
12A U6
6/6
5/8/81-
12807
12SH7
12527
128K7
41-
129N7GT7/6
120E7
5/1487
18/-
2001
2012
20L1
2011
2013
20P4
2015
9/13/13/-
12/12/13/11/-
3505
3505
42
5645
56135
5005
5500
5800
7501
80
ß3A1
SIA1
5142
ß5A3
90AG
90AV
2515
8/25Z6GT 111-
8/-
9000
71-
90CV
150B2
150B3
3001
30015
30017
30018
30E5
301L1
30FL12
7/-
6/3
10/-
11/6
11/10/10/6
111 -
HEADPHONES
DLRS, Low Impedance, balanced armature. Earpieces
can be used as sound powered Microphone 10/,
CHR, High Impedance (2000Iß per inset), 15(-.
No. 10 Assembly. Moving Coil Headphones with moving
coil Hand Microphone fitted with press -to -talk switch.
Rubber earpads. Cord terminated with army type 5 -point
moulded connector. Low impedance, Brand new. 20/- ea.
Small quantity available of second hand assemblies,
checked, in perfect order. 8/8 ea. P. rt P. 3/6 per set.
MOVING COIL METERS
1mA D.C. 2in. round flange, sealed, calibrated
0-30/300
SmA D.C. 2,in. square flange, Westinghouse
30mA D.C. 21in. round flange
75mA D.C. 14in. round, clip mounted, 0.1.0
100mA D.C.14in. round clip mounted, G.E.C
150mA D.C. 111n. round, clip mounted, G.E.0
500mA D.C. 2$iu. round flange
25A D.C. 3;ín. round projecting
10/15/10/10/10/-
6/8/12/8/3
6/-
50LSGT 6/52KÚ
7/-
9001
28D7
30A5
618
12/-
50006027/6
25L6GT 6/6
25140
Fully Guaranteed
First Quality
30/45/13/8/12/25/7/6
5/6
46/46/121-
25/25/10/9/185BTA15/807
9/811
40/812A
832
866A
872A
884
57/6
20/14/40/15/-
955
956
957
958A
3/2/5/-
4/8/7/1267
20/2050
12/4313C 20/959
991
5651
5654
5670
5718
5749
5751
5965
6080
6146
6159
6293
6360
6939
7551
8136
7/6
8/-
10/10/10/-
12/5/25/25/32/60/-
30/45/-
301-
15/-
9/20/AC/HL/DD
9003
A1820
AC/HL/ 8/
DDD 10/AC/SG 13/AC5/PEN
10/AC6/PEN6/AR8
6/ARP12 3/8
ATS25 9/AW6
5/AZ11
6/AZ12
9/A131
9/AZ41
7/C10
12/0E121 15/DA90
4/1)A032 7/6
DAF40 10/DAF91 4/6
DAF92 6(0_4196 6/6
DC90
7/1)0090 7/DF33
8/-
DF64
DF91
DF92
DF96
DH63
DK32
DK40
DK91
DK92
DK96
DL33
DL35
DL68
DL69
DL91
DL92
DL93
DL94
DL95
DL96
011170
DY30
5/2Ì6
71-
8Ì8/11/6/7/6/8
5/10/12/6
56Ì771-
5/6
8/-
0184 616
18800 12/6
E90CC 10/-
192C0
7/E180CC 8/11801 17/6
E18200 23/EA50
2/EABC80 6/6
EAC91 41EAF42 8/6
EBC33 7/-
1E041
EBC81
113090
EBC91
816
613
416
5/-
11E80 7/6
EBF83 S/EBF89 7/EBL31 20/EC86 12/1088 11/EC90
2/6
1091
5/1092
6/6
10035 17/10040 9/6
ECC70 15/-
10081
E0082
E0083
10004
4151-
6/6/6
10085
10086
10088
10091
5/7/-
8/-
3/6
ECC189 11/-
E00804 101E0180 7/-
10E82
7/8
ECF83 121E01'86 9/6
10135
E01142
101181
101183
ECH84
BOLOS
ECL81
ECL82
ECL83
ECL84
E01.85
ECL86
E136
1137A
1139
1140
1E41
EF42
1E54
EF55
E1'80
1E83
1E85
EF86
EF89
EF91
1192
EF93
EF94
1195
EF96
EF97
E198
11183
1E184
EF800
EF804
11811
11812
11814
111-
9/6
5/3
7/6
9/ 7/7/6
8/3
9/8
12/11/6
9151-
8/-
6/9/8/6
11/8/81-
5/-
10/6/6
6/3
5/6
4/2/6
416
PLESSEY ELECTROLYTIC CAPACITORS
100-40011F at 275 V 3/8
241../F at 275 V
2/200µF at 275 V.... 2/6
100-20-5-25µF (100at 350 V; 5µ1 at
20-20111 at 450 V
3/55 V, 25).(.F at 251) 3/0
20-100(1F at 275 V. 3/All voltages are D.C. working. Postage 2/- per order.
