Apr - American Radio History
35 CENTS
APRIL, 1962
REPORTER
PHoToFAcri
ncluding
Electronic Servicing
I
-_-__=_____=
1
Blueprints for Service Benches
J1U:7
3i7
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31?; l3hly nI
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Automatic Brightness and Contrast Control
Let's Have a Look at Antenna Preamps
Develop Your Own Tube-Test Data
Freak Rasters and Their Causes
Coping With Callbacks
1
Awe
Higher Gain
Lower Noise
85% of all TV servicemen
prefer Standard turret type
replacement TV tuners.
year guarantee backed by
the world's largest TV
tuner manufacturer.
1
Trade-in allowance for the
defective tuner being
replaced.
INDUSTRIES INC.
FORMERLV STANDARD COIL PRODUCTS CO., INC., MELROSE`' PARK, ILLINOIS
of new sets
.......:.. ...PREVIEWS
TUNERB0N1)iNG
Admiral
ST
C
B
RCUIT
tEAKER
Admiral Model 2711
Chassis 20L8
The Model 2711 uses a chassis which
is very similar in many respects to other
TG. SCREWS_
AL GNMENT FR'cQUEiVCIE`_
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MTG.
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GND CLIPS
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AFC DIIO3E
chassis of Admiral's 1962 line, but incorporates certain changes which adapt
it to the 92° short -neck 27YP4 CRT.
For example, the yoke is different from
that used in 23" models. All 27" sets use
the more efficient 1K3 high -voltage rectifier instead of the 1G3.found in some
23" chassis, and the 6DE4 damper is
used in place of the more conventional
6AX4GTB. As in other chassis, a 6K11
compactron is used as a gated AGC-sync
separator -noise inverter, and a 6EW7
serves as a vertical oscillator -output stage.
Among other changes are: Different
peaking coils are used in the video amplifiers, some component values are altered in the CRT cathode and grid circuits, the horizontal -output screen resistor is reduced from 18K to 10K, the
boost capacitor is increased from .027
mfd to .1 mfd, and a capacitor is added
across part of the yoke winding to increase the width.
The rear cover is held in place by
clip retainers, simplifying access to the inside. The chassis must be removed from
the rear of the cabinet, since the CRT
and chassis are separate assemblies.
On the rear chassis apron, certain of
the service controls are covered with
paper stickers to prevent tampering. The
close-up photo shows the sliding top
used on the high-voltage cage, the support clamp for the horizontal output
tube, and a plastic sleeve projecting
from the rear of the chassis (the horizontal hold control).
Width is controlled by a width sleeve
placed around the neck of the CRT,
under the deflection yoke. The picture
guard serves as a sync -stabilizing control,
adjusting the bias on the noise -inverter
section of the 6K11.
The cover shield of the video -IF section can be removed, if necessary to
service the printed board, by removing
four screws (see photo). Access to all
IF adjustments is from the top, and the
alignment frequency for each coil is
stamped on the shield. The video-detector can, near the right end in the photo,
is grounded to the shield by spring clips.
The contrast control is connected to
its knob by a flexible drive shaft, as
seen in the close-up photo. The shaft can
be removed from the control by pushing
forward on the coupling near the chassis.
6,
REPORTER for April, 1962, Vol. 12 No. 4. PF REPORTER is published monthly by Howard W. Sams & Co., Inc., 2201 E. 46th St., Indianapolis
All ocher
Indiana. Second-claas postage paid at Indianapolis, Indiana. 1, 2 & 3 year subscription prices: U.S.A., its possessions, and Canada: $4.00, $7.00, $9.00.
50c
each.
back
iasues
countries: $5.00, $9.00, $12.00. Current single issues 35c Seals;
April, 1962/PF REPORTER
PF
3
PREVIEWS of new set
Emerson
Emerson Model 1554
Chassis 120572-C
This model combines an AM -FMstereo combination with a 19" television
set. The TV section utilizes a 114° aluminized 19YP4 CRT and a glare -free
safety glass. The AM -FM -stereo and
television sections can be used independently, although the speaker system
is common to both.
The TV is divided into two chassis,
one containing the power supply and
parts of the deflection circuits, and the
conother
a printed -board chassis
taining the remainder of the circuits. The
power supply is a half -wave doubler
which makes use of a tapped selenium
rectifier. The power-supply circuits are
protected by a 1.6 -amp slow-blow fuse,
and the filament circuit is protected by
a 1 -ohm fusible resistor.
An 8EB8 tube serves as video output
and vertical oscillator, and an 8EM5 is
used in the vertical output stage. AGC
voltage is developed in the video detector, and controlled by a switch. With the
switch in NORMAL position, two 680 -ohm
resistors are in series with the tuner input
leads. In the DISTANCE position, the switch
bypasses these two resistors and also
shunts a part of the AGC voltage to
ground.
The stereo record changer is a fourspeed type, and shuts itself off after
playing the last record in the stack. It
does not, however, turn off the amplifier.
The stereo amplifier on - off switch,
mounted with the treble control, is a
three -pole type. When the stereo amplifier is turned off, two switch contacts
connect the speaker system to the TV
audio -output transformer. Thus, if the
stereo -section switch is left "on," the TV
sound cannot be heard.
The FM receiver is separate from the
AM -radio RF -IF section, and both can
be tuned independently for simulcast
stereo presentations. The B+ and filament supplies for the AM section are
separate from those of the FM tuner.
The AM power supply (which also supplies the audio amplifiers) is a small silicon rectifier, protected by a 22 -ohm
fusible resistor. The FM tuner receives
B+ from a selenium rectifier, protected
by a 220 -ohm fusible resistor. Filaments
of the three 12 -volt tubes in the FM
tuner receive current from the AC line
through a 530-ohm resistor.
-
4
PF
REPORTER/April, 1962
-
ON-OFF SW
ETC
-1
WITH TREBLE CONTROL,
B
ti
+ PROTECTIVE
RES IS'OR
15E n
B
-F
I
:TER
RESISTOR
ILICCN
RECTIFIEP
FILAMENT
DROP'ING
RESISTOR
B+
SELENIUM
RECTIFIER
PROTECTIVE
I/
RES
13T03
PREVIEWS of new sets
OPERATING
CONTROL`
V. NEIG
Magnavox
EE PLACEMENT
ART
iT
ERT
LIN
FOCUS
SILICON
WIDTH
RECTIFIERS
(
BOTH
HIDDENI
MAGPtALUX
EJUSTMENT
TE2M. STRIP
VIDEO
DETECTOR
?FC
DIODE
Magnavox
CIAC+M
i
UM-SULFI
"MAGNALI"
DE
CELL
Model 2MV360M
Chassis 36-03
The 19" sets in this series use a 114°
aluminized 19BTP4 CRT, while 23" sets
use a 114° aluminized 23MP4. The
chassis in both model sizes are similar.
The short vertically -mounted printed-circuit chassis is typical of the most recent
Magnavox sets. Operating controls are
mounted on a subassembly seen at the
top center of the rear-view photo; the
viewer reaches over the top of the set to
control brightness, contrast, vertical hold,
and horizontal hold.
The horizontal output tube is a newer
type, a 6GW6 which operates at increased
efficiency with a lower -than -usual screen
voltage. The 6GC5 audio output tube is
one of the new 9 -pin tubes which has a
large envelope (known as a T9), and
runs at higher power than its smaller
counterpart (the standard 9 -pin miniature).
Four printed boards-video-IF, video,
audio, and sweep-oscillator-are mounted
on the main chassis, which contains the
conventionally -wired horizontal output
circuits and power supply. The B+ supply is a transformer -isolated voltage
doubler using silicon rectifiers and protected by a 5 -ohm, 10 -watt fusible resistor. Also shown is the terminal strip
used when the set is equipped with remote control. In addition to the fusible
resistor, the power supply of the set is
protected by a circuit breaker in the
primary circuit of the power transformer.
The tuner is one of the small CK-type
"compact" units recently introduced by
Standard Kollsman, and uses a 6GK5
low-noise RF amplifier and a 6CG8 mixer -oscillator. In the photo, note the plastic parts used in the fine-tuning control.
The on -off switch and volume control are
mounted on the tuner bracket.
The Magnalux circuit automatically
compensates for changes in room lighting. This circuit is a bit more than just
an automatic brightness control. The
cadmium-sulfide cell (seen atop the
chassis in the photo) affects the voltage
at the brightness control, and governs to
some degree the voltage on the screen of
the video amplifier. In this manner, it
automatically adjusts both the brightness
and the contrast levels on the CRT. A
three -terminal board on the main chassis
permits adjustment of the range of the
Magnalux controlling voltages, to suit
varying conditions.
April,
1962/PF REPORTER
5
Silvertone
PREVIEWS of new sets
SILICON
FOCUS
4F 'IFIERS
\,'ERT LIN
SNAP OUT TO OPEN
CHASSIS WIDE
HE1GFT
CIRCUIBREAKER
MTG
FORIZ
SCREWS
HOLD
Silvertone Model 21-461
Chassis 528.51894
This chassis is available in both 19"
and 23" models, incorporating a 19AYP4, 19AXP4, or a 23ALP4 CRT (all
114° aluminized types).
This model features the usual "swingout" chassis mounting, released by removing three screws. With some of the
sets, in order to swing the chassis out
far enough to permit access to the entire chassis, it is necessary to snap out
a small plastic mounting clip (see photo).
The silicon rectifier voltage-doubler
power supply is protected by both a circuit -breaker and a 4.5 -ohm, 10 -watt fusible resistor. The 450-ma controlled
warm-up heater string is protected by a
22 -ohm, 7 -watt resistor.
No new or unusual tube types are
found in this model. A 22DE4 damper is
used, along with a 1G3GT high -voltage
rectifier. In the vertical sweep circuit, a
13EM7 functions as a multivibrator-output stage.
The VHF tuner is a turret type, using
a 3GK5 RF amplifier and a 6FG7 oscillator -mixer. A UHF tuner can be used
with this set, incorporating a 3AF4 UHF
oscillator tube. A special UHF position of
the VHF tuner disables the VHF oscillator and connects the RF amplifier and
the mixer to act as IF amplifiers for the
converted UHF signal. Since the UHF
tuner converts the signal directly to the
40 -mc IF range, no further conversion is
needed.
Following the shunt -type video -detector diode (part of a 6AM8 tube) is a
coil called the "tweet" coil. This coil is
broadly self -resonant at 4.5 mc, and
serves to reduce the amount of sound -IF
signal at the AGC take-off point. AGC
is sent from the picture detector to the
first video IF and the RF amplifier,
without benefit of control or clamp, only
the usual AGC filtering.
The audio-circuit components are contained in a module or "pack" which can
be seen in the photo. Components used
in the sync separator are also grouped
in one of these modules. The printed circuit boards are stamped in usual Sil vertone fashion to simplify circuit -tracing and component identification. Two
of these printed -circuit boards contain all
the stages except the horizontal-deflection and high -voltage circuits, which are
conventionally wired on the main chassis.
6
PF REPORTER/April, 1962
V.
FILAMENT
RES I STOR
B+PRO-ECTIVE
'
RESISTOR
TUBE
LOCATION
"e
CHART
le
K2
P
C
DIODE
%
_
1
SOUND -CIRCUIT
'PACK"
4
C
36
nA118A
e1
SPEED
VIDEO
See PHOTOFACT Set 524, Folder
Mfr: Hoffman
SERVICING
zoildotaet
1
Chassis No. 356
VERT OUTPUT
O=. on
Card No: HO 356-1
47K
.01
1600v
1W
6DT5
40
DO NOT MEASURE
Section Affected: Raster.
1.5me9
O®
Symptoms: No vertical sweep. Incorrect voltage and waveform on grid (pins 3 and 6) of
VIO.
70_IO
7000 3-6
.047
(3K,
BÓÓST
41000
77ma
Cause: Shorted feedback capacitor in vertical
multivibrator.
HE GHT
69
What
To Do:
Replace
C64
(10000 mmf
-
me9
1.2meg
2000V).
Mfr: Hoffman
Chassis No. 356
SYNC PHASE INV
Card No: HO 356-2
O
SYNC SEP
®B 6U8A
Section Affected: Sync.
A
6BJ8
60V
KI
Symptoms: Unstable horizontal and vertical
hold. Voltage on plate (pin 1) of V5B may
be too high.
To Do:
105V
lä
I
240V
18000
1W
Replace C51 (100 mmf).
.0011
®4
220K
VIDEO OUTPUT
140
1.30
OA
444
730V
m
Chassis No. 356
Mfr: Hoffman
Card No: HO 356-3
Section Affected: Sync.
Symptoms: No vertical or horizontal hold. Incorrect waveform at grid (pin 9) of VSA.
-12V
.
Cause: Open coupling capacitor between video
output and sync separator.
-.8
Cl0m7o
47000 4W
470
28
mml
l01
Replace C49 (.0022 mfd).
3000
y
39K
.1V
CONTRAST
a4'4
725V
C)
4700
27
22K
=mm7
2W
27K
R3
To Do:
4700
4700mmfT97m7
4700
What
82000
8200n
T2200mm1
separator.
What
nK
1W
cs4
Cause: Leaky plate -bypass capacitor in sync
2
3
2tW
240V
-f-
SYNC SEP
Q1,
M
6U8A
60V
220mm7
N750
T6 B
25
330K
2.27699
April, 1962/PF REPORTER
7
I
SPEED SERVICING
VIDEO
oiliestag
See PHOTOFACT Set 524, Folder
_1_
Mfr: Hoffman
l
Chassis No. 356
HORIZ OUTPUT
Sti
6CG7
1
í©
6D0613
Card No: HO 356-4
HORIZ MULI
Section Affected: Raster.
6
470mm1 IOS
22K
Ñ7í0
10ma
Symptoms: Insufficient width. Low voltage at
100.
plate (pin 6) of V11. Incorrect waveform at
grid (pin 5) of V12.
10%
,z)
T
330me
120K
IOF
10K
ZH
2301/
240V
Cause: Plate -load resistor of horizontal multi vibrator has increased in value.
What
85V
7875 "
To Do:
Replace R84 (120K).
Mfr: Hoffman
Chassis No. 356
Card No: HO 356-5
Section Affected: Sync.
Symptoms: Horizontal-multivibrator frequency
drifts out of lock -in range. Voltage too high
on cathodes (pins 3 and 8) of V11; incorrect waveform amplitude at grid (pin 7) of
V11.
Cause: Cathode resistor of horizontal multi -
vibrator increases in value.
What
.7V
150V
30%
30%
R82 (1500 ohms).
To Do: Replace
Mfr: Hoffman
Chassis No. 356
Card No: HO 356-6
VERT
MULI
1W
Section Affected: Raster.
VERT MULTOTK
®A 6CG7
6CG7
90V
vertical sweep. Low
voltage on plate (pin 6) of V9B; incorrect
waveform at cathodes (pins 3 and 6) of V10.
Symptoms: Insufficient
®2lore20mm1
--I
F-
.0033 10%
T
mml
-1.011
.047
2.SV
x
680K
Cause: Plate -load resistor of vertical multi -
,
240V
vibrator has increased in value.
BOOSTV
R6
1000.
VERT
What
Ho
L 5meg
2.7meg
10
j-
1.2meg
VERT LINEARITY
Imeg
8
PF
REPORTER/April, 1962
w.
680K
1
To Do: Replace
R65 (680K).
VIDEO SPEED SERVICING
See PHOTOFACT Set 496, Folder 2
Mfr: Zenith
.
Chassis No. 16E21
es
HORIZ OSC
HORIZ AFC
®6GH8
Card No: ZE-16E21-1
(9
Section Affected: Sync.
Symptoms: Picture
sync.
I
9e«ea
1
190V
®7
100K
®
C61
V
drifts out of horizontal
-59
-
f
;
470
6B0mml
10A1
/
®j
Cause: Grid resistor of horizontal oscillator increases in value, reducing the negative bias
on grid of horizontal oscillator.
1
®
mml
OC61
100KL1e$68n°
HORIZ
HOLD
270V
15ÓBm~ml
1500
mml
120K
lOfmml
26
OZmmf
I20K
I
AT
B
47K
6.8me8
3
®1#
18K
650V
BOOST
047
What To Do: Replace R78 (6.8 meg).
270V
3
TERMINALGUIDE 115
Chassis No. 16E21
Mfr: Zenith
Card No: ZE-16E21-2
Section Affected: Sync.
Symptoms: No horizontal or vertical hold.
Cause: Resistor in sync -separator input circuit
has increased in value. Voltage at sync -input
grid (pin 9) of V5 is lower than normal.
What
To Do: Replace
R46 (8.2 meg).
Mfr: Zenith
Chassis No. 16E21
Section Affected: Raster.
®
Symptoms: Distorted vertical sweep; vertical linearity control has no effect.
cathode -bypass capacitor in
vertical output stage.
What To Do: Replace Cl (40-80-100 mfd
400-400-50V)
e
VERT OUTPUT
°
2.2
015
1118V
.1
1
650VVERT
BOOST
82K
L.
1000
DO NOT
MEASURE
0
3500
SV
3
c
BLUE
8
4.50
®22®e
15
RS
®#
100
`
-
©
®66EA7
Card No: ZE-16E21-3
Cause: Shorted
68K
---1-- J
4700
0
1W
1
15050
STOP
63000
SIZE
VERT LINEARITY
270V
.
/30v
301,
April, 1962/PF
REPORTER
9
SPEED SERVICING
VIDEO
See PHOTOFACT Set 496, Folder 2
190V
001.
Mfr: Zenith
Chassis No. 16E21
Card No: ZE-16E21-4
Section Affected: Pix.
30K
TAP
110K
CONTRAST
Symptoms: Brightness
always at maximum;
control has no effect. Voltage at cathode (pin
1) of picture tube remains at zero.
56000
g0
120K
®
®
470K
7ì000
50mm1
1W
4W
PICTURE TUBE
21CXP4
250K
1.5
1W
270V
BRIGHTNESS
3meg
22
FOCUS
650V
Cause: Open resistor in series with brightness
control across boost source.
What To Do: Replace R39 (1.5 meg
-
1W).
BOOST
650V
BOOST
Mfr: Zenith
Chassis No. 16E21
Card No: ZE-16E21-5
Section Affected: Pix.
Symptoms: Picture flashes off and on. Ab-
normally high voltage at cathode (pin 6) of
V4A.
Cause: Cathode resistor has burned open, possibly because of a short or arc in video output tube.
What
To Do: Replace R33 (15 ohms) and
check for shorts and arcing in V4 (6EB8)
.
HE
3RD VIDEO IF
®6DK6
5
!l
160V
Mfr: Zenith
Chassis No. 16E21
deo
CAIN
%
Card No: ZE-16E21-6
0V
4.7
mml
1.5V
5.5mm1
14470
10A
e. Smell
Section Affected: Pix.
Symptoms: Smeared, negative picture.
470
mnt
SLEEVE
10%
1200
®
Cause: Open video -detector choke.
POWDERED IRON
82000
3W
470mm1
10%
0
What To Do: Resolder leads of L6, or replace.
270V
10
PF
REPORTER/April, 1962
........:..
: ;;:::>;.
*?
,.>:
.
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YHY
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Vinyl has long been famous for its super toughness and
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PRODUCTS COMPANY
GENOA, ILLINOIS
C -
62
Printed in U.
S. A.
Tarzian offers
ONLY
FAST, DEPENDABLE
TUNER
REPAIR SERVICE
ALL
Á
MAKES
INCLUDING
ALL
nRTS
and LABOR
It just makes sense that a manufacturer of tuners should
be better -qualified, better -equipped to offer the most dependable tuner repair and overhaul service.
Sarkes Tarzian, Inc., pioneer in the tuner business,
maintains a complete, well-equipped Factory Service Dept.
-assisted by Engineering personnel-and staffed by specialized technicians who handle ONLY tuner repairs ..
on ALL makes and models.
Tarzian-made tuners received one day will be fixed and
24 -HOUR SERVICE
.
shipped out the next. Cost is only $8.50 and $15 for UV
combinations. That includes ALL parts (except tubes
which are furnished at our cost) and labor, and a 6 -month
guarantee against defective workmanship and parts failure
due to normal usage. Replacements available at low cost
on tuners beyond practical repair.
®
Tarzian-made tuners are identified by this stamping.
When inquiring about service on other tuners, always
filament .. .
shaft length
give tube complement
IF frequency .. .
series or shunt heater
voltage
chassis identification. All tuners repaired on approved,
open accounts. Check with your local distributor for
Sarkes Tarzian replacement tuners, replacement parts, or
repair service.
...
...
...
...
TUNER DIVISION
SERVICE MANAGER
bloomington, indiana
edison 2-7251
east hillside drive
AIR
SEMICONDUCTORS
AUDIO
AM -FM RADIOS
TRIMMERS
FM RADIOS
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.
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111 Tuners Repaired
oni
Approved, Open Accounts
DEPT. 3A
\-T-1SARKES TARZIAN INC
MANUFACTURERS OF TUNERS
6 -MONTH WARRANTY
...
.
.
.
See your distributor, or
use this address for fast,
factory repair service
.
April, 1962/PF
REPORTER
13
publisher
Howard W. Sams
general manager
: REPORTER
Mal Parks, Jr.
editor
Verne M. Ray
associate editors
Forest H. Belt
James F. Galloway
Thomas A. Lesh
George F. Corne
Electronic Servicing
including
VOLUME 11, No. 4
Previews of New Sets
Robert B. Dunham
Joe A. Groves
Admiral Model
Magnavox Model 2MV360M (Chassis 36-03),
Silvertone Model 21461 (Chassis 528.51894).
Paul C. Smith
Video Speed Servicing
art director
Letters to the Editor
The Electronic Scanner
Sfock Guide for TV Tubes
Freak Rasters and Their Causes Allan
advertising & editorial
assistants
Georgeanna Caldwell
Paula Haffner
Bastin
Robert N. Rippy
7
Service hints on Hoffman Chassis 356
and Zenith Chassis 16E21.
Anthony M. Andreone
production manager
3
L2711 (Chassis 201_8),
Emerson Model 1554 (Chassis 120572C),
Georg_ e B. Mann
C. P. Oliphant
E.
Shop
28
F.
Talk-Explanations for rare visual symptoms
you won't find in the "book."
Kinckiner
32
34
Automatic Brightness and
Contrast Control
Forest H. Belt
36
Robert W. Reed
Howell Co.'s All Taped Up
C. Thomas
38
advertising sales offices
Audio Facts-This Texas firm makes profits
from tape recorders in several ways.
m id reste rn
Blueprints for Service Benches
Light-sensitive resistors are the "brain" of
self-regulating video circuits in new TV sets.
photography
PF REPORTER
Coping With Callbacks Art Margolis
2201 East 46th Street, Indianapolis 6, Ind.
Clifford 3-6441
eastern
Curbing TV Radiation
Do the sets leaving your shop comply with
FCC regulations on suppression of stay RF?
western
The Maurice A. Kimball Co., Inc.
2550 Beverly Blvd., Los Angeles 57, Calif.
Dunkirk 8-6178; and 580 Market Street,
Room 400, San Francisco 4, Calif. Exhrook 2-3255
Cost of Doing Business Forest H. Belt
66
Putting "Silent Sound" to Work
R.
H.
Product Report
106
108
Monthly Index
on free literature card
trademark of
is
herein. Acceptance of advertising does not in
any manner signify the products, policies and
services so advertised have been approved,
endorsed or recommended by this magazine.
Indexed in Lecfrodex.
Printed by the Waldemar Press Div.
of Howard W. Sams & Co., Inc.
82
94
1962 by Howard W. Sams &
written permission. No pctent liability
Burke
Free Catalog & Literature Service
ABC
assumed with respect to use cf information
E.
The Troubleshooter
Cy L'4 e
Howard W. Sams & Co., Inc. No part of
PF Reporter may be reproduced without
74
How to check tubes not listed on
your tester's roll chart.
'.e
PF REPORTER is a
McDonald
Develop Your Own Tube -Test Data William
Indianapolis 6, Indiana
-
58
Servicing Industrial Electronics-Ultrasonic devices
can't be beat for cleaning parts.
Address all correspondence to
2201 East 46th Street,
e
Jim Galloway
Dollar and Sense Servicing-A profit -and -loss
statement tells you if costs are getting out of line.
PF REPORTER,
sty
52
Quicker Servicing-Give the customer and the
tip you off to future troubles!
set a chance to
Charles Horner
Howard W. Sams & Co., Inc.
3 West 57th Street,
Nev., York, N. Y.
MUrrcy Hill 86350
40
Part 1-Detailed plans for a general-purpose,
one-man bench setup.
John Groce, advertising sales manager
©
22
Reports on all available units, explaining
what the specifications mean.
Pat Tidd, Mgr.
Constance 3land, Ass';.
Katherine Smith, A.ss't.
Co., Inc.
18
Let's Have a Look at Antenna Preamps Jim Galloway
circulation fulfillment
Copyright
1962
CONTENTS
coesuMieg editors
Willicm E. Burke
Rath
APRIL,
ABOUT THE COVER
A
is
well -arranged service bench
indispensable in helping you
turn out more work with less
fatigue. For complete scale
drawings of an expertly -designed
bench you can build, turn to
page 40.
ef REPORTER
CAN YOU SOLVE THIS MYSTERY?
(Using the clues below, identify the Company that offers you the industry's best service)
Service technicians-and set manufacturers, as well-use this company's capacitors oftener than any other brand.
Providing the right sizes, styles, ratings, mountings, this company offers the
industry's most complete capacitor line.
Replacements for new capacitors in latest model sets are promptly made available to the service technician.
A continuous research program, employing a staff of over 500 scientists, engineers and technicians, assures our ability to keep up with new capacitor needs.
Guaranteed for performance and dependability, every type of capacitor we
make is double-checked by our rigid quality control program.
Unequalled service aids include replacement guides, wall charts, service manuals,
capacitor calculators, and other technical helps which simplify your job of
correct capacitor selection and replacement.
Effective posters and advertising mats are available to you as part of our
customer relations program for dealers.
WHO ARE WE ? If you still don't know the answer, read the initial letter
of each of the sentences above. This is the name that stands for the most complete and best quality line of capacitors, unsurpassed service help, continued
technical assistance-and less call-backs for our friends, the service technicians.
April,
1962/PF REPORTER
15
TVL TWIST -LOK®
CAPACITORS
toughest
These 'lytics take on the
maxigive
duty,
TV and radio
without
service,
-free
trouble
mum
dependable
HUMMM! They are low temand
high
at extremely
etched
peratures. Cathodes are ripple
high
of
needs
the
to meet
voltages.
currents, high surge
TVA ATOM®
CAPACITORS
Atom tubulars are service favorites because they fit anywhere,
work anywhere. They're the only
small size 85 C (185 F) capacitors in ratings up to 450 WVDC.
They have low leakage current,
long shelf life, and withstand
high ripple currents, high surge
voltages.
f
TE LITTL-LYTICe
CAPACITORS
best
The very
mentsforultra-miniature
retransistorcircuits,
placeoffering
through ll
welded construction
No pressure
open"
joints to
cause
or
Long shelf intermittent circuits
life
porta in
he year sets used only partim -
of
vCAPACITORS
rite( II-LYTIC
These single -ended molded tubulars are the ideal replacement
for units of this type found on
printed wiring boards.
Keyed terminals assure fast manual mounting and correct polarity. Resin end fill protects against
drying of electrolyte or entrance
of external moisture.
PC
CAPACITORS
of
circuit versionbase
The printed
Universal
cirthe Twist -Lok.
of the printed No
any
replaces
today.
use
cuit 'lytics in
adapters to
mounting
makeshift
add extra
or
damage capacitor
of high
height ... no possibility
resistance contacts.
16
PF
REPORTER/April, 1962
every value
every rating
every style
Shown here are the more popular of Sprague's big familÿ
of Electrolytic Capacitors, the broadest in the industry.
Other types include Metal -encased Screwbase; Plastic encased High -MF; Metal -encased Octal -base; Ultra -low
leakage Photoflash. All are listed and described in Sprague's
NEW Catalog C-614. Get your copy from any Sprague
distributor, or write Sprague Products Company, 105 Marshall Street, North Adams, Massachusetts.
*TRADEMARK
SPRAGUE®
THE
MARK OF RELIABILITY
WORLD'S LARGEST CAPACITOR MANUFACTURER
©1962 VOLKSWAGEN Of AMERICA, INC.
_GGGESTEO RETAIL PRICE. EAST COAST. P.O.E.; 52,115 WEST COAST.
The truck that thinks it's a station
We made it with seats and windows.
But a truck is what it is.
Take out the seats and you con put in
1,786 pounds of anything.
In just about any size or shape. The
doorway's almost 4 feet wide.
For business deliveries, this Volkswagen
costs so little to run that you can make a
profit even on dinky orders.
2'i2á a mile seems to be average for
most owners. For gas, tires, everything.
(Almost all our trucks get over 20
miles a gallon. Some even get 30.1
For weekends, you can take 8 relatives
anywhere you might want to take 8 relatives.
(If you're just taking them away, there's
room for their luggage on the rear shelf.
wagon.
All their luggage.)
We cal) this the Volkswagen Kombi.
All the usual VW virtues go with lt.
Rear -engine traction in snow and sand.
The air-cooled engine that can't freeze
up or boil over. And the price,
another interesting VW virtue.
$2,095. *
New.
LETTERS
T
a
EDITOR
tool chest
in your
pocket
for electronic assembly
and service work
TO THE
Urui Iai1 r:
In "Getting Into the Background
Music Business" (February issue), I note
that no reference was made to ASCAP
or BMI royalty fees for the use of back ground music in commercial establishments.
I believe you will find that these fees,
which are based on the size and type of
business using the service and the number of speakers involved, must be paid
somehow on a regular basis in order to
use practically any tape recorder, offthe -air programs, or even records. I can
cite instances in my own area where
small stores or restaurants who attempted
to use a home tape recorder or hi-fi set
for background -music purposes have
been forced to pay these license fees.
I would appreciate a complete explanation of these royalties in a future
issue. Since my company has been eying
this field, I personally would like to
know the requirements for licensing under BMI and ASCAP.
IRVING J. TONER
Shockproof (UL), breakproof,
plastic handles with clips
ROUND
BLADE SCREWDRIVERS
and %" x 2", 3", and
4" blades
PHILLIPS SCREWDRIVER
Point size #0, 2" blade
BERYLLIUM -COPPER
SCREWDRIVER
Non-magnetic, non -sparking
%" x 2" blade
NUTDRIVERS
10 Hex sizes from
11,4" blades
3/,2"
to %"-
Color coded handles
TERMINAL WRENCHES
Fit /4" and %6" O.D. spanner nuts
on external antenna and phone
jacks of transistor radios
Toner Radio & Television
East Aurora, N. Y.
Dear Editor:
Mr. Len Buckwalter's article in your
February issue covers some of the steps
a TV or hi-fi service shop proprietor
must take to enter the background -music
business. If any of your readers were
encouraged to try, we suggest that a few
details be added.
Mr. Buckwalter neglected to mention
the 8% Federal excise tax on all air and
wire transmission. Also missing were the
monthly payments to ASCAP and BMI
for permission to use their copyright
music, either by wire, air, or on -premise
recordings. In addition, the problem of
assembling a suitable music library isn't
as simple as described. Proper programming, the crux of a successful operation,
is a field for experts.
STANLEY WARREN
WRITE FOR LITERATURE
Director of Public Relations
Muzak Corporation
New York, N. Y.
Dear Editor:
I
read with interest, and quite frankly
a little dismay, the February Audio Facts
column. Under "Tape" on page 29, it
PROFESSIONAL
POCKET TOOLS
XCELITE, INC.
Canada:
IR
PF
Cares
ORCHARD PARK, N. Y.
W.
Pointon, Ltd., Toronto, Ont.
REPORTER/April, 1962
stated,
"Music reproduced on tape is least
practical for local systems. Reels have
to be loaded or reversed every hour and
a half, the selection of prerecorded tapes
is limited, and building a library is expensive."
Our company manufactures a self -re-
versing tape player with 101" reels, the
Crown Mus-O-Matic, which will give six
hours of continuous play at 334 ips
without repetition. Also, I believe you
will find that good quarter -track and
half-track tapes are available at prices
comparable to LP discs.
The cost of owning a self -reversing
automatic tape player, plus even a rental
background - music program, would be
less expensive in the long run than to
use the telephone lines as recommended
by the writer of the article.
JOHN ANDREWS
Sales Manager
Crown International
Elkhart, Ind.
Thanks to all of you for contributing
more information to help the prospective
background - music installer decide what
type of system will best suit his customers'
needs.
Mr. Toner, your suggestion that we
specific information on BMI-
supply
ASCAP licensing is an excellent one and
will be acted upon.
Ed.
Dear Editor:
I wonder if I can receive information
about the basing of the new tubes such
as Compactrons and novars which have
recently come out. What I would like to
do is design a socket box that would
allow me to check all these tubes on my
emission -type tube tester. I know that
adapters are on the market, but am informed that they are for testers of the
Gm type.
O. A. KINCH
Battle Creek, Mich.
Adapters which can be used with any
emission tester are now becoming available. A couple of examples are the Sen core Model TM116 (page 40, February
issue) and the Walsco "Nuvistor Socket
Adapter" covered in our November Product Report column.
Ed.
Dear Editor:
We believe that the listing of Nichimen
Co. as an importer or manufacturer
of transistor radios under the name
"Olimpic" (page 25, January issue) was
in error.
We have been informed by Nichimen
Co., Inc., that they have never imported
or distributed any radios with the brand
name "Olympic" (which is a registered
trademark of ours) except on our behalf.
Most likely the spelling of the name
"Olimpic" resulted from a typographical
error; but, in any event, we would appreciate your informing your readers
that replacement parts for Olympic radios
may be ordered only from Olympic Radio and Television Division of The Siegler Corporation, or its authorized distributors.
FRANKLYN P. ROSENFELD
Assistant Counsel
Olympic Radio & Television
Division of the Siegler Corp.
Long Island City, N. Y.
The information on "Olimpic" was obtained originally from a list of importers
furnished by the Japan Trade Center; this
was the source of the misspelling. The
TESTS
TESTS
All TV and Radio
Tubes-Old and New
the Nuvistors
and Novars
TESTS
the New 12 -Pin
Compactrons
TESTS
the New 10 -Pin Tubes
TESTS
for True Dynamic
Mutual Conductance (Gm)
TESTS
European Hi-Fi Tubes,
Voltage Regulators, and
Most Industrial Types
OBSOLESCENCE
PROOF
Designed for Maximum
Use Today and
Tomorrow
N EWEST
FINEST
MONEY-MAKER
for Professional
Servicemen
with
Gm
Multiple -Socket Speed
Accuracy
PLUS OpROTECT ONE
TESTS BOTH OLD AND NEW TUBE TYPES-SELLS MORE TUBES PER CALL
Model 100
DYNA-QUIK
Fastest, Most Complete
Most Up -to-Date
DYNAMIC
MUTUAL CONDUCTANCE
TUBE TESTER
See your B&K Distributor,
or Write for Catalog AP18-R
Again you benefit from proved B&K techniques! This up-to-date, obsolescence -proof, professional instrument is designed for maximum use
today and tomorrow. Provides multiple -socket section to quick -check
most of the TV and radio tube types the true dynamic mutual conductance
way-plus simplified switch section to check new tube types in DynaQuik emission circuit. Also includes provision for future new sockets.
Makes test under set -operating conditions. Checks each section of
multi -section tubes separately. Checks for all shorts, grid emission,
leakage and gas. Makes quick "life" test. Exclusive adjustable grid
emission test provides sensitivity to over 100 megohms.
Makes complete tube test in seconds. Checks average set in a few
minutes. Discovers weak tubes that need replacement. Satisfies more
customers. Sells more tubes. Saves call-backs. Insures your reputation.
Patented automatic compensation for line voltage variation. Large 4W plastic
meter with easy -to -read "Replace-Good" scale. Lists most commonly used tube
types with settings directly on socket panel for fastest operation. Complete
listing in reference chart in cover. Phosphor -bronze contacts for long life. 7, 9,
and 10-pin straighteners on panel. Operates on 117 volts 50-60 cycle p.c. Handsome leatherette-covered carrying case.
Net, $16995
Size: 16í's" x 15%" x 5%" deep. Net wt: 15Yí lbs.
NEW TUBE INFORMATION SERVICE
months, on subscription,
Available every 3
for all B&K Dyna-Quik Tube Testers
BaK MANUFACTURING CO.
CHICAGO 13, ILL.
Canada: Atlas Radio Corp., 50 Win gold, Toronto 19, Ont.