....
MULTIMETERS
Type 108-IT; 24 range precision portable meter, 5000
o.p.v. D.C. Volts: 2.5-10-50-250-500-2500V. A.C. Volts:
ì.0-50-100-250-500-2500V; D.C. current 0.5-5-50-500mA
Resistance 2000-20,000 ohms; 2-20 megohms. Power
output calibration in A.C. for 600 ohms line. Complete
with prods and batteries, £5.5.0. P. @ P. 5/-.
20ft. long Remote Control Unit-to-P.B.U. cable,
terminated with 9 -pin socket at each end
Packing and postage, 7/6 per cable.
SET OF THREE CABLES, £4.0.0 carriage paid.
RADIO FREQUENCY THERMOCOUPLE METERS
12/6
Scaled 0 to 1 AMP, 2/in. round projecting
Packing and postage 2/6 per order.
8/6
17/6
8/6
51-
EL38
11,41
EL42
7)6
EL81
9/EL82
8/EL83
7/EL84
413
EL85
7/6
ELM
8/EL90
516
2/6
EL91
EL95
5/EL360 22/EL821 8/EL822 16/15134 13/E3180
171181
EM84
E3185
E187
E191
1E92
EY51
EY81
E183
1184
EY86
81-
7/5/9/MHL4 5(M8/PEN 8/MS/PENT
10/NT8
1616
PABC80 7/6
PC86 11/P088 11/PC97
PC900
7/6
9/-
71-
PCC805 11f-
P0002411/-
6/6/7/71-
9/-
7/6
5/6
7/6
8/5/-
51-
4/-
G81011 40(-
GTE175M
12/0050 25/GM 7/6
0132 10/-
0134 1010137 12/HABC80 S/HBC90 5/1113091
23/-
MH4
MH41
P00189 11/-
61-
1181
E190
5/15/16/45/-
71-
1122
E141
EZ80
7/6
KT44
KT45
KT66
KT67
KT88
LP2
11/-
1187
EZ40
17/6
13141
PCC84 5/6
PCC85 7/PCC89 11/-
7/7/-
6/6
8/-
E135
KT36
5/6
PCE80010/6
PCF80 6/3
PCF82 6/6
PCF87
PCF800
PCF801
PCF802
PCF805
11/8
10/9/6
9/6
11/-
H1309 15/11190
KT2
K132
4/6
7/6/6
PL83
6/6
6/6
PL84
UCF80 9/6
UCH21 9/6
1`CH42 9/-
QQVO3-10
001143 8/U01181 8/3
UCL81 9/-
30/-
QQV06-40
901-
QS83/3 7/6
Q892/10 4/Q895/10 5/6
UCL82 7/3
UCL83 9/UF9
10/-
00150/158/Q81200 10/Q81202 8/6
UF41
UF42
U143
Q81203 8/6
Q91215 12/-
0180
0185
0E86
0189
Q103-12
10/-
1105-26 812
8/-
UL41
UL84
812
8141
9142
U3180
UM81
SP61
0045
11314
15/-
4/5/8/4/15/-
UU5
71-
5/-
401-
010
012/14
8/8/-
'1117
51-
U18/20
6/9/6
8/6
025
026
027
U37
050
052
U70
076
1178
7/- 0191
0193
0251
7/-
9/-
6/6
10/5/10/-
8/9/91-
6/6
9/6
6/-
3/6
X012
X015
4016
20/- 163
7/6
Y65
5/6/6
4/6
9/-
1123
1P41
W81M
W729
X7634
71-
U22
7/6
17185
VT139
8/6
021
7/-
71-
7/6 U141
0182
35/-
81-
10/7/-
UU10
UY1N
UY21
12/TP22
1125
TP2620
TT21
T140
8/9/-
8/-
007
008
009
84112150A
122
5/8/6/-
10/7/6
6/6
4/6
7/-
ß/-
5/5/6
Z62
51163
9/Z66
10/23/Z759
Z803U 15/29007 13/ -
4/4/11/7/6/-
6/8
11113, 80.0V
6/6
7/-
19/6
OAZ204, 6.81
OAZ205, 7.51
OAZ206, 8.2V
OAZ207, 9.1V
6/6
6/6
OAZ211, 7.51
OZA212, 9.11
0A1213, 12.0V
6/-
6/6
6/6
VR575B (5.75V) ..