Export: Empire Exporters, 277 Broadway, New York 7, U.S.A.
1601 W. BELLE PLAINE AVE
April, 1962/PF
REPORTER
19
new
way the chart was set up also gave the
Sonotone
Cartridge
6-Paks
make it
easy to
STOCK
SAVE
SERVICE
SELL
STOCK-Hang it on the wall, stand it on a shelf, slip it into
your caddy. Cartridge model number is always visible for
quick identification.
SAVE-Save money on purchase of any 6 SONOTONE cartridges-save time by always having the right replacements.
SERVICE-You always have the right replacement to service
virtually every record player on the market.
SELL-In your shop, an eye -compelling display (unique bonnet fits over 6 -Pak to remind your walk-in customers to
modernize their record players). In your caddy-a variety of
cartridges for nearly every replacement.
Every time you buy 6 SONOTONE cartridges from your distributor, they come in the new attractive 6 -Pak cartridge
sleeve. You can select any 6 SONOTONE cartridges, or one of
three pre -selected 6-Paks which include the most needed cartridges for the most often faced replacement situations.
STEREO 6-PAK-covers nearly every stereo replacement or
conversion. Six stereo cartridges from the audiophile's favorite, the 9T, to the budget -priced stereo crystal cartridge, the
12T. Consists of models : 9T, 8T-A, 16T, 18T, 10T and 12T.
STEREO/MONO 6-PAK-covers most stereo or mono replacement needs. Consists of 3 stereo ceramics models 8T -A, 9T,
16T ; and 3 mono ceramics : 1P, 2T, 3T.
MONOPHONIC 6-PAK-covers virtually all most called for
monophonic replacements. "LB" denotes "less bracket" for slim
tonearms. Consists of models; 1P, two 2T's, 2T -LB, 3T -LB.
The 6 -Pak is just another way that SONOTONE simplifies
your inventory and makes it easier to sell cartridges. Order
a SONOTONE 6 -Pak today at your parts distributor.
FREE: The new SONOTONE cartridge cross-reference chart catalog is available at your distributor, or write : Dept. PF-4
SONOTONE® CORPORATION
ELECTRONIC APPLICATIONS DIVISION
Cartridges
Speakers
Tape Heads
Mikes
ELMSFORD, NEW YORK
In Canada: Atlas Radio Corp., Ltd. Toronto
Electronic Tubes
Batteries
Hearin` Aids
erroneous impression that Nichimen makes
parts available for Olympic radios. We
appreciate the opportunity to straighten
out this matter.-Ed.
Dear Editor:
"The Right Way to Install Antennas"
(pages 30-31, February issue) uses 13
photographs to prove that a technician
should strive to obtain the best picture
possible. Being a master electrician as
well as an electronics technician, I am
disappointed that the article did not follow all the provisions of Article 810, National Electrical Code,
For instance, a ground conductor is
shown connected to a driven ground rod.
If an underground water piping system
is present anywhere in the building. it
is mandatory that the TV grounding conductor be properly connected to the
water pipe instead. The N.E. Code also
requires that all metal masts be grounded,
but when driven rods are used, it is illegal to use the electric service ground
rod for this purpose. A separate rod
should be provided at least 6' from the
electrical ground rod.
In the picture at the top of page 31,
it must have been difficult to bring the
antenna lead-in down the outside of the
building between the electrical service
attachment and the telephone cable and
still maintain the proper clearances as
given in the N.E. Code.
The location shown for the drip loop
is the very spot where a lightning arrester should have been installed.
Another picture gives advice to utilize the holes already drilled for electrical
cables, to save effort and time in fishing
the TV antenna lead through the floor.
The N.E. Code prohibits use of these
holes unless armored cables are used, or
the TV wires are covered with enough
extra flexible tubing. A separate nonmetallic box 16" away from the lighting
receptacle will look just as nice without
disturbing the wiring installed by the
electrician.
Further reprinting of the N.E. Code
would require permission from the National Fire Protection Association, but
it should be possible to purchase a copy
of this code at the Building Inspector's
office in your city hall.
WALTER S. HINCKLEY
Springfield, Mass.
As we hang from the antenna mast,
we want to tell all readers, "Don't get in
this fix-check the code!"-Ed.
Dear Editor:
The first thing I noticed in the January
PF REPORTER was the article on troubleshooting vertical sweep circuits from A
to Z. Hurray for us
I hope you continue to produce these articles, as they
are what some of us need. There are
lots of articles of this nature that could
be written. Such interesting items mean
much to the serviceman, because they
bring back things that tend to slip his
mind. Keep up the good work and articles, please!
-
-
HENRY L. MARPLE
Buckhannon, W. Va.
We will
it's our bread and butter!
-Ed.
DOUBLES YOUR EFFECTIVE MANPOWER
Dogs"
Fast!
Fix "Tough
Save Half
Your Time
Your Profit!
to
Sp
MODEL
1076
TELEVISION
ANALYST
for Black & White and Color
Okak oAQ circuits-Putipáutit
TVtîtoab&J,vt »tiìuflJs
By Easy Point -to -Point Signal Injection,
You See the Trouble on the TV Screen and
Correct it-Twice as Fast and Easy!
There's no longer any need to "lose your shirt" (and
customers)-and worry about the lost hours you never
recover-on "tough dogs" or even intermittents. The
remarkable B&K Analyst enables you to inject your
own TV signal at any point and watch the resulting
test pattern on the picture tube itself. Makes it quick
and easy to isolate, pinpoint, and correct TV trouble in
any stage throughout the video, audio, r.f., i.f., sync,
and sweep sections of black & white and color television sets-including intermittents. Makes external
scope or wave -form interpretation unnecessary. Most
useful instrument in TV servicing! Its basic technique
has been proved by thousands of successful servicemen
the world over.
The Analyst enables any serviceman to cut servicing
time in half, service more TV sets in less time, really
satisfy more customers, and make more money.
Model 1076. Net, $29995
Available on Budget
See Your BBK
Terms. As low as
$30.00 down.
Distributor or Write for Bulletin AP18-R
Combines all the features of both
the Model 1075 and Model A107
COMPLETE R.F. and I.F.
HI-VOLT INDICATOR
VIDEO TEST PATTERN
YOKE and HI -VOLTAGE
TRANSFORMER TEST
COMPOSITE SYNC
FM MODULATED AUDIO
COLOR PATTERNS
HORIZONTAL and VERTICAL
PLATE and GRID DRIVE
B+
BOOST INDICATOR
Also Now Provides:
SWITCH -TYPE TUNER
NEGATIVE BIAS SUPPLY
AGC KEYING PULSE
PICTURE TUBE MODULATION
B&K MANUFACTURING CO.
1801 W. BELLE PLAINE AVE
CHICAGO 13, ILL.
Canada: Atlas Radio Corp., 50 Wingold, Toronto 19, Ont.
Export: Empire Exporters, 277 Broadway, New York 7, U.S.A.
April, 1962/PF
REPORTER
21
ADD A NEW SIGN TO YOUR DOOR
The
Electronic
Scanner
Free Window Poster
A series of shop -window posters
RADIO REPAIR
TV SERVICING
MOBILE
COMMUNICATIONS
Let RCA Train You at Home in
-
COMMUNICATIONS
A completely new RCA Institutes course with brand new opportunities
COMMUNICATIONS ELECTRONICS.
for electronic technicians
...
1962 starts a new era in mobile communications when you get
your FCC License. Under the skilled direction of RCA Institutes
experts, you can obtain at home the technical qualifications for
employment in the Communications Industry. In addition to preparing you for an FCC license, you are supplied with the training
needed to service and maintain 2 -way radio communications for
truck and taxi fleets, police, fire, bus, railroad and other public
service vehicles. You also get the technical foundation for advancement in space and aviation communication electronics. This
is not a cram course ... not a rehash of old radio lessons. Learn
from RCA what it takes to get ahead in the ever-expanding field
of communications.
With RCA Institutes home training in Communications Electronics, you set the pace that suits your ability, finances and time.
RCA's liberal Voluntary Tuition Plan is the most economical home
study method, because you pay for lessons only if you order them
... one study group at a time! If you drop out at any time, for any
reason, you do not owe RCA one penny! No other obligations!
Licensed by New York State Education Department. Approved
for Veterans.
Prepares You for an FCC License
RCA INSTITUTES, INC.
Other home study
courses available:
Electronics Fundamentals
Black & White and Color TV
Automation Electronics
Computer Programming
Transistors
r
A Service of Radio Corporation of America
350 West Fourth Street, New York 14, N: Y.
RCA INSTITUTES, INC. Home Study
350 West Fourth Street, N. Y. 14, N. Y.
The Most Trusted Name
in Electronics
1
School, Dept. PF -42
Without obligation, rush me the FREE 64 -page illustrated booklet "Your Career in Electronics" describing your electronic home study training program. No salesman will call.
Age
Name
Address
zone
City
State
CANADIANS-Take advantage of these same RCA courses at no additional cost. No postage, no customs,
no delay. Send coupon to: RCA Victor Company, ltd., 5581 Royalmount Ave., Montreal 9, Quebec.
L..
22
PF
REPORTER/April, 1962
is now available from
Sprague Products Co. or their distributors. The latest 17" by
22" sheet displays five points consumers should consider in
having their TV sets repaired.
Novel Dealer Sales Promotion
Wayne Collins, owner of Lectra Home, El Segundo, Calif.,
recently gave away a Sylvania portable TV, a stereo hi-fi
phonograph, and a radio to customers who came closest to
estimating how long a TV set would run without requiring
service. A Sylvania Model 23C20 placed in his show window
operated a total of 15 months and 15 days-equivalent to six
years of normal playing time-before requiring service.
A Look at the Future
Mr. R. H. (Herb) Bowden,
President of Sencore, Inc., was
guest speaker at the recent 1962
Annual Banquet of the California State Electronics Association. His speech, "The Importance of the Independent Serviceman
Today and Tomorrow," conveyed his conviction
that the future is bright for
servicemen who keep abreast
of new developments in testing
methods, and who practice
sound business principles.
Littelfuse Vice -President Honored
Walter A. Clements, Vice
President-Distributor Division
of Littelfuse, Inc., received the
industry award presented annually by the Electronics Representatives Association for
"Excellence in Sales Management" at the association's recent annual convention. Littelfuse has been a major supplier
of fuses to the service industry
for over 25 years.
New Corporate Name
Stockholders of Electronic Instrument Co., Inc., voted for
approval to change the company name to EICO Electronic
Instrument Co., Inc., at the annual meeting held January 31.
Expanding Market
Mr. Irving I. Schachtel, President of Sonotone Corp.,
recently predicted an increase in the use of sintered -plate,,
nickel -cadmium sealed battery cells. He cited the expanded
usage of these cells in such products as portable communications transceivers, paging devices, cordless electric shavers, etc.
Mr. Schachtel announced that his company manufactured and
distributed a total of one million such batteries during 1961.
Seems like a good time for progressive dealers to look into
the replacement -sales potential of these items.
Guarantee Against Obsolescence
Seco Electronics, Inc., unconditionally guarantees that
their Models 88, 107A, and 350 tube testers will be kept up to
date for receiving-tube testing for a period of one year after
purchase date. Adapter kits or setup data will be furnished at
no cost to owners during the first year.
The "New Look" in Westinghouse Tubes
"There's NEW POWER in Westinghouse Tubes" is the
theme of a dealer profit-sharing program being announced this
month by Westinghouse. Replacement 'receiving and picture
tubes are now undergoing a more rigid quality -control check
than ever before, and will appear in new gold and black cartons. To introduce the new tube program to service dealers,
the cartons are designed with tear -off "Golden Profitabs" which
are redeemable for premium merchandise. The program is
being announced this month in a special "kick-off" ad containing a "Bonus Profitab" worth 100 points.
k)eUJTRANSISTOR RADIO
makes
it Easy
ANALYST
and Profitable to Service all Transistor radios
TRANSISTOR RADIO ANALYST
with Exclusive DYNA-TRACE
Single -Point Probe-and Built-in
Metered Power Supply and VTVM
Complete Transistor Radio
Service Shop in One Instrument
ta0
Signal -Generator, Power Supply,
Milliammeter, VTVM,
Ohmmeter, and Both In -Circuit and
Out -of -Circuit Transistor Tester-
dln0©tJ
id
All in One
Ckek off cincuxts - Pnpoùit
Dtotth&...
i*t nÙtt&l s
Now you can profit from transistor radio
servicing! This amazing new B&K "960"
ANALYST gives you everything in one complete easy-to -use instrument. Makes transistor radio servicing quick and easy. Nothing
else is needed except the transistor radios
themselves waiting to be serviced. Brings
you new customers for service, parts, and
batteries. Makes this new business yours.
EASILY TROUBLE -SHOOT ANY STAGE
BY UNIQUE POINT-TO-POINT SIGNAL INJECTION
SIMPLIFIES IN -CIRCUIT TRANSISTOR TEST
WITH NEW DYNA-TRACE SINGLE -POINT PROBE
The ANALYST gives you a complete signal -generating
source for point-to-point signal injection. Easily enables you
to trouble -shoot any transistor radio-check all circuits
stage -by -stage --isolate and pinpoint the exact trouble in
minutes.
Supplies modulated signals, with adjustable control, to
check r.f., i.f., converter, and detector. Supplies audio signal
to check audio driver and audio output. Provides unmodulated signal to test local oscillator. Provides separate audio
low -impedance output for signal injection into loudspeaker
voice coils to check speaker performance.
Unique single -point probe needs only the one contact to
transistor under test. No longer are three wires required to
connect to emitter, base, and collector. Gives fast, positive
meter indication. Saves time. Makes trouble -shooting simple
and easy.
BUILT-IN METERED POWER SUPPLY FOR EASY SERVICING
Makes it easy to operate radio under test, while you inject
your own signals. Provides from 1 to 12 volts in 1 % volt
steps. Supplies all bias taps that may be required.
Solve Every Service Problem and Profit
with a Modern B&K Service Shop. See Your
B&K Distributor or Write for Catalog AP 18-R
BUILT-IN VTVM
Includes high -input -impedance vacuum -tube voltmeter,
which is so necessary for transistor radio servicing.
TESTS ALL TRANSISTORS OUT -OF-CIRCUIT
Meter has "Good -Bad" scale for both leakage and beta.
Also has direct -reading Beta scale, calibrated 0-150. Assures
quick, accurate test. Also automatically determines whether
transistor is NPN or PNP. Meter is protected against accidental overload and burn -out.
Model 960. Net, $9995
BaK MANUFACTURING CO.
CHICAGO 13, ILL.
1801 W. BELLE PLAINE AVE
Canada: Mlas Rodio Corp., 50 Wingold, Toronto 19, Ont.
Export: Empire Exporters, 277 Broadway, New York 7, U.S.A.
April, 1962
'PE REPORTER
23
1. ANNOUNCER: Why do many TV servicemen buy RCA Victor New Vista Television
for their own homes? Let's visit one ..
.
4.
.
.
.
gives you an amazingly clear, steady
picture.
"I
2. JOHN HALVERSON (Meriden Conn.j:.
that's
work with many kinds of TV sets
why I picked RCA Victor for my home."
.
.
.
Second-RCA Victor has Security Sealed
Circuit Boards. And John knows they're precision -crafted, and far more dependable .
5.
.
7. And third, he prefers
cause it's so reliable.
24
PF REPORTER/April,
1962
RCA Victor TV be-
That's right. I spend
much of my time fixing other people's sets.
When I get home I like to relax!
8. JOHN HALVERSON:
.
This TV
commercial is
telling the story
of RCA VICTOR
John Halverson gives three
reasons: First, RCA Victor with its powerful
New Vista Tuner ..
3. ANNOUNCER:
.
performance to
millions of people
on the hit TV show,
Walt Disney's
"Wonderful World of
Color" on the NBC-TV
With no old-fashioned hand -wiring to come
loose or short-circuit.
network
...
it builds
6.
public awareness
of the role you play
in providing
dependable TV
entertainment.
The Most Trusted
RCA Victor New Vista
Television at your dealer's this week!
9. ANNOUNCER: See
Name in Television
Tmk(s)e
See
Walt Disney's Wonderful World of Color every Sunday, NBC-TV Network.
April, 1962/PF
REPORTER
25
Never say "Tubes --say "Sylvania"!
26
PF
REPORTER/Apra, 1962
delivery!
assures profits!
SILVER SCREEN 85 PICTURE TUBES
Sylvania was a pioneer in the manufacture of commercially produced
picture tubes. That kind of experience builds profit protection into
every 1962 SILVER SCREEN 85-top performance, maximum assurance against callback. And, when you specify Sylvania for that replacement job, you are sure to get delivery ... because SYLVANIA
has the comprehensive line ... SYLVANIA DISTRIBUTORS are
wherever there is TV
Bonded Shield anti -reflection Bonded Shield non -Bonded Shield
single and multiple branded long and short necks metal and glass
envelopes 50° to 114° deflection magnetic and electrostatic focus
ion trap and non -ion trap types rectangular and round faceplates
2.35-v to 6.3-v and 450 -mA to 600 -mA heaters 5" (50°-70°) and 8"
(90°-114°) universal bench -test tubes.
Plus "universal" 17-, 21- and 24 -inch picture tubes!
Plus color TV picture tubes!
!
SYLVANIA RECEIVING TUBES
Color TV... Sylvania continues to prove its capabilities ... in
the production of tubes especially for color TV replacement. Since
your customers are buying "performance"- not technical data-tubes
at SYLVANIA are performance -tested continuously in actual color
TV sets. Go with quality-go with Sylvania tubes for color TV:
...for
6BK4IV2.3A3.6DQ5.6CB5A6AU4GTA6CG7.6AW8.12BY7
6AQ5.6AV5.6EM7.
Black & White TV... Sophisticated manufacturing techniques
and processes have made Sylvania a preferred supplier of tubes for
TV. Developments such as Sarong Cathode and Strap Frame Grid
plus extensive automation in production assure that replacement
tubes are... in every way ...as good as the original.
...for TV Tuners... Sylvania -originated, the 6GK5 brings new advances to the state of the electron tube art. This new tube type, as
manufactured by Sylvania, features Strap Frame Grid constructions
and high Gm, provides high gain and low noise in rf amplifier -service
in TV front -ends. When replacing a 6GK5, specify Sylvania-universally accepted by manufacturers of TV sets. Sylvania 6GK5 also replaces the popular 6FQ5, 6FQ5A and the 6FY5.
...for AM -FM Radio... Whether servicing an AC -DC table radio, a
fine Hi-Fi tuner or one of the latest Multiplex units, make Sylvania
your number one choice. Take, for examples of outstanding quality,
the new 17C9 and 6JK8. Both are Sylvania -originated and provide
superior performance in standard tuner and in multiplex circuitry.
...for Hi-Fi and Phono... One of the pioneers in tubes for audio
amplifier service, Sylvania has led with old faithfuls like the 6L6, 6V6
'and 6AQ5 and the new high-performance Sylvania 6GM5 and Sylvania
7591.Automated production techniques and final test procedures maintain precision, assure high quality. A Sylvania replacement tube is the
best way to make old equipment perform like new again. Electronic
Tubes Division, Sylvania Electric Products Inc., 1740 Broadway,
...for
New York 19, N.
Y.
Sylvania Tubes -available wherever there is TV
!
SYLVANIA^/
SVBS/DIARY
OF
GENERAI
GENERAL TELEPHONE 8 ELECTRONICS
April, 1962/PF REPORTER
27
FOR
TV
STOCK
This list omits over 50 of the rarest
TV tube types, which many shops do not
find it practical to keep in stock. To
simplify the chart as much as possible,
common radio and hi-fi tube types used
in TV combinations are omitted; so are
UHF types. Tubes marked* are primarily used in color sets.
The figures on a gray background suggest a stock of 350 tubes which should
account for over 90% of your replacement needs, and should minimize your
risk of being "caught short" even if you
travel all day without refilling your tube
caddy. However, if you prefer a more
PER
CADDY
1000 STOCK
27
2
12
2
TUBE
TYPE
1B3GT
1G3GT
TUBE
PER
CADDY
TUBE
PER
CADDY
TUBE
TYPE
1000 STOCK
TYPE
1000 STOCK
TYPE
2
5
1J3
3
1K3
1
6
2
2
2
1S2A
1V2*
1X28
28N4
2CW4
1
1
1
1
1
1
1
-
1
1
1
1
1
3
2
2CY5
1
1
2FH5
-
2FS5
4
2
2GK5
3A3
3AL5
3AU6
2
1
1
3
1
1
1
2
3
1
1
1
1
1
3AV6
1
3BC5
5AV8
5AU4
5B8
5BE8
5BK7A
5BR8
5BW8
19
9
2
38Z6
2
2
3CB6
34
3
2
1
3CS6
5
2
1
1
3CY5
2
2
5V3
3DG4
3DK6
2
2
1
1
1
7
2
3DT6
3GK5
3GS8
1
1
1
1
4BC8
2
1
3
2
1
1
1
3
2
1
1
4CB6
1
1
1
1
5X8
5Y3GT
6AC7
6AF3
6AG5
6AG7
6AH4GT
6A H6
6A K5
6AL3
6AL5
2
4
2
4CS6
4
2
6AM8A
6AN8A
4DE6
19
2
6AQ5A
1
4DT6
2
2
1
4ES8
1
1
6AS5
6AS8
2
1
1
1
5
2
59
2
1
2
1
1
1
4EW6
4GS8
5AM8
5AN8
REPORTER/April, 1962
2
6BC8
2
1
3
1
6BE6
1
1
6BF6
1
1
2
24
3
4
1
1
1
-
6AT6
6AT8A
6AU4GTA
6AU6A
1
1
1
5
2
3
2
1
1
6BC8
2
68074
1
1
66R8Á
6BS8
3
2
69
3
2
2
6BU8
6BW8
6BX7GT
6BY6
6BY8
6BZ6
6BZ7
6C4
6CB6A
6CD6GA
2
1
6CF6
2
2
1
32
3
2
1
33
3
6CG7
9
2
6CG8A
6CL6
6CL8A
6
2
2
1
1
1
2
9
6
1
4
6BK5
6BK7B
6BL7GT
6BQ6GTB
1
1
6BK4*
3
1
1
1
2
2
2
3
1
5
6
8
2
2
11
2
1
6BG6GA
6BH8
6BJ8
68N4
6BN6
6BN8
68Q5
2
6484
33
1
PF
1
1
1
1
1
2
3
4BN6
4BQ7A
4BU8
4BZ6
-
1
4AU6
4AV6
1
-
1
6GC5
1
13
1
5J6
5T8
5U4GB
5U8
2
2
2
2
2
3BN6
3BU8
1
3
9
2
2
1
1
2
2
1
1
3
1
5CL8A
5CZ5
5EA8
5EU8
5EW6
5GH8
5GM6
3
-
2
1
6AU8A
6AV5GTA
6ÁV6
6AW8A
6AX4GTB
6BÁ6
68A8Á
1
5CG8
3
1
28
1
5AQ5
5AS4
5AS8
5AT8
output and similar types.
Your specialization in certain makes
of sets.
3. Average age of sets containing a
particular tube type.
Temporary substitution of available
types for rare types, as outlined in the
2.
Howard W. Sams book, Tube Substitution Handbook, Vol. 4, can also help
you reduce stock requirements.
Another way to ease tube -stock headches is to use only the latest -A or -B
versions of various tubes. Types in common use are listed in the chart.
demand for various tubes:
1. Relatively high failure rate of power
CADDY
PER
5
1
limited caddy stock, the other set of
figures (on white background) will help
you decide which types to cull out. These
figures indicate the number of tubes of
each type you could expect to find in a
random sample of 1000 tubes taken from
all TV sets now in service. Where the
usage is well below 1 per 1000, a dash
is shown. To scale down your stock, you
can omit many "dashed" types, and also
reduce quantities of other types. In so
doing, keep in mind three other factors
besides usage rates which influence the
1000 STOCK
-
-
TUBES...
6CM6
6CM7
6CN7
1
1
1
1
1
1
4
1
2
1
3
2
1
10
1
2
1
8
2
5
1
-
1
1
TUBE
TYPE
PER
CQ3
1
1
6CS6
6CS7
6CU5
4
6CU8
6CW4
6CW5
6CX8
6CY5
6CY7
6CZ5
6DB5
6DE4
6DE6
6DE7
6DG6GT
6DK6
6DN7
6DQ6B
6DR7
6DS5
6DT5
6D16
6EA7
6EA8
6EB8
6EH7
6EJ7
6EM5
6EM7
1
1
1
1
1
1
1
11
2
3
2
1
1
1
3
1
1
8
2
12
2
1
1
8
2
1
9
3
3
2
1
1
2
1
1
1
8
2
2
1
1
1
1
1
1
1
1
1
8CG7
1
1
1
2
1
8CS7
12BQEGTB
12BV7
12BY7A
12C/-CU5
12CÁ5
12D4
12DB5
12DQ6B
12DQ7
12DT5
12ED5
12EN6GT
12GC6
12L6GT
12SN7GTA
12W6GT
13DE7
13DR7
13EM7
17AX4GT
17D4Á
17DE4
17DM4
8CX8
8EB8
12B4Á
12BH7A
17DQ6B
17GW6
19AU4GTA
22DE4
1
8EM5
8ET7
8FQ7
8GN8
1
9ÁU7
25AX4GT
25BK5
9BR7
10DE7
10EG7
10EM7
25BQ6GTB
25CD6GB
25DN6
25L6GT
1
1
1
1
2
1
1
8805
1
1
8AW8A
86Á8A
1
12ÁT7
12AU7
12AV5GA
12ÁV7
12AX4GTB
124X7
12BR7
7EY6
1
6FV6
6FV8
1
1
1
2
7
1
2
12AF3
12AZ7A*
7ÁU7
6EU8
6FS5
1
1
6ET7
6FM8
6FQ7
1
2
1
6FG7
2
2
6ES8
1
4
6X84
1
1
2
2
2
-
8
2
1
1
1
5
1
1
1
5
6ER5
-
6GH8
6GK5
6GK6
6GM6
6GN8
6GW6
6GX6
6GY6
6HJ8
6HS8
6J5
6J6
6K6GT
6K11
6S4A
6SL7GT
6SN7GTB
6SQ7
618
6U8A
6V3A
6V6GT
6W6GT
1
1
3
1
2
1
18
1
1
2
2
2
2
6EW6
6EZ5
6FH5
5
1
1
1
6GC5
2
4
4
10HF8
1
1
33
6FW5
1
1
1
TYPE
1
1
-
TUBE
PER
6FY5
1
-
CADDY
1000 STOCK
1
1
6DA4
6DQ5*
19
CADDY
1000 STOCK
1
1
2
2
2
1
What Does F.C.C. Mean To You?
What Can an
Do
F. C. C.
not the general practice.) The first class radiotelephone examination consists of F. C. C. Element IV. It is mostly technical covering advanced radiotelephone theory and basic television theory. This examination covers generally
the same subject matter as the second class examination, but the questions are more difficult
and involve more mathematics.
License
for You?
What do you need in order to achieve greater
success? You need some symbol of achievement
which will prove to others that you have accomplished a specific goal in self improvement. This
is why most schools award diplomas to their
graduates.
Some diplomas are worth a great deal more
than others, and this makes it difficult to be sure
just how valuable a certain diploma will be.
However, in electronics there is a reliable standthe F.C.C. license. Your F.C.C. license
ard
is like a "diploma in electronics" granted by the
U.S. Government. It is recognized as such by
employers. Your F.C.C. license means a great
deal more than an "ordinary diploma."
Which License Qualifies for Which Jobs?
The THIRD CLASS radiotelephone license is
of value primarily in that it qualifies you to take
the second class examination. The scope of
authority Covered by a third class license is
extremely limited.
The SECOND CLASS radiotelephone license
qualifies you to install, maintain, and operate
most all radiotelephone equipment except commercial broadcast station equipment.
The FIRST CLASS radiotelephone license
qualifies you to install, maintain, and operate
every type of radiotelephone equipment (except
amateur, of course) including all radio and television stations in the United States, and in its
Territories and Possessions. This is the highest
class of radiotelephone license available.
...
What are the Different Types
of Operator Licenses?
The F. C. C. grants three different types. (or
groups) of operator licenses-commercial radio-
telePHONE, commercial radioteleGRAPH, and
amateur.
COMMERCIAL RADIOTELEPHONE operator licenses are those required of technicians
and engineers responsible for the proper operation of electronic equipment involved in the
transmission of voice, music, or pictures. For
example, a person who installs or maintains twoway mobile radio systems or radio and television
broadcast equipment must hold
a
How Long Does
radiotele-
first
9
weeks of classes, and your first class
license at the end of 3 additional weeks of
classes. This makes a total of 12 weeks (just a
little less than 3 months) required to cover the
whole course, from "scratch" through first class.
In the EVENING course (3 nights a week)
you should get your second class license at the
end of the 15th week of classes and your first
class license at the end of 5 additional weeks of
classes. This makes a total of less than 5 months
required to cover the whole course, from "scratch"
through first class, in the evening course.
different classes. There are three classes of radiotelephone licenses, as follows:
(1) Third Class Radiotelephone License. No
previous license or on-the-job experience is required to qualify for the examination for this
license. The examination consists of F. C.C. Ele-
and II covering radio laws, F.C.C.
regulations, and basic operating practices.
(2) Second Class Radiotelephone License. No
on-the-job experience is required for this exami-
Why Choose Grantham Training?
The Grantham Communications Electronics
Course is planned primarily to lead to an F.C.C.
license, but it does this by TEACHING electronics. This course can prepare you quickly to
pass F. C. C. examinations because it presents
the necessary principles of electronics in a
simple "easy to grasp' manner. Each new idea
is tied in with familiar ideas. Each new principle
is presented first in simple, everyday language.
Then after you understand the "what and why"
of a certain principle, you are taught the technical language associated with that principle.
You learn more electronics in less time, because
we make the subject easy and interesting.
Is the Grantham Course a "Memory Course"?
In the Grantham correspondence course, the
average beginner should prepare for his second
class radiotelephone license after from 300 to
350 hours of study. This same student should
then prepare for his first class license in approximately 75 additional hours of study.
In the Grantham resident course, the time
normally required to complete the course and
get your license is as follows:
In the DAY course (5 days a week) you should
get your second class license at the end of the
What are the Different Classes of
RadiotelePHONE licenses?
Each type (or group) of license is divided into
I
Take to Prepare
for F. C. C. Exams?
The time required to prepare for FCC examinations naturally varies with the individual, depending on his background and aptitude. Grantham training prepares the student to pass FCC
exams in a minimum of time.
PHONE license. (A knowledge of Morse code is
NOT required to obtain such a license.)
COMMERCIAL RADIOTELEGRAPH operator licenses are those required of the operators
and maintenance men working with communications equipment which involves the use of Morse
code. For example, a radio operator on board a
merchant ship must hold a radioteleGRAPH
license. (The ability to send and receive Morse
is required to obtain such a license.)
AMATEUR operator licenses are those required of radio hams"- people who are radio
hobbyists and experimenters. (A knowledge of
Morse code is necessary to be a "ham".)
ments
it
The Grantham course is designed specifically
to prepare you to pass FCC examinations. All
the instruction is presented with the FCC examinations in mind. In every lesson test and pre examination you are given constant practice in
answering FCC -type questions, presented in the
same manner as the questions you will have to
answer on your FCC examinations.
No doubt you've heard rumors about "memory courses" or "cram courses" offering "all the
exact FCC questions". Ask anyone. who has an
FCC license if the necessary material can be
memorized. Even if you had the exact exam
questions and answers, it would be much more
difficult to memorize this "meaningless" material than to learn to understand the subject.
Choose the school that teaches you to thoroughly
understand-choose Grantham School of Electronics.
Is the Grantham Course Merely a
"Coaching Service"?
Some schools and individuals offer a "coaching service" in FCC license preparation. The
weakness of the "coaching service" method is
that it presumes the student already has a knowledge of technical radio and approaches the
subject on a "question and answer" basis. On
the other hand, the Grantham course "begins at
the beginning" and progresses in logical order
from one point to another. Every subject is
covered simply and in detail. The emphasis is on
making the subject easy to understand. With
each lesson, you receive an FCC -type test so you
can discover daily just which points you do not
understand and clear them up as you go along.
that Grantham Students prepare for F.C. C. examinations in a minimum of time. Here
our recent graduates, the class of license they got, and how long it took them:
License
Weeks
12
1st
James C. Bailey, 217 Behrends Ave., Juneau, Alaska
Tacoma,
Wash.
20
S.
Winnifred,
1st
Edward R. Barber, 907
12
1st
M. A. Dill, Jr., 20 Cherry St., Gardiner, Maine
12
1st
Bernhard G. Fokken, Route 2, Canby, Minn.
22
1st
Thomas J. Hoof, 216 S. Franklin St., Allentown, Pa.
HERE'S PROOF
is a list of a few of
nation. However, the applicant must have
already passed examination Elements I and II.
The second class radiotelephone examination
consists of F. C. C. Element III. It is mostly
technical and covers basic radiotelephone theory
(including electrical calculations), vacuum tubes,
transistors, amplifiers, oscillators, power supplies,
amplitude modulation, frequency modulation,
measuring instruments, transmitters, receivers,
antennas and transmission lines, etc.
(3) First Class Radiotelephone License. No
on-the-job experience is required to qualify for
this examirí.ation. However, the applicant must
have already passed examination Elements I, II,
and III. (If the applicant wishes, he may take
all four elements at the same sitting, but this is
1st
1st
1st
Clyde C. Morse, 7505 Sharronlee Dr., Mentor, Ohio
Louis W. Pavek, 838 Page St., Berkeley 10, Calif.
Wayne Winsauer,' 2009 B St., Bellingham, Wash.
12
16
12
OUR GUARANTEE: If you should fail the F.C.C. exam after finishing our course, we guarantee to
give you additional training at NO ADDITIONAL COST. Read details in our free booklet.
Accredited by the National Home Study Council
For further details concerning F.C.C. licenses and our training, send for our FREE booklet,
"Careers in Electronics". Clip the coupon below and mail it to the School nearest you.
MAIL TO SCHOOL NEAREST YOU
Get your First Class Commercial
by
F.
C.C. License Quickly
(Mail in envelope or paste on postal card)
training at
To: GRANTHAM
1505 N. Western
GRANTHAM
Los Angeles
(Phone: HO 7-7727)
408 Marion Street
Seattle 4, Wash.
(Phone: MA 2-7227)
3123 Gillham Road
Kansas City 9, Mo.
(Phone:
JE
1-6320)
Seattle
'
ELECTRONICS
3123 Gillham Rd.
Kansas City
'
821.19th, NW
Washington
Please send me your free booklet telling how can get my commercial F.C.C. license quickly. understand there is no obligation
and no salesman will call.
29-D
I
SCHOOL OF ELECTRONICS
1505 N. Western Ave.
Los Angeles 27, Calif.
'
SCHOOL OF
408 Marion
I
821.19th Street, N.W.
Washington 6, D.
(Phone:
MAIL COUPON NOW-NO SALESMAN WILL
ST
Age
Name
C.
Address
3.3614)
CALL
City
I
I.
am interested in:
State
D Home Study, D Resident Classes
April, 1962/PF
REPORTER
29
LLL1
RCA COLOR PARTS
AND DISPLAY RACK
STOCK No. 11A1014
Convenient
Compact
Because of the ideal size
of this rack, it lends itself
very well to mounting on
the wall or on the service
work bench.
126 ESSENTIAL COLOR
PARTS FOR SERVICING
RCA COLOR CHASSIS
TYPES CTC 10 & CTC 11
complete color service
center.
A
SEE YOUR
RCA DISTRIBUTOR NOW!
PARTS &
ACCESSORIES
L
for any serviceman now servicing or
Make
planning to service Color TV receivers
man
two
a one man service call out of a costly
Eliminate possibility of
cabinet pulling job
damage to the customer s set when transportEliminate the
ing to and from his home
need to reconverge the customer's set when
Professional Apthe chassis is returnec
pearance-Finish matches that of RCA. Test
Partial Assembly-Safety glass
Equipment
Comand kine mask assembled at factory
ponents Kit furnished with Test Jig includes
A must
all necessary components, hardware and Instructions for installation of an RCA Tri -Color
Kinescope
Convergence control panel supplied provides dynamic as well as static convergence for the CTC-10 a nd CTC-11 chassis
Instructions included w th test jig provides
data for utilization with CTC-4, 5, 7 and 9
chassis and lists extension cables required
CONTENTS OF
PARTS KIT !APPLIED WITH TEST JIG
Description
Cushion-Plastic, for kinescope mounting
Shield-Plastic, for anode contact
Lead-Anode lead
Resistor-Fixed Comp. 56K± 10%, 2W_
Spring-For anode resistor
Yoke-Deflection yoke
Convergence assembly
Ring-Purity magnet
Magnet-Blue beam lateral
Clamp-For convergence cable
Screw-For mounting convergence assem.