6/6
8/8/-
VR13A(13.0V)
81-
15/-
0A1224 (6.8V)
,.
10/ -
ZT152
ZT1484
..
54/75/ -
71-
7/-
6/-
30/-
TRANSISTOR CIRCUIT COMPONENTS
Our new price list of Valves, Tubes and Semiconductors is
now ready. In addition to listing prices of some 2,300
types it is a useful reference work giving: Valve and Tube
Equivalents, Specification 01 Microwave Tubes, Cathode
Ray Tubes and Semiconductors. Send S.A.E. (foolscap)
now to get your copy free of charge.
7/U404
5/U801 17/UABC80 5/3
UAF42 9/UB41 10/UBC41 8/-
6/-
30/-
301-
11403
QQV02-6
45/-
R10
PL82
12/12/11/-
1188
81- UBC81 8/P1301 11/- OBF80 6/6
P1800 7/- 1113E89 7/11801 7/- UBL21 10/1130
8/6 0092
QP21
5/- 00084 6/91QP25
5/QP230 5/- 00085 6/6
PCL80 10/8
PCL81 9/PCL82 7/POL83 8/6
PCL84 7/6
PCL85 9(PCL86 8/6
PCL88 10/8
PCL800 12/PCL801 10/6
PEN25 5/1111360 8/PEN45 7/PEN45DD
12/PEN46 6/PEN220A
61-
U301
5/6
PY83
PCF80612/PCF80811/-
ZENER DIODES
250mW 5%:
BZY11, 60.0V ,.
260mW 5%
0A1200. 4.7V ..
OAZ201, 5.11
OAZ202 5.6V
OAZ203, 6.2V
260mW 15%
OAZ208,4.3V ,,
OAZ209, 4.7V
OAZ210, 6.2V ,2.25W 10%
11425E (4.251)
VR475B (1.751)
5.25W 10%
VR7A (7.0V) ,
VR11A (11.0V)
7
5%
OAZ222 (5.6V)
O
1182
OV
PL81
0281
0282
PL302 13/PL500 13/6
PT15
15/1X25 15/PY32
8/6
PY33
8/6
PY80
5/6
PY81
13/-
FERRANTI TRANSISTORS
ZT83
.. 12/..
ZT91
.. 50/..
101-
18/10/ -
9/6
E1.36
6/5/6 11E93
6/715/- 71F94
4/- PEN38310/2/6 11L2
4/- PEN384 7/101- 111,21
HL23
6/PEN453DD
10/1016/6 HL23DD 6/4/- PENA4 7/6
6/6 11L41
6/6 PF86
7/6
8/- HL92
HL94
7/PF818
10/21/12/- HL132D 4/- PFL20014/PL36
9/10/- HL133DD
10/- PL38 18/12/-
11190 7/6
EK90 4/6
EL22 15/1L33 12/6
CABLES FOR T.C.B. EQUIPMENT
Ilft. long Transmitter-to-P.B.U. cable, terminated
with 16 -pin socket at each end
loft. long Receiver-to-P.S.U. cable, terminated
with 12 -pin socket at each end
EL34
EL35
13135
Retail Shop
85 TOTTENHAM COURT ROAD
LONDON W1
Tel. LANgham 8403
Open all day Saturday
When sending cash with order, please include 2/6 in £ for postage and handling
MINIMUM CHARGE 2/-. No C.O.D. orders accepted
POWER UNITS TYPE 234
19in. rack mounting fully smoothed and fused for 230v.
A.C. input. H.T. output adjustable from 180 v. to 270 v.
at 80mA, by means of primary taps and high-low switch
in the secondary winding. L.T. output 6.3 v. A.C. at 4
amps. Fitted with M.I meter to read A.C. input and D.C.
output volts. Second-hand, tested, in good condition
£3.19.6.
DITTO model without meter, £3.10.0.
Packing and carnage 15/ --
624
AERO SERVICES LTD.
I
, .
..
71-
7/-
9/6
66
66
..