Lead-Ground lead
Clip-For ground
Tool
kaddy
Quantity
2
1
1
1
105033
105034
-
105539
1
105028
1
109457
1
-
1
79604
1
103172
1
3
1
lead
Stock No.
1
-
1
act now for
the color season
see your RCA distributor for details
RCA
pads
(C'
(f('('('.S.SOI'ie.S/C(llllW
RCA The Most Trusted Name in Color Television
RADIO CORPORATION OF AMERICA
ell, l/. J.
S1witTagk
nal
by Allan
Kinckiner
F.
RASTERS
Fig. 1. Scallop (vola jacobaea) is a bivalve. Habitat: Shallow sea bottoms.
Fig. 3. Not a luminous funnel cloud,
but struggling attempt at TV sweep.
Fig. 5. Cup -shaped raster was sign of
abnormal loading on sweep circuits.
Most visual symptoms of TV
trouble are familiar to servicemen
through repeated encounters, and
are also well catalogued in technical books and magazines (see Chart
I). Thus, their most common causes
are well established, and experienced servicemen know what troubleshooting strategy to employ for
quickest lesults.
But every now and then, some
unusual defect, a peculiar combination of troubles, or an interaction
between circuits, will produce a
symptom the average technician has
never seen before. He may be baffled, with scarcely any idea of where
to begin troubleshooting, unless he
is able to reason out the possible
causes of a set's oddball behavior.
The following actual cases will give
some idea of how to proceed when
a freak raster makes its appearance.
I had never before seen a raster affected as severely as this one, I had
seen misshapen rasters in other sets
of this same series
and they had
all been due to a defective boost capacitor (C4 in Fig. 4). The U3's
use of an unusually large electrolytic
unit for this function may have
something to do with the relatively
frequent failures, as well as the odd
symptoms observed. In the present
case, a scope check of C4 proved
beyond doubt it was open, and installation of a replacement resulted
in a normally -deflected raster of acceptable brightness.
In Fig. 3, as well as in Fig. 1,
TO HV
TO
REGT
DAMPER
FROM HORIZ
OUTPUT
T
emit
3000V
100
68
mmf
3000V
mmt
BOOST
460v
HORIZ
YOKE
Fig. 2. Faulty components in yoke cir-
cuit caused
32
PF
a
The dim raster on a Hallicrafters
Chassis C1850D resembled, more
than anything else, a picture that
might be found in the crustacean
section of a natural -history encyclopedia. Because of its keystone
shape, I first suspected a yoke defect; but resistance and inductance
checking gave that item an AOK.
So, I removed the cage cover to
look at the flyback, which I considered the next most probable offender. The first thing I noticed was
that R82 (Fig. 2), mounted on the
flyback, was running hot. On checking, I found that it measured half
its original resistance. Replacing
this part did not correct the raster
shape, although it did make the
raster somewhat brighter. A closer
study of the circuit suggested a defective C78. When I replaced this
capacitor, the raster resumed its
full size and normal shape. A capacitance check revealed that C78
was practically open.
-
FROM HORIZ
OUTPUT
TO HV
keystone -shaped raster.
REPORTER/April, 1962
Tornado
Fig. 3, which looks somewhat like
a Kansas twister, was the very dim
pattern found on the screen of a
General Electric Chassis U3. While
TO
REGT
2
DAMPER
3
TO YOKE
4700n
3000V
6
Sea Shell
WIDTH SW
620V
BOOST
40
mfU
280V
SOURCE
Fig. 4. Extra -large boost capacitor C4
had
practically
ceased
functioning.
...AND
the light on the screen was so feeble
as to be barely perceptible under
normal room lighting. This dimness
was a by-product of the inefficient
flyback -circuit operation, and was
automatically corrected when the
primary trouble was cured.
THEIR CAUSES!
Chart I-Recent
PF
Articles on Common Visual Symptoms
REPORTER
ARTICLE AND ISSUE
USUAL CAUSES
CONDITION
AFFECTS RASTER WITH OR WITHOUT PICTURE
No high voltage
Blank screen
burned out or biased to
cutoff
CRT
Cup o' Trouble
The cup-shaped raster shown in
Fig. 5 was photographed from the
screen of a Zenith Chassis 16D21.
Soon after I fired up this set on the
bench, I noted that R59 (Fig. 6)
was running excessively hot. This
reinforced my initial suspicion that a
faulty filter capacitor was causing
the raster distortion, although I
wasn't immediately sure which filter
was to blame. Scoping the power supply circuit, I found horizontal
flyback pulses on the 270 -volt B+
line. Obviously, C B was not properly filtering the plate voltage of the
damper tube. Replacing Cl restored
a full raster, and I then concerned
myself with determining why R59
had been overheating. DC voltage
checks at both ends of the resistor
had indicated no reason why it
should run hot. However, since the
series combination of R59 and C2A
had presented the lowest -impedance
path to ground for the damper -plate
pulses, the strength of the pulses developed across R59 was undoubtedly great enough to account for its
feverish temperature.
Although the resistance of R59
had not shifted too far from its original value, I nonetheless replaced it,
because a resistor subjected to excessive current is likely to become
"noisy" at a later date and result
in some pretty hard -to -pin -down
troubles.
Raster
reduced to thin horizonta line
Raster rectangular, but not
high enough or distorted vertically
Failure of vertical sweep circuit or yoke
Weak or nonlinear vertical
sweep
Vertical Sweep Troubleshooting
from A to Z Jan 62
Operation Vertical Jan -Feb 61
Raster
rectangular, but not
wide enough or distorted horizontally
Weak or nonlinear horizontal
sweep
That's the Way the Horizontal
Sweeps May 60
Raster not rectangular
Defect in yoke or associated
component
Insufficient high voltage
Pinpointing Yoke and
Troubles May 60
Misadjusted or faulty focusing
Selecting a
May 61
Poor focus,
with blooming
Poor locus of scanning
no blooming
lines;
system
Regeneration
Background shading
in raster
or bars
CRT
Flyback
Replacement
Pinpointing Yoke and Flyback
Troubles May 60
Regeneration in Picture - Signal
Circuits Dec 60
High -voltage arcing
Irregu ar flashing
1
Please turn to page 101
Restoring Horizontal Sweep
Feb 62
Where'd the Boost Go? Aug 61
Pinpointing Yoke and Flyback
Troubles May 61
Have HV-No Raster May 60
Hum or ripple entering picture
circuits
Track Down That Visible
Hum
Sep 61
AFFECTS PICTURE ONLY
RF -IF -video
Raster, but no picture
Broken
Weak, snowy picture
Low gain in tuner
signal path
Have
TV
Raster-No
Pix Jan 61
Tuners-Repair
or Replace?
Sep 61
Weak
,icture-no
snow
High contrast, but gray -scale
distortion
Scoping Video and
Troubles Jan 60
Insufficient AGC bias
Causes and Cures for Negative
Picture Oct 60
Servicing the Big Loop Jul 60
RF -IF -video
defect
Scanning lines sharp, but picture smeared or blurred
Misaligned or defective
video section
Picture tearing and/or rolling
Loss of
(flipping)
Bars or lines in picture
Vertical
Low IF or video gain
Excessive AGC bias
RF
RF -IF-
Painless -TV Alignment Oct 61
Checking Up on Video Amplifiers Jan 62
Pix-Must
Steady
sync; defect in sync,
sweep, video, AGC, IF, or
Wanted:
tuner
Servicing Sync and Sound
Sep 60
Tough -Dog Sync Troubles
Feb -Apr 60
interference
Eliminating TVI Jan 62
Be
Feb 61
Cooies of all back numbers listed in this chart, except January and May 1960, are
sti available. To obtain any of these issues, use the convenient coupon on page 104.
I
April, 1962/PF
REPORTER
33
A LOOK
LET'S HAVE
New "top -end" circuits are further
expanding the limits of TV fringe areas.
The advent of high -frequency
transistors and stable, ultra -high gain RF tubes has brought about
a resurgence of interest in TV preamplifiers, especially among consumers. Of course, preamps have
long been available, but newer units
can claim much better performance
characteristics than the early -model
"boosters."
The original boosters sat on top
of the TV receiver and acted as an
extra stage of RF amplification, increasing the sensitivity of the setnot only to television signals, but to
line noises as well. The next logical step was to place the preamp
nearer to the antenna. By locating
the unit closer to the signal -pickup
point, the line loss between the antenna and preamp is reduced. Thus,
noise generated within the preamp,
as well as that picked up by the antenna and line, have less of a deteriorating effect on the signal. Mast mounted preamps are still being
used today with a great deal of success.
The small physical size and low
power requirements of transistorized
units made it possible to locate the
AVAILABLE MODELS
MANUFACTURER
by Jim Galloway
. .
preamp right at the antenna terminals. This almost completely eliminated the transmission line between
the antenna and preamp, simplifying the problem of achieving a good
impedance match and thus a better
transfer of signal energy. Recently,
manufacturers have been selling antennas and preamps as single units
calling them, quite logically,
"transistorized antennas."
-
Characteristics
-
-
There are two important specifications
gain and noise figure
which can be used to indicate the
performance of any preamplifier.
When you buy a preamp, it is a
good idea to know how to interpret
these terms, so that you will be in a
better position to select the unit
which will fulfill the needs of a
specific application.
Gain
Most gain figures are given in
decibels; however, a single gain
figure is not adequate to describe the
over-all performance of a preamp.
Since the bandpass of the unit must
be of sufficient width to amplify at
ANTENNA AND MAST -MOUNTED PREAMPS AND ELECTRONIC ANTENNAS
OF
MODEL
.
ITRADEDESCRI
°
NAME
AB -2
I
PTION
Mast -Mounted Amp
ED
TYPEAAN CE
LIST PRICE
Tube
3000
AB -4
Signal Master
Mast -Mounted Amp
Xstr
3000
$29.95
CHANNEL-MASTER
0020
Jetron
Antenna-MpountedAm
Xstr
300e
$44.95
FINNEY
T-AMB
Nova-Tron
AntennalMaounted
Xstr
3000
$29.95
APM-101
Powermate
Antenna-Moounted
Am
Xstr
300n
OSA -132
De-Snower
Mast -Mounted Amp
Tube
75 or
DSA-202
De-Snower
pn
2Oóá
$89.95
Transis tenna
Mast-Mounted Amp
Antenna -Mounted
Tube
TNT -100
Xstr
300n
$34.95
TNT-103AC
Transis- tenna
Xstr
300n
$36.95
Xstr
Tenna Boost
Electronic Antenna
Antenna -Mounted
Xstr
3508á 7&80-$107.20
300n
$34.95
Powertron
Electronic Antenna
Xstr
75 or
74.95-$104.95
3000
BLONDER -TONGUE
JERROLD
JFD
Electra
TACO
WINEGARD
MA -300
AntennaAmp
Mounted
SEVERAL MODELS AVAILABLE
34
PF
REPORTER/April,
1962
$53.95
$39.95
$119.50
least all the VHF television signals
(and perhaps FM signals as well),
gain is not usually the same across
the entire amplifier range. Therefore, at least two gain figures are
often given-one for the high range
(Channels 7 through 13), and another for the low range (Channels
2 through 6 plus the FM band).
Each of these figures usually represents the average gain over the particular ranges they cover. Many
manufacturers include gain curves in
their specifications; these are helpful in determining the relative gain
of the unit for each particular channel.
It is not unusual for the purchaser
of a preamp to be swayed into selecting a unit with the highest gain
characteristics, consistent with a
price considered reasonable for the
application. As mentioned above,
however, noise is also a factor in
determining the suitability of a
given preamplifier for a specific requirement.
Noise Figure
In considering the use of a preamplifier, we must realize that its
sole purpose is to increase desired
signals to a usable level, and this
level must be sufficient to overcome
the noise generated in the front-end
circuits of the receiver. In other
words, depending on the receiver
used, a certain amount of signal
must be delivered to its antenna
terminals to provide satisfactory performance. Since the preamplifier itself is basically an "addition" to the
front-end of the receiver, and contains RF circuits which also generate noise, its noise figure must be
considered in conjunction with its
gain figure.
For example, suppose the gain
figure for one preamplifier is specified as 10 db, and its noise figure
Fig. 1. Blonder -Tongue Model AB -4 pre amp and available power supplies.
Its performance would be
slightly better than that of a unit
having the same gain but a higher
noise figure-assuming, of course,
that the figures were derived in exactly the same way.
In order to better understand
what noise figure means, it is necessary to know a little more about the
type of noise referred to in this expression. In a television receiver, the
main noise sources are the converter and RF amplifier circuits,
which generate what is commonly
referred to as thermal agitation.
Some of this noise is generated
within the tubes or transistors, or in
the associated circuit resistors.
Electrons inside a resistor are
continually in motion, at velocities
determined by the temperature of
the component. Because of the vast
number of electrons involved, more
of them will be moving toward one
end of the component than the
other, and some small voltage will
be developed between the resistor
terminals. This voltage is comprised
of many frequencies; when amplified, it can be heard as a hiss in the
loudspeaker, or seen as "snow" in
the picture. Thermal noise increases
with temperature, because heat increases the rapidity of electron
movement.
A somewhat similar activity takes
place inside a tube or transistor.
is 5 db.
Within a tube, a phenomenon
known as "shot effect" introduces
a considerable amount of noise.
Modern tube design has reduced this
internal agitation to a very small
amount, but it is still a prime source
of circuit noise. Some very low -noise
transistors have been produced as
a result of recent progress in
semiconductor technology, but the
noise produced within transistors is
still fairly substantial. These noise
sources must be taken into consideration in the design and rating of
antenna preamplifiers.
The amount of noise generated by
the circuits of a unit is used in determining the noise figure. There
are several ways of deriving this
2. Blonder - Tongue Model AB -2
tube -type preamp and power supply.
Fig.
specification, and therefore some
variation results, depending on the
methods used for measurement and
calculation. One way is to measure
the actual noise output and divide
it by a low noise -level figure conPlease turn to page 96
L5
ß®
0
T
mmf
330 0
Ii1000mmt
®
R4
i00
25 mtó
10V
IS
mml
®-(i000
wit
1000-
6800
mmi
TWINIIAD
FROM
AB -4
2
33 mmt
0
ct
1ÓÓ0
-"D"
4
DELLS
6
mmt
4th
r
ró11 68n
SET
0I00
SET
=
1st SET
J
680
2nd
mmt
3
2
8
68 0
3rd
VOLTS
SET
680K
ó®
0
ALL TERMINAL PAIRS ARE
Fig. 3. Schematic of Blonder -Tongue Model AB -4
FULL OUTPUT
I FOR SINGLE SETT
300 0
preamplifier and supply.
April, 1962/PF
REPORTER
35
AUTOMATIC
In
many '62 TV
sets, cadmium
sulfide cells are a
new factor in video
troubleshooting
little light at all, as some viewers
prefer), it is necessary to change the
controls again. To relieve this
"drudgery," some set manufacturers
are including automatic controls
which compensate for changes in
room -lighting levels. Some of these
circuits alter the brightness, and
some the contrast, but most circuits
vary them both. Whatever the method, their common function is to relieve the viewer of the need for
changing the manual controls himself.
As every good technician knows,
the basic method of controlling CRT
brightness is by adjusting the grid cathode bias voltage. Brightness can
be reduced by making the cathode
more positive, or by causing the grid
to become more negative (less positive). Either method reduces the
intensity of the electron beam striking the CRT phosphor, with a re -
FROM
sulting decrease in image brightness.
If some manner of controlling this
bias by a light -sensing device is introduced, the brightness can be altered automatically in accordance
with the ambient light in the viewing
area.
The simplified diagram in Fig. 1
shows one way this can be done.
Voltage divider R2 -R3 -R4 determines the amount of positive voltage applied to the cathode of the
CRT. If the slider of brightness control R2 is moved toward R3, less
voltage is dropped across R2, and
more voltage is present at the junction of R3 and R4 (point A). R1
applies this voltage to the cathode
of the CRT, reducing the beam intensity.
If divider resistor R4 is paralleled by another resistor
R5
which is sensitive to changes in light,
the voltage at point A becomes
greater or lesser according to the
amount of light striking R5. This
causes the CRT beam current to be
automatically changed. If the resistance of R5 decreases as more light
strikes it, the bias voltage at the
CRT cathode becomes less; as a result, the CRT image becomes
brighter, overcoming the glare of
- -
()VIDEO
VIDEO
OUTPUT
.
.
by Forest H. Belt
CONTROL:
For years, television viewers have
had to adjust brightness and contrast levels to compensate for room
lighting. On bright, sunny days, a
higher brightness and video level is
required from the TV than on a
dark, dull day, or even when the
curtains are closed. At night, with
incandescent lighting (or with very
.
room light.
A change in CRT brightness
should be accompanied by a corresponding change in the video level;
otherwise, the gray -scale balance of
the picture will be upset, resulting
in a "washed-out" picture. A method of increasing the video automatically is shown in Fig. 2. Video
gain in this circuit is normally controlled by R4, which is part of the
video -amplifier plate load. Automatic contrast compensation is accomplished when series resistor R3
changes in value, causing more or
less video signal to develop across
R4.
If an increase in room lighting
causes the resistance of R3 to decrease, the signal voltage at point A
increases because of divider action
in R3 -R4. Note that Cl keeps the
lower end of R4 at signal ground.
The increase in video signal at point
A causes a greater signal voltage to
be fed through C2 to the CRT.
Thus, light-sensitive element R3 can
cause an increase in contrast which
compensates for increased room
lighting; if the room becomes darker, R3 increases in value and the
contrast is reduced accordingly.
The resistive device which is re -
AMP
O
LIGHT-SENSITIVE
RESISTOR
i
R5
(-4,-
LIGHT-SENSITIVE
RESISTOR
TO CRT
CONTRAST
B+
B#
Fig. 1. A light-sensitive resistance con-
trols
36
bias
PF
and
brightness
REPORTER/April, 1962
of
CRT.
Fig. 2.
A method of contrast control.
Fig. 3. Cadmium sulfide photoconduc-
for
changes
resistance
with
light.
sponsible for this unusual action is
known as a cadmium sulfide photosee Fig. 3. A thin
conductor cell
layer of cadmium sulfide, when deposited as shown in the photo, reduces its resistance in the presence
of light. This is a negative characteristic, which means that more light
causes less resistance. The dark resistance (no light) of these cells can
range from 100K ohms to several
megohms, depending on the design.
Under high -intensity light, their resistance ranges from 200 ohms to as
much as 10K ohms. Those used in
TV automatic brightness and contrast circuits usually have a dark resistance of a few megohms and a
bright resistance of 200 or 300
ohms.
-
A Practical Circuit
The Magnalux circuit used in
Magnavox receivers is shown in Fig.
4. The key element in the circuit is
the light-sensitive cadmium sulfide
cell R12. The element has a dark
resistance of nearly 5 megohms. In
semi -darkened surroundings, its resistance falls to around 50K ohms,
and in very bright light the resistance is about 300 ohms. Thus, under normal circumstances, the cell
resistance will vary from 50K to 300
ohms, according to the amount of
light present.
Manual control of CRT brightness is accomplished by R14 in Fig.
4. This brightness control varies the
amount of voltage applied to the
CRT grid. Divider R6 -R7 holds the
cathode at a fixed DC potential. The
video level is set by contrast control
R4, which adjusts the cathode bias
of V1, the video output tube.
In a semi -darkened room, such
as a living room at night with only
one lamp burning, the resistance of
R12 is approximately 50K ohms.
In this condition, it exerts very little
influence on the divider networks,
which consist of R 10-R 11-R 12,
CRT voltage divider R13 -R14, and
screen voltage divider R8 -R9. As increased illumination (more lamps,
or daylight) lowers the resistance
of the cell, the total value of the
parallel combination R10 -R11 -R12
decreases, causing more voltage
from the 280 -volt line to be available at point A. R13 and R14 apply this voltage increase (point B)
to the grid of the CRT through R15.
280V
150K
OUTPUT.
12BY7A
VIDEO
13
FROM
VIDEO
H
O
180K
O
DER
0
Ow...
300K
33000
200K
BRIGHTNESS
68i
mint
220K
18
330K
68K
u
FOCUS
Os.lplllp
600V 280V
LIGHT-SENSITIVE
39000
RESISTOR
ó
Later Models:
280V
Symbol
Changed To
C5
added
R4
R9
CONTRAST
RIO
R13
6000
815
VI
K
2170
315ÓK
removed
6E88
Fig. 4. Magnavox automatic brightness circuit has no switch for disabling.
anode voltage and the grid bias of
the CRT. R14B chooses the grid
bias, and R14A acts in conjunction
with R15 to keep the first -anode voltage fixed with respect to the grid.
This improves the operation of the
CRT at any brightness level which
may be manually selected by R14,
the brightness control.
Contrast control R5 is effectively
in parallel with the plate load of V1,
the video output tube, since ABC
switch S1 bypasses R4 and R5
see Fig. 6. R7 determines the minimum contrast level obtainable with
R6. C5 couples the video signal
to the cathode of the CRT across
resistor R12. R8, R10, R11, and
R12 (Fig. 5) form a voltage divider which maintains the DC level
at the cathode of the CRT, improving the video presentation.
When ABC switch S1 is placed in
the on position, as it is shown in
Fig. 5, the short across cadmium
sulfide cell R4 is removed by one set
of contacts, and another set changes
The beam current in the CRT becomes more intense, and the raster
brightens.
At the same time, R8 and R9 apply the voltage increase (point A)
to the screen (point C) of video
amplifier V1, raising its gain and
increasing the contrast. This greater
video signal is applied to the cathode of the CRT and the contrast
change corresponds with the increased brightness.
-
A Complex Circuit
An automatic brightness circuit
called Magic Eye is used in certain
RCA chassis. A simplified schematic
of this arrangement is shown in Fig.
5. This circuit is primarily a complex voltage divider arrangement,
and Fig. 5 is drawn in such a way
as to aid in tracing the DC and signal paths.
First, let's analyze the circuit with
the automatic brightness switch in
the off position. The voltage divider
consisting of R13, R15, and both
sections of R14 controls the firstVIDEO OUTPUT
vt
SI
6HF8
Please turn to page 42
AUTO-BR IG HTNESS
SWITCH
150K
r
120K
OFF
150K
OFF
FOCUS
.22
270K
O56K
47 mor
BRIGHTNESS
87
18K
O
27K
13
180K
B
75K
270V
Fig. 5.
Simplified layout of Magic -Eye circuits clarifies explanations.
April, 1962/PF REPORTER
37
AUDIO FACTS by C. THOMAS
* HOWELL
Li
CO.'S
PE4
The Howell Company of El Paso, Texas, established in 1950 as a general TV-radio repair shop,
began easing away from TV into hi-fi about 1954. By
1957, when they dropped TV entirely, they'd already
spent a full year on their present job-selling and
servicing tape recorders.
"By the nature of the tape -recorder, business, we
also include phonograph sales and service," says
owner Tom Howell. "We service 6,000 phonos a year.
But tape is our main business."
Howell's sales run right at $100,000 a year. The
service department, with five full-time technicians,
grosses $50,000 a year. Parts inventory averages between $6000 and $7500, including parts for all popular
foreign makes.
When a service job hits the bench, the technician
studies the complaint carefully. If he thinks the job
is going to cost the customer in excess of $12.50, he
drops it and telephones the customer. Some instruct
him to go ahead; others consider trading in the equipment, and ask him to hold off until they can come to
Howell's. Names in this second group are relayed to
Fred Willems, sales manager, who handles the situation personally after being briefed by the technician.
"We trade for anything electronic," says Willems.
"If we can gross $10 on a trade-in, we are satisfied.
We prefer to move our stock fast, rather than to hold
out for a larger profit margin."
Most equipment is purchased on time payments,
with credit handled by finance companies. Delinquent
accounts are few, and repossessions are almost unknown.
Service Routines
Recorders and changers being bench-serviced are
stripped down for a complete cleaning and lubrication, if they are more than about a year old. Dry
motor bearings, and deteriorated drive belts or idler
wheels-both sources of objectionable noise-are often
found.
"We always clean and demagnetize the tape heads
as a free service, even if the repair is only a tube
replacement," says W. D. "Scotty" Scott, service
manager. "On professional or semiprofessional units,
the bench serviceman also checks the bias on the
record head and its azimuth alignment."
Custom Sound Recording
A little over a year ago, Howell's ventured into the
commercial recording field, seeing unlimited possi-
Customer listens in sales room
while Tom Howell plays tape
4(1
recording of daughter's part in
school performance.
Bench technicians handle a recording session at a local high
school.
38
PF
REPORTER/April, 1962
Several bench technicians are
kept busy servicing recorders
and phonographs.
Simple AM
tuner-just
an
RF
tank circuit and crystal detector supplies amplifier -test
-
r>
signal.
bilities for making contacts to boost the sale of equipment and increase the service department's volume"
besides picking up the additional profit from the
sale of tapes and platters as we go along," says
Howell.
...
The company is franchised by Century Records, a
West Coast disc -pressing firm, which works from
master tapes recorded by local high school bands,
college bands and orchestras, choral groups at both
schools and churches, and other instrumental and
vocal groups. The musical programs are recorded during a performance, as a rule-rarely at a rehearsal.
Whenever possible, Howell's has a prominent display
of music systems, tapes, and records at the entrance
to the auditorium, with Tom alongside to answer all
questions.
Requests to play back the recordings immediately
after the performance are squelched, since both the
participants and the recording technicians are usually
ready to call it a day. Tom explains, "We return at a
prearranged time, when the performers are convened,
and play back the tape via one of our professional or
semiprofessional units." Later, performers or parents
41
often come back to Howell's to hear the recordings
again and buy copies on discs or tape.
Tom says, "It's seldom we gross less than $300 on
a session." At the high school in Deming, New Mexico
(population 5,000), he sold $880 worth of tapes and
platters on one job. A session with two churches at
Albuquerque brought in $1210. Another time, he
worked out a program with Austin High School in El
Paso to sell a thousand records at $1 each, with $550
going to the school for a fund-raising project. This
record contained highlights of the school year, as
taped by a journalism student. There were school
yells, famous sayings of class members, a few bars of
a popular song rendered by "the girl most unlikely to
become a vocalist," the school orchestra tuning up,
the band making a few off-key sounds, and a few
characteristic remarks of faculty members. This was
all edited down to 12 minutes with Howell's help, put
on both sides of a 45 -rpm disc by Century, and included with the school's annual.
"It was a lot of fun, and it meant $450 for us,"
says Tom Howell. "There's no end to the possibilities
tape offers a dealer."
Stereo speakers like these are
being installed over all bench
positions.
Foreign brands account for o
considerable portion of Howell's tape -recorder service business.
April, 1962/
PF
REPORTER
39
Blueprints for
Service Benches
pa,! /
.
w
a
00
eo
azz=z10
00
00
m
You can build this one-man bench with a minimum
of effort and materials. It has a rugged surface that can
take a lot of punishment, and it is designed to let you
work with maximum efficiency. Either screws or nails
can be used to assemble the work. Screws provide a
somewhat stronger construction, but involve considerably more work. On the other hand, nails will do the
job adequately if driven in the proper pattern (see
corner-detail drawing on next page).
A row of AC outlets along the back of the shelf is
definitely recommended, so that the line cords of the
test instruments can be kept out of the way. You may
prefer to install additional outlets along the front edge
for powering sets and soldering irons. In this case, the
top covering should be extended about two inches beyond
the front edge of the bench frame, to "roof over" the
outlets so that the plugs will not be inadvertently pulled.
The shelf near the floor can be as wide as desired,
depending on whether you have a greater need for leg
room or fo rstorage space. This shelf should be fastened
securely to the end braces, because it is an integral part
of the bracing structure of the bench.
Automatic Brightness Control
NOW -FIRST TIME EVER!
(Continued from
p(l1
37)
The exact or equivalent
replacement for nearly every
record player made since 1930
.
MASTER CARTRIDGE
SUBSTITUTION
GUIDEBOOK
by Jack Strong
For everyone who services or sells record players this
guidebook will pay for itself over and over again by:
1. saving time in locating the right replacement
Fig. 6. Video circuit when Si is
off.
the voltage divider from R8 through
R12 to place less resistive isolation
quickly.
between the cell and the CRT cath2. saving money by cutting down on the number of
ode.
Now the light-sensitive cell can
cartridges you need to stock.
affect the cathode voltage on the
This cross reference guide book will help you locate the
exact replacement or equivalent cartridge (mono or
stereo) for virtually every record player made since CRT, as you will presently see.
1930. Even the old record players can be serviced
In Fig. 7, the resistive networks
through the use of universal replacement types. The
book consists of two parts. In Part I, substantially of Fig. 5 have been combined and
all cartridges made since 1930 are listed, first by
simplified to show how they affect
numerical order, and then in alphabetical order.
This listing also shows one or more equivalent carthe CRT cathode when the autotridge types and its manufacturer. Part II, lists
matic brightness circuits are in op(60) record player manufacturers, and the model
numbers of their players, and the part number of eration. The B+ supply voltage is
the original cartridge used. #288, $2.00.
dropped across the R8 -R9 resistance, and then applied to a series TUBE CADDY -TUBE
parallel arrangement. One parallel
SUBSTITUTION GUIDEBOOK
leg consists of the cadmium sulfide
NEW 1962 EDITION NOW AVAILABLE
cell R4 and the plate resistance of
V 1; the other is made up of R11
(Direct Receiving Tube Substitutions Only ... plus
added new feature -1300 direct CRT substitutions)
and R12. The CRT cathode is conThis direct substitution guide, designed to be
nected directly to the junction of
carried in the tube caddy, contains only direct
receiving tube substitutionswhich can be made
R11 and R12.
without modification of the wiring.
This guidebook willThe operation of this brightness save you time
control circuit is relatively simple.
eliminate carrying needless tube types
enable you to select the best substitution
When light strikes the element of
minimize sales losses because you don't have
the right tube
cell R4, the resistance drops in proIt will pay for itself on the first service call!
portion to the amount of light. This
It contains substitutions for:
Receiving
tubes
Ruggedized tubes
lowers the resistance of the entire
European -toAmerican tubes
American -to -European
tubes
parallel network, causing the voltCathode -Ray Picture tubes.
Cat. #299 ... still only 90e
age at point A to diminish. ConseCAUTION-You can't afford to be without this bookl
quently, the voltage at point B (and
HOW TO AVOID LAWSUITS IN TV -RADIO -APPLIANCE
SALES & SERVICE by Leo Parker.
. A valuable
the CRT cathode) decreases, makmanual for the technician ...'' -ELECTRONICS WORLD.
When can a serviceman collect for repairs?
ing the cathode less positive and inWhen is a service guarantee enforceable?
When
can a serviceman demand cash payment?
When
creasing
the CRT beam current.
does a lien protect a serviceman?
How can a
knowledge of contract law earn profits?
How
Thus,
a
change
in light on the cell
valid are written contracts?
What are the insurance laws?
These are just a few of the vital quescauses
a corresponding change in
tions that are answered in this book written by an
experienced lawyer. It covers many situations that
CRT brightness.
you may face if you sell equipment, enter a home to
The circuit of Fig. 5 exerts two
service it or receive equipment for servicing in your
shop. #283, $1.00.
forms
of control over the contrast.
You con depend upon any of the direct substitutions in
INTERNATIONAL TRANSISTOR SUBSTITUTION GUIDEFig. 8A shows how the cadmium
BOOK by Keats A. Pullen, Jr. Eng. D. (Scientific
sulfide cell operates with the conStaff, Ballistics Research tabs., Aberdeen Proving
Grounds) direct substitutions only "possible subtrast control to alter the video -sigstitutions deemed doubtful", that is they work only
in some cases, were omitted
thus, substitution
nal level. When light is falling on
guide Is a 'safe' guide."
INDUSTRIAL ELECTRONIC
ENGINEERING AND MAINTENANCE. It's complete and
the element, the resistance of the
comprehensive
lists 4500 direct substitutions comprised of American, Japanese, British, French,
cell R4 is low enough that its paralGerman, Dutch and Italian transistor types. Includes both triodes and tetrodes. Not only are the
lel resistor (R5 in Fig. 5) can be
by H. A. Mlddleton
-
- ...
direct electrical substitution shown, but case styles,
dimensions and basing diagrams for the original
and substitute also are given. #276-$1.50.
At your Electronic Parts Distributor,
or order direct from publisher.
JOHN F. RIDER, PUBLISHER, INC.
Rider division of Hayden Publishing Co., Inc.
116 West 14th Street, New York 11, N. Y.
In Canada: Charles W. Pointen, Ltd.
66 Racine Rd., Resdale, Ont.
Egg
42
PF
Rc'PORTER/April, 1962
overlooked. R4, R6 (the contrast
control) and R7 form a voltage divider across the video load L1 -R2.
As the light on the cell increases,
its resistance decreases and permits
more of the signal voltage from the
Fig. 7. Automatic brightness control.
video amplifier to be developed
across contrast control R6. This increases the video coupled by C5 to
the CRT, and adds more contrast to
the picture.
In order to effect a more linear
change of the picture contrast, a second form of automatic video control
is provided. Fig. 8B shows a simplified layout of the secondary control arrangement. This arrangement
controls the screen voltage of V1
and, as a result, the video gain in
V1.
When the controlling resistance
Rc lowers in value (due to light on
the cell) more plate voltage is applied to the video amplifier V 1, and
the tube might add some distortion
to the video signal. However, the
voltage at point A and the screen
also decreases because of voltagedivider action, and the amplifying
characteristic of V is altered slightly. This compensates for any non linearity introduced by the increased
plate voltage, and assures a proper
1
balance between contrast and brightness during Magic Eye operation.
More Voltage Dividers
DuMont provides
automatic
brightness and contrast control in a
circuit arrangement shown in the
simplified schematic of Fig. 9. When
ABC switch S1 is off, R5 and R6
(point A) set the normal screen
voltage for V1, and the light-sensitive cell circuit is disabled. For manual control of brightness, the cathode of the CRT is connected
through R17 to the slider of R16,
the brightness control. R16 chooses
the cathode voltage for the CRT,
setting the brightness level of the
raster. Normal video is chosen by
the slider of contrast control R9,
which couples the video signal to the
CRT cathode via C3.
The automatic action is the result
of voltage dividers in the supply
ET -7
HI-POWER
AMP-PNP
THE TRANSISTOR LINE THAT TUNG-SOL TAILORED TO YOUR NEEDS
HIGH TURNOVER
LOW INVENTORY
PROFIT
RELIABILITY
CUSTOMER SATISFACTION
"ET"
is your guide to the compact
transistor line engineered and packaged specifically for entertainment replacement. You can make just about
every radio and TV replacement from
only a handful -size inventory. Eleven
PNP and NPN types replace hundreds
of older numbers.
Each package is plainly marked with
the type of service as well as the part
number to save you time in selecting
the units you need. Every Tung -Sol
transistor is fully warranted. Tung -Sol
takes your responsibility seriously and
spares no effort to provide the very
highest in transistor performance. So
make your transistor purchases with
an eye to convenience, profit and customer satisfaction. Tell your supplier
you'd rather have Tung -Sol "ET"
transistors. Write for the Tung -Sol
Transistor Interchangeability Guide.
Tung -Sol Electric Inc., Newark 4,
New Jersey
TUNG-SOL
A TYPE FOR EVERY JOB
PNP TYPES
Low power
ET1
Mixer/oscillator/
converter
ET2 IF amplifier
ET3 AF amplifier 6v.
ET4 AF amplifier 12v.
ET5 AF amplifier 9v.
Medium power
ET6 AF power amplifier
High power
ET7 AF high power
amplifier
NPN TYPES
Low power
ET8 Mixer/oscillator/
converter
ET9 IF amplifier
ET10 AF amplifier 9v.
ET11 AF amplifier 12v.
April, 1962/PF
REPORTER
43
FOR
BETTER
FOR
BETTER INSULATION
FOR
BETTER
WATERPROOFING
FOR
BETTER
RESUITS
PRITIETION
.. .
44ElfiTRO!%
.
eNEMTROrget
ACRYLIC
KLEEH
SPRAY
tPieication [eat es a Me
coating . . . wit toe
°`iole inóutºting cseledies*
leeht<ri
RECOMMENdEO FOR:
EQUIPMENT
ELECTRONIC
ElECTRICAL WORK
AUTO IGNITION SYSTEMS
tic Mg/
circuits. When switch S1 is open, or
on, the voltage at point A is divided
across R4, R2 -R3, R12, and R13.
If increased room lighting strikes
the cadmium sulfide cell R2, the resistance of R2 -R3 decreases and applies more voltage to point B; as a
result, more voltage is developed at
point C, also. The increase at point
C raises the positive grid voltage
and causes the CRT beam to increase and make the raster brighter.
At the same time, the increase in
screen voltage at point B raises the
gain of VI so that more video signal
is sent to the contrast control and to
the CRT. Thus, light-sensitive cell
R2 controls both brightness and
contrast in a comparatively simple
manner.
In order to assure that the CRT
operates over a proper brightness
range, Rl l applies a small amount
of the voltage change from point D
to the CRT cathode. This prevents
the cathode and grid voltages from
becoming too nearly the same and
causing improper CRT operation.
Troubleshooting
Troubleshooting these systems
shouldn't be difficult if you understand the circuits. A step-by-step
technique can be developed which
will apply to these and any other
automatic brightness and contrast
circuits which may crop up. The
steps in locating trouble in one of
these circuits are as follows:
(1) Switch the ABC circuit off
and adjust the manual controls for
normal contrast and brightness.
Where an ABC switch is provided,
it includes some method of removing the effect of the light-sensitive
cell from the circuit; be sure the
REDUCES IN BRIGHT
R4
LIGHT
C -S CELL
0
I
R6
TO CRT
R7
(A) More video available for R6.
R2
8200n
RT
18K
SCREEN VOLTAGE
CONTROLLED BY
CONTROLS TUBE
CADMIUM SULFIDE
AMPLIFICATION
CELL
(B) Screen tap keeps change linear.
8. Automatic contrast control is
affected in two ways by cadmium cell.
Fig.
switch is doing this. Putting your
hand temporarily over the cell will
block enough light to cause a noticeable change if the cell is still in the
circuit. If the manual controls can
be set normally, the brightness and
contrast circuits are okay, and you
can proceed to the next step. If not,
the trouble has nothing to do with
the automatic control action, and
should be serviced the same as in
any manually -controlled receiver.
(2) Switch the automatic brightness control circuit on and note the
effect on the picture. You must keep
in mind that the levels are set primarily by the manual controls, and
the automatic circuits merely vary
this original level to suit room conditions. For this reason, there should
be little change from one setting' of
the switch to the other. If a wide
Please turn to page 49
Monutocrwred in a6<tdM
with k8ì1 Spec. MiLC-14599
No. 890
Net Wt. 16 oz.
A truly clear acryli_ protective finish
that will not become cloudy
Has 3D% mo-e acry is tor greater irsulatirg proper -Ws
Will dry within minutes
Will rot "rur"
Manracturec in ac:oriance with MIL
Specs MIL -C-12599
Moistire resiatint
Dealer Net
$,39
CHEMTRi:NICs
871 East
44
PF
52nd Street,
bee.
lroonlyn 3, New Perk
IMPORTER/April, ''962
Fig. 9. DuMont's automatic brightness- and contrast -controlling circuits.
...WITH THE JFD SPECIFICATIONS
HAT COMPETITION FORGOT(?)
HERE IS THE ANTENNA AMPLIFIER COMPARISON CHART
<,<'
THIS IS THE ANTENNA
AMPLIFIER
WHO
ANTENNA AMPLIFIER
COMPARISON
CHART
MANUFACTURER
TEST'.
MADE THIS
COMPETITOR A
List $29.95 plus Batt.
COMPETITOR
B
List $44.95
L
r
COMPETITOR
t
,n,,
18 db
13 db
4 db
17.2 db
2. Average gain, high band
14 db
7 db
9.5 db
13.5 db
3. Average VSWR, input
1:1.5
1:2
1:2.5
1:2
4. Average VSWR, output
1:1.5
1:2
1:3
1:2.5
YES
NO
NO
(INPUT ONLY)
YES
NONE
Balanced input & output ferrite
transformer
6. High pass input
7.
filter
Channels where amplifier phase
shift hurts picture quality
$36.95 -AC and $34.95 -DC List
.
1. Average gain, low band
5.
JFD TRANSIS-TENNA
C
List $39.95
9. Designed with enough power to
drive up to 6 TV or FM sets
10. Two section power supply
filter
11. Circuit stability (won't oscillate)
1:1.4
1:1.4
(INPUT ONLY)
YES
NO
NO
NO
NO
YES
CH. 2, 3, 4
Ch. 2, 3
CH. 2, 6
YES
NO
NO
NO
NO
YES
NO
NO
YES
YES
NO
YES
NO
YES
NO
EXCELLENT
FAIR
POOR
GOOD
NO
NO
NO
NO
2. Polarity and Gain Control switch
YES
NO
NO
NO
NO
-way
4. Rectifier,
filter condenser
YES
AC
6. No -strip terminals on both input
and output of amplifier and
outputs on power
supply
1.
List price
2. Dealer net price
3. Compact, set-up display carton
4. Nationally
advertised to your
customers
5. Cost per year to operate
sible" engineering provides you with "on -off" switch
so amplifier can be turned off when TV is not being
used.
control is needed in JFD amplifier since it is
designed and tuned for maximum gain on all channels
at all times. Moreover, if a local signal is strong
enough to require attenuation, why penalize all the
other channels by turning down the gain control?
Instead, JFD engineers recommend that the serviceman pad the offending channel only, leaving all the
others to come in with maximum gain.
Neither is a polarity switch needed. Polarity is set
at time of installation. Why offer the TV viewer a useless polarity switch? If he or one of the family should
accidentally reset the switch, it means a needless callback at the serviceman's time and expense.
It's common sense to provide a minimum of necessary operating controls for the use of the consumer.
The fewer the controls the smaller is the possibility of
trouble with consumer handling of unit. This is part of
1FD engineering philosophy.
YES
NO
ANTENNA)
YES
BATTERY TYPE
POWER SUPPLY
YES
NO
YES
YES
NO
YES
YES
YES
YES
YES
OUTPUT OF
AMPLIFIER ONLY
YES
NO
2
4
4
2
34.95
29.95 + BATT.
44.95
39.95
20.97
19.00 + BATT.
28.77
26.63
YES
NO
NO
NO
YES
YES
NO
NO
NO
YES
27g
AT LEAST
BATT. REPLACEM.
CE
27g
27e
27e
power supply
7. Number of set
~
Why add something not really needed? Almost all AC
outlets are duplex types nowadays. Besides, power
supply and amplifier will always remain "on" if TV
set is plugged into built-in AC receptacle. JFD "sen-
No gain
REMOTED FROM
plifier
Electric Power Supply with
isolation transformer
NO
INSTALLED WHEN
AMPLIFIER IS RE-
power supply is designed to provide more than
adequate filtering under standard load. Why use two
filters when one better filter will do as well? With the
bonus of fewer parts that minimize servicing needs.
JED
and
power transformer in power unit
instead of up on antenna am5.
"micro -alloy diffusion transistor" production technique. JFD uses PADT denoting "post -alloy
diffusion transistor" production technique. Both types
are 4-lead VHF transistors with high gain, low noise
figures.
YES (NOT EASILY
amplifier mounting
Ferrite transformer is used in JFD amplifier input only.
Not needed in output because the output circuit has
been designed for 300 ohm balanced operation.
MADT denotes
EXCELLENT
YES
bracket that is easily mounted
anyplace from antenna boom to
TV set
--
NONE
AC receptacle on Power Supply
for plugging in TV
3. 3
AMPLIFIER
18 db
15 db
a
1.
tërina
-
8. Uses MADT 4 -lead (VHF) transis-
tor with high gain, low noise
figure
rfltransis -
S.
eprints of the above chart are available on request. JFD will be
pleased to send you also its Transis-tenna brochure which shows
you how to convert its many consumer benefits into profits.
4
Because the best place for the amplifier is at the
antenna terminals. Why defeat the very purpose of an
amplifier by attaching it any place but the right place?
at the point of highest signal-to-noise ratio
the
antenna's take-off points. Be it single -driven, twin driven, stacked -conical, Yagi or any other antenna design, that's where the JFD amplifier goes.
$36.95 -AC and $34.95 -DC List
As low as ;22.70
As low as $21.47
for AC.
for DC.
No -strip
-
terminals are used only on output of JFO
amplifier and JFD power supply. The input to JFD amplifier is effected through indestructible heavy gauge
solid aluminum busbars which attach directly to antenna terminals. (One less potentially troublesome twin
lead connection.)
Automatic Brightness Control
change occurs, it is likely there is
some defect in the ABC system.
(3) In a semi -darkened room, or
with a shade over the light-sensitive
cell, adjust the manual controls for
proper viewing. Be sure the contrast
and brightness have a normal gray scale relationship; use a test pattern if one is available. A piece of
white double -weight cleansing tissue makes an excellent shade during
initial adjustments in a very bright
room; this allows the cell resistance
to remain about 40K or 50K, and
results in more accurate adjustments. However, be sure you allow
for the fact that room light can cast
a glare on the CRT screen, causing
a properly -adjusted picture to appear slightly faded under these conditions. When you remove the paper
shade, the picture should increase
markedly in both brightness and
contrast.
(4) If no change is noted in the
picture from a bright room to a
darkened one (or a shaded cell),
you must look for trouble in the
automatic circuits. The light-sensitive cell is the most likely suspect, so
check its operation first. It usually
has a long set of leads which plug
into the chassis at some point; these
leads can be unplugged and the cell
removed for tests. Or, if you prefer,
just unplug the leads and take measurements across the ends of the
leads, with the cell in its mounting.
An ohmmeter provides the easiest
way to check these units. Those cells
most commonly used will show a
resistance of several megohms in
completely dark surroundings (hide
it in your coat pocket). In ordinary
room lighting, the resistance drops
to a few thousand ohms, or perhaps
10K. In bright lighting, or with a
flashlight shining directly on the element, the cell drops to a value of
200 or 300 ohms. If these light
changes result in the proper resistance variation, the cell can be considered okay.
(5) Checking voltages in the DC
divider arrangements of the automatic circuits is the next step. In the
circuit of Fig. 4, for instance, points
A, B and C each develop certain
voltages during "bright" operation,
which change during "dark" operation. If one of these voltages does
not change, or is very far from its
TV TIPS
FROM TRIAD
(Continued from page 44)
usual level, you can assume some
trouble exists in the associated
divider network.
In Fig. 4, you will notice two possible connections to the CRT first
anode-one to B+ and another to
the boost voltage. This is because
CRT's have varied characteristics,
and to obtain a suitable brightness
change, either voltage may be
chosen. If this circuit fails to produce a change in brightness or contrast with a variation in cell illumination, try moving the tap to the
other voltage; in many instances,
this will solve the problem.
The circuits of Fig. 5 include a
complicated network of voltage
dividers, but Figs. 7 and 8 will enable you to find the most important
voltage points. Point A is the junction of R9 and R I l , which you will
note from Fig. 5 is at switch S1.
Point B is the CRT cathode.
The same voltage -analysis techniques apply to the circuits of Fig.
9. The key test points are A, B, C,
and D. Of course, the manual
brightness control and contrast circuits are more or less conventional,
and need no further explanation.
(6) In connection with voltage
checks, don't overlook the fact that
improper voltages can result from
defective capacitors in a circuit, as
well as resistors which have changed
value or become otherwise defective.
For instance, in Fig. 9, C2 or C4
could drastically alter the CRT grid
bias if either capacitor were to become leaky or shorted. This, of
course, would alter the brightness,
possibly even making the CRT completely black. A leaky C3 would
apply too much positive voltage to
the cathode, with similar results. In
Fig. 4, C4 or CS could cause trouble
with the brightness levels, if either
became defective.
Summarizing
When you learn to consider automatic brightness and contrast controls as variable divider networks,
their mystery is gone and they suddenly become very simple to service.
If you learn these basic circuits, and
the function of each divider network
in the over-all action, you will have
little trouble diagnosing the cause of
failures in these circuits or in similar
circuits which you may encounter in
the future.
NO. 16 IN A SERIES
LET'S
GET
THE RECORD
STRAIGHT
"Where's Joe?" asked parts salesman
Al.
"Reading up on electrolytics, I suppose;' smiled Bill, the Senior PTM.
"How's that?"
"Well, Joe got this 19 -inch portable
job that was keystoning. Right away,
he says to himself it's got to be the
yoke. But it wasn't, and he fooled
with that thing for the longest time.
He'd still be at it if I hadn't pointed
out that a lot of new 19- and 23inchers use the B+ boost voltage for
the vertical output stage rather than
the B+ source:'
"Has to do with giving you enough
vertical scan on the big CRT's,
doesn't it?" said Al.
"Right. In a lashup like that, they've
got a filtering capacitor, usually an
electrolytic, to take care of the horizontal spike coming from the B+
boost voltage source. When this capacitor opens the filtering action
drops. This causes the spike to show
up at the plate of the vertical output
stage and in the vertical yoke coils.
The rest is simple. You lose some in
the vertical and horizontal sweeps
and it's just like a keystone from a
flubbed out yoke:'
"Hmm;' said Al slyly, "I guess Joe
will make a better Keystone cop from
HE CONVENIENTLY OMITTED THE
JFD TRANSIS-TENNA AMPLIFIER.
am not surprised, but I am disappointed at my
competitor's oversight.
Just for the record, only the JFD transistorized
amplifier has the unique and desirable feature
of mounting directly on the dipole terminals at the
point of lowest noise level. It is available as a
built-in part of 16 JFD Transis-tenna antennas.
It is also used as an "add-on" amplifier that is
universally adaptable to any other antenna be it
inline Yagi, conical or otherwise. In my opinion,
this versatility makes the Transis-tenna the best
of the "add-on" amplifiers.
had believed that the members of the antenna
industry had outgrown the need for such so-called
"authentic" comparison charts. At this point,
however, feel that every distributor and dealer
is entitled to know the complete story. So with
apologies to our competitors, we are reproducing the
data from his chart with the JFD features added.
invite your review of the now complete analysis.
Judge for yourself which is truly the best "add-on"
antenna amplifier in value and performance.
I
I
I
I
JFD ELECTRONICS CORPORATION
now on:'
MORAL: Don't knock the Triad
Y-66-1 until you've checked out the
filtering capacitor. In the meantime,
get on Triad's permanent mailing list
and receive the new catalog TV -62 as
well as other helpful literature.
Write Triad Distributor Division, 305
No. Briant St., Huntington, Indiana.
A
competitor is currently circulating the
"unbiased" antenna amplifier comparison chart
shown on the right. This enlightening analysis
(not surprisingly) claims the competitor's
amplifier superior in every respect.
However, my competitor overlooked (?) one
important detail.
A JFD
DIVISION OF LITTON
April,
- Sales
Open this flap for the complete
INDUSTRIES
1962/PF REPORTER
Edward Finkel,
Vice President
49
"add-on" amplifier story...
...AND HERE ARE SOME MORE EXCLUSIVE
transis- tenna
AMPLIFIER FEATURES OUR COMPETITION NEGLECTED TO MENTION!
supplies 300 ohm male
and female twin lead
connectors for 4 -set
operation or to provide
power supply employs
switch for viewer's
convenience and use when
set is shut off. (Also used
1
four different locations
where set(s) can be used.
on -off
2
by competitor A.)
4
Only the
3
or DC operated amplifier
(excellent for accessible
attic installations).
competitor's.
Only JFD provides you with
Only JFD offers choice of
amplifier is corrosion resistant. It is constructed
of aluminum busbars,
butyrate housing and an
'ridded steel terminal plate.
1FD
multi -set distribution
system uses low -loss ferrite
core transformer circuit...
not lossy resistor design
such as that of our
JFD
JFD
JFD
AC
6
the widest selection of
electronic Transis-tenna
antenna -amplifier distribution systems
that helps you make every
antenna sale a profitable
Transis-tenna sale.
JFD transis -tanna
amplifier integrates
itself into your antenna system
The Transis-tenna is the only amplifier designed to be an electrical and
mechanical built-in part of the antenna.
JFD mounts its amplifier at the point of highest signal-to-noise ratio.
You do not attach it to the mast, or the crossarm, or at the set-but at
only one place, the right place-directly to the antenna take-off points.
That is why you get no makeshift straps, clamps or brackets with the
Transis-tenna. And for all -new antenna installations, JFD offers you the
choice of 16 different Transis-tenna systems complete with integrated
amplifier, antenna, power supply and set -coupling units. You pick the
right electronic antenna package, perfectly matched to the location.
Only the
transis -tanna
amplifier converts any antenna
type into a truly electronic
antenna system!
CONICAL
N
TACKING
BARS.
The Transis-tenna amplifier mounts directly to the take-off points of
antenna in
NOW
...
any1)
seconds.
STACKED
BROADBAND
ARRAY
invites your on-the-job comparison of the design and performance advantages of the Transis-tenna. See for yourself why more quality -conscious, performance -conscious, profit-conscious service -dealers are switching to the JFD
Transis-tenna amplifier.
JFD
PROVE THE TRANSIS-TENNA'S
SUPERIOR PERFORMANCE TO YOURSELF!
egg YOUR
JFD DISTRIBUTOR
TODAY FOR
transis- tenna
THE BRAND THAT PUTS YOU IN COMMAND OF THE MARKET
JFD ELECTRONICS CORPORATION
6101 Sixteenth Avenue, Brooklyn 4, N.Y.
JFD Electronics -Southern, Inc., Oxford, North Carolina
JFD International, 15 Moore Street, New York, N. Y.
JFD Canada, Ltd., 51 McCormack Street, Toronto, Ontario, Canada
i
QUICKER SERVICING
by Art Margolis
Ccm
g
o
'3A'g
- -
WITH
1
In its simplest terms, a Service
Call Repeat Law might be stated,
"Callbacks are inversely proportional to your skill as a TV technician." Such a rule is true as far as
it goes, but it doesn't give the entire picture
not by a long shot.
For it is also true that most TV's
you accept for repairs have more
than a single obvious trouble. More
often than not, a receiver that has
been in use for a few years has developed many worn spots. Weak
tubes, leaky capacitors, changed value resistors, and assorted other
faults in addition to the primary
trouble are likely to be found on almost every repair. You are not
usually summoned till the TV has its
proverbial tongue hanging limp.
No matter how much the set own-
-
er may have neglected his receiver,
he isn't inclined to tolerate neglect
on your part. To protect yourself
against callbacks, you must not only
repair the primary trouble, but root
out all the secondary ailments as
well. If you do not, you increase the
probability of callbacks
it's as
simple as that. Our outfit has been
doing its best to eliminate these
money -losers, and we have been able
to reduce our callback percentage
to a practical minimum. I'll describe our technique in some detail,
so you'll be able to glean some information that you can use to your
advantage.
-
Passing the Time of Day
With
the
schedule constantly prodding you
along, you probably feel you can't
afford to dawdle on house calls.
However, a little "passing the time
of day" doesn't hurt; in fact, it will
pay off in reducing your callback
percentage.
For instance, one day I was out
examining a Silvertone console with
doors. The set owner
a genial,
unkempt woman
greeted me at
the door and immediately began a
rapid stream of talk. By the time I
arrived at the TV and leaned over
to open the doors, I knew that her
daughter had three geniuses for children and an' Army sergeant for a
husband.
I asked her what was wrong with
the television. Then she took many
more words to explain that it was a
little slow in coming on, and that it
had horizontal - frequency trouble
when the picture finally did appear.
I pulled open the doors, and to
my surprise, the TV was playing
merrily. She informed me that she
had turned it on in anticipation of
my arrival.
I removed the back and installed
my cheater cord. As the picture returned, it did take awhile to pull in
horizontally. I rapped the 6CG7
horizontal oscillator with the eraser
of my pencil. The lines went wild.
I tapped the 12DQ6 horizontal
output, too, as a matter of course.
The picture flattened into a vertical
line, disappeared, and then snapped
back. I replaced both tubes, and
horizontal sync was much firmer.
She said, "Every time I change
the channel the TV squeaks." I
clicked the channel selector and
recognized a microphonic noise. The
12W6 audio output tube was the
culprit. When I replaced it, the
squeak was gone, and I felt the repair was complete.
As I wrote up the bill, I casually
is there anyasked, "Think, now
thing else about the TV that disturbs you?"
She said, "Only the squeak," but
then continued in a matter-of-fact
tone with this astounding statement:
"I'm so glad I won't have to turn
on the TV the night before to watch
it in the morning!"
I shook my head. "Would you repeat that?"
She repeated, "It takes a little
long for the TV to come on-about
pressure of
a
busy
-
Fig. 1. Repaired sets are given six -hour
52
PF
REPORTER/April,
1962
"air check"
to reduce callbacks.
FIX OVER 90% OF ALL
TV COLOR TROUBLES
WITH THIS SENSITIVE
TUBE TESTER
THE NEW SENCORE
MIGHTY MITE
II
Thinking of buying equipment for color TV
MODEL TC 114
servicing? Here is the tester that you should place
675°
number one on your list. Why? Because this tester
alone will help you repair over 90% of all color TV receivers.
Faulty tubes cause over 90% of all color TV troubles because the
majority of color tubes have high impedance grid circuits. To detect faults in these critical tubes, sensitive
grid circuit checks are essential. The Mighty Mite checks for grid leakage as high as 100 megohms or as
little as .5 microamps of current. Large expensive testers and the drug store type offering only 2 or 5
megohm leakage checks will pass these critical tubes as good. You can find these tubes in a jiffy with the
and make more
give real service to your new customers with color receivers
famous Mighty Mite
...
...
money too.
Typical high impedance circuits like these, need the Mighty Mite for accurate checks
INADEQUATE RED
HIGH
IMPEDANCE
GRID
_
0
r
6CG7
TO
r11
VOLTS
RCA & ADMIRAL
R -Y
RED GUN
386 VOLTS
bad, would pass the troublesome tube
as good.
AMPLIFIER
INADEQUATE BLUE
If this tube draws as little as 2 micro amps of grid current, the bias is upset
volts causing reduced red signal. To
correct this, you may go to all the
trouble of readjusting the red gun when
the Mighty Mite, with its high sensitivity grid check, would have indicated
the tube bad, saving you this trouble.
INADEQUATE GREEN
2
HIGH
6F07
TO
GRID
GREEN
GUN
x
386 VOLTS
11
VOLTS
150 K.
6AW8A
TO CHROMA
TAKE OFF COIL
TO FLYBACK
ó +
1
MEG
TRANSFORMER
THRESHOLD CONTROL
6FQ7
HIGH IMPEDANCE
GRID
TO
BLUE GUN
CD
386 VOLTS
11 VOLTS
IMPEDANCE
COLOR INTERFERENCE
RCA & ADMIRAL G -Y AMPLIFIER
If this 6FQ7 tube starts to draw only
2 microamps of grid current, the tube
bias will be upset 2 volts because of the
high impedance one megohm grid resistor. An old fashioned tube tester, or
drug store type that requires 25 micro amps of current to indicate the tube as
RCA & ADMIRAL G -Y AMPLIFIER
Conventional tube testers will not show
this tube bad until it develops a change
of 25 volts positive bias in circuit. The
Mighty Mite will find it as soon as it
starts to cause poor color mixing.
RCA & ADMIRAL COLOR KILLER
If the tube draws only 1 microamp of
current through this 10 megohm grid
resistor the bias will be upset 10 volts
restricting operation of the color killer.
Color signal will interfere with black
and white programs. The Mighty Mite
will locate this faulty tube in a hurry
while old fashioned testers will pass it
as good.
Checks them all, including the New
RCA Novars, Nuvistors, Sylvania 10 Pin,
GE Compactrons, and picture tubes too.
A
real money maker for servicing color,
black and white, radio, Hi-Fi.
Available at Electronic Parts Distributors Manufactured by Sencore, Inc., Addison, Ill.
April, 1962/PF REPORTER
53
NEW SAMS BOOKS
B RAND-NEW
14th Edition of
the Famous Howard W. Sams
Tube Substitution Handbook
Still Only $1.50
* Includes Over 1400
New Substitutions
* Brand -New Section
on Subminiature Tubes
This newest edition is more
valuable than ever! Now lists
more than 6,600 DIRECT substitutes (1400 more than in
prior volume), including new
section showing substitutes for
over 250 subminiature types. 3050 substitutes for
1758 receiving tube types. 242 industrial and 622
European substitutes for American receiving types;
530 American substitutes for European types. Picture -tube substitutions now include 43 new types
(508 total) and over 1900 DIRECT substitutions. A
"must" for every tube caddy and service
$15/
bench. 112 pages; 5j5 x 8
Still only
.
Transistor Radio Servicing Made Easy
Wayne Lemons has written the first completely
practical book on the subject-based on nearly a
year of hie own experience in perfecting a technique
to insure profitable repairs. You get the benefit of
his experience-no "hole and electron" theorybut solid, practical circuit explanations and servicing procedures that will help you repair almost any
transistor radio in minutes. The final chapter alone,
on parts procurement and
is
S,""
worth thepboo kcost. 128 p.; bß
Only
8
wellstitution,
FM Multiplexing for Stereo
The moat up-to-date volume on this brand-new
broadcasting technique. Leonard Feldman expertly
describes the new receiver and adapter designs, as
well as the problems of converting existing sets and
developing new servicing and alignment methods.
8 fact -packed chapters cover the FCC -approved
system, converting present sets, servicing multiplex
circuits, adapter alignment, typical circuits,
$ slr8
etc. 128 pages; 5jß x 8W. Only
Basic Electronics Series: Transistor Circuits
Capt. T. M. Adams completely explains basic transistor circuits. As in his previous 3 volumes, 4-col.oa
circuit diagrams show you exactly what actions
take place during every moment of operation.
Each and every electron current ie unmistakably
identified, as are the changes each undergoes in
actual operation. Covers: Transistor Physics Simplified; Special Techniques & Definitions; Oscillator
Circuits; Amplifier Circuits; Detector
pq
5295
Circuits. 128 p.; 53 x 8h,". Only
Single-Sideband Communications Handbook
Only book of its kind. Harry D. Hooton presents
much previously unavailable data on this important
subject-invaluable to anyone in communications,
including engineers, hams, and technicians.
Describes single-eideband development, carrier suppression, carrier generators, speech amplifiers and
filters, balanced mixers and converters, linear power
amplifiers, SSB receivers, tests, measurements,
etc. 320 p.; hardbound; 5 jx83v.Only
eight hours. I turned it on last night
so you could fix it this morning."
I sighed and removed the back once
more.
Awhile later I was done. A 200mfd power -supply filter capacitor
was in bad shape
apparently so
bad that it took eight hours to build
up a full charge. I replaced this part,
and sidestepped a recall
thanks
to dawdling and talking.
12BH7
-
/
-
Order from your Sams Distributor today, or mail
to Howard W. Sams a Co., Inc., Dept. D-32
1720 E. 38th St., Indianapolis 6, Ind.
Another callback -cutter is a good
check-out on all bench jobs. Our
procedure is simple and effective:
We let the repaired sets play continually for about six hours on the
rack shown in Fig. 1. At the end of
about three hours, We test the operation of all the controls and test
the tubes for defects. At the end of
six hours, we check the controls
once again. If everything is AOK,
we turn the set off and deliver it.
I'd say that at least 50% of the
TV's on checkout require some type
of alignment, adjustment, or tube
replacement during the air check.
Also, at least 10% require an additional component replacement or
more bench analysis
like the 21"
G -E 21C102 that appeared in the
shop with a tag labeled, "No vertical sweep, check lin pot." When it
first arrived, I followed the message
from the outside man and checked
the vertical -linearity control. It was
one of these little screwdriver slotted affairs similar to a buzz control. The customer had been in there
with a screwdriver; the wiper arm
was turning but not making contact
with the resistive element.
I quickly installed a new pot and
turned on the TV. There was no
more trouble with vertical collapse;
Send me the following books:
Tube Susbstitution Handbook. Vol. 4 (TUB -4)
D Transistor Radio Servicing Made Easy (TRE -I)
FM Multiplexing for Stereo (FMS -1)
Basic Electronics Series: Transistor Cir. (BET -1)
Single-Sideband Communications (NH -1)
enclosed.
S
D Send
High - resistance solder joint
here caused vertical -linearity problem.
the picture spread out fine. When I
checked out the rest of the TV, it
looked good, so I put it on the
check-out rack.
At the end of three hours, I
routinely examined the set. The
raster had shrunk some on the top
and bottom. I restored the full sweep
by tenderly adjusting the new linearity pot. A few minutes later, I
glanced over at the G -E and saw a
headless man on the screen. The
scanning lines near the top were
wide enough to put a finger through.
I readjusted the pot and all was well
once more, for about five minutesthen the top and bottom came in
toward each other again.
Since I wasn't about to gouge out
the new pot as the set owner had
done before, I put the chassis back
on the bench.
I stared at the vertical oscillator output tube, a 12BH7. It seemed to
be a bit dim for awhile, and then
brightened up to normal. I replaced
54
IN CANADA: A. C. Simmonds 8 Sons, Ltd., Toronto 7
PF
(outside U.S.A. priced slightly higher) at
REPORTER/April, 1962
s'ama
cost)
Normally shipped same day received
90 day full guarantee
U/V combinations $17.95
FREE -11
sw
REBUILT OR
EXCHANGED
ALL TYPES
Free Book List
Zone-State
ww
*
(except broken wafers-billed at
Address
lisi
2.
9.95 Including all parts and labor
Name
City
'
CONNECTION
a
Fig.
TV TUNERS
'
INTERMITTENT HEATER
hI'
0"
HOWARD W. SAMS & CO., INC.
.it
s1
Check -Out in Shop
-
.
Mailing carton sent to you on request
Phone REpublic 3-9189
4611 West Jefferson Blvd.
Los Angeles 16, California
L. A. TUNER EXCHANGE
Transistors are here to stay ... they are now b - `'_ used-ëverywhQre; in
radio, television, Hi-Fi, intercom, and in nearly all new electronic equipment...
Why put off transistor circuit servicing any longer...
there's gold in them thar hills. But you must be
equipped to do the job fast and efficiently. Here are
the tools that you will need.
NEW SENCORE TRANSI - MASTER
This Tester will analyze the entire circuit in minutes and test transistors
in -circuit or out of circuit. Here is how you can pin point troubles step
by step. with the TR110.
First, check the batteries with the 0 to 12 volt meter. If the batteries are
O.K., check the current drain with the 0 to 50 milliamp meter. A special
probe is provided so that you do not need to break the circuit. Excessive
current indicates a short; low current indicates an open stage or cracked
board. All PF schematics indicate average current.
If trouble is not located by now, isolate the trouble to a specific stage
by touching the output of the harmonic generator to the base of each
transistor and note spot where sound from speaker (or scope where no
speaker is used) stops or becomes weak. The generator becomes a sine
wave generator for audio stages to help find distortion.
If trouble points to a transistor, check it in a jiffy with the exclusive
in -circuit power oscillator check provided by the TR110. A special probe
is also provided for this.
1f the transistor checks bad in -circuit, remove it and give it an out of
circuit check with the oscillator check or the more accurate DC check.
The DC check is provided for comparison reasons, experimental or engineering work and to match transistors in audio output
stages. Beta (current gain) is read direct or on a good-
bad scale for service work.
DEALER NET.
NEW SENCORE TRANSISTOR
Ill
AND DIODE CHECKER
Here is a low cost tester that has become America's favorite. The TR115 provides the same
DC out of circuit checks as the TR110; leakage
and current gain. Beta (circuit gain) can also
be read direct or as good or bad. Opens or
shorts in the transistor are spotted in a minute.
The TR115 checks them all from power transistors to the small hearing aid type. Japanese
equivalents are listed also. This famous tester
is used by such companies as Sears Roebuck,
Bell Telephone and Commonwealth Edison.
New circuits enable you to make service checks
without set-up charts even though charts are
provided for critical checks.
TR115K Available in
4950
iIlf
TR115
Dealer Net
Model
Kit Form. Dealer Net $13.95.
ALL PARTS
Now in stock at
your Authorized
Sencore Distributor
ONLY
S HIV CORP:
MADE IN AMERICA
$1996
Tests all transistors
in -circuit or out-of -circuit
Model TR110
It's a COMPLETE TRANSISTOR
TESTER
SIGNAL TRACER
VOLTMETER
BATTERY TESTER
MILLIAMIMETER
SENCORE BATTERY ELIMINATOR
AND TROUBLE SHOOTER
For replacing batteries during repair.
Many servicemen say that they wouldn't service transistor circuits without this power supply.
The tried and proven PS103 is a sure fire
answer. It can be used to charge the nickel
cadmium batteries as well. Dial the desired
output from 0 to 24 volts DC and read on
meter. Low ripple insures no hum or feedback.
Total current drawn can also be read on the
PS103 by merely flicking the function switch
to milliamps. The PS103 is the only supply
that will operate radios with tapped battery
supplies such as Philco, Sylvania and Motorola.
No other supply has a third lead.
Model
PS103
Dealer Net
$1995
SENCORE
ADDISON, ILLINOIS
General Electric reporter,
Roland Kempton, makes the rounds with
the independent service dealers .. .
Don Ellis saved
30 minutes
and $3.75
because
1e:
one G -E
:.
M.."
.
_
SERVICE-DESIGNED
capacitor takes
the place of 4
ordinary types
In minutes and money, Don Ellis and George
Bentley, owners of QUALITY TV, Kansas City,
Mo., measure some of the advantages of stocking
G -E Service -Designed capacitors. Don (shown
here) put it this way, "We didn't stock can-type
capacitors before because we never knew what
types we'd need. Now, with just 25 or 30 capacitors in stock we meet most of our requirements,
and we don't have to make special trips to pick
up exact replacements. I figure this saves 30
minutes and $3.75 per trip."
And according to George, "There have been
many occasions, especially on Saturdays, when
we've been able to get the set out because we've
had G -E capacitors in stock. Our customers
really appreciate it, and we haven't had a single
call back."
SekleeE- UM/
CAPACITOR
xC3.r
r.s.,ev
XCi.10
xcI.is
xcn `-Ys
uCkr24iR
9FACl10R
'-`º'?
3
73-ogress
/s Our Most Important 73oduct
CAPdC6I51
30,04410,4.4301/
1,k411Mte,.490u
404 .mF,lser
Yes, it pays to stock General Electric Service Designed capacitors. Get full details from your
G -E capacitor distributor. General Electric
Company, Electronic Components Division,
Room 1719, Owensboro, Kentucky.
:
XC3-40
xC2-2s
CPdCfiOR
xC3-40
r »to., 4,4+
.
j+Mf
GENERAL
ELECTRIC
Fig.
3.
age on
Faulty resistor lowered volt
140 -volt line; killed picture.
the tube, but the new one reacted
in the same way.
With the power off, I began
checking the heater line and discovered the trouble when I grasped
the heater-ground wire coming out
of the 12BH7 socket. It was hot! I
noticed a discoloration where the
wire went into a cone -type terminal
-one of those connection points
that stick up like little spikes on
top of the chassis (Fig. 2) . I pulled
on the wire, and found that it was
firmly soldered. I turned on the TV
and continued pulling as the wire
got hotter. Suddenly it pulled loose.
The heat caused by a high -resistance
joint was doing the unsoldering. To
cure the trouble, I resoldered the
wire to the chassis itself. Can you
imagine completing this repair without an adequate check-out?
Psychological Approach
Some callbacks have psychosomatic overtones. People somehow
feel that if you repair their TV, it
should play perfect from then on.
If the set should develop any kind
of trouble within a few months' time,
it is your fault. A psychological approach is needed to quell this type
of callback. You have to destroy this
laymen's notion that the TV will
continue to play forever, and instill
the idea that sets are going to need
periodic maintenance.
I have in mind one set owner who
gets special treatment. A finicky matron who is head bookkeeper in a
large firm, she's the type that sends
a restaurant meal back three times
no matter how delicious the food.
The last job we did on her 17" RCA
not
was a "raster only" trouble
a peep from the speaker, and zero
-
contrast. Tubes didn't help, so I
hauled the chassis into the shop.
I began checking voltages. When
I arrived at the plate of the third IF,
I found only 30 volts instead of the
prescribed 125. I tested the screen
grid and saw that the required 165
volts was present. Strange.
Perusal of the schematic (Fig. 3)
showed that the screen was connected to the 265 -volt source in the
power supply, but that the plate
voltage had a different origin-the
140 -volt line. The rest was easy. A
2500 -ohm, 10 -watt resistor between
the two B+ source points had increased in value to 100K.