Variable Twin Gang Miniature Tuning Capacitor,
two section, 4-165pF, and 3-65pF, with 1-8pF
trimmer, complete with Broadcast Band Oscil6/6
lator Coil
WEYRAD RA2W FERRITE ROD AERIAL,
12/6
LW/MW winding with Car Aerial Coupling
514
P50/1AC OSCILLATOR COIL, MW/LW
5/7
P50/2CC, 470 ke/s., 1st and 2nd I.F.
6/P50/3CC, 470 ke/s., 3rd I.F.
OSMOR Subminiature Transformer for Mains-toTransistor supply conversion, Type MT9, Output
10/9-0-9 v. at 80mA
3/6
Suitable Germanium Diode GJ7M
Packing and postage 2/- per order.
E
PRACTICAL
WIRELESS
blueprints
p
The following blueprints are available from stock. Descriptive text is not available but the date of
issue is shown for each blueprint. Send, preferably, a postal order to cover cost of the blueprint (stamps
over 6d. unacceptable) to Blueprint Department, Practical Wireless, George Newnes Ltd., Tower House,
Southampton Street, London, W.C.2.
The Strand Amplifier
The PW Signal Generator
..f
(Oct 1962)
5/ -
The Berkeley Loudspeaker Enclo..
sure
The Luxembourg Tuner
(Dec. 1962)
5/-
The PW Troubadour
The PW Everest Tuner
(June 1962) 7/6
;
Beginner's Short Wave Two
}
(May 1962)
6/ -
..f
(Nov. 1963)
5/-
(Dec. 1963)
5/-
Beginner's 10 -watt Transmitter
Transmitting and Aerial Data
PW "Sixteen" Multirange Meter
Test Meter Applications Chart
*
f
Transistor Radio Mains Unit
7 Mc/s Transceiver
The Citizen (December 1961)
(June1963) 5/-
..
(June 1964) 5/ -
5/ -
, .
5/ -
The Mini -amp (November 1961)
The PW Britannic Two
The PW Mercury Six
S.W. Listener's Guide
The Celeste 7 -transistor Portable
Radio
..
The Spinette Record Player
The PT Multimeter (October 1961) PT
.
,
f
(Jan. 1964)
5/ -
..
5/ -
The Empire 7 Three -band Receiver (May 1965)
5/ -
..
..
Progressive SW Superhet (February 1966)
PLEASE NOTE THAT WE CAN SUPPLY NO BLUEPRINTS OTHER THAN THOSE SHOWN IN
THE ABOVE LIST. NOR ARE WE ABLE TO SUPPLY SERVICE SHEETS FOR COMMERCIAL
RADIO, TV OR AUDIO EQUIPMENT.
PRACTICAL
WIRELESS
5/-
The Beginner's Short Wave Superhet (Dec. 1964)
Electronic Hawaiian Guitar (June 1965)
..
..
5/5/ -
*
query service
Before using the query service it is important to read the following notes:
The PW Query Service is designed primarily to answer
queries on articles published in the magazine and to deal
with problems which cannot easily be solved by reference
to standard text books. In order to prevent unnecessary
disappointment, prospective users of the service should
note that:
(a) We cannot undertake to design equipment or to
supply wiring diagrams or circuits, to individual requirements.
(b) We cannot undertake to supply detailed information
for converting war surplus equipment, or to supply circuitry.
(c) It is usually impossible to supply information on
imported domestic equipment owing to the lack of details
available.
(d) We regret we are unable to answer technical queries
over the telephone.
(e) It helps us if queries are clear and concise.
(f) We cannot guarantee to answer any query not
accompanied by the current query coupon and a
stamped addressed envelope.
QUERY COUPON
This coupon is available until 8th December, 1966
and must accompany all queries in accordance with
the rules of our Query Service.
PRACTICAL WIRELESS DECEMBER 1966
Tower House, Southampton Street, London, W.C.2, and printed in
Published on or about the 7th of each month by GEORGE NEWNES LIMITED,
Australia and New Zealand: GORDON & GOTCH (A/sia) Ltd. South Africa
England by WATMOUGHS LIMITED, Idle, Bradford; and London. Sole Agents for
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rate including postage for one year: To any part of the World £1.16.0.
Designed by
L. W. Roche
CALL
IN AND
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ONE
PLAYED
*
*
*
*
*
*
MAYFAIR PORTABLE
BUILD THE WORLD'S FIRST ALL
TRANSISTOR PORTABLE ORGAN KIT
ELECTRONIC ORGAN
ACCLAIMED BY EVERYONE!