I replaced the defective resistor
with a new one, and the TV once
more played well. It went through
the final checkout without a hitch,
so I loaded it aboard a truck and
drove to the customer's home. From
past experience I knew that delivery was not going to be easy, but
I had my plans.
She greeted me warmly, and I
carried the chassis in. As I installed
it, I turned the vertical linearity pot
all the way up. As the raster came
on, she began to complain. I smiled,
"I haven't made the final adjustment yet. You watch and tell me
when I have it right."
The picture was 'way too high.
As she watched, I gradually drew
the linearity back down. She
snapped, "Hold it, right there! It's
fine!"
Then I prepared for the coup de
grace. I placed my hand in the chassis area and said solemnly, "Now
I'm going to make the final adjustments for focus and straightening."
I clenched my fist, not touching
anything, and grimaced. She said
now a
"That looks a little better
little bit more." I grimaced mightily
in great effort. She shouted, "That's
it, hold it; don't touch it again."
I buttoned up the back of the TV
and left her pleased. I knew I
wouldn't have a callback there unless it was a legitimate case.
That's about all there is to our
callback story. Any more attention
to detail involves unwarranted expense. All you have to do to reduce
your callback percentage is dawdle
profitably on house calls, air -check
every chassis for a few hours after
bench servicing, and use a little sensible showmanship.
-
Another New Service Aid
From General Electric
SERVICE -DESIGNED
Capacitor Tab
Adjuster saves
time-easier to
use than pliers
"How soon can I get a couple
of them?"
That was Don Ellis' first
comment after he tried out
this new tab adjuster. This
handy Service Aid from General Electric is easier to use
than needle -nose plierssaves time on service calls
and at the bench. The slotted
end fits over capacitor
tabs; won't slip off. A
quick twist locks or unlocks the tabs. 8 inches
long; plastic handle.
Here's one of the most
useful Service -Designed
tools for the bench and in
your service case. Order
now from your G -E capacitor distributor or mail
coupon to Chicago warehouse address shown.
i
Regress /s Our Most important »odud
GENERAL
ELECTRIC
General Electric Company, Dept. 1719A
3800 N. Milwaukee Ave., Chicago 41, III.
Please ship prepaid:
ETR-2968 Capacitor Tab
Adjuster, $1 each.
My check or money order is enclosed
for the required amount plus any sales
or use tax applicable in my area.
Name
Address
City
Zone
April, 1962/PF
State
REPORTER
57
except where allowablé deviations
are specifically stated by the FCC.
However, as a receiver ages, and
yarious technicians work on it, the
radiation level sometimes increases
to the point where interference to
other electronic equipment may
occur. Who is then responsible for
bringing the radiation within bounds?
Part 15 of FCC regulations supplies
the answer:
15.69 Interference From a Radio
RADIATION CERTIFICATION
Receiver.
The operator of a radio receiver,
regardless of tuning range, date of
manufacture, or of certification,
which causes harmful interference
shall promptly take steps to eliminate the harmful interference.
The definition of "radio receivers" under these rules includes
TV sets. Since it is the set owner's
responsibility to cure radiation problems, you might be called on to repair a TV that is causing interference. It is wise, then, to know about
different types of radiation and how
they can be controlled.
by Jim Galloway
Have you ever noticed a label,
worded as shown in Fig. 1, on the
rear cover of a new TV set? This
label certifies that the receiver, when
it left the factory, was not radiating
RF energy in excess of the amount
specified in the following excerpt
from current FCC regulations:
15.62 Radiation Interference Limits.
(a) The radiation from all radio
receivers that operate (tune) in the
range 30 to 890 mc, including frequency modulation broadcast receivers and television broadcast receivers manufactured after the effective date specified in 15.68, shall
not exceed the following field
strength limits at a distance of 100
feet or more from the receiver:
Frequency of
radiation (mc)
0.45 up to and
including 25
Over 25 up to and
including 70
Field strength
(uv/m)
See paragraph b
32
AT»
emptying with
lions Commission's
s,
pee i 5, in effect os of dote of
I
58
1.
PF
REPORTER/April, 1962
50
50-150 (linear
interpolation)
174-260
260-470
150
150-500 (linear
interpolation)
470-1000
500
(b) Pending the development of
suitable measurement techniques for
measuring the actual radiation in the
band 0.45 to 25 mc, the interference capabilities of a receiver in this
band will be determined by the
measurement of radio frequency
voltage between each power line and
ground at the power terminals of
the receiver. This requirement applies
only to radio receivers intended to
be connected to power lines of public utility systems. For television
broadcast receivers the voltage so
measured shall not exceed 100 uy
at any frequency between 450 kc
and 25 mc inclusive. For all other
receivers the voltage shall not exceed 100 uy at any frequency between 450 kc and 9 mc inclusive,
1000 uy for frequencies between
10 mc and 25 mc and linear increases from 100 uy to 1000 uy for
frequencies between 9 mc and 10
mc.
This label on new TV set certifies it does not radiate excessively.
Fig.
Over 70 up to and
including 130
130-174
Local Oscillator
and IF Amplifier
Since 1956, manufacturers have
been required to comply with these
rules in the design of their new sets,
Interference resulting from local oscillator radiation was one of many
factors that had to be considered in
the selection of the intermediate frequency used in TV receivers.
(Among the other considerations
were image -frequency rejection, IF amplifier stability, and IF gain.)
Before the intermediate frequency
could be chosen, it was necessary to
decide whether the local oscillator
was to operate above or below the
incoming signal frequency. The
former choice was decided upon because it resulted in better rejection
of image - frequency interference
from high -power communications
equipment in certain frequency
bands. Originally, 21-27 mc was
chosen for the IF because amplifiers operating at these frequencies
provided high gain, and did not
have as strong a tendency to oscillate as those tuned to higher frequencies. The introduction of UHF
telecasting, and the appearance of
new tube designs, later encouraged
the adoption of higher IF frequencies; today, almost all sets use 4147 mc. The use of this higher intermediate -frequency range creates
new problems, especially concerning radiation interference. For example, assume that a receiver is
Can you afford
to guess
WHEN IT'S
SO EASY TO WALK THE TROUBLE
RIGHT OUT OF
THESE TIME CONSUMING
CIRCUITS
STEP BY STEP
SYNC. CIR.
VERT.
& H. SYNC.
DISCRIM.
OSC.
HORIZ.
OUTPUT
HORIZ.
OSC.
VERT.
OUTPUT
VERT.
VERT.
OUTPUT
DEFLEC.
XFORMER
YOKE
HORIZ.
2nd ANODE
HORIZ.
FLYBACK
VOLTAGE
DEFLEC.
XFORMER
CIRCUIT
YOKE
NEW, IMPROVED SENCORE
SWEEP CIRCUIT ANALYZER
MODEL SS117
How many times do you ask, "Why do I take so long finding that sweep trouble?" How often have you wondered
whether weak horizontal sync was caused by defective sync
circuit, horizontal oscillator, or sync discriminator? Can you
quickly isolate inadequate width or low 2nd anode voltage
to the oscillator, output, fly back transformer,or yoke?How
mány times have you changed a good yoke by mistake?
The SS117 will pinpoint troubles like these in minutes with
tfied and proven signal injection, plus yoke substitution for
dynamic in -circuit tests. Error proof push button testing enables you to make all tests from the top of the chassis without removal from cabinet for maximum speed and profit on
every job.
Here are the checks the SS117 makes...
Horizontal Oscillator: Checked by substituting 15,750
variable output universal oscillatorfrom SS 17. Signal can
be injected at any spot from horizontal output grid to
horizontal oscillator to determine defective component.
Horizontal Output Stage: Checked by reliable cathode
current and screen voltage checks made with adapter
socket and two push buttons,
Horizontal Output Transformer: Checked for power
transfer in circuit and read as good or bad on meter.
Horizontal Deflection Yoke: Checked by direct substitution with adjustable universal yoke on SS117.
PUSH BUTTON TESTING
.
.
.
How can you miss
.
.
.
Shooting."
.
Size: 101/4" x 91/4" x 31/2". Wt. lO lbs.
Model SS117
SEE
EACH PACKAGED UNIT CONTAINS:
Ar Easy to Follow Instruction Book Especially
Prepared and Edited by H. W. Sams.
A complete 33 RPM, 10 inch Permanent Record
on "How to Simplify Sweep Circuit Trouble
.
Vertical Oscillator.: Checked by substituting 60 cycle
synchronized oscillator.
Vertical Output Transformer: By simple signal injection
for full height on picture tube.
Vertical Deflection Yoke: By signal substitution for full
height on picture tube.
Sync Stages: Checked by synchronizing triggered horizontal SS117 oscillator from any stage. If oscillator synchronizes, sync is O.K.
2nd Anode Voltage: A new dynamic check using simulated picture tube load. C.R.T. does not need to be operating for current tests. No interpretations-read direct
from 0 to 30 KV.
External Circuit Measurements: By applying from 0 to
1000 volts AC or DC to external meter jacks. Meter will
read DC or peak -to -peak volts. 0 to 300 milliamp scale
also provided for measuring horizontal fuse current.
New features include: Large 0 to 300 microamp meter
for minimum circuit loading; all -steel carrying case with
full mirror in adjustable cover; two 115 volt AC outlets
in cable compartment.
1
Sercore Som says
.
for Color and Black and White
Dealer Net
YOUR AUTHORIZED SENCORE DISTRIBUTOR
SENCORE
ADDISON, ILLINOIS
Exact Replacements for
Original
Equipment
following special
parts have been manufactured as exact replacements for the set
manufacturers shown,
so as to assure top
performance.
The
fat.
No.
O.E.M. Part No.
Use
Admiral
1471-A
1472-A
6332
Sound Take -Off
Sound Take -Off
Horiz. Osc.
7701
455
728185-2
72C132-19
94C17-4
72 B 31,2
KC I.F.
Bendix
Auto
Auto
Auto
Auto
Auto
Auto
Auto
Auto
6501
6502
6503
6504
6505
6506
6507
6508
Radio
Radio
Radio
Radio
Radio
Radio
Radio
Radio
2090237-1
2090237-2
2090237-3
2090237-4
I.F.
I.F.
I.F.
I.F.
I.F.
I.F.
I.F.
I.F.
2090237.5
2090239-1
2090239-2
2090239-3
Crosley
2nd Sound I.F.
7101
157856-1
General Electric and Hotpoint
12-C11
12-C13
6206-PC
6207-PC
6208-PC
6209-G1
Home Radio
Home Radio
TV Ratio Det.
TV Ratio Det.
TV Ratio Det.
TV Ratio Det.
RTL -143
RTL -172
and 163
RTD-026 (WT56X38)
RTD-025 (WT56X37)
RTD-020
RTD-024 (WT 56X36)
Hallicrafter
Sound I.F. and Trap
2nd Sound I.F.
1482 IFT
7101
5181996
51A1859
Philco
6209-Pl
6209-P2
6209-P3
32-4721
32-4689-1, 2
32-4735-1, 2
TV Disc.
TV Disc.
TV Disc.
R.C.A.
1483
1484
1485
1486
1487
1488
1489
6333
IF
RD
RD
RD
RD
RD
RD
Sound I.F.
Sound Ratio
Sound Ratio
Sound Ratio
Sound Ratio
Sound Ratio
Sound Ratio
Horiz. Osc.
N
Detector
Detector
Detector
Detector
Detector
Detector
76437
102692
102644
102253
100364
79141
101219
103103
Westinghouse
235V025H-11,2
(V157661)
12-C14
Home Radio I.F.
68 Osc
Home Radio Osc. 230V039H-01
(V15764-1)
V12128-1, 2, 3
TV I.F.
6204-W3
(QUALITY
3RODU(TF
J. W. MILLER CO.
5917
S.
Main Street
Los Angeles 3, California
EXPORT REPRESENTATIVE:
Roburn Agencies, Inc., N.Y. 13, N.Y.
CANADIAN REPRESENTATIVE:
Atlas Radio Corp., Ltd., Toronto 19, Ont.
60
PF
REPORTER/April, 1962
operating on channel 2 (54-60 mc)
and its IF picture -carrier frequency
is 45.75 mc. Since the local oscillator operates above the incoming
carrier, and the video -carrier frequency on channel 2 is 55.25 mc,
the oscillator will be tuned to 45.75
plus 55.25, or 101 mc. If the local oscillator were not properly
shielded, it could radiate a 101 -mc
carrier which would be picked up
by any FM tuner in the immediate
vicinity. In most cases, the only result would be a dead spot at 101
mc; however, the signal received
from an FM station operating at a
frequency adjacent to 101 mc would
suffer from interference. In the case
of the local oscillator, radiation is
practically eliminated by shielding
the tuner tubes and the entire tuner
chassis. (See Fig. 2.) Shields used
at radio frequencies are made of a
material (such as copper or aluminum) which is a good conductor.
When a magnetic field penetrates a
shield, it induces eddy currents
which tend to oppose the field and
prevent it from passing through the
shield. Good electrical contact
should be maintained at all edges,
corners, and seems in order to present the least possible resistance to
these eddy currents. Tuner shields
which meet the necessary electrical
requirements are sometimes difficult
to remove and replace, but the fact
is that they do serve a worthwhile
purpose and should be replaced by
the technician after any repair job
done in the tuner. Tube shields
should be securely grounded when
replaced.
The grid and plate tanks in IF
amplifiers are also likely to radiate
unless shielded. The 45 -75 -mc IF
picture carrier itself would not
usually cause any problem to other
equipment found in the home; however, its second harmonic (at 91.5
mc) could conceivably affect FM
reception. Unlike the radiated local oscillator carrier, the IF radiation
contains modulation which could
cause quite a bit of interference to
an FM radio signal on an adjacent
frequency. Sync buzz would be one
indication that FM radio interference is due to a radiating TV receiver. IF circuits can also radiate
energy within the television set itself, sometimes causing inverted
(negative) video and herringbone
effects in the picture.
IF strips, especially in late -model
receivers, are generally enclosed in
some sort of shield which is securely grounded to the chassis. (See
Fig. 3.) When a repair job is completed in the IF section of a receiver, all mounting screws or solder
lugs should be refastened to the
shield-not only to prevent radiation from the IF amplifier, but also
to keep outside radiation from entering these high -gain stages.
Horizontal and High Voltage
The horizontal flyback pulses of a
TV receiver are radiated in two
ways. Mechanical vibration of components is the explanation for the
15,750 -cps note heard in the vicinity
of the set. A vibrating part operates
on the same principle as a speaker,
in that the air is disturbed and sound
is transmitted by longitudinal waves.
Although not likely to produce interference in other electronic equipment, this sound radiation is sometimes annoying to people who are
able to hear 15,750 cps. Fortunately, it can usually be reduced in
intensity.
The usual source of mechanical
vibrations is the horizontal output
transformer. Since this unit is not
hermetically sealed, vibration between the core and the windings is
set up in almost all parts of the
transformer. If the mounting screws
become loosened, the intensity of
the note increases. Thus, tightening
these screws may be the only cure
that is needed. If the screws seem
tight, and the transformer is still
loose enough to cause objectionable
"singing," a wedge of wood can be
driven between the transformer
mounting and the chassis. The
wedge places additional pressure on
the transformer and often reduces
Fig. 2. Tuners are completely shielded
to avoid local - oscillator radiation.
Heathkit® develops continuing
tube testing data program
for all customers
SMALL ANNUAL FEE PROVIDES
ROLL CHART DATA FOR ALL NEW TUBES
The unique tube test data console shown above was developed by
Heath engineers for the express purpose of providing accurate,
up-to-date roll -chart information on all new tube types as they
are developed. With this new service all Heathkit tube checker
owners can receive, automatically, latest test data on new tube
types ... eliminating obsolescence ... assuring latest test facilities
for all service operations. Arrangements have been made with
tube manufacturers for necessary samples and data on new tube
types which will then be compiled and transferred to roll -chart
information for all Heathkit tube checkers. Subscribers will receive a supplement every three months and a new roll -chart incorporating this data at the end of the year. Availability of this
service is another of the many advantages you enjoy with dependable Heathkit test instruments!
ANY TUBE CHECKER OWNER IS ELIGIBLE
TO SUBSCRIBE TO THIS SERVICE
Subscription rates are $2.50 per year on TT -IA type testers, $1.50
per year for IT -21 and TC type checkers. If you own a Heathkit
Heathkit TT -1A Gm TUBE TESTER-Professional quality
throughout Indicates Gm to 24,000; micromhos. Constant -current
heater supplies. Ultra -sensitive grid current test. Direct reading
ohmmeter leakage test. Built-in adapter for testing new compactron, nuvistor, novar & 10-pin miniatures. Built-in switch operated calibration circuit. 32 lbs. No money down,$14 mo.$149.95
ADAPTER KIT TTA-1-1: converts earlier model TT -1 to
TT -1A. Includes new cabinet, sockets, selector switches, and
$19.95
necessary tube test data. 13 lbs.
!
HEATH COMPANY
Benton Harbor 68,Michigan
tube checker, send model no. of your checker along with your
proper supplements and roll -chart will be sent
remittance
...
Please Send My Free Copy of the 1962 Heathkit Catalog
automatically.
$forsubscriptions
TWO NEW IMPROVED HEATHKIT MODELS
OFFER FIRST YEAR'S DATA FREE
Heathkit IT -21 TUBE CHECKER
-Tests all tube types including
new compactron, nuvistor, novar
and 10 -pin miniatures. Tests tubes
for quality, shorts, leakage, open
elements, and continuity. Individual tube element switches. "Bad -?-
Good" meter scale.
11
I
bs.
1,1
L]
J
to tube data service
Enclosed is
tube checkers.
for Heathkit Model
Heathkit
Enclosed is $_(including postage)
IT -21 Tube Checkers.
Heathkit
(including postage)
Enclosed is $
TT -1A Tube Testers.
(no.) Heathkit
(including postage) for
Enclosed is $
TTA-1.1 Adapters.
for(no.)
for(no.)
NAME
ADDRESS
CITY
ZONE
STATE
No money down, $5 mo....$44.95
ALSO AVAILABLE AT YOUR NEAREST HEATHKIT DEALER OR DISTRIBUTOR
April, 1962/PF
REPORTER
61
mechanical vibrations.
Because the pulses are large in
amplitude in many parts of the horizontal circuit, they are able to be,
radiated electromagnetically by components and leads acting as antennas. It is this type of radiation
that causes headaches for servicemen. As with the IF signal, the actual 15,750 -cps pulse will not usually interfere with other home electronic equipment. However, since
the pulse is sometimes almost square
in shape and contains many high-order harmonics, interference to the
AM broadcast band is quite possible. Besides causing interference
outside the set, horizontal -frequency
radiation will feed into different portions of the circuitry inside the set.
Various distortions of the video
signal can result from horizontal
pulses being coupled into the IF and
video amplifiers.
Unfiltered high voltage is a common cause of horizontal radiation.
Because the peak voltage of rectified HV pulses is so great, the level
of radiation from a poorly -filtered
HV supply can become high enough
Perma-Power puts you in the P.A. picture
with
the
ROVING
ROSTRUM
complete high -volume
sound system in a single case
a
Use it anywhere-
INDOORS OR OUTIt's Battery-Powered!
Perfect for CLUBS,
SCHOOLS, CHURCHES,
MEETING ROOMS,
RENTALS, ETC.
Shield over IF strip prevents
radiation and pickup of stray signals.
Fig. 3.
to block the broadcast band over a
large area. A common practice in
TV manufacture is to use the aqua dag coatings on the inside and outside of the picture tube as a filter
capacitor for the high voltage. Consequently, if the outer coating should
become ungrounded, the high voltage will be unfiltered and objectionable radiation may result.
Locating Outside Sources
of Interference
In most instances, even when a
TV set is inadequately shielded, it
will not radiate with enough power
to cause interference outside of the
home in which it is located. However, a customer will sometimes
complain of TV, FM -radio, or AM broadcast interference that does not
originate in his own TV set. The
problem of locating the source of
such radiation can become difficult.
The easiest method involves requesting the customer to call some of the
neighbors and have them turn off
their sets. As various receivers are
turned off, the customer or serviceman should watch the interference
and note when it disappears. Should
this method fail, the trouble can
sometimes be located by using a
portable radio or TV (depending on
what type of equipment is being
bothered by interference)
The portable is carried around
the neighborhood and used to pinpoint the area of strongest interference. Should the interfering source
appear to be very far away (over a
block or two), the chances are the
trouble comes from a source other
than a TV set, such as a radio transmitter. However, if an interfering
set can be located, the owner should
be notified, and steps taken to cure
the trouble.
When interference is picked up at
a considerable distance from the offending set, it is either being radiated from the antenna or being conducted via the AC power lines. Horizontal -sweep radiation, as well as
local -oscillator or IF signals, can
travel by both routes. An accept .
feit4n-Cil'tft4Pet.'
COMPANY
3102 North Elston Ave.
Chicago I8, III.
Ask your distributor for
a
demonstration-or write to
Perma-Power for detailed
literature.
62
PF
REPORTER/April, 1962
THE Perora -Power Roving Rostrum is as simple to
use as one -two-three. You open the case, plug in the
microphone, turn on and talk! It reproduces voice or
music clearly, distinctly, and naturally-and covers
audiences of over 500! No electrical outlets are needed:
The Roving Rostrum is powered by 2 standard lantern
batteries that will last more than a year with moderately heavy use.
The Roving Rostrum includes a 10 watt transistor
amplifier, Astatic microphone and accessories, 2 full
fidelity Quam speakers with special anti -feedback
housings, an extra input for phono or radio, and
outputs for auxiliary speaker and tape recorder. Even
the reading desk is part of this compact self-contained
system! Yet it weighs under 30 lbs. for easy portability-and is priced at only $124.50 user net ($175
less than you'd expect!)
SPRÌGTTME
Ì
WITH
VALUETÏME
ROM!!
That's right! Spring's here at last...and RCA's
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bloom! See for yourself...
R
TV HI-FI
SERVICE
SERVICE AIDS FOR YOUR WORK
Service -Special Tool Chest. A newly designed
mate for your RCA Tube Caddy.
with ACA tubes
DISPLAY MATERIAL
Outdoor and indoor signs that advertise your
services to the public.
The famous RCA TV
Toter Table...and other helpful items to make
PLUS
your job easier and faster.
ACCESSORIES FOR OUTDOOR LIVING
Q
1'
Skotch Portable Charcoal Grill
de..
4P41 _.Ad»,
Handsome, durable, lightweight HAMPDEN OUTDOOR
FURNITURE including lawn chair and chaise lounge.
RCA ELECTRON TUBE
All these values can be yours by ordering
the world's finest entertainment receiving
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# :k.# #-:.#'
DIVISION, HARRISON, N.J.
The Most Trusted Name in Electronics
117 VAC
POWER TO TV
PRACTICAL
RECEIVER
1
INGENUITY
-
IN
................... .........
a
philosophy
... an
idea
...
What does it mean? Technical excellence, reliability, performance-combined with sensible pricing. On this philosophy rests the enviable Tarzian reputation for customer
satisfaction. Too, it has earned for Sarkes Tarzian, Inc.
recongition as the producer of "the world's finest tuner for
the world's finest sets". You'll also find this same practical
ingenuity in all of these electronic products from Tarzian:
Ge
GOOD EARTH GROUND
I
I
Ì
I
p
I
able solution to this problem can
often be accomplished by installing
filters in the power -line and antenna
circuits of the set causing the interference.
Radiated signals can be kept off
the power line by means of a commercially -available line filter, or
with the simple circuit shown in Fig.
4. Horizontal -sweep interference can
be prevented from entering the antenna circuit if a commercial highpass filter is placed in series with the
antenna lead. (It should be installed
on the rear cover of the set rather
than at the tuner, since the sweep
radiation is often picked up on the
lead between these two points.)
Such a filter is not effective in preventing local -oscillator radiation into
the antenna-which can be remedied only by proper shielding or
thorough realignment of the tuner.
Repairing and Maintaining
TELEVISION
and FM TUNERS
SEMICONDUCTOR DEVICES
,;(+~'
BROADCAST
EQUIPMENT
AIR
TRIMMERS
Receivers
Filtering may also be of some
help in reducing interference to receivers within approximately 20' of
the radiating set, but more satisfactory results can be obtained by finding and eliminating the cause of excessive radiation. As has been stated
previously, the usual cause of radiation is lack of shielding. The first
step to take, after the type of radiation has been determined, is to
check all shields for poor grounds
and connections.
If the set was designed in compliance with the FCC regulations
stated in this article, it should not
be necessary to redesign the shields
or devise additional methods of
compensating for radiation. However, replacement of all shields and
all grounding screws is a must after
every service call. Remember, it's
up to service technicians to maintain TV sets in such a manner that
radiation is held within FCC -specified limits.
-
FM RADIOS and
MAGNETIC TAPE
AM/FM RADIOS
Electronic Products of Tomorrow
...
TODAY
\/SARKES TARZIAN INC
east hillside drive
64
PF
1000V
Fig. 4. Filter prevents coupling of in
terference from set into power line.
ELECTRONICS
What is it? You might call it
a principle.
CERAMIC CAPACITORS
T10000mmf
REPORTER/April, 1962
bloomington, indiana
edison 2-7251
Booming sa e! ly trar sister radios and battery -operated toys n ah today's battery market bigger Than
ever. Let is ul RCA Ixstributor put into your ht nds
the tools to capture a bigger share of this business.
Capture a Bigger Share
Of Today's Bigger Battery Market
Here are the new RCA dealer aids to
help you increase your battery business.
RCA COUNTER MERCHANDISER
(A)
Sturdy steel and masonite construction.
Rubber tipped legs. Permits you to stock
a complete line of transistor radio
batteries in one square foot of counter
space. Top shelf offers ideal spot to display your inexpensive flashlight or photoflash batteries.
RCA BATTERY TESTER
(a)
Checks eleven ranges of radio battery
voltages from 1.5 volts to 90 volts, plus
separate 1.5 volt range for the round cell photoflash types.
TESTER DISPLAY
(c)
Sits atop battery merchandiser to create
an RCA Battery Center where you have
all your ba-trry needs in organized fashion: stock, display, testing facilities and
tion-Getting Sales Promotional Aids...
Plus Colorful, At
.IP' BATTEr
iI
Battery -Powered Motion Window
Novel flip-flop motion makes it a perfect show
©Display (E).
piece for store window.
Goodwill Giveaways (F). Neat,
compact litterbags for customers' cars.., with large space for
your store imprint.
customer lierature.
If desired. holes in the top shelf of the
merchandiser permit you to secure tester
directly to your merchandiser (D) for
either cust¢zer or sales clerk use.
Contact your Authorized RCA Distributor today. Find out how you can
put these effective sales tools to work
creating m. -e sales and more profits for
you througl-out 1962.
Literature and Technical Help
(G). Battery Identifier Chart,
Door or Window Decals,
pocket-size Interchangeabiity
Guides, Window Streamers,
Price Sheets-everything you
need to bring in more traffic
and convert it to dollars in the
cash register.
RCA.
ELECTRON TUBE DIVISION, HARRISON, N.J.
The Most Trusted Name in Electronics
TT
by Forest H. Belt
COST -OF -DOING
B U S
John Smith
TV
- Year ending
Dec.
31, 1961
t
Service and Parts Sales
Cost of Parts Sold
8670
2125
Gross Profit
6555
4947
Business Expenses
1608
Net Income
Owner's Withdrawal
3000
Net Business Loss
$
1392
Simplified statement shows
how capital can be lost.
Fig.
1.
We recently undertook a survey of
electronics service companies across the
coùntry to determine how much it costs
them to run their businesses. The result disclosed that many of them are operating with little or no profit margin.
Several of these shop owners are taking
home far more money than the business
nets in a year's time and, in some cases,
this is no great amount.
How can a man pay himself more
than the business nets? Usually, without
realizing it, he dips into his operating
P
L
Statement
Month of March 1962
GROSS SALES:
Set Sales
Parts and Accessories
2759.55
958.67
Service Labor
1438.76
$
f
5156.98
COST OF MERCHANDISE
Sets
s
1942.87
587.30
Parts and Accessories
52530.17
!
PROFIT ON SALES
2626.81
EXPENSES:
Service Salaries
I
excluding owner)
Outside Labor I ant. work)
Rent
Supplies - Ofc. + Shop
Utilities
Phone
Vehicle Expense
Insurance
Taxes, Licenses
I
prorated)
Repairs and Maintenance
Accounting, Banking, Legal
Depreciation
Advertising and Promotion
Interest on Loans
Miscellaneous
$
680.00
85.00
150.00
27.35
73.79
37.69
177.65
77.50
27.54
18.76
26.75
42.00
93.85
26.87
173.67
Net Income
Owner's Withdrawal
Net Profit:
Fig.
66
2.
PF
1718.42
$908.39
600.00
$ 308.39
Profit -loss statement indicates
progress of business.
REPORTER/April, 1962
N
capital. Eventually, this will dwindle into
nothing, and he'll be out of business.
One respondent, realizing his plight,
stated, "I'm living off my capital, and
can't make enough profit to replenish it.
Can you tell me how I am going to
survive as a businessman?" At least this
shop owner knows where he stands. His
problem can be solved. by increasing the
ratio of income to outgo. In other words,
he must take in more money without
spending more
he must reduce the
amount he spends to bring in the same
gross earnings. The amount he spends is
referred to as the cost of doing business.
Anyone who is responsible for the operation of a business should realize these
facts-yet, from the results of our survey, it is obvious that too many selfemployed servicemen just don't know
how to determine where they stand.
A large number of these businessmen
keep inadequate records, while others
have almost no accounting system at all.
Certainly one of the most important facts
about a business is profit
lack of it!
But how can a shop owner tell whether
he is making a profit or not, if he fails
to keep adequate books?
For example, more than one shop had
a record sheet which read something like
the example of John Smith TV in Fig.
1. His last year's gross income was $8670,
and the cost of his merchandise sold came
to $2125, leaving a gross profit of $6555.
From this he had to subtract his business
expenses, which came to $4947, leaving
a net business income of $1608. This
might sound fine, but don't forget, John
Smith has not received any salary yet!
Now, as to his salary -he shows that
he withdrew $3000 from the company
funds-the minimum he could live on.
The business income was only $1608,
leaving $1392 to come from . . . who
knows where? The almost $1400 deficit
must necessarily reflect as a drain on the
operating capital of the business, and
represents a genuine business loss. The
sad thing is: If John Smith doesn't take
the time or trouble to prepare an analysis
like that of Fig. 1 (or have his accountant do it), he has no way of knowing
that he is undermining his own security.
Many factors enter into the art of
making a profit. The service shop must
sell a certain quantity of parts, and perform service for a definite number of
customers, or on a certain volume of sets.
On the other hand, service performed
entails certain costs-servicemen's wages,
shop rent, telephone, test equipment,
-or
-or
E S S
lights, and many other seemingly "unseen" costs which are called overhead. The
shop owner must advertise; he must have
insurance; he needs the services of a
bookkeeper to help keep track of all this;
and by no means last, he needs operating
capital-money to keep the business going
through all these operations.
He uses operating capital to pay for
the expenses of overhead and wages, and
if he fails to get a sufficient return for
his services -one which will replace this
operating capital and repay him for its
use-he cannot make a profit.
The Need
for Records
Our survey disclosed that few servicemen keep records in a form which readily
enables them to determine what it costs
them to run a business. As a result, they
have no idea how much it actually costs
them to stay open for an extra eight
hours, or to make a given number of
service calls. It would be difficult for
them to find what return, if any, they are
getting on the capital they have invested
in test equipment, tools, and shop fixtures. Many do not actually know what
salary they can pay themselves without
taking a part of their operating capital.
What type of information would help
the serviceman recognize any deficiency
in his business activity? A profit -loss statement, such as shown in Fig. 2, is probably the most useful. This can be prepared weekly, monthly, quarterly, or on
any basis which will provide a regular
analysis of costs. From the statement, he
can glean figures which will tell him the
facts of business life for his shop.
He can use these figures to help him
decide if it would be profitable to add
another serviceman or a part-time helper.
Certain income or expense categories can
itemized in a way which permits
checking to see if carrying a certain line
is advisable, or if providing a certain
service is profitable.
be
Developing the P/L Statement
A profit -loss statement can be set up
in many ways, and your accountant can
help you arrange the form which will
most benefit your business. Fig. 2 illustrates a simple statement, and shows the
important figures from which you can
calculate your progress. Such a monthly
statement might show a orofit; some
months it might reveal a loss. Careful
analysis will often indicate the reason
L -L
ir
Servicemen and distributors everywhere are talking
about the hottest -performing electronic antenna
around-the TACO T -BIRD ELECTRA.
And you know what started them talking ... color
TV. Color reception is the ultimate test of an antenna today, and here the T -BIRD ELECTRA's
superior design separates the men from the boys. No
friction noise, no signal flutter, a rifle -sharp forward
lobe, flat response on all channels-and the best
transistor preamplifier in the business (Jerrold -dea few of the reasons why T-BIRD
signed)
ELECTRAs (model for model) are the world's most
powerful electronic antennas. Every element is extra
rugged and put there to work, not just look pretty.
.
TACO
Only TACO, of all leading TV antenna manufacturers, has deep experience in designing satellitetracking and defense antennas, as well as the best
electronic know-how in the business. It's this combination that's making T -BIRD ELECTRA the hottest antenna news today. Add to this the new promotional concept that TACO offers you, and you have
a line that can't be beat. Hot tip: GO TACO.
Shown above :T -BIRD ELECTRA Model G-990-8, list price
$107.20. Other T -BIRD ELECTRAs as low as $78.80.
Unpowered T -BIRD antennas list from $28.30 to $65.05.
77- It1R17
ELECTRA
WORLD'S MOST POWERFUL ELECTRONIC TV/FM ANTENNA
TECHNICAL APPLIANCE CORPORATION,
Dept. JTD-35, Sherburne, N.Y.
A Subsidiary of Jerrold Electronics Corporation
In Canada: Jerrold Electronics (Canada) Ltd., 50 Wingold Ave., Toronto Export: Joseph Plasencia, Inc., 401 Broadway, New York 13, N.Y.
April,
1962/PF REPORTER
67
iAL 1962
NEW
KIND!
-;, t
1962
QUIPMEM*
Radio - TV
G
the most complete,
authoritative guide ever
published on the practical
application of test equipment
132 Pages
Over 100 Illustrations
the most useful, practical, time-saving information on test
equipment ever to
appear in a single
volume!
,,;
FACT-PACKED FEATURES!
So easy to understand-here's
the help you need to increase
your servicing know-how ...here
are the latest techniques developed
by the experts for your benefit.
Partial List of Contents:
UNIQUE
BUSINESS SECTION
Here's the money -saving information you need to help
you buy and use test equipment to best advantage:
How to Get More Mileage From Your
VOM and VTVM
How to Interpret
Tube Tester Readings Using a Scope
Effectively
Circuit Analyzers Cut
Troubleshooting Time Choosing Your
Color TV Equipment
Making Two Way Transmitter Measurements
Using Component Testers and Substitutors to Advantage The Versatility
of Pulse Generators
Using and Understanding Probes Radiation Detection and Measurements
Transistor
Testers-What They Do and How They
Prorating Your Equipment for
Tax Deductions
When Should You Buy New
Equipment
Kit or Factory-Wired-How
to Decide
He Owns a TV Shop-On
Wheels!
SPECIAL! TEST EQUIPMENT
BUYER'S GUIDE
Lists complete specifications for
virtually every instrument available through parts distributorsespecially planned to help you
choose just the instruments you
need in your work. Instrumentsare
listed by category with informative tips preceding each group.
Do It.
DON'T MISS THE 1962
MENT
TEST
ORDER YOUR COPY TODAY
CONVENIENT VOLUME!
HOWARD W. SAMS 8 CO., INC.
16-PAGE
BOOK SECTION
Gives you all the facts you
need to take the guesswork
out of using signal genera-
tors-written
by Bob
Middleton, the dean of test
equipment authorities.
Order from your local parts distributor, or
mail to Howard W. Sams & Co., Inc. Dept.
1720 E. 38th St., Indianapolis 6, Ind.
68
PF
REPORTER/April, 1962
$150
7-CC -3
Please send me
copy(ies) of "Test Equip ment Annual"
My (check) (money -order) for
enclosed.
Name
Address
City
YOU GET ALL THE FACTS!
EQUIP-
ANNUAL-it's packed with lab -
proved test equipment information and
latest servicing techniques to make
your work easier, more profitable!
HERE'S YOUR TEST EQUIPMENT
BUYING GUIDE IN ONE
Zone
State
(outside U.S.A. priced slightly higher)
Both
8
675.85
947.50 1623.35
Two -Way Radio
586.90 1312.80 1899.70
Appliances
873.00
TOTALS:
«w
Service
GROSS SALES:
Test E quipmentAnnual
PUB LICATI
OF ITS
Parts
757.60 1630.60
$2135.75 3017.90 5153.65
Fig. 3. Sales breakdown into departments aids cost analysis.
for any loss, and perhaps suggest a
remedy. If losses continue over an extended period, it is time to change something about your way of doing business.
Gross sales represents the business income from all sources. If your shop does
not sell sets, you would omit that category
from the sheet. One business, which
specializes in several types of service,
prefers to divide the sales figures among
various departments, as in Fig. 3. From
this, the manager can see what portion
of gross sales is derived from each. His
overhead expenses can be divided proportionately to show whether or not a
department is carrying its own weight.
Returning to Fig. 1, the Cost of Merchandise can be determined in either of
two ways. The actual cost of each item
sold can be listed on the shop copy of the
customer invoice and the totals of these
figures combined in the P/L statement.
This method, however, can become very
time-consuming.
The alternate method consists of applying a cost factor to the merchandise
sales figures. This factor is derived from
the average cost of items held in inventory. To illustrate, suppose the inventory
contains $2000 worth of items which
were purchased at 60% of list price,
$3000 worth of goods at a 50% discount, and $1000 worth of merchandise
which was discounted to 70%. The average factor is computed by adding the
factors in proportion (per $1000) and
dividing by the total of proportionate
factors-.6(2) + .5(3) + .7(1) = 3.4,
divided by 6 = .567. This factor, when
applied to the gross merchandise sales,
will indicate the approximate cost. Thus,
the cost of merchandise for $1500 worth
of parts and accessories would be about
$850.50 ($1500 x .567).
Expenses can be computed from monthly bills as they are paid, or from check
stubs. The totals can be added and entered on the profit -loss statement as the
monthly expense for each category.
Service salaries should exclude the owner's salary if the business is a proprietorship or a partnership. If the business is a
corporation the manager's salary must be
included. The reason for this differentiation is because net taxable income of a
proprietorship must be figured before the
owner(s) withdraws any money from the
business. In a corporation, the taxable
corporate profits are computed only after
all personnel and officers are paid. Clerical or office help can be included with
service salaries or else placed in a separate category with other nonproductive
salaries.
What's the difference in loudspeakers
that makes Quam so special?
All loudspeakers look pretty much
alike, and may even sound pretty
much alike-yet Quam speakers
are different-in a way that's very
important to you who use them!
the
difference
lies
in
PERFORMANCE
RELIABILITY
When it's
a
Quam speaker-you
install it and forget it. Quam
speakers are built to give long,
trouble -free performance.
Quam's factory is
a manufacturing
plant, not merely an assembly
shop. By making our own speaker
parts, we can guarantee the quality
of the materials that go into them.
Our voice coils are centered precisely; each and every speaker is
thoroughly tested; the product you
get meets the standards we have
insisted on for almost forty years.
Quam Quality Line speakers are
enameled in gold-and while the
color has no effect on performance
characteristics, it symbolizes the
quality and reliability that's built
into every Quam speaker.
ASK FOR
UAM
THE QUALITY LINEfor all your speaker needs
QUAMNICHOLS
COMPANY
234 East Marquette Road
Chicago 37, Illinois
April,
1962/PF REPORTER
69
LIMITED OFFER
Service -Call Income - 180 calls @84.00
720.00 or approx 1/7 of gross
EXPENSES
(p
means prorated)
Serviceman Salary
Rent
$
(p)
Supplies
for unlimited servicing profit
-01%,.
AUDIO
AMPLIFIER
- -o-o
INPUT
OUTPUT
o
I
o
For a full service, ultra reliable yet compact
wave generating source, the Jackson Model
605 Audio Sine/Square Wave Oscillator is your
best answer. Provides both sine and square
wave output for accurate checking of distortion,
voltage, gain and frequency response of ampli
fier circuits. Range 20 to 200,000 cycles in
four push button selected ranges. Continuously
variable output. A Professional Quality instrument. $129.95.
kkSOII
ELECTRICAL INSTRUMENT COMPANY
124 McDonough
St., Dayton, Ohio
$5.00 SAVINGS COUPON
This coupon and $29.95 will add the Jackson 606
Square Waver to your service profit potential.
Take this coupon to your Jackson Instruments
dealer, or mail direct to Jackson Electrical Instrument Company, 124 McDonough Street, Dayton 2,
Ohio.
606
NAME
FIRM
ADDRESS
DEALER
DEALER ADDRESS
THIS OFFER GOOD THROUGH JUNE 15, 1962
70
PF
REPORTER/April, 1962
p)
$
3.32
597.00
cost per call
Fig. 4. Service -call costs are determined
From P/L statement.
RES
OUTPUT
(
S
180 calls
LOAD
INPUT
p)
Interest &Misc. (p)
AUDIO
o-
(
(pl
Adv. & Promotion
OSCILLOSCOPE
OUTPUT
p)
Acct., Bank, and Legal
OFFER-$29.95
MODEL 606
SQUARE
WAVER
one truck)
(
Depreciation
JACKSON 606 SQUARE WAVER $3
OSCILLATOR
(
Taxes &Licenses
Repairs &Maintenance( p)
TRUE SQUARE WAVE OUTPUT FROM YOUR
PRESENT OSCILLATOR AND SCOPE
Reduce amplifier analysis time to one minute with
a simple high and low range frequency response
reading. The 606 gives true square waves coupled
with your present sine wave generator. Square wave
shape is independent of the driving source wave
shape, and covers the full frequency range provided
by your present driving generator.
SPECIAL
Utilities & Phone (p)
Vehicle Expenses
420.00
21.00
5.00
16.00
75.00
4.00
3.00
4.00
6.00
14.00
29.00
Outside labor includes money paid to
another company for services rendered,
for which a customer was charged. Antenna work often falls into this category,
since many shops "farm out" this work
to specialists. Sometimes an electrical contractor is hired to pull wiring for an intercom system; this would be ouside labor.
Office and shop supplies can be grouped
together. Shop supplies include items such
as solder, tape, hookup wire, or any material for which the customer is not
charged directly. Office supplies normally
means stationery, pencils, postage, paper
clips, and similar material.
Vehicle expense covers gas, oil, tires,
and normal service expense connected with
the company vehicles. The vehicle insurance and major repairs are usually placed
in the insurance and repairs and maintenance categories.
Insurance includes any coverage of risks
entailed in normal business operation. The
premium is usually billed on a per-year
basis, and you must divide this figure by
12 to arrive at your monthly insurance
cost.
Taxes and licenses are always on a
yearly basis, and the monthly amount can
be computed as described for insurance
premiums. Licenses include any city,
county, state, or federal permits or fees.
Taxes include federal excise taxes on purchases, sales tax on items bought for business use, corporate taxes and fees, and
payroll taxes.
Repair and maintenance costs, whether
for test equipment, buildings, vehicles or
shop and office furniture, are listed in this
category.
The accounting, banking, legal category
is self-explanatory. Fees of the agency
who collects your delinquent charge accounts are included.
Depreciation is that allowance which
permits you to set aside a part of your
capital assets each month as "used up."
As a piece of test equipment (or a truck)
is used and grows older, it becomes less
valuable to the business. This depreciation
of value can be claimed as a business expense, and must be included in the profit loss statement.
If you borrow money, the interest you
STA -LOC Control Kits
now more versatile than ever
Here's the new Mallory STA -LOC Control Kit. It's
better than ever now. All we did was shuffle a few parts
around to really bring it up-to-date. Now you can make
exact replacements for hundreds of jobs ... TV, Hi-Fi,
stereo, home and auto radio ... singles, duals, tandems...
even clutch controls ... all with or without a line switch.
STA -LOC controls snap together ... and stay together.
Best of all, you can snap a rear section on in any of
three positions ... so you can fit those tough auto radio
jobs. The whole STA -LOC system is slick. It's designed
for you ... the service technician.
There are two STA -LOC kits. The small SLD-IA covers
over 200 dual combinations, 300 tandems, and scores of
singles. The big SLD-2A handles over twice as many
jobs. Both kits come complete with cross reference
guides and instructions. And they're inexpensive.
You'll save time, phone calls, and extra trips to your
distributor. Here's a real plus ... Your Mallory distributor has complete back-up stock for your STA -LOC kit
...you can even switch it around to fit your needs
exactly. Give your Mallory Distributor a call ... let him
give you the details on the best doggone control system
ever made for service technicians.
STA -WC. U.B. Patent 2,958,838.
Top
47'6
Distributor Division, Indianapolis
6,
Indiana
MALLORY
April,
1962/PF REPORTER
71
SAMS BOOKS
INTRODUCE YOU
ESTIMATED MONTHLY ADD'L COST
Utilities
TO
Supplies
NEW FIELDS
Vehicle Expense
Miscellaneous
available from your Sams Distributor)
R
&M,
A -B -L,
Depreciation
Additional Promotion
Salary & Payroll Tax
I
255.50
ABCs of Computers. Tells what computers
do and how they operate. Explains analog
and digital types, binary numbers, circuitry,
memory devices, arithmetic functions, symbolic logic, input-output devices, programming, etc. 128 p., 5%x8%".
$1.95
No. ABC -1, Only
ABC's of Radar. Comprehensive, easy -to -
understand explanation of radar: principles;
how it works; uses; types of radar systems;
microwave; antenna systems; receivers; indicating systems; timers and modulators, etc.
p., 61/2x8%".
$1.95
No. ABR-1,
AR -1, Only
ABC's of Mobile Radio. Basic introduction to
systems and equipment used in today's booming field of 2 -way mobile communications.
Provides a clear understanding of the principles and equipment used. 96 p.,
$1.95
51/2 x 81/2". No. AMR -1, Only
ABC's of Ultrasonics. The fascinating story
of how sound waves above the normal audible
range are being used to perform jobs ranging from cleaning tiny watch movements to
huge missile cases, homogenizing milk, measuring thickness and depth, locating schools
of fish, etc. Describes theory and equipment
used. 96 p., 51/2x81/2".
$1.95
No. ULT-1, Only
ABC's of Missile Guidance. Easily understandable book on the principles used to
guide today's missiles and rockets. Covers
development, propulsion techniques, guidance
fundamentals and systems, etc. 96 p., $1.95
51/2 x
81/2". No. GMS-1, Only
,,ODII
cos(,nn
ABC's of Electronic Organs. Explains theory,
development, features, and operation of electronic organs, circuitry used, how to main-
tain and troubleshoot these instruments.
96
p., 6 % x 8 1/2 ".
$1.95
No. ECO -1, Only
ABC's of Model Radio Control. Gives you an
understanding of this popular hobbyist interest-the radio control of model planes,
cars, boats, etc. Explains radio control principles; describes equipment; how to build,
install, and use it. 96 p.,
$1.95
81/2". No. MOR -1, Only
ABC's of Ham Radio. All you need to know
51/2 x
to qualify for the ham novice license. 10
chapters include typical exam questions; the
radio code; the transmitter; radio power
supplies; measurements; regulations; exam
procedures-right down to "You're On the
Air1" 112 p., 51/2x81/2".
$1.50
No. HAP -1, Only
ABC's of Tape Recording. Provides a clear
understanding of how tape recorders work
and how to use them to best advantage for
pleasure or business. Includes many unique
tape recorder uses. 96 p., 6 %x81/2 ". $1.50
No. TAP -1, Only
ABC's of Transistors. Tells in practical language the function of the transistor in today's commercial circuits. Covers transistor
fundamentals, physical construction, basic
circuits, transistor amplifiers and oscillators,
temperature considerations, testing and servicing facts. 96 p., 51/2 x 81/2".
$1.25
No. TRA -1, Only
FREE
Sams Booklist describing over 150
important books. Available from your Pis
us direct.
New
tributor or write
HOWARD W. SAMS & CO., INC.
1720 I. 35th St., Indianapolis 6, Ind.
In Canada: A. C. Simmonds & Sono, Ltd., Toronto 7
72
PF
REPORTER/April, 1962
Fig. 5. Using
SUMMARY
four extra days)
12.00
1.50
35.00
35.00
17.00
30.00
125.00
To make 17%
profit
-$310.00
additional
business.
78 service calls - impossible
- or -
$1000 worth
of extra sets - possible
- or 30 service calls and $650 worth
of extra sets - possible
profit-loss figures to evaluate future plans.
pay on the loan can be considered as a
business expense, and is listed as such.
Your banker or your accountant can
give you specific details on how to compute this interest, since this is a highly
specialized field and sometimes loan
charges are difficult to analyze.
The miscellaneous category is a "catchall" under which you can list any item
not covered in a regular account. Such
things as travel expenses to and from a
service meeting, a magazine subscription,
or membership dues in the local servicemen's organization are expenses which
logically fall into this category.
Using the Information
Now you can use all this information
to compute various cost factors of your
business. For example, suppose you are
interested in how much it costs you to
make a home service call. The costs include salaries, service vehicle expense,
and proportionate parts of all overhead
expenses. Fig. 4 shows a tabulation of
these various expenses, some of them
prorated.
The relationship for prorating is established by comparing the income from
service calls with the total income. Since
over-all income (in Fig. 2) was around
$5000, and service-call income for the
month was slightly over $700, about 1/7
of overhead should be charged to service
calls.
To develop the analysis shown in Fig.
4, each expense item must be considered.
Only one serviceman makes outside calls,
so his is the only salary applied. Certain
expenses are peculiar only to service
calls, such as truck expense. As you can
see, certain expenses remain fixed, while
others fluctuate with the overhead of the
business. The point is, your service -call
charge should be sufficient to cover expenses and leave a reasonable profit for
the business.
In the example of Fig. 4, the profit is
68¢ per $4.00 service call, or 17% of
gross; 15% is usually acceptable. If no
profit is evident, it is up to you to decide if your service charges are wrong,
the volume of calls being handled is too
small, or if expenses are too great. In
this way, the P/L statement both helps
you find a fault and assists in planning a
way to eliminate it.
Stay Open More?
Suppose you wondered if it would be
wise to keep the store open an extra day
each week, and perhaps handle extra
service calls. Things to consider would
be: added utility expense, extra advertising, and additional salaries. Salaries
might involve overtime pay, or maybe
just adding a part-time man; in both
cases, additional payroll taxes will be
involved. If service calls will be made,
vehicle expense is added.
To offset this additional expense and
provide a profit, you must know just how
much extra business you need. So you
consult your P/L statement (Fig. 2)
again. Let's examine utilities-they have
been costing about $3.00 per working
day, so this figure can be used as a basis
for preparing the estimated cost sheet in
Fig. 5. Similar proportions are used in the
estimates of other current expenses. All
expenses which would increase must be
included if the shop were kept open four
extra days each month.
A fair profit must be added to the total expense figure. (What reason is there to
stay open, if not for a profit?) The
summary in Fig. 5 demonstrates that it
would be a losing proposition to stay open
for service calls only, but it might be
possible to sell enough sets to make it
worthwhile. Don't forget, when figuring
the profit on sets, to subtract the cost of
merchandise from the sale price; then you
can figure your profit by deducting expenses from profit on sales. If a normal
quota of service calls can be obtained, it
is easy to see that nominal set sales will
make staying open profitable. This is a
break-even point; additional service calls
or more set sales will simply add to the
profit percentage, provided no further expenses are entailed.
Of course, the owner can now have
an additional withdrawal for "keeping the
store," and this is included in the 17%
profit; in fact, about 11% is the owner's
normal withdrawal. So, in the example
of Fig. 5, the owner could add approximately $35 extra to his monthly withdrawal. In all of this planning, the P/L
statement is his guide.
From these examples, you see by now
that you can use your profit -loss statement to chart your progress or your
decline. If you are faced with the latter,
it is time to analyze the business and
make some changes. If you are aware of
your cost of doing business, you are in
an excellent position to do something
about your fate as a businessman, and you
can find ways to pay yourself a better
wage.
TUBE -TYPE and
TRANSISTOR -POWERED
,
e
celfer.t
one, ensitrvity, and Volume.
L.
"the oldest name in auto radio
ime, with
xE
FINGER-TIP TONE CONTROL
HAND WIRED-NO PRINTED CIRCUITRY
EQUIVALENT 8 TUBE PERFORMANCE AUTOMATIC VOLUME CONTROL
UNIVERSAL Karadio
UNIVERS4L Karadio
39
39
$
9LIST PRICE
PRICE
LIST95
MODEL 400 SERIES. Easily installed in -dash or under -dash. Su-
MODEL 600 SERIES. Easily installed
in -dash or under -dash. Amplifier/
power supply chassis may be sepa-
perheterodyne circuit utilizing 4
tubes (two dual purpose tubes)
together with two transistors
pulls in those distant stations with
good tone and volume. Supplied
with separate 5" x 7" speaker.
rated from tuner chassis for installation flexibility and easy servicing.
Utilizes 6-tube superheterodyne clr.
Cuit (two dual purpo ae tubes) with
8 -tube performance ... pulls in those
distant stations with good tone and
volume. Supplied with separate 5" x 7" speaker,
.
FULL CUSTOM Karadio
LIST9Q
TRUCK Karadio
$59 95
UTILIZES MODEL 400 SERIES designed specifically for 1960-61-62 Ford and
Falcon cars. Blends perfectly with dashboard same as original equipment. Supplied with 6" x 9" speaker.
FULL CUSTOM Karadio
MODEL TR -1279. Easily
installed in cab of truck or
boat by simply drilling one
(1) hole. Overhead mourning adds extra safety in
driving. Has built in
'44. 95
ST PR CE
UTILIZES MODEL 400 SERIES
designed specifically for 1961 and 1962 Chevrolet. Blends perfectly with dash.
board same as original equipment. Supplied with 6" x 9" speaker.
Customized Karadio
MODEL TRI -c-1279 SERIES. Easily
installed in -Cash or under -dash. Has
Self -container speaker and 6 -tube
JUST THE THING
PERFECT FOR
TRUCKS
fit most Import
Cars
Illustrates ATR CUSTOMIZED Karadio
utilizing Model 600 Series and deluxe
trim plate mounting for Falcon. Many
model CUSTOMIZED Karadios are avail.
able in Model 600 series. 400 series, or
TR/K-1279 series permitting maximum
installation flexibility.
e^'e.lr
FOR COATS
superheterodyne circuit with 8 -tube
performance... pulls in those distant stations with good tone and
volume.
to
'4g95L
speaker and utilizes E.
tube circuit as above. Perfect for all trucks.
UNIVERSAL Karadio
J
PRICE
r.
es low as
$45.95 Complete
LIST PRICE
\ Compact U.S. Cars and Standard U.S. barb
READ and COMPARE!
Read why ATR KARADIOS provide the
highest value and per`ormance at the lowest
cost, giving utmost cjlstomer satisfaction
&
I
rucks
ATR UNIVERSAL Karadio
400 SERIES. Transistor -Powered
4 Tubes
2
Transistors
RF Stage
Tone
Control
Brand A
2 Tubes
2
Transistors
None
None
Brand
B
3 Tubes
2
Transistors
None
None
Brand
C
3 Tubes
2
Transistors
None
None
Transistor -Powered
Transistor -Powered
Transistor -Powered
he above UNIVERSAL type sets bei g compared are all Tran
istor-Powered types
taxing suggested selling price $39.95.
Note the extra value o the ATR KARADIO
providing extra RF
stage and variable tone control providing top performance, and
maximum distance reception. In addition ATR
KARADIO is supplied with a separate
x 7" Speaker giving high fidelity tone, and maximum volume.
QUALITY PRODUCT'S SINCE 1931
ATR ELECTRONICS, INC.
°Trademarks of ATR Electronics, Inc. Regidtered in the U.S. Patent Office.
4th St.
St. Paul 1, Minn.
300
E.
SEE YOUR ATR KARADIO DISTRIBUTOR
OR WRITE FACTORY FOR COMPLETE IN-
FORMATION.
FRANCHISE TERRITORI ES AVAILABLE FOR
AUTO RADIO SPECIALISTS. ACT NOW!
April, 1962/PF
REPORTER
73
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Servicing Industrial
Electronics
by
R. H. McDonald
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Sound waves are produced by
mechanical vibrations over a frequency range that extends far beyond the limits of our hearing. The
inaudible sounds in the ultrasonic
region, above 20 kc, are put to good
use in industry.
Ultrasonic cleaning is one of the
best known applications of ultrasonics. This method of cleaning is
used in almost every kind of manufacturing, and has proved successful
in cleaning grease, oil films, metal
chips, and corrosion from intricate
mechanisms. It is ideally suited for
irregular shapes and forms that are
hard to clean by other methods.
The output of an oscillator unit is
applied to a transducer which
converts it into mechanical
Vibrations of the same frequency.
Ultrasonic vibrations remove contaminants from cracks, undercuts,
and blind holes inaccessible by any
other means. In many cases, complex assemblies need not be disassembled before cleaning, thus reducing labor costs and time by making it possible to use automatic
cleaning methods.
This cleaning action of ultrasonics
works on the erosion principle. The
cleaning liquid is placed in motion
by a transducer, resulting in a scrubbing action. However, the mere
presence of high -frequency energy
does not necessarily produce cleaning. This action results from "cavita-
/
0 0
i
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0
'
/
1
1
These vibrations --ultrasonic
energy --are then transmitted
into the cleaning liquid .
V
tion" of the cleaning liquid. Cavitation is the rapid formation and sudden collapse of countless thousands
of microscopic bubbles in a liquid,
generated by transmitting ultrasonic
vibrations through the liquid (Fig.
1) The implosion or collapse of
these bubbles during the pressure reduction part of the cycle pulls dirt
and other contaminants free from
the parts immersed in the liquid. A
solvent dissolves grease and soluble
oil, while a detergent holds in
suspension the dirt torn free by the
ultrasonically -generated cavitation.
.
The Ultrasonic
Generator
The generator used in ultrasonic
cleaning draws power from the 60 cps power line and converts it to
useful output at the resonant frequency of the transducer. The generator is basically an oscillator; for
a typical circuit, see Fig. 2. The output -power ratings of generators
cover a range from about 60 watts
in the small sizes used in laboratories (Fig. 3) to many kilowatts in
sizes used for cleaning large parts
in volume. These generators are
usually rated at both average power
output and pulsed power output
(four times average) The output
of the generator excites the transducer, which expands and contracts
at the same frequency to generate
the ultrasonic vibrations and thereby
couple the ultrasonic energy into
the liquid.
Another measure of energy is in
terms of watts per gallon. 25-30
watts per gallon represents about
the mimimum requirement for ultrasonic cleaning.
In most cleaning applications, 40
kc is an optimum operating frequency. Adequate power levels, a
.
This results in cavitation, the
for mation and collapse of
millions of microscopic bubbles
in the liquid.
The collapse of these bubbles
results in a powerful scrubbing
action.
Fig.
74
PF
1.
An ultrasonic cleaner loosens dirt by means of cavitation in liquid.
REPORTER/
April, 1962
laf
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BETTER THAN EVER IN ITS 32nd YEAR
Philco part or tube that you install and the original Philco
instrument that she purchased. To us, the most important
is satisfied.
and ours
fact is that your customer
That is why we refuse to relax the quality standards for
every product, every tube, every part sold by Philco. That
is one reason we believe every replacement part should
meet original factory specifications. Your Philco Distributor makes it especially easy for you to use and order the
right tube or part, by offering a service data program and
maintaining complete stocks of Philco tubes and parts.
When you insist on a Philco STAR BRIGHT 20/20 Picture
Tube or Philco Receiving Tube, you're sure of unbeatably
high quality. There are many technical reasons why-but
the most fundamental reason behind the Philco Pledge of
Quality is Philco's own reputation-and the fact that we
consider the service technician as our most important
tube customer.
Everything that Philco makes or sells reflects on the
proud reputation that we have tried to build throughout
the years. Your customer makes no distinction between the
See Your Philco
Distributor
...
...
... He's the Best Friend
and Partner Any Serviceman Could Have!
Double Protection-both Bond and Warranty
BRIGHT 20/20 Picture Tube
re -use, is inspected and tested to the same
Every Philco STAR
is Bonded to be made only from new parts and
materials except for the envelope which, prior to
PARTS
&
SERVICE OPERATIONS
PHILCQ
A
SUBSIDIARY OF
C/Kvicrr 9,on0
/ny,
standards as a new envelope. Plus the standard
Philco full year Warranty on picture tubes.
Want
Additional
Service
Information?
MAIL
THIS COUPON
TODAY
Philco Parts & Service Operations
,
Dept. C.4
2nd and Westmoreland Sts., Phila. 40, Pa.
Please send me the latest Free technical information and my complimentary copy of the Philco Service -Businessman magazine.
Name
Address
State
City
Service Only
Retailer with Service Dept.
Just Off the Press! New Philco Electronic Parts Catalog! Ask Your Philco Distributor for Your Copy Today!
I. F. TRANSFORMERS
OSCILLATOR COILS
and LOOP ANTENNAS
¡o/.. JJtwz&iátoh. $o!A.
GENERAL REPLACEMENTS FOR
IMPORTED and DOMESTIC SETS
Size 3/e"
455
-Al
3/e"
INPUT
INTERSTAGE
OUTPUT
OSCILLATOR
455-A2
455-A3
455 -OA
'/4r'x'/4'r
Size
NO.
PART
%
OPERATION
NO,
PART
OPERATION
455-B1
INPUT
INTERSTAGE
OUTPUT
OSCILLATOR
455-B2
455-83
455 -OB
Packaged in Plastic SeeThru box in display carton with instruction.
MODEL LA -14
Fig. 2. An oscillator circuit typical of those used in ultrasonic cleaners.
WITH
148 MMFD.
TUNING
FOR USE
CONDENSER
SIZE
MODEL LA -36
MODEL LA -21
WITH 365 MMFD.
TUNING CONDENSER
-
211 MMFD.
TUNING CONDENSER
FOR USE WITH
SIZE
FOR USE
-
SIZE 2-13/16x11/16
2-5/16x11/16
Packaged in plastic bag on display card
idaire
ELECTRONICS MFG. CORP.
ROOSEVELT, N. Y.
365 BABYLON TPKE.
New
-
fffaiS/ Perfect
Pin Crimper
Picture-Tube Repair Tool
Also for -5U4, 65N7, 6BQ6, etc.
Eliminates that hard
soldering job
s
only $1.25
Pi -1
3/32" PIN
each
Fix
loose
pin connec-
seconds. Pays
for itself in time saved
on first job. 3" long.
tions in
Patented
Intermittent operation of picture tubes due
to defective solder connections easily corrected. Provides solid electrical connections,
can also be used as channel - selector
wrench and screwdriver. Pin keeps its
original form. A 3 -in -1 tool.
3 MODELS
ELIMINATE SOLDERING
Makes Solid Electrical Connections
Phono Pin-Plug Crimper
Slip wire in "pin
plug," insert
in tool, and
squeeze
job is done.
...
r
C
LC -3
AU -2
1/8" PIN
Use
for 3/32" pin diameter
At your parts distributor or write
NS
76
PF
us
Mfg. Co.
9853 Chalmers,
Detroit 13, Mich.
REPORTER/April, 1962
ably the most frequently - used
method for generating ultrasonic
energy and offers a means for generating the highest frequencies.
The brothers Curie discovered in
1880 that many crystals, when sub-
Transducers
There are two basic methods of
converting electrical power to mechanical power in an ultrasonic
cleaner. The piezoelectric method
utilizes the property of certain crystals and ceramics to change shape
when an electrical potential is applied to them, and the megnetostriction method depends on the ability
of certain metals, such as nickel, to
change dimensions when magnetized.
Piezoelectric Generator
The piezoelectric effect is prob-
Fig. 3. Sonogen laboratory -type ultrasonic unit used to clean small parts.
Western T. V. Tuner Rebuilders
VHF
-rings lc ea.
end of
tool to push
on C -ring for
ground connection.
Ant. plugs, hi-fi, multiple plugs, public
address, radio and TV tubes, radar, speakers,
and loop connections. Many, many more uses.
Model
high percentage coverage of the
tank, and low noise levels can be
achieved at mimimum cost. For
certain applicatons in which higher
power is desired, especially in cleaning parts of large mass, and where
a higher noise level is not objectionable, 20 kc is a recommended frequency.
or
UHF ALL MAKES
Including all parts
and labor
major parts extra at howl net price.
UHF -VHF COMB. $17.50
24 Hour Service
90 Days Guarantee
-
All tuners are thoroughly cleaned, mechanically and electrically overhauled, aligned with
crystal -controlled equipment, and finally given air check for sensitivity with TV transmitters
located in Los Angeles at 5,000 feet height and 120 mile distance from us.
TRANSISTOR RADIOS REPAIRED
i0
\...-----\
i
Standard-$4.75 plus parts
Shortwave-$6.75 plus parts
A.M. & F.M.-$7.50 plus parts
WESTERN TUNER REBUILDERS
4030 W. Sunset Blvd., Los Angeles,
Calif.,
NO 2-1397
4130 El Cajon Blvd., San Diego 5, Calif., AT 4-2733
For stronger... clearer
TV reception
There's a Belden Lead-in Cable
for every requirement
2
0r ons
t{,rF[_ß
822`.>
STANDARD 300 -OHM
LINE-
Offers low losses at high frequencies. For use with TV
and FM receiving antennas.
CELLULINE
t 300 -OHM LINE-
Resists abrasion, sun, and
wind. Provides strong UHF
and VHF TV pictures.
WELDOHM
Provides
t 300 -OHM LINE21/2
times the
breaking strength of ordinary lead-in cable.
8226
DECORATOR LEAD-IN 300
only.
For
interiors
OHM LINEReplaces unsightly cables.
-
*Belden Trademark and Patent
Belden
WIREMAKER FOR INDUSTRY
SINCE 1903- CHICAGO
..
U.S. Patent No. 2782251
Power Supply Cords Cord, Sets
Portable Cordage Electrical
Household Cords Magnet Wire
Automotive Wire
grad Wire
rid Cable Aircraft Wires
Welding Cable
Neutral color blends into
room's decor.
iffleemempimmtirmai
_7a
STANDARD 72.0HM LINECan be used with all types
of receiving antennas at high
frequenc es.
Permohm conductors are encapsulated in cellular polyethylene. This exclusive 300 -ohm line design provides
clearer TV reception in all areas, including areas where
conditions of extreme salt spray, industrial contamination,
ice, rain, or snow are experienced. It further improves
fringe area pictures on all channels, as well as strengthening
UHF and color TV transmission. Ask your Belden Distributor about this improved 300 -ohm cable. Permohm is
available in packaged lengths of 50, 75, and 100 feet, and
in 500- and 1000 -foot spools.
STANDARD
150 -OHM
LINE-
For receiving antennas.
matching transformers, and
experimental applications.
Belden Cable is Packaged
in Standard Lengths for
Display and Handling.
g.5_1
t Belden
Trademark-Reg. U.S. Pat. Off,
April, 1962/PF
REPORTER
77
jected to pressure or tension in certain directions, developed electric
charges on definite surfaces. Conversely, applying electricity to a
crystal through driving electrodes
causes distortion of the crystal.
(Further details are presented in
Fig. 4.) This piezoelectric effect is
observed in such crystals as tourmaline, quartz, zinc blend, sodium
chlorate, tartaric acid, cane sugar,
and Rochelle salt.
If a piezoelectric quartz plate is
placed in an alternating electric
field in such a manner that the direction of the field corresponds to
the direction of the piezoelectric
axis, the quartz will be compressed
during one half -cycle of the field,
and expanded the same amount during the other half-cycle. It will
thereby be set into elastic oscillations of the same frequency as the
field. The resulting amplitudes will
be at a maximum when there is
resonance between the applied field
and the natural mechanical frequency of the crystal plate. The
resonant frequencies of the crystals
can be tuned very sharply.
Although the most widely -used
crystal for utilizing the piezoelectric
effect has been the quartz crystal,
artificially - produced ceramics are
replacing natural crystals because
they can be manufactured to provide specific characteristics and in
any practical size.
Crystals composed of ceramics
are generally used for transducers
in ultrasonic cleaning. This has
proven to be one of the most economical and satisfactory means of
activating the cleaning liquid. Synthetically produced of barium titan ate, the material is easily formed
during manufacture into the most
efficient shapes to provide the relatively large radiating areas required.
Barium titanate transducers, when
operated in the 40-kc range, also
NEXT BEST
THING TO
THE
WINEGARD ELECTRONIC
POWERTRON TV
ANTENNA
NEW
TRANSISTOR TV -FM
WINEGARD
TENNA BOOST
Exclusive Gain
INSTALL IT
... FORGET
IT
!
/ Control Switch
19 DB
GAIN!
CUTS
SNOW...BOOSTS SIGNAL!
Now you can make any TV or FM
antenna work better by magnifying
signals with the new Winegard tran-
ALL ELECTRIC, ALL -AC POWER
SUPPLY costs less than 27c a
year to operate. Many exclusive
sistor Tenna-Boost.
Tenna-Boost has up to 19 DB
gain, no peaks and valleys. Ultra low
noise. Linear frequency response.
features.
No costly, nuisance batteries!
VSWR input better than 1.5:1
across all frequencies. Output
Built-in two set
coupler.
AC outlet on
power supply.
VSWR 1.8:1 or better. This fine
frequency response plus the very
low VSWR make Tenna-Boost excellent for color.
Winegard's exclusive input bandpass filter eliminates interference
from citizen's band, Hams, garage
door openers, etc. Only TV and FM
signals are amplified.
All metal parts are anodized, irridized or stainless steel. Completely
weather-proof, trouble -free. Install
it .. forget it.
There's a big difference in antenna
amplifiers! Ask your distributor or
write for technical bulletin.
W*
FOR THE ULTIMATE IN
TV RECEPTION
Winegard Transistorized Electro
Powertron TV Antennas. 3 Mod
to Choose From.
3009-4B Kirkwood
Burlington, Iowa
For the Ultimate in
FM and FM Stereo
Reception
Winegard
FM ANTENNAS
No matter how sensitive an FM tuner or
set is, it's no better than the antenna to
which it is connected.
With a good FM antenna, you can
receive both nearby stations as well as
stations up to 200 miles away. Add a
Winegard FM antenna to your receiver
for the finest high fidelity sound modern
electronics can provide. Choose from the
complete Winegard line of GOLD ANODIZED and aluminum FM antennas.
ELECTRONIC FM ANTENNAS
AREAS-
FOR FRINGE
Most Powerful FM Antennas You Can Own
This special type of ultrasonic cleaning system is used for decontaminating parts
which have been exposed to radioactivity. Since the contamination is in the form of
dust and other surface particles, the cleaning is generally quite effective.
In this National Ultrasonic Corp. equipment, a recirculating pump and filter (shown
just in front of the main cabinet) removes solid contamination from the cleaning soluwhich is then circulated back through the cleaning tank.
tion
-
THICKNESS MODE OF A CERAMIC PLATE
IDRIVING HELD
POLARIZATION
LECTRODES
n)
`
MOTION
RADIAL MODE OF A CERAMIC DISC
'
POLARIZAT ON
DRIVING FIELD
ELECTRODES
(9)
MO[ ION
THICKNESS SHEAR OF A CERAMIC PLATE
Magnetostrictive Generator
ELECTRODES FOR
DRIVE
(9)
POLARIZATION
DRIVING FIELD
l
provide uniform intensity throughout the liquid.
Hermetically sealed cans, with
barium titanate ceramic transducers
permanently mounted inside, are
placed at the bottom or mounted on
the sides of the tank used for cleaning. For high -power cleaning units,
the transducers are usually used in
multiples to cover large areas.
MOTION
ELECTRODES FOR
POLARIZATION ONLY
BENDING MODE OF A HAR
MOTION
RESULTS IN BENDING
Piezoelectric effect in several
differently - shaped ceramic plates.
Fig. 4.
When a rod or piece of tubing
made of a magnetostrictive material
is brought into a magnetic field
which is parallel to its length, this
length is changed slightly. The
change is independent of the direction of the magnetic field and may
be either an increase or decrease,
depending upon the nature of the
material, its previous treatment, the
degree to which it was previously
magnetized, and the temperature
(Fig. 5)
.
teed 200 Mile
Reception With
antenna made-carries written guarantee that
you
will receive 85% of all FM stations within 200 miles
over normal terrain when used with rotator.
Only recommended for fringe areas (locations
where closest FM station is 30 or more miles away).