EASY TO BUILD WITH PRINTED CIRCUITS AND
FULLY COMPREHENSIVE HANDBOOK
CIRCUITS USE 170 TRANSISTORS AND DEVICES
10 SELECTED TONE COLOURS PLUS VIBRATO
PORTABLE TWO COLOUR CABINET WITH DETACHABLE LEGS, MUSIC STAND, SWELL PEDAL
THE ONLY COMPLETE KIT AVAILABLE IN THE
WORLD
FOR GROUPS, CLUBS,
ENTERTAINMENT.
HOBBYISTS,
HOME
SPECIFICATIONS:
TONE COLOURS (ROCKERTABS) 10 DIFFERENT TONES CAN BE SELECTED
CABINET SIZE 351 x 151 x gin.
SWITCHED VIBRATO.
WEIGHT 35 Ib.
49 NOTE C -C FULLY SPRUNG KEYBOARD
6 OCTAVES OF GENERATORS
TONE COLOUR BLEND CONTROL
PRESET VOLUME CONTROL
OUTPUT UP TO I. VOLT
FOOT SWELL PEDAL
110/250 VOLT
FULLY POLYPHONIC.
MAINS OR 18 VOLT BATTERY
PLUG-IN PRINTED CIRCUIT PANELS
SIMPLE LOCKED -IN TUNING
DETACHABLE LEGS WITH STOWAGE
FULLY DETAILED INSTRUCTION HANDBOOK, PHOTOS AND CIRCUITS.
ITEMISED PRICE LIST AND SPECIFICATIONS
UNBEATABLE
FOR PRICE
PERFORMANCE
AND QUALITY
Latest
TO BUILD
YOURSELF IN EASY
STAGES. ALL PARTS
SOLD SEPARATELY
and FULLY GUARANTEED
TRANSISTORS
SPECIAL HI-FI
69/6
SCR's (THYRISTORS)
1
200
400
100
400
AMP SERIES 'WIRE 1.P.51)S
PIT
300PIV
12/6
PIT (280V Ems) ...
PIT, 3 Amp Stud Type ...
PIT 7 Amp (280V Ems)...
.,
,
..
..
HI-FI
DEAC RECHARGEABLE BATTERIES
(2)
EQUIPMENT
3.6 volt 500mA/11
..
.. 12/8, pp. 1/6 Complete
range in
9.6 volt 225mA/H
. 20/-, pp. 1/6
stock. Send list of
15/DEAL CHARGER
requirementsil
or
17/6 To charge 3.6 volt and 9.6 volt packs.
price
quote.
9/8 Fully mains isolated
P.P.special
Hi-fi demonstration
2/451
25/ - in moulded case.
+t
(3)
picete.
SA100. 5
16
ohms. Mains olp td.
£15.15.0
si-.
BUILD A QUALITY 2 OR 4
TRACK TAPE RECORDER
New 3-speed version using new '363' decks
TWO -TRACK. Deck £10.10.0. Martin
Amplifier £14.19.6. Cabinet and speaker
7gns. Complete kits with FREE lin. 1200ft.
tape, spare spool.
Today's Value £45.
P.P. 15/ FOUR -TRACK. Deck £13.10.0. Martin
Amplifier £15.19.6. Cabinet and speaker
7gns. Complete kite with FREE 71n. 1200ft.
tapa, spare spool.
Today's Value £50.
gnsP.P. 15/ (4)
gns
3I
£27.10.0 ;g
WITH TUNING METER
£23.10.0
5P.
I
+-
s 0-
SEEPAGE623FORRTS
MO
READVEI
ARMSTRONG
QUAD
GOODMANS
LEAK.
0 and 200 maybe ROGERS
with any amplifier). TRUVOX
Amplifier in Case.
41+49 watts. 3 to 16 ohms 0/p. Input 80mV
Tuner and P.M.'s. Mains operated. £9.77 q ft C
!
7
68
VHF FM TUNER TO BUILD
87/105 Mc/s Transistor Superhet. Geared tuning. Terrific quality and sensitivity. For valve
or transistor amplifiers. 4 x 33 e 2}in. Com(5)
plete with dial plate. (FM Decoder Kit£5.19.6
P.P. 21-)
TOTAL COST
TO BUILD
(Cabinet Assembly 20/- extra)
£6.19 .6
2g
GARRARD DECKS-Fully guaranteed (with SAP. CART. DIAM.19/6 extra)
All other
5P25 stereo
£5 19 8
210 10 0 4011ess cart./arm £27 1.0 0
£5 19 6
SP25 Deram
£12 19 8 AT6 mono
makes of
£8 19 8
AT60less cart.