Stereo-tron has a total gain of 26 DB over a folded
dipole with a fla ::::
response of ±1/4 DB
from 88 to 108
-
ehm) $64.25
Modal PF SC (75 ohm)
$64.25
ELECTRONIC
"TURNSTILE"
ANTENNA
*del
(300 ohm)
_
$55.8ò
Non -directional, has 16 DB gain, receives
in all directions to 125 miles. Both electroni
antennas have built-in amplifiers and co
with power supply. Both are GOLD ANODIZE
FOR MIXED FM RECEPTION AREAS
(locations where one or more FM stations are within 30 miles
and other FM stations are located beyond that distance.)
FM -8 DIRECT IONAL
YAW
eng ,j',R
on
"mixed" areas. Same design
"Stereotron" but without
Wier. Will easily pull in signal
as
LLD ANODIZED.
FM 3T
"TURNSTILE"
Lr
do ..
ens
nt for
"' '' Set
ANODIZED. Model
nstallatìo'
GOLD
The Joule effect (magnetostriction) can be
illustrated by this simple experiment. If an
unmagnetized steel bar is inserted into the
coil when switch S is closed, wattmeter W will
indicate the power applied to the electromagnet. The power input can be increased by
adjusting R to place less resistance in the circuit, and vice versa. If the length of the bar
is mens""red with a micrometer, it will be
found to be shortest when maximum power
is applied.
STEREO-TRON
This is th
as TV
FM 3T
BAR
$12.55
Same as model FM 3T, but includes
complete installation: antenna, mast,
universal roof mount, lead-in wire. Install
It
Y',,
-
FM 3
ECONOMY MODELS
strong
dira,.
"near
rtge
Cool.
$5.05
For free technical bulletins, write today
WinegarAEr,
3009-4F Kirkwood St., Burlington, Iowa
Originators of GOLD ANODIZED TV and FM antennas
Makers of the World Famous Color'Ceptor TV antenna
I
IN CAR, BOAT OR TRUCK,
YOU HAVE IT WITH A
"VgLIPOWER
TCONVERTER
Actually gives you 110 volt, 60
cycle A.C. from your 6 or 12 volt
D.C. battery! Plug converter into
cigarette lighter, and operate
lights, electric shavers, record
players, electric tools, portable
TV, radios, testing equipment
etc.
Models from 15 to 300
watts, priced as low as
See Your Electronics
_Wig
$1
Llsr
2 95
This phenomenon of magneto striction is also known as the "Joule
effect," after its discoverer, J. P.
Joule. The change in length of the
material is relatively small-on the
order of one part in a million.
When a magnetostrictive material
such as nickel is introduced into an
alternating magnetic field, it is periodically shortened and lengthened
by the magnetostrictive effect. Since
this change in length is independent
of the direction of the magnetic field
(if the rod has not been previously
magnetized), it will vibrate at
double the frequency of the alternating magnetic field. However, if it
has been premagnetized, the mechanical change in length will be in
phase with the frequency of the
magnetizing current. The amplitude
of oscillation will be maximum
whenever there is resonance between the natural frequency of the
rod and the frequency of the magnetizing current. Sound waves of the
KNIFE-EDGE SUPPORTS
AVOID DAMPING OF
VIBRATIONS
SOUND VI BRATIONS
ARE TRANSMITTED
FROM ENDS OF BAR
COILS DO NOT
TOUCH BAR
Fig. 6. Basic Pierce oscillator circuit
a magnetostrictive transducer.
with
same frequency will then be transmitted from the end of the rod.
The Pierce oscillator shown in
Fig. 6 can be used to generate
ultrasonic frequencies. Pure nickel
and various nickel alloys give good
results when used in rods and tubes.
This apparatus is considerably
different from a piezoelectric transducer, and yet the end product is
the same-"clean sound."
Parts Jobber, or Write:
COMPANY
40
1073 RAYMOND AVE.
ST. PAUL 8, MINN.
In Canada. ATLAS RADIO CORP. LTD.
-
Ask By Name For
20
GENUINE
10
",, OISE
NICKEL -IRON ALLOY
30
Toronto, Ont.
your
assurance of
brand name
quality
COBALT
0
IRON
-10
PRODUCTS
-20
-30
NICKEL
-40
600
400
200
800
1000
MAGNETIC FIELD) GAUSS)
Fig. 5. Magnetostrictive changes in rod length
with
increased
flux
density.
PRECISION TUNER SERVICE
272
BLOOMINGTON, IND.
P. O. BOX
FREE
I
with each can of
I
5"
ASTI C
I
Push Button Assemblf
For Pin Point
Applications -Does
Not Cause Shorts
I
I
Lubricates, conditions, cleans
all electrical
I
I
nomlcal
little
a:.
sorry
6
...
does
a
a
lot!
I
I
$350
can
J
ELECTRONIC CHEMICAL CORP.
80
PF
REPORTER/April, 1962
7.50
V
COMBO
9.95
or
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POSTAGE
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6 MONTH WARRANTEE
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DEVELOP YOUR OWN
by
TUBE -TEST DATA
W. E. Burke
The ingredients: Basing diagrams, a few key tube specifications, and knowledge of tester-control functions.
Don't sit there and just wish you
could test that new tubo type
it! A reliable system can be developed for almost any tester.
With the multitude of new tubes
being developed almost daily, you're
bound to run across a type you
don't have setup data for, no matter
how new your tester is. Although
-do
Table
Prefix
1
V/MA
Prefix
I
some tester manufacturers make
new setup data available as often as
every month, there are still times
when the information you need is
not immediately at hand. The problem can be minimized if you know
your tester and how to figure out
appropriate test settings.
Even in equipment so new that
-Voltage and Current Ratings of Tube Heaters
V/MA
1.2
4.7/600
1.25
1.4
5.0
5
1.5
5.2/600
5.6/450
2.0
6
1.75
2.0
2
2.1/450
2.3/600
2.35/ 600
2.4/600
7
2.8
2.8/450
2.9/450
3.0/450
3.1/450
3
8
3.15
3.15/600
3.2/450
3.3
3.4/600
3.6/600
9
4.0/300
4.0/600
4.2/300
4.2/450
4.2/600
4.4 /450
4.5/300
4.5/600
4.6/600
10
NOTE:
PF
7.9/600
8.0/300
8.0/600
8.2/600
8.4/300
8.4/450
8.4/600
Prefix
V/MA
11
10.9/ 450
11.0/450
11.6/450
12
13
12.8/600
13.0/100
13.0/300
13.0/450
12.6
14
15
16
REPORTER/April, 1962
9.4/300
9.4/600
9.45/300
9.5/300
9.7/ 600
10.5/ 300
10.5/450
10.5/600
10.6/450
Prefix
19
12.6
14.0/100
14.0/150
14.8/450
15.0/150
15.0/300
15.0/600
16.0/ 300
16.4/600
16.5/300
9.4
4.0
82
7.0/300
7.2/300
7.3/600
7.3/300
9.0/300
9.0/600
3.8/300
4
6.3
6.3
2.5
regular service information is not
yet available, a good serviceman can
determine circuit connections by
checking under the chassis and, by
measuring voltages and resistances,
determine approximately where a
trouble exists. If a tube is suspect
and your tester does not have settings for that tube, what do you do?
20
21
V/MA
Prefix
V/MA
18.9/150
18.9/300
18.9/600
19.0/100
19.0/300
19.4/300
32
34
35
36
38
40
45
50
55
60
70
32.0/100
32.5/300
20.0/100
21.5
22
25
26
27
22.4/450
28
30
28.0
25.0
26.5
27.0
16.8/150
17
18
16.8/450
17.0/100
17.0/300
17.0/600
17.5/150
18.0/100
18.0/ 300
18.5/300
31
30.0/150
30.0/300
31.0/100
31.5'300
"Prefix" denotes d'gits ahead o letters in tube type number. Current ratings
are given only for tubes specially designed for series -string operation.
117
34.0
35.0
36.0
38.0
40.0/100
45.0/150
45.0
50.0
55.0
60.0
70.0
117.0
exclusive in
the world's finest
PHRFAej electronic service
data
famous Howard W.Sams CIRCUITRACE° and SERVICING AIDS!
handiest, most -complete data ever published to speed and simplify servicingequally useful for troubleshooting in the home or on the bench...
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.A`
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o 27
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SEMS
OT MEASUR
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exclusive Sams standardized,
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Here's how CircuiTrace works: All test points are
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...no more guesswork...no need to look at both sides
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makes printed board servicing a breeze!
clearly shown on the schematic and each is plainly
coded (see illustration at left). The same test points are
similarly coded on the printed board photo (see Illustration at right) so you instantly know where to make your
TIME -SAVING SERVICE AIDS for field or shop
TUBE FAILURE CHECK CHART
TUBE PLACEMENT CHARTS
FIELD SERVICING NOTES
END V I DE0
SAFETY GLASS REMOVAL (MODEL KC888)
Remove 4 screws holding the trim strip at the top
the safety glue. Tilt glue out and remove.
If
AMP
INDICATES BLANK PIN
OR LOCATING KEY
POWER SUPPLY FAILURE
No raster, no sound Fuse Wire (LV Power), Fuse
O
er'
1ST VIDEO IF AMP
SWEEP FAILURE
No raster, has sound Fuee (Sweep), V8,
No vertical deflection V7
Poor vert. linearity or foidover V7
DIc
IVIDEfF_
FUSE AND FUSE DEVICE
SOUND
Radin
TV: Sweep - t Amp. (MI)
LV Supply - Fuse Wire (M1)
Filament - Fus.
Wt
IValuable
instructions for making
all necessary adjustments In the home,
locating fuses, removing safety glass, etc.
See
'Mir-
:
1.
Remove
10
push -on type knobs
1. Remove 11 wood
screws I
These are just
a
VIO,
Poor horiz. linearity or foldove
Narrow pleure V8, T^'. ''u
Tube layouts of
top and bottom of chassis
show sync and sound paths, tube
keyways, fuses, rectifiers, etc. Helps
you trace signal path to localize the trouble,
Points out
probable causes of common
troubles, tells you which tubes to
replace to correct the symptom. Also
shows series -string filament connections,
0100'
L
DISASSEMBLY INSTRUCTIONS
TV CHASSIS REMOVAL
VU,
You get step-by-step
procedure for removing
chassis, CRT, speakers,
knobs, hidden bolts and
connections. Avoids parts
damage-saves valuable time.
HORIZONTAL SWEEP
CIRCUIT ADJUSTMENTS
Set the Horizontal Hold Control to
Horizontal Frequency Slug (BO
tally. Keep turning HI in the
I
out of sync.
Reverse th
Detailed instructions help
you solve the troublesome
problem of adjusting the
horizontal circuits (oscillator,
linearity, and width)-avoids
guessworkl
few of the dozens of great features in PHOTOFACT for fastest, easiest, most profitable servicing.
See your Sams Distributor for full details on an Easy Buy Library or Standing Order subscription!
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April, 1962/PF
--_-I
REPORTER
83
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Ihr. Service Dealer....
the "MERIT" line is
your Line .......
and we constantly strive
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Any suggestions will be
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and we'll mail you a new
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MERIT PENCIL HOLDER
with our compliments.
erf
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COIL &
TRAI1SFORIER CORPORATIO11 .
MERIT PLAZA
84
PF
..
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..
REPORTER/April, 1962
-
HOLLYWOOD, FLORIDA
.
.
You might run to the distributor
and ask for a tube of that type. But
suppose the tube is too new and he
doesn't have it in stock-what do
you do next?
If you do have service information on the chassis you are servicing, consult the schematic to see if
there are any alternate tubes listed.
Also check to see if the tube is
listed in one of the available tube substitution handbooks. If no substitute can be found, you have to
start determining how to test the
tube in your tester. Some of the requirements for this are several good,
complete tube manuals, up-to-date
tube -information releases, and the
instruction manual for your tester.
Start by comparing the suspect
tube with some of the older types
used in the same stage or circuit in
older equipment. Suppose the trouble lies in a video IF stage. Now, the
major improvements in IF amplifiers
over the years have been in lowered
interelectrode capacitances and increased transconductance. Since capacitances aren't measured on a
service -type tube tester, the change
in transconductance and a possible
change of basing connections are
all you really have to consider. The
basing can be determined by inspection of the under -chassis wiring. If
yours is an emission -type tester, the
changed transconductance doesn't
matter. An emission tester checks
all tubes as diodes, so if you test
the suspect tube with settings for
an older but similar tube type, a
fair test can be made. If you have
a transconductance tester, you will
have to determine new settings for
the tube; we will soon see how this
can be done.
If your suspect is a vertical or
horizontal output tube, just remember that improvements in these
tubes haven't been drastic as far
as tube testers are concerned. The
major improvements in these pulse
amplifiers have been an increase in
the peak positive plate voltage the
tube can tolerate, an increase in
maximum pulse cathode current,
and an increase in the plate -to screen current ratio.
With tubes for other circuits in
entertainment -type equipment, the
principal new improvements have
been increased heater -to -cathode
voltages, changes in filament voltage
ANOTHER PRECISION
SERVICE TIP FOR YOU.
WELL,JUST ONE
MORE CALL TO
MAKE TONIGHT.
HOPE MY PORTABLE
PRECISION CR-60
PRECISION
PETE
'EVENING, MISS DORA.
HELLO, MISS FLORA.
WHAT SEEMS TO BE
THE TROUBLE?
CRT PICTURE TUBE
TESTER AND
REJUVENATOR
CUTS THIS
ONE SHORT.
Q
THE PICTURE ON
MY PORTABLE IS SO
DARK, I CAN'T TELL
THE COWBOYS
FROM THE
INDIANS!
AND ON
MY COLOR
SET, THE
PICTURE
IS DIM,
TOO.
MMM...THE METER ON
THE CR -60 READS BAD.
I'M SORRY, THE METER
STILL READS "BAD"AND
EVEN TRYING TO REJUVENATE
A BOOSTER MAY HELP
WITH THE CR -60,
DOESN'T HELP. YOU'LL NEED
A NEW PICTURE TUBE.
I CAN INCREASE
AC HEATER
VOLTAGE TO
OH, DEAR!
ARE YOU
SURE?
SIMULATE A
BOOSTER
d
6k6ñd48rysr,
illh
,..T
..
O,
(o
(P
aI
PETE,
WHAT ABOUT
YES, YOU SEE,THE PRECIS?ON (R -6o IS
THE DIM PICTURE
THE ONLY TESTER OF ITS KIND TODAY
ON MY COLOR
ONLY
TELLS
THAT NOT
ME IF A°BOOSTER"
SET?
WILL SOLVE THE PROBLEM, BUT ALSO
LETS ME CHECK FOR TUBE BRIGHTNESS
UNDER HIGH OR LOW LINE -VOLTAGE
CONDITIONS
WELL, THE PICTURE TUBE IS FINE, SO THIS DIMNESS
MUST BE DUE TO SOME OTHER CONDITION. PROBABLY IN
THE CHASSIS. WHEN I COME BACK TOMORROW WITH YOUR NEW TUBE, DORA,
(%
I'LL BRING MY PRECISION COLOR TEST
EQUIPMENT TO FIND
THE TROUBLE.
1
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1
QUICKER SERVICE WITH THE CR -60
ELIMINATES MANY CALL-BACKS, SAVES TIME AND EARNS YOU
MORE PROFIT. FOR MORE SERVICE TIPS WITH THE CR -60
(DEALER NET $64.95), WRITE FOR BULLETIN #IOO. IT'S FREE!
SERVICEMEN:
OH, PETE!
YOU'RE
WONDERFUL!
WE'LL SEE YOU
TOMORROW.
III
rú
THAT'S ONE CALLBACK I'M GOING TO
ENJOY, THANKS TO
PRECISION'S CR -60
CRT TESTER AND
REJUVENATOR.
.....
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PRECISION
84th
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APPARATUS
CO., INC.
STREET- GLENDALE
27, N.Y.
ALL PRECISION TEST EQUIPMENT IS GUARANTEED
FOR ONE FULL YEAR AND BACKED BY OVER
30 YEARS OF ELECTRONIC EXPERIENCE.
April, 1962/PF
Ii
REPORTER
85
and/or current characteristics for
TRANSISTOR LYTICAPS
TYPE "TL"
"TL"
Sub -miniature aluminum foil capacitors
clear plastic
hermetically sealed in aluminum tubes
outer insulating sleeves .
all mechanical internal con-
TYPE
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...
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nections
no "cold weld" nor "pressure" connections
.
engineered for quality for replacement in all transistorized circuits.
Write today for complete information.
.
.
PLANET SALES CORPORATION
225 Belleville Avenue
Bloomfield, New Jersey
use in series filament strings, combinations of two or more tubes in
one envelope, and changes of base pin arrangements for circuit convenience.
There once was a day when tubes
had either a 2.5-, 5-, or 6 -3 -volt
heater. Those days are gone forever! Now heater voltages range
from .625 volts to 117 volts, with
a total of 89 different voltages.
Table I shows how many different
voltage -current combinations are
represented by the prefix (first one
or two digits) in the type numbers
of existing tubes. The filament voltage selector on your tester may
not provide all of the needed voltages, but will come close enough
in most cases.
An additional hint for determining filament voltages is to check the
other tubes in series strings. They
may be older tubes, and you can
look them up in a tube manual and
find the filament current. This same
current rating will apply to the un know tube, and you can use this
information to help locate the exact
filament voltage in Table I. Also
check to see if the tube in question
tester's chart under a
different filament voltage. For instance, the 6EH7 is also manufactured as a 3EH7 and a 4EH7.
Every control setting, except for the
filament voltage, is the same for all
tubes of this group.
Tube designers have been going
all out to help the equipment designer in his fight to reduce the total
number of tubes in a receiver. Combinations of tubes in one envelope
such as triode -pentodes, twin pentodes, triode-tetrodes, and triple triodes are becoming more numerous.
One tube manufacturer has even announced a tube including both the
horizontal output amplifier and the
damper in one envelope. This tube,
the 6JF8 by Raytheon, would be
fairly easy to set up in your tester
because the output section is the
exact equivalent of the 6DQ6B and
the damper section is the exact equivalent of the 6AX4GTB. If you
determine the base connections and
transpose these to your tester's settings for the 6DQ6B and the 6AX4GTB, the hard work is done.
The rearrangement of base pins
of an older tube to produce a new
tube requires that a new type numis on your
ir
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PF
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RAYTHEON
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88
PF
REPORTER/April, 7962
-
curring with some of the newer
tubes and poses only one problem.
Which old tube was revamped?
Again, compare the new tube to
older tubes used in the same type
of circuit.
For instance, the 18FW6 is new
enough that it may not be on your
tester chart. It is also old enough
that it is in many tube manuals. If
you were to compare the specifications of the 18FW6 with those of
the 12BA6, you would find that
they are identical with the exception
of the filament voltage and current.
Likewise, the 18FX6 and the 18FY6 are identical to the 12BE6 and
the 12AV6 other than the filaments.
Many other tubes that are related
in this way can be found.
Types of Tube Testers
The most basic of all tube testers
is the emission type. All electrodes
except the cathode are connected
to the plate, an AC voltage is applied between plate and cathode,
and the resultant rectified current
is measured by a meter. The main
difference in settings (other than pin
connections and filament voltages),
between two different tube types is
the adjustment of what is usually
called a LOAD, SHUNT, or PLATE Control. This is a variable resistor, in
series with the applied voltage,
which limits the current and calibrates the meter.
When attempting to calibrate a
new tube on such a tester, you must
determine where to set this LOAD
control. The appropriate procedure
is to compare the settings for several
tubes of the same general type and
obtain an average setting of this
control. For instance, several different types of horizontal output tubes
may require LOAD settings that vary
between 81 and 96 on your tester.
If you make your new setting about
89, you will be very close. Several
different IF amplifiers may require
settings between 28 and 46, and a
setting of 37 should do the job.
Remember, of course, that you will
have to judge the resultant meter
reading on this basis. It may be
slightly lower or higher than the
nominal 100% value, depending on
the LOAD control setting.
In a transconductance tester, appropriate AC and DC voltages are
NO INDICATION
Good Fuse
==
GBA
Fuse
RED DOT
Clearly Shows
Open Fuse
GBA
Fuse Open
Another
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by the makers
of BUSS fuses
New!
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even after power is off.
BUSS HLD fuseholders are for panel mounting in
circuits of 125 volts or less. They take 1/4 x 11/4 inch BUSS
GBA fuses. Knob of holder grips fuse tightly and pulls
fuse from holder when knob is removed.
Side terminal is held mechanically as well as by solder.
Heat of soldering cannot cause it to loosen or come off.
Vibration will not cause failure of terminals as they
are designed to withstand severe service.
Get the full story, write for BUSS Bulletin SFH-9.
complete line of fuses and
fuse mountings of unquestioned high quality.
BUSS: The
BUSMANN MFG. DIVISION
McGraw -L d,son Co.
St. Louis 7, Mo.
462
April, 1962/PF
REPORTER
89
1. Rotary switches for setting up
elements on transconductance tester.
Fig.
applied to all elements, and the AC
plate current resulting from an applied AC grid voltage is measured.
More controls and switches must
be properly positioned to obtain an
accurate reading with this type of
tester. The majority of transconductance testers provide a plate voltage switch, a variable meter shunt control, and a grid -voltage
control. Studying the tube manual
data and tester instruction book will
enable you to determine what plate
voltage ,to apply, the setting of the
meter -shunt control, and the proper
grid voltage.
Types of Switching for
Various Pin Connections
The types of switching used in
service-type tube testers include ro-
tary switches as in Fig. 1, lever
switches as in Fig. 2, and pushbutton switches as in Fig. 3.
Rotary switches, when used, are
inserted into the circuit function
to be switched, and each switch
position corresponds to a certain
socket pin. The tester panel shown
in Fig. 1 has seven rotary switches
-one for each side of the filament
and one each for the control grid,
plate, screen -grid, cathode, and suppressor circuits. Switches of this
type are usually interlocked so that
one socket pin cannot be connected
to more than one circuit. For example, if the grid switch is set at
pin 5, this pin is disconnected from
all the other switches. Accidental
shorts that might damage the tube
tester are thereby prevented.
When lever switches are used,
one switch is provided for each
socket pin, and the different switch
positions correspond to the circuit
function. The tester panel shown in
Fig. 2A has twelve lever switches,
each of which can be set in five
positions labeled W, X, Y, Z and
NORMAL. As explained in the in-
^
;4
-
111111114111111411111(
-
ore
(A) With five positions.
=4R:
a141
If
41
(B) With three positions.
Fig. 2. Tube -element lever switches.
struction manual accompanying this
particular tester, these positions
correspond respectively to open,
screen -grid, plate, control -grid, and
cathode connections.
Emission testers having lever
switches will usually have only three
positions for each lever switch.
These are: one position for all elements other than the filament and
cathode, one position for the high
or "hot" side of the filament, and
one position for the cathode and
j-j
N
this...
seems
like this...
when you
use this!
Fisher FM tuners are the world's most sensitive.
simple under -the -rug dipole will seem to perform like a multi -element
Yagi when there's a Fisher tuner at the end of the lead-in. Even the least
sensitive of the new Fisher FM Stereo tuners with built-in Multiplex needs
A
no more than 0.7 microvolts for 20 db quieting (2.2 microvolts IHFM); the
most sensitive breaks all records with a 20 db quieting sensitivity of 0.45
microvolts (1.5 microvolts IHFM)! This kind of sensitivity can laugh at weak signal areas... and makes up the important difference between mono
and stereo FM sensitivity requirements with margin to spare. Explain Fisher
tuner performance to your next customer with FM reception problems.
90
PF
REPORTER/April, 1962
1
--USE
THIS COUPON FOR DETAILED INFORMATION
--1
Fisher Radio Corporation
21-24 44th Drive, Long Island City 1, N. Y.
Please rush free literature and complete
specifications on all Fisher FM Tuners and Receivers.
NAME
ADDRESS
CITY
ZONE
STATE
the "cold" side of the filament. The
tester arrangement shown in Fig.
2B has these three positions-the
top for all elements which are tied
to the plate, the center for the hot
filament pin, and the bottom for the
cathode. It is important to note that
the levers on this tester are identified
by the letters A through K, but that
these letters correspond respectively
to pin numbers 1 through 9.
The tester shown in Fig. 3 is an
example of noncorresponding push
buttons. You will notice that the
top row of buttons set up the filament and cathode connections. For
a 6J5, the chart specifies that buttons 1, 2, and 3 in the top row
should be depressed. Now, you
know that the filaments of a 6J5 are
pins 2 and 7, and that the cathode
is pin 8. Obviously, the buttons do
not correspond to the pin numbers.
Luckily, the instruction book for
this model of tester includes a chart
showing which pin numbers correspond to which button numbers.
For other pushbutton testers which
pose this problem, you can make
your own chart.
Limitations in Number
of Pins Accommodated
The number of socket pins which
a particular tester can accommodate
is determined by the number of
switches of the lever or push-button
type or by the number of positions
on switches of the rotary type.
Naturally, this is of concern only if
you wish to modernize an older
tester by adding the newer types of
sockets such as the 5- and 7 -pin
Nuvistor, the Novar, the 10 -pin
noval, and the 12 -pin Compactron.
If you don't want to redesign your
tester, but wish to test these new
types of tubes, adapters are available to fit almost every tester having an octal socket.
Setting Up a New Tube
Instead of supposing an imaginary new tube, let us consider an
actual tube-one that is too new
to be on your tube -tester chart. A
good example is the 16AQ3, a
diode intended for damper service.
It is being used in a portable receiver with a 114° picture tube. For
the last year or so, this set manufacturer has been partial to using the
Mere V.
t o'.21"
Grid
,
J
Fig. 3. Push-button numbers do not correspond to actual pin numbers of tubes.
6AF3 and 12AF3 in portables with
114° sweep circuits. Thus, we are
going to compare the new 16AQ3
to the 'AF3 in our testing procedure. One requirement for this is
that the 'AF3 must be included on
your tester chart. We know that the
16AQ3 must equal or exceed the
maximum ratings of the 'AF3, but
that the filament and possibly the
basing are different. The filament
must be in the range between 16.0
and 16.5 volts as indicated in Table
I. If 17 volts is the closest setting
available on the filament selector on
your tester, this should be satisfactory. The basing can be determined by inspection of the socket
wiring in the receiver.
The filament leads will be easy
to find, since this is a series -filament
chassis. Each filament lead must go
to a filament pin on another tube
socket, or to a resistor or choke in
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the filament string. Since this is a
9 -pin miniature tube, the odds are
that the filament pins are 4 and 5.
Inspection proves this to be true.
The cathode of a modern damper
tube receives the high -voltage negative pulses from the horizontal circuit, so this terminal on the tube
must be better insulated than the
plate terminal. Accordingly, all
damper tubes of miniature construction have the cathode connected to
the top cap. Inspection of the circuit proves this to be true for the
16AQ3.
The plate pin of the tube is the
only other one to be determined. A
look at the socket shows that pin 9
is the only pin with connections;
therefore, this must be the plate pin.
The switch or push-button settings for the 'AF3 can also be used
for the 16AQ3, with one exception
strictly for safety's sake. If yours is a
lever -type tester with an "open"
position for the levers, position all
the levers for unused pins in this
open position. Most damper tubes
have some of the unused pins reserved for internal connections, and
if these pins were not opened by the
levers, a short could exist and dam -
1111
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92
PF
REPORTER/April, 1962
1
ROHN Manufacturing Company
Box 2000
Peoria, Illinois
Send me
omplete literature on the following ROHN Products:
Home TV Towers
Amateur Towers
Communication Towers
AM -FM Broadcasting Towers
Micro -Wave Towers
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City
State
age the tester. If your lever -type
tester does not have this open position, you can exercise the same
caution by checking with an ohmmeter for continuity from the plate
(pin 9) to all unused pins. The
levers for any pins that show continuity to the plate pin should be
moved to the same position as the
plate pin. If the new tube you are
checking has active elements other
than the plate, use the same method
to identify internally -connected pins.
You are now ready to set up the
tester and test your suspect tube.
Set the filament voltage selector to
approximately 16 volts. Set the
other controls, switches, push buttons, etc., to the settings given for
the 'AF3 tube type. Push the test
button and observe the meter indication. A good tube will come
close to or exceed the expected
reading for the 'AF3, and a bad
tube will fall far short. Shorts and
gas tests will be the same as for the
'AF3.
fications for the job. ROHN towers are hot -dipped
galvanized after fabrication-a feature ROHN pioSERVICE WHEREVER YOU
Fig. 4. Pin connections of 6FR7 tube
in vertical oscillator - output circuit.
A diode is the simplest tube to
set up. Let's now consider a multi element tube such as the 9A8 triode -pentode in the same receiver.
This is a foreign tube registered with
EIA by Rogers Electronic Corp. of
Canada in 1956. This is the first
time it has been used in an American receiver, but the tube is old
enough to be in several different
tube manuals-which all state that
the specifications of the 9A8 are
identical to those of the 6BL8 with
the exception of the filaments. Use
the 6BL8 settings with a 9 -volt filament voltage, and you can test the
9A8.
For a more difficult example of a
dual-purpose tube, let us consider
the 6FR7, which is fairly new and
may not be covered by the chart for
your tester. This tube contains two
triode sections. The low-power
section is intended for service as a
vertical oscillator, and the high power section is intended as a vertical output amplifier. One of the most
popular dual triodes for vertical oscillator -vertical output use has been
the 6EM7, so let us compare our
new tube to this type.
The 6FR7 has a 9 -pin miniature
base, while the 6EM7 has an octal
base. We will have to develop new
settings for the switches, levers or
push buttons which set up the pin
connections. Turn the receiver chassis up so that the 6FR7 socket is
visible, and start tracing connections.
Pin 1 has a blue lead which goes
to the vertical output transformer.
Thus, pin 1 has to be the plate of
the output section. Pins 2 and 3 are
connected together, and the components tied to these pins include a
.1-mfd capacitor and a 1-megohm
resistor. Either one or both of these
pins must be the grid of the output
section. To play safe, assume that
both pins connect to the grid, and
set them both together on the tester.
Pins 4 and 5 have a pair of twisted
brown wires connected to them, so
these must be the filament connections. Pin 6 has a lead going to the
height control and also is connected
to the capacitor going to pins 2 and
3. Thus, pin 6 has to be the plate
of the oscillator section. Pin 7 is
connected to the vertical hold control and appears to be the grid of
the oscillator section. Pin 8 goes to
ground, and the only tube element
this could connect to is the cathode
of the oscillator section. Pin 9 connects through a resistor to the vertical linearity control and is almost
certain to be the output cathode
terminal. All of the pins are now
identified (Fig. 4) , so let's set up
the tester.
The filament connections in the
tester should be set to pins 4 and
5. We will arbitrarily test the oscillator section first; to do so, the plate
circuit should be set to pin 6, the
cathode circuit should be set to pin
8, and the grid circuit should be set
to pin 7. Since these tubes have two
sections, we need to identify the
oscillator section of the 6EM7. A
look at a tube manual tells us pins
specifies for the other test of the
4, 5, and 6 connect to the oscillator
section; therefore, the other controls on the tester should be positioned as the chart specifies for the
6EM7 test which includes pins 4,
5, and 6.
In the second test, for the output
section, we should set the plate circuit to pin 1, the cathode circuit to
pin 9, and the grid circuit to pin 2
or 3. (If the grid connects to only
one of these and you pick the wrong
one, the tube will test bad. If it does,
be sure to try the other pin and retest the tube.) The other controls
should be positioned as the chart
THAT SOLVES AL
6EM7.
You can see that many of the new
tubes are minor improvements on
old tubes. Start now and make a
file of all of the tube manuals and
manufacturers' specification sheets
that are available from your distributor. Some of the trade magazines
publish specs on new tubes as they
are released-clip these and add to
your file. Keep yourself and your
tube tester up to date, and you'll
save time when you find it necessary
to check a suspect tube for which
you have no setup data.
YOUR TV TUNER PROBLEMS
ONE PRICE
fool around drilling,
... do you have the time toto make
a "Universal"
...
trying
replacement tuner fit in place of the original?
... do you have all the expensive instruments and
equipment to complete the alignment so essential
after each tuner repair or replacement?
... can you spare the time repairing and adjusting
your own TV tuners and can you charge enough
to justify the time spent?
sawing, filing
A Castle Overhaul eliminates every one of these problems.
Castle replaces all defective parts, (tubes and
major parts are extra at net prices) and then
aligns your tuner to the exact, original specifications.
Simply send us your defective tuner complete; include tubes, shield cover and any damaged parts
with model number and complaint.
Send for FREE Mailing
Kit and complete details.
CAST L E
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ALL MAKES
VHF TUNERS
UHF TUNERS
UV COMBINATIONS*
*UV combination tuner
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unit sent in.
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TV Tuner Overhauling
Pioneers in
TV TUNER SERVICE, INC.
5701 N. Western Ave., Chicago 45, Illinois
653 S. Palisade Ave., Cliffside Park, New Jersey
In Canada: 136 Main St., Toronto 13, Ontario
April, 1962/PF
REPORTER
93
Pop Goes the
TROUBLESHOOTER
answers your service problems
Horizontal Alignment
-probably because of
In reading over your February issue,
noted Mr. Edwin H. Robac's problem
concerning waviness in the raster on
a General Electric Model 21C242.
This condition can occur through improper setup of the horizontal hold control and horizontal stabilizer coil. Therefore, the following procedure should be
tried before any components are tested:
1. Tune in a weak signal and set all
controls for a normal picture.
2. Short the arm of the horizontal
hold control to the junction of the 3000 ohm and 680K -ohm resistors in the horizontal AFC circuit (R89 and R96).
3. Connect a 1000 -ohm resistor across
the horizontal stabilizer coil.
4. Adjust the horizontal hold control
until the picture just "floats" back and
forth across the screen.
5. Remove the resistor from across
the stabilizer coil, and adjust this coil
until the picture again floats across the
screen.
6. Remove the AFC jumper. The picture should lock in properly, and slight
adjustment of the hold control should
be sufficient to compensate for future
aging of tubes. No further adjustment
of the stabilizer coil should be made,
once the alignment is completed.
If the picture cannot be made to "float"
in step 4, the free -running speed of
the horizontal multivibrator is incorrect
I
FROM
HORIZ HOLD
off -value components. Unless this condition is remedied, horizontal stability will be poor.
Should the problem persist, it may
be due to 60 -cps hum fed in through a
poor ground connection. Ground returns
in this chassis are made by soldering
component leads into hollow metal pins
which are riveted to the chassis. Some
grid returns are made to the same pins
which carry tube -filament grounds. If
corrosion develops between these pins
and the chassis, enough filament voltage
may be picked up on grid leads to induce bending in the picture. Thus, all
grounds in the sync amplifier, clipper,
phase splitter, AFC, hori-ontal oscillator,
and horizontal output should be checked.
This is easily done by shorting the pins
to chassis while watching for the picture to straighten out.
A poor connection can be corrected by
soldering the pin to chassis, using a
heavy iron, or by bolting in a solder lug
to carry the component leads.
R. C. HANNUM
Supervisor-Technical Service
General Electric Co.
Syracuse. N.Y.
This is a revised alignment procedure
which replaces the instructions originally
given in manufacturer's data and in
PHOTOFACT Folder 264-7. Filing this information with the 21C242 schematic
would be a good way to avoid future sync
headaches.
vA.---1]. 220v
SYNC AMP
25K
680K
82K
910K
FROM HORIZ
OUTPUT TRANS
001
HORIZ AFC
HORIZ MOLT
820
12AT7
mmf
12AU7
6
6.4V
-JUMPER
150
7.6V
510 mmf
5.4V
-77VI
711-1
35V
68K
3
_0022
36K
12K
8V
4.7
meg
910K
.039
I.
0012
10000
220V
ó
6
TEMPORARY SHUNT
220V
94
PF
REPORTER/April, 7962
HORIZ
STABILIZER
..
I have a hard time locating 'TV trouble
which cause the fusible resistor to poi
as soon as the set is turned on. Wha
are the main causes of high initial surg
currents in sets which show no apparen
B+ shorts?
KENNETH PIERCE
Kansás City, Mo.
A defective input filter capacitor in
the B-{- circuit, or rectifiers with lower than -normal reverse resistance, could IN
at fault. The best way to check this pos
sibility is to substitute new parts, beint
careful not to use an input filter with
much higher capacitance than the original
(If you did so, it would increase the initial surge current.)
Another important factor is the value
of the fusible resistor itself; if this is
higher than the resistance called for in
the design of the set, the resistor will dissipate too much power and will be prone
to burn out.
About the only remaining suspect would
be an elusive short-perhaps intermittent
-somewhere in the B+ network.
Where's the Oscillator?
I'd like some help with a Silvertone
Model 4118 (covered in PHOTOFACT
Folder 227-12). After the set has been
on for about an hour, a number of thin
horizontal bars appear in the picture,
and a slight tone or whistle can be heard
from the speaker. The bars are five or six
scanning lines in thickness, and are evenly
spaced by this same interval. The picture
is still visible through the bars.
The trouble appears on either VHF or
UHF. It can be made to disappear for
awhile if the tuner is switched off channel and back again, if any tube is pulled
and reinserted, or if any point in the IF
or audio section is touched with a test
probe.
I have checked the filters in the audio
circuit, and have even tried substituting a
different tuner, with no luck. All tubes in
the suspected sections have been replaced.
I'm having trouble getting anywhere with
voltage and resistance checks because, as
i mentioned, any circuit disturbance clears
up the condition for awhile.
A. L. ORTMAN
Decatur, Ill.
Our first thought was that you might
have a microphonic condition in the tuner,
but you've already ruled this out by tuner
substitution. We've also seen similar
symptoms caused by open bypass or de coupling capacitors in the picture -signal
stages, and even one case of horizontal
bars due to internal arcing in the picture
tube!
The bars and the whistle are signs of
audio oscillation, likely in some stage
common to the picture and sound signals.
Thus, the trouble could he originating
at any point from the IF input to the
sound take -oft circuit at the plate of the
video amplifier. It's also possible that an
audio -circuit defect could be causing feed -
back into the video section through the
130 -volt B+ line, which has the cathode
circuit of the audio output tube as its
source.
Since the condition is so sensitive to
probing, it's very difficult to isolate by
the usual voltage-checking or signal -tracing methods. I'd suggest starting at the
CRT and working back through the video
and IF sections, looking for such things
as faulty bypass capacitors and poor solder joints.
You also might be able to narrow down
the trouble area by connecting a VTVM
or scope to a major test point (such as
the video -detector output) before turning
the set on. This would avoid the transient
surges that result from touching a probe
to a "live" circuit, and might allow you
to see what happens to key voltages and
waveforms when the trouble first appears.
Fill Out the Corners
I would like to use an RCA Chassis
KCS83 to drive a bonded -shield 23" picture tube in a custom installation. Does
this sound feasible? If it does, what modifications would have to be made to the
chassis, and which type of 23" tube
would be best suited to this job?
RICHARD CIESIELSKI
Dick's TV and Radio
Lisle, Ill.
The success of this project depends on
whether or not this chassis has enough
reserve sweep power to increase the CRT
deflection from 70° to 92°-the smallest
sweep angle available in a 23" tube. You
could get a rough idea of the results by
making a preliminary check with an 8",
90° check tube. if you can obtain ample
sweep by advancing the width and height
controls. this is a good sign; otherwise,
you'll have to modify or rebuild the sweep
circuits. Width is more likely to be a problem than height, but you may be able
to increase the width slightly by connecting a small capacitor (50 to 100 mmf)
across the horizontal windings of the yoke.
If you do this, be sure to check the resulting increase in horizontal -output cathode current, and make sure it isn't excessive.
The most suitable CRT for your purpose would probably be the 23XP4, a 92°
tube which is designed to operate with
somewhat less high voltage than many
other new square -cornered tubes. You
should not expect as much "sparkle" and
contrast as in a new set with 20 -kv anode
voltage and 150 -volt video drive, but the
13 or 14 kv in the KCS83 should be
adequate for a good picture.
The 23" tube will be electrostatically
focused, so you can simply eliminate the
old focus magnet-and the ion trap, too.
You'll need to add a pin -6 connection to
the CRT socket and apply a focusing potential to this pin. You can tap in anywhere in the B+ or boost system for
focus voltage, choosing any value which
gives acceptable results.
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This popular RCA 5 -inch scope maw at your
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used in
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The new "C" version of iris ime -tested
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Other "PLUS" Features:
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Paternal calibrating voltage and calibrated
5 -inch screen
6v2" meter face
200-4 meter no.ement wi-h
ses than 1Y
tracking error
Pr_cisioi mullipl er resisbrs accurate to
Meter electronically protec-rd against
graph screen
burnout
Includes special direct/low capacitance
Separate color -cased peak -:o -pack and rms
voltage sca es
Die-cast aluminum case wi-h 'tether car yin; handle
shielded probe and cable
MEASURES:
wits, 0.C2 to 15.0 volts
volts, 0 1 to 150C vo is -m: o- .2 to 42)0
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April, 19f2
PF REPORTER
95
Antenna Preamps
(Continued from page 35)
sidered as ideal or "perfect" for the
ordinary flashlight batteries, while
type of unit in question. (Obviously,
the RP4-AC is powered from 115
a figure of "zero" cannot be used,
volts AC.
so something approaching zero must
Published figures specify that gain
be chosen as a reference.) The reranges from 13 db on Channel 2 to
sultant noise figure is thus a ratio,
10.5 db on the higher channels (7which can be expressed in db. An13) At FM frequencies, the gain is
other way of arriving at a noise fig11 db. The noise figure varies from
ure is to compare the noise output
5 db on the low band to 6.5 db on
obtained when no signal is applied
the high band.
at the input, to the output obtained
Also available from Blonder with a specified noise -signal input.
Tongue is the AB -2 (Fig. 2) , a vacAs you can see, there are various
uum -tube unit which provides an
methods of arriving at a noise figaverage gain of 10 db across the TV
ure, and the result will vary in acband.
cordance with the reference levels
Channel Master Model 0020
and types of measurements used.
Channel Master has just develThus, a simple comparison of the
oped a new version of their Jetron,
gain and noise figures of different
an antenna -mounted preamp emunits is not necessarily indicative
ploying a triode -connected PADT
of their relative performance capatransistor in a common -base configbilities
unless the specifications
uration (see Fig. 4). Like the earlier
were derived by using exactly the
same set of measurement standards.
150 PIE/01N
.
Duotone needles, of course ... tipped with
genuine diamonds, sapphires or osmium.
Most people forget to change their styli
or don't know how to change them. Why
not suggest a Duotone diamond needle
replacement for every phonograph that
comes into your shop? It's the stylus with
the whole diamond tip that's handset and
hand polished. Your customers will appreciate the service and you'll appreciate
the increase in business.
Write for Free 1962 Duotone
Needle Wall Chart and see
DUOTONE Distributor.
"Chicago Parts Show-Rooms 609A and 611A"
COMPANY r>vc.
KEY PORT, N. J.
Send for NEW
FREE
CATALOG x961
with oscillator
circuits
CITIZEN BAND
CLASS "D"
CRYSTALS
Hermetically Sealed
3rd Overtone:
.005% tolerance-Meet F C C requirements. 1/2" pin spacing--050 pin di-
SZ95
(.093
pens
add 15c per
crystal.)
EACH
ALL 22 Frequencies
in Stock!
(add Sc per errata' for postage and handling)
The following Class "D" Citizen Band frequencies
in stock (frequencies listed in megacycles): 26.965,
ameters.
available,
26.985,
27.065,
27.195,
27.215,
26.975,
27.055,
27.125,
27.205,
27.015,
27.085,
27.165,
27.005,
27.075.
27.155,
27.225.
27.025,
27.105,
27.175,
Matched crystal sets for all CB units
set. Specify make and model numbers.
.
.
.
27.055,
27.115,
27.185,
in HC6/U HOLDERS-SIX FREQUENCIES
in stock for Immediate delivery (frequencies listed in
megacycles); tolerance .005,1r. TA» Pn spacing.
.050 in diameter. (.093 pins available. add 150 per
erystal1 S teclfy frequency desired.
$
27.145,
56 mml
Typical Preamps
ANT
Now that you have some idea of
how antenna -preamplifier perform-
295
EACH
NOW! Engineering samples and small quantities for
prototypes now made either at Chicago or at Ft.
Myers Plant. 24 Hour Service!
IN CHICAGO, PHONE GLadstone 3.3555
for FREE CRYSTAL CATALOG #961
ASK YOUR PARTS DEALER FOR TEXAS CRYSTALS
See big red display
If he doesn't stock them,
send us his name and order direct from factory.
.
RUSH YOUR ORDER NOW TO
TEXAS CRYSTALS.
1000
Dept.
(pf.4)
Cry.tal Drive, Fort Myer., Florida
Phone WE 6-2100
FOR SHIPMENT VIA FIRST CLASS MAIL AT NO EXTRA
COST ATTACH THIS ADVT. TO YOUR ORDER!
96
PF
REPORTER/April, 1962
e
PAOT-21
56 mml
ó200n
6200.
eral units, all representative of those
currently in production, and learn
what they have to offer.
10 m
56 mml
mrn
Blonder -Tongue Model AB -4
The Signal -Master Model AB-4
(Fig. 1) uses a PNP transistor in a
common -emitter circuit. The unit
provides facilities for operating four
different sets, through the use of a
signal-splitter network built into the
power supply. The amplifier is mast mounted, while the power supply is
normally fastened to the rear of the
TV receiver.
2nd
SET
Two different power supplies are
available; the RP -4 operates on four
4th
SINGE
3rd
1st
SET
SET
SET
SET
Fig. 4.
Schematic of Channel Master
Model 0020 preamplifier and supply.
MERCURY TUNER SERVICE, INC.
890-1 River Ave., Bronx 51, N.Y.
"Largest in the East"
VHF -UHF TUNERS
7 Months
WITH OSCILLATOR CIRCUITS
.
200 mini
470K
ance is defined, let's examine sev-
(add SC per crystal for' postaga.haneling)
Send
WOUND ON
FERRITE CORE
470K
$5.90 per
RADIO CONTROL CRYSTALS
26,995, 7.045, 27.095,
27.195. 27.255..
-
Warranty
Price Includes Labor & Minor Parts
TUBES 8 MAJOR PARTS
AT NET PRICES
When Shipping Tuner: Include Tubes,
Shields and Damaged Parts.
Give Model Number and State Complaint
PACK WELL AND INSURE
24 HOURS ON POPULAR TYPES
ALL MAKES
ONE PRICE!
$9.50
Now in
breakproof
plastic
utility case!
Ce..
Fig. 5. Channel Master Model 0020 pre amp and AC -operated power supply.
Case can be used for
carrying or storing tools,
parts and equipment-or as
a lunch box. Made of
rugged polypropylene with
self -hinge that won't rust.
Fig. 6. Channel Master 0020 with
cover removed to show internal view.
model, this unit is unique in that it
provides more gain on the upper
channels than on the low end of the
band. Furthermore, the manufacturer indicates that the new model has
a higher average gain than its predecessor; however, the unit is just
coming out of the "pilot" run stages,
and no specific gain and noise figures have as yet been released. The
new design is pictured in Figs. 5
and 6.
The power supply is fed from 115
volts AC, and contains a built-in
four - set coupler. The amplifier
measures 11/4" x 31/2" x 61/2" and
weighs 12 ounces, while the power
supply is 5" x 33/4" x 13/4 ".
Jerrold Model APM-101
The Powermate (Fig. 7) is an
antenna -mounted unit which uses a
PNP transistor as a common -emitter amplifier (Fig. 8) The preamp
is housed in an aluminum case and
is connected through solid -bar conductors to the antenna terminals, assuring a constant impedance match
regardless of frequency.
The manufacturers' specifications
.
Weller adds greater value to the Heavy Duty Soldering Kit with
a new utility case of miracle plastic that won't break. Kit features
the Weller 250 -watt Soldering Gun used by electronic service technicians the world over. Instant heat. Twin spot -lights. Long life, long
reach tip-made of copper for superior heat transfer
and iron plated for long life. Also included in this
kit are smoothing tip, cutting tip, tip interchange
list
wrench and supply of solder. Model 8250AK.
100 Watt Gun and Solder Dispenser
A combination for faster, easier, better soldered connections-particularly in difficult to -reach spots. 100 -watt Weller Gun heats
instantly. Weller-Kormat Dispenser feeds and
supports the solder, prevents hand contamination that causes faulty connections, $0195
prevents finger burns. Model WK81 set.
list
On sale at your Electronic Parts
WELLER ELECTRIC CORP.
Distributor
.
EASTON, PA.
April,
1962/PF REPORTER
97
figures vary from 4.1 to 5.5 db
across the low band, and from 5.4
to 7.0 db over the high band.
Jerrold also makes the Model
DSA-12 De-Snower
a tube -type
preamp for use in distribution systems. The unit has an average gain
of 25 db across the band and its
noise figure varies from 6 to 7.5 db.
-
JFD Model TNT100
Fig. 7. Jerrold Model APM-101 "Power mate" preamp and AC power supply.
1
®IUD
mml
U
I15 mml
#11-13VDC
100 mml
The antenna -mounted Transistenna shown in Figs. 9 and 10 employs a PADT transistor in a common -base amplifier circuit (see Fig.
1) The power supply utilizes four
flashlight batteries to provide 6 volts
show the gain to be 18.25 db for
Channel 2 and 13.9 db for Channel
13. The gain varies from 12 db to
18.2 db over the FM band. Noise
X]
PONER SUPPLY
.
Fig. 8. Schematic of the Jerrold Model
APM-101 amplifier and power supply.
,:c1c£043>
\\\)--\---"ozd
Fig. 9. JFD Model TNT -103 remote pre amp and AC -operated power supply.
Model
1571
Shown with Accessory
45
rpm Spindle in Base Plate Spindle Well
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Stereo Installations! Sell customers a combination of true transcription turntable fidelity and automatic record changer convenience
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unit with this functional V -M 'Stere-O-Matic'©! The eleven -inch turntable,
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VM
98
PF
CORPORATION
BENTON HARBOR, MICHIGAN
REPORTER/April, 1962
KNOWN
FOR THE
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IN
of 144usic®
RECORD CHANGERS, PHONOGRAPHS AND TAPE RECORDERS
Fig. 10. JFD Model TNT -103 with amplifier and power -supply covers removed.
Outperforms them all !
Outsells them all
s
3
!
On
6
FULL OUTPUT
FOR
1st
2nd
SET
SET
3rd
SE
7
4th
SET
Sff
Fig. 11.
TNT-103
Schematic of the JFD Mode
amplifier and power supply
for the remote amplifier. A multiple secondary transformer is used to
provide impedance matching, so that
four sets may be operated simultaneously.
According to JFD specifications,
the amplifier gain varies from 18 db
on the low channels to 10 db on the
high channels. The same amplifier
is also available with an AC supply,
designated as Model TNT103-AC.
Winegard Model MA-300
The Tenna-Boost amplifier (Fig.
TRANSISTOR
POWERMATE
PREAMPLIFIER
BY FAR THE BEST antenna preamplifier in the business-that's
POWERMATE! On black -and -white, and where it really counts-on
color TV-POWERMATE's superiority shows up across the country.
The better VSWR (impedance match), flat response, ultra -high
gain, special broad -band neutralizing transformer, and better power supply filtering-all add up to an outstanding product. No polarity
transistor protected from lightning no call-backs
problems
remote a -c power supply feeds 2 sets.
coupled surges
Step up to POWERMATE, and step up to a tremendous new profit
opportunity. See your Jerrold distributor now.
Model APM-1O1 $39.95 list, complete
...
Winegard MA -300 antenna mounted amplifier and power supply.
Fig.
12.
...
...
JERROLD ELECTRONICS CORPORATION
32, Pa.
Export: CBS International, New York
Distributor Sales Division, Dept. IDS -222, Philadelphia
Jerrold Electronics (Canada) Ltd., Toronto
.
April,
22. N.Y.
1962/PF REPORTER
99
IN THE
PF REPORTER
I
EFFECTIVE USE OF
SERVICE
...
with
CHEMICALS
a cross-
reference chart of all
types on the market.
Fig. 13. Cutaway view of Winegard
MA -300 showing internal construction.
REPORT ON THE
NEW YORK UHF TEST
12) is antenna -mounted and employs an MADT transistor as a common -emitter preamplifier (see Figs.
13 and 14) The manufacturer's
specifications show an average gain
of 18 db on the low band and 14 db
for the high band. The noise figure
varies from 3.8 db on Channel 2 to
4.9 db on Channel 13. A high-pass
filter circuit is provided at the input
to reduce interference from Citizens
The story behind
the FCC's $2 million experiment with a channel 31
station, being operated for comparison with New York City's seven VHF's.
.
TV TUNER
TROUBLESHOOTING TECHNIQUES
.
.
will show you how to take care of
most tuner defects right in your own shop.
.
band transmitters.
The system is AC -powered and
has provisions for feeding two receivers, either TV or FM. This pre amp, and others of similar design,
are supplied as part of especially designed "electronic" antennas.
NOTES ON TEST EQUIPMENT
Evaluating B & K 375 VTVM
1100 Tube Tester
-
EICO
-
680 Transistor Tester
Mercury
HOW TO EXTEND CREDIT WITHOUT GOING BROKE
...
will tell you where to turn for outside sources of customer credit.
SURE CURES
...
FOR REPEAT TUBE
BURNOUT
Conclusion
will shod light on abnormal circuit conditions that carry tubes
The units described are typical of
those available on the market at this
time. Further details on these and
other preamplifiers are contained in
the chart at the beginning of this
article.
to an early grave.
RADIOTV SUBSTITUTION STOCK GUIDE
..
. a suggested
inventory of transformers, filters, and other major
parts to keep on hand in the shop.
Free Premium Books With New or Renewal Subscriptions
The
s
INDUSTRIAL
Troubleshooter
Handbook
..-
ELECTRONICS
.-...
C1
Enter my subscription to PF REPORTER
and send me free book (s) checked.
3 Years $9.00
n
Years $7.00
The Troubleshooter's Handbook
Servicing Industrial Electronics
Servicing TV from Tuner to Picture Tube
Bill Me
Remittance Enclosed
Take this coupon to your
distributor, or mail to:
Howard W. Sams & Co., Inc.
2201 E. 46th St., Indianapolis 6, Ind.
1
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i
i
Ej Extend Present Subscription
Please Check Your
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C2
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Independent Radio,
TV Serviceman
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Service Mgr.
Employee
ics Service
Other (Specify occupation and title)
Address
City
2
Zone_Stete
14. Schematic diagram of Winegard MA -300 preamplifier and supply.
Fig.
OUTPUT
2
OUTPUT
1
Freak Rasters
(Continued from page 33)
7/10 AMP
250V
.
FROM 5V3
LV
RECT
is
270V
O80
BY
CI
mid
SOURCE
1000
1W
40 mfd
TO AUDIO
MAKING ROOM AT THE TOP
u
`.;
^M
V
T
,
<.
",
, -"
Ill fMf
OeG``
OUTPUT
TRANS
10
DAMPER
mid
6DE4
TO
& AMPLIFIER #250
.No..E
Wired $79.95
NaNEW ."..«.,.,a Kit $49.95
.
l
.a' ,..
AC VTVM
-., " tcri
I
*+,
FLYBACK
t
Phenomenally good AC VTVM, bound to
make room for itself at the top of the pro fessional market. 12 ranges from 1 my to
300 V full-scale, 10c-600kc ±0 db response,
10 megohms input impedance, ±3% of full
scale accuracy. At the flick of a switch, the
internal wide -band amplifier is available for
external use. Provides 8c-800kc ±0 db response, 5 VRMS output, 5 kilohm output
impedance, gain control, noise -40 db.
Regulated power supply, frame grid tubes.
AC VTVM
Fig. 6. Flyback pulses were present on
All the precision VTVM facilities of the #250, less
the external use of the wide -band amplifier.
270 -volt line because CIB was open.
Artistic Etching
The pattern in Fig. 7, which reminded me of a white - on - black
etching of a candle and candle holder, remained fairly steady on the
screen of a Motorola Chassis TS 533. I was reasonably sure it was
due to filter trouble of some sort, so
I proceeded to scope the electrolytics throughout the set. To my
surprise, there was not just one bad
filter; the ripple waveforms on all
three sections of Cl (for circuit locations, see Fig. 8) were several
times their normal amplitudes. Apparently, the common connection inside the can was open. As I shunted
each individual section with a
good unit, the raster presentation
er
The
-
.,.
--='-tei
#680
Kit $25.95
Wired $39.95
Measure ICEO, ICBO & dcß directly, ac(3 indirectly, without charts or
special settings-plus all dc volts, currents, and resistances needed
to service transistor equipment. 50 kA, 31/2" face meter movement
provides sensitivity and scale length necessary for accurate measurements. Built-in 20,000 ohms/volt VOM facilities let you work on
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SITTING DUCKS
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ate
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IN -CIRCUIT CAPACITOR TESTER
#955
Wired $39.95
Kit $19.95
Leave those capacitors where they are! Without unsoldering:
-check for shorts (even in the presence of as little as 1 ohm shunt
resistance)
-check for opens (determine the presence of as little as 5mmf in
the circuit), and to confirm open indication
-measure capacitance with ±10% accuracy between 0.1 mf and
50 mf
-measure RC product, convertible into dissipation or power factor.
...
Kit $43.95
Wired $52.95
U
E/O/ /
)
call!"
e .:..
TRANSISTOR AND CIRCUIT TESTER
:10fí4
match your radio phono repair job
r
Y.,
Battery
Eliminator
and Charger
& raise you one color -TV service
,
>
THE TRANSISTOR GAME
Also New From EICO:
"I'll
`
ARMED TO THE
TEST LEADS FOR
changed; at one time, it became
very similar to Fig. 5. Replacing the
entire can restored completely normal operation.
Musical Top
The raster in Fig. 9, the most unusual I have yet encountered, was
found on the screen of a G -E Model
17T101. Scope checks of the filters
in this set were unproductive, so I
proceeded to check another likely
the horizontal output cirsuspect
Kit $44.95
Wired $72.95
#255
Add 5% in the West
AC Bench
Iwc
Supplies:
Model 1073Kit $35.95
Wired $47.95
Model 1078Kit $42.95
Wired $54.95
AC Volt -Watt
t
-
Meter »260
Kit $49.95
Wired $79.95
For complete catalog of over 106EICO kits and wired umis-hrfl, test equipment,
citizens radio, ham gear-plus name of nearest distributor, write to dept. pF-4
ELECTRONIC INSTRUMENT CO., INC., 3300 N. BLVD., L. I. C. 1, N. Y.
Export Dept: Roburn Agencies. Inc. 431 Greenwich St., N. Y. 13, N. Y.
April, 1962/PF
REPORTER
101
7. Electron -beam artistry on the
screen of a Motorola Chassis TS -533.
Fig.
Tarzian 400 and 600 volt F and H series
units are available in handy Ten-Paks,
in Doubler Replacement Kits, and in
bulk; M150 and M500 units are available in Conversion Kits and in bulk.
Nine standard tube replacement rectifiers replace over 95% of all popular
vacuum tube rectifiers; S5347 replaces
6BW4 or 12BW4 in Citizen's Band
radios; your 50 to 500 ma requirements
are covered by four "condensed
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Sarkes Tarzian has made more efficient-and smaller-than before.
Sarkes Tarzian
...the preferred si/icon rectifiers
that mean fewer call-backs
Tarzian silicon rectifier dependability virtually eliminates
call-backs that waste your time and profits. Units are available
immediately from distributors throughout the country ... in the
shapes, sizes, and specifications you need to do your work
quickly and easily.
Tarzian's industry -wide reputation for high quality at a pacesetting low price is a basic reason why more technicians like
yourself prefer Sarkes Tarzian rectifiers than the next two most
popular makes combined.
That statement is firmly based on the results of a 1961 mailing by Brand Name Survey, an independent research organization, to 23,000 service technicians in all major market areas of
the United States, covering 36 states. You're in good company
-and lots of it-when you make Tarzian rectifiers your first
choice for replacement applications.
cuit. The sawtooth trace at the control grid of the 25BQ6 output tube
was thoroughly normal; but my next
check, at the screen grid, produced
the abnormal trace shown in Fig. 10.
The frequency of this pulse signal
was 60 cps, and its peak -to -peak
amplitude was approximately 100
volts.
The B+ line on the other side of
the screen resistor was clean, so the
waveform was obviously originating
in the output stage itself. But what
could produce 60-cycle interference
at this point? The most probable
answer was a short or leakage between the filament and screen circuits
either inside the tube (not
too likely) or in the external circuit
wiring. Opening the high -voltage
cage to get at the 25BQ6, I found
the solution to this puzzler. At some
previous time, the dropping resistor
in the series filament circuit and the
horizontal -output screen resistor had
the former
both been replaced
with its correct replacement, and the
latter with several units in parallel.
As pointed out in Fig. 11, a short
had developed between the leads of
the filament and screen resistors.
Removing this short did not restore
a normal raster; in fact, it resulted
in no raster at all. This condition
was easy to cure, though; after find'ng an extremely low voltage on the
-
-
AUDIO OUTPUT
6W6GT
5U4Ca260V
RUTsouecE
FROM
LV
()AI
40 mfd
200 mfd
Free Tarzian "Distributor Line" catalog is available now
as your guide to replacement rectifier quality. Ask your
nearest Tarzian distributor for your copy.
TO CATHODE OF
VERT OUTPUT
145V
SOURCE
750 0
a
VERT
° 60
C
LINEARITY
mfd
260V
68K
6800 0
2W
O
SARKES TARZIAN, INC.
T
mfd
BOOST
World's Leading Manufacturers of TV and FM Tuners Closed Circuit TV Systems Broadcast
Equipment Air Trimmers FM Radios Magnetic Recording Tape Semiconductor Devices
SEMICONDUCTOR DIVISION
In Canada: 700 Weston Rd., Toronto 9
102
PF
REPORTER/April, 1962
BLOOMINGTON, INDIANA
Export: Ad Auríema, Inc., New York
Fig. 8. All three
lytic
capacitor Cl
sections of electro
were inoperative
Fig. 9. Raster on an old General Electric set looked like a spinning top.
screen, I soon discovered that the
wire -wound screen resistor was open
and that the other resistors had kited
to very high values. Replacing all
these resistors with the recommended types put the set back in
business.
Partial Blackout
Troubleshooting the causes of unusual rasters is often difficult and
time-consuming. It is even more so
when the unusual raster condition is
not steady but intermittent, as in a
Philco Model 50T1600 I once serviced. An inky -black shadow would
cover the right half of the screen, as
shown in Fig. 12, after about ten
minutes of normal playing. The defect would remain for about one
back to
minute, and then, zing!
normal. Ten minutes later, the condition would repeat itself.
My first inclination was to blame
the damper circuit, but I dropped
this thought when I remembered
that damper -circuit defects darken
the left half of a raster more seriously than the right half. Then I recalled a circuit peculiarity of this
model, not found in any other receiver to the best of my knowledge:
The B+ line to the sweep circuits
has its own filter choke and capacitor (L2 and C3 in Fig. 13) . Hook -
-
Id's
an emergency!
ab®
I'm out of Ce
Ceramic Capacitors!
There's no need to fly off the handle when
you need a ceramic capacitor. Just taxi
down the field to your nearest CENTRALAB
distributor. He has the unit you needwhether it's plane or fancy.
CENTRALAB piloted the ceramic capacitor
to its present importance in electronics,
and today is flying high with the most
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CENTRALAB'S
THE ELECTRONICS DIVISION OF GLOBE -UNION INC.
Centitalab.
942D EAST
KEEFE AVENUE
MILWAUKEE 1, WISCONSIN
In Canada: Centralab Canada Ltd., P.O. Box 400, Ajax, Ontario
D-82118
Fig. 10. These 60 -cps pulses appeared
on screen of horizontal output tube.
ELECTRONIC SWITCHES
VARIABLE RESISTORS
PACKAGED ELECTRONIC CIRCUITS
CERAMIC CAPACITORS
ENGINEERED CERAMICS
Aoril, 1962; PF
REPORTER
103
to the AC plate load of the horizontal output tube when C B lost
its ability to bypass these compon1
ents.
One other factor helps in shaping
unusual rasters: A B+ or boost
line with defective filters may feed
back unbypassed signals to other
circuits in the set, where they can
modulate the beam of the picture
tube. Such beam modulation is not
necessarily confined to the control
grid or cathode of the picture tube,
but can result from the unbypassed
signals being fed to the focusing and
accelerating grids as well.
i
Fig. 11. Short between screen and
fila-
Fig. 12. In an old Philco, right half
of screen intermittently blacked out.
ment resistors (arrow) was the culprit.
ing the scope probe across this capacitor, I sat back to watch and
await the partial blackout. When it
did take place, I was happy to note
that the scope trace changed from
rather heavily loaded by the vertical
output circuit. Since the current
drain of this stage is least when the
CRT beam is at the top of the
screen, the raster in Fig. 3 is most
nearly normal at this point. As vertical sweep proceeds downward, the
current drain on the crippled boost
circuit increases, and the raster
tapers off because the vertical circuit
robs current from the horizontal cir-
a perfectly normal ripple waveform
to the 40 -volt wave shown in Fig.
14. C3 was definitely the culprit.
Why Such Strange Symptoms?
It's interesting (and educational)
to analyze the reasons why rasters
assume such unusual shapes as a result of defective filter capacitors.
One factor is the changing current
drain in the circuit containing the
filter. For instance, the boost capacitor in the G -E circuit of Fig. 4 is
A
Virtual Encyclopedia
... available to
On
Testing Electrolytics
Since so many freak raster conditions are traceable to bad filter
capacitors, you may wonder, "Why
not just shunt suspected filters with
good ones?" I have a very good reason for replying, "Don't." When the
new capacitor comes into contact
with the circuit, it may cause the
defective electrolytic to heal temporarily, and the trouble to disappearalso temporarily. When this happens, you may feel pretty sure that
the shunted capacitor was defective,
cuit.
Another factor in some odd troubles is the mismatch between the
horizontal output tube and its plate
load. For instance, in the Zenith set
of Fig. 5, R59 and other components in the B+ circuit were added
Servicing
KRYLON CLEANER
LUBRICANT SPRAY
NEW
you in back issues of PF REPORTER
... and they're yours for just 50c a copy
service
volume controls,
tuners,
switches
To
1956
all except
Jan -Oct
1958
1960
all except Jan,
Feb, Mar, Apr,
all except Jan
and May
and June
1957
1959
all except
Mar, Aug, Oct,
all except
Nov, and Dec
Nov and Dec
Just place an
"X"
in the appropriate boxes for each issue ordered. Enclose
check or money order-sorry, no C.O.D.'s.
Special!, Order
JAN.
1961
all except Apr
6
issues or more and save 10c a copy.
MAR.
FEB.
1956
APR.
r MAY
JUNE
JULY
AUG.
SEPT.
OCT.
1958
1959
1960
Enclosed please find
DEC.
KRYLON
1957
1961
NOV.
Cleans away dirt and gummy deposits. Provides a nondrying
lubricating film on contact surfaces. Gives long-lasting protection against corrosion. Comes with 5 -in. flexible plastic
hose for controlled spraying in hard -to -reach places.
CRYSTAL-CLEAR
ACRYLIC SPRAY
SPRAY PAINTS
Protects electronic parts.
Choice of 24. standard
colors and 7 glowing
Use on TV,
radio, hi-fi,
1
transmitting or test
$
Protects
against humidity, dust,
equipment.
for back issues the ked above.
corrosion and leakage
currents. Long lasting.
High dielectric strength.
Mail to: Circulation Dept., PF REPORTER
2201 E. 46th St., Indianapolis 6, Ind.
KRYLON
fluorescent spray paints.
Use for touchup, color
coding, safety, or repainting cabinets and
enclosures. DRY IN
MINUTES.
...
If you prize it
KRYLON-ize itl
Contact your Radio-TV jobber or write for
Krylon's new industrial products catalog
NAME
STREET
KRYLON, INC., NORRISTOWN, PA.
CITY
462
ZONE
STAT
ano
:
BLiCK :
BOOST VOLIAGR
TO NOR
VERT
ZAND
050
11000
SCREEN
a
OR
DAMPER
5V4G
TOSSCON ARI
TO
FIIBACK
NOR IZ OUTPUT
mib
TO VERT
OUTPUT
IORIZ
YOKE
MORIZY
LINEARITY
TOBE
90
SOURCE
Fig. 13. How B - is supplied to sweep
circuits of the Philco Model 5071600.
and proceed to install a replacement.
If you do this, you're overlooking
something. The initial current surge
was not confined to the capacitor
shunted, but extended to any others
in parallel with it or in associated
circuits. Borderline defects in these
other capacitors could also be
healed. For example, shunting a capacitor on the 150 -volt line might
easily create a surge that would heal
a defective unit on the 250 -volt line.
The effect of this surge might last
for days, but it will invariably wear
off. If the set has been returned in
the meantime, a callback will most
surely result.
Such confusion can be avoided by
using a capacitor - substitution box
with a surge -preventing feature, or
by checking ripple waveforms with
a scope (as I do) to locate a filter
that is not doing its job.
Although checking electrolytic capacitors is usually a good place to
start analyzing an odd raster trouble
you've never encountered before, I
don't mean to leave the impression
that filters are practically the only
source of such trouble. TV sets have
many other ways of trying to, outwit
servicemen with freak symptoms.
However, they're no match for the
professional technician who knows
how to think his way out of a tough
.)roblem.
GUARANTEE
guaran-
88 is unconditionally
of receiving
Each Seco Model
for the testing
will be
upbe
data
teed to
or set-uep p
kits
r tester curtype tubes. Adaptor to
cost
nwe
from datte of purchase.
rent for one y
Af
t16101111114,1111111111414,1111111111111
A SECO PLUS!
New Seco Model 88 Tube Tester is guaranteed against
obsolescence. Gives you patented Seco GRID CIRCUIT,
also CATHODE EMISSION tests-tests over 2,200 tube
types including Nuvistors, Novars, Compactrons, new 10 pin types and battery types. You also get:
A check for troublesome grid
emission and all common leakage and short faults in one
operation. READ ON METER.
A cathode emission test in spe-
cial low impedance circuit.
controls-simple operation
-compact, lightweight size.
Few
Convenient fast -find setup information in cover.
A check for filament continuity
and open elements.
A burnout -proof meter employing a VTVM amplifying circuit.
For full information write or send coupon below to Seco,
originator of the famous Grid Circuit Test.
1
Ir
SECO
ELECTRONICS, INC.
5031 Penn Ave. So., Minneapolis 19, Minn.
_,n..,_..---...,,;R-r".--;
.
Please send free
Model 88 information
"How to Test Tubes"
NAME
ADDRESS
Fig. 14. When C3 opened
intermittent-
ly, this 40 -volt ripple was on
B-
CITY
STATE
line.
April, 1962/PF REPORTER
105
Replacement Pressure Pads (41M)
A package of felt pads de-
For further information on any of the following items, circle
the associated number on the Catalog & Literature Card.
signed to replace worn tape recorder pressure pads is available from Robins. The pads,
which come in packages of
40, are intended to eliminate
troubles that occur when old
pads wear through or become
hardened with age. Virtually
any model of recorder available
today can be serviced from the
assortment, which lists at $1.00
for a package.
Tube Caddies (39M)
"Protecto-Com" Display
tube caddies,
with a vinyl covering, is now
available from Argos Products
Co. The largest model (TC -5)
has a volume of 3300 cu. in.
and contains a tool tray with
23/4" clearance. Other models
include the TC -4, the TC -100,
and the TC -201. Prices range
from $21.95 for the TC -5 to
$9.95 for the small TC -201.
A new line of
VHF/UHF Antenna (40M)
360° horizontal
dispersion
characterizes the "Big Wheel,"
a clover -leaf antenna by Cush
Craft. The unit mounts on a
3/ " to 11/2" pipe and can be
used for either amateur or commercial service. A single bay
has approximately 5 db gain
over a halo type, while a twobay unit gives 5.5 db over the
single bay. If more gain is desired, a four -bay arrangement
will give a 7.5 db over the two -bay. Bandwidth is over 4 me
with an SWR of 1:1.2 or less.
JUST WHAT YOU NEED
FOR TESTING TRANSISTORS
(42M)
The door -answering and fire detection features of the Progress Webster "Protecto - Com"
are emphasized in a dealer's
display. Mounted in the display
intended for use on a counter,
shelf, or in a window are an
IR -6 and OR -1 Remote Station
and an FB2 Thermo Button.
The display measures 15" x
22" x 4", and is priced at
$14.45 including equipment.
Antenna Coil Assembly (43M)
high -efficiency balun coil
and a three -section IF trap designed to eliminate interference
between TV sets are contained
in the Colman antenna -coil assembly replacement for RCA
and Admiral tuners. Mounted
on a phenolic -board and metal plate assembly, the No. 1359A
will simplify the replacement of
defective antenna coils in these
TV sets.
A
NEW! SARGENT
ELECTRONIC CHEMICALS
and FINISHES