£0 6 0
£9 19 6
AT6 stereo
£9 10 0 decks and
2000 stereo
AT60 mono
£8 9 6
£10 10 0 ATO Deram
£11 19 6
30001m stereo £7 10 0 ATOO stereo
£10 19 8
Deecadec Mk.1I £17 17 0
cartridge
SP251ess cart. £9 10 0
AT80 Deram
£13 10 0
A70 less cart.
£17 17 0
in stock
LA1380 less cart. £27 0 0
SP25 mono
£9 19 6
(P. .e P. 5/- any type)
GLOBEMASTER MW/LW/SW
(7)
(8) TOURMASTER TRANSISTOR CAR
PORTABLE RADIO TO BUILD
RADIO
Spec/a/ purchase reduces price
7 -Transistor MW/LW Car Radio. 12 volt
Full 3 -waveband tuning. Pushbutton wave operated. 3 watt output. Push-button wave change. Superhet printed circuit. Black change. RF stage. Supplied built, boxed, LATEST 1966
chromed cabinet 11 x 70 s 3}In. (SW 17-50
ready to use with Speaker and Baffle. Car CATALOGUE
metres). Ear/Record sockets. 1 watt Push/
fixing kit and manufacturers' current guaran- Have you a copy?
Pull output.
tee. Special Bargain Offer. Buy Now! List Fully detailed
and illustrated.
TOTAL COST
,C+.7
Price 13 gns.
L.P.P.
150 pages of
.7 VV3/6
TO BUILD
9.0 3/6
PRICE
components,
'WE CAN SUPPLY FROM STOCK MOST OF
equipment, etc.
THE PARTS SPECIFIED ON CIRCUITS IN
Over 5,000 stock
THIS MAGAZINE. SEND LIST FOR QUOTAitems. PRICE
303 EDGWARE RD., LONDON,
W.2
TION. ASK POR NEW 4 -PAGE CATALOGUE
6/-, post paid.
PADdington 1008/9 (STD 01-723-1008)
SUPPLEMENT ALSO LIST OF SPECIAL HI-FI
Free discount
Open Mon. to Sat. 9-6.
Thurs. 1 p.m.
vouchers with
EQUIPMENT_ AVAILABLE WITH A DISCOUNT
Open all day Saturday
every catalogue.
You cannot afford to be withou
SUPPLIERS OF QUALITY COMPONENTS AND EQUIPMENT
a copy of this catalogue
1000 mono
1000 stereo
2000 mono
Completeit£519
29 gns. ;;6
TSA90. Transistor Stereo
(6)
PM STEREO DECODER
room open.
Also from stock:
VALVE AMPLIFIERS AND TUNERS IN CABINETS
+ 5 watt SA200. 7k + 74 watt
APR 100. AM/FM.
AFM 200. AM/FM
Stereo. 300mV Input F31 version. Also Inputs for tuner to match SA100, Tuner
to match SA200
Tuners, FU's etc. 0/P 4 Mag Mie, Rag PU's, etc. self -powered mains.
to
TOTAL COST
TO BUILD
P.P. 2/
Pall tuningon both bands.
Printed Circuit
Design with Stereo Indicator.
For use with any valve or transistor FM. Uses pot cores to
Mollard design and ger. and
silicon transistors.
Catalogue Supple-
ment.
Free on request.
COMPLETE KIT WITH CABINET,
(CARRIAGE AND
30/- EXTRA
ALL COMPONENTS AND HANDBOOK 99 GNS. PACKING U.K.
ONLY)
BALL PARTS AVAILABLE SEPARATELY
DETAILED
LEAFLET
FREE
BHP AVAILABLE FOR COMPLETE KIT
ON REQUEST
HANDBOOK SEPARATELY, 20/- post paid CALL FOR
DEMONSTRATION
14-page Transistor/Rectifier catalogue now ready. Many LIST ON REQUEST
new devices-plenty of price (1) REGENT -8 MW/LW
reductions. Send 3d. stamp for free POCKETEDIO TO
copy. The Largest Range available.
auperhet.
8 -Transistor
(7)
Geared tuning. Push-pull
speaker output. Moulded
cabinet 5 x 3 x 14in.
Phone socket.
7 -Transistor
Latest 4 -page
Illustrated
LL1 n
£9
HENRY'S RADIO LTD.
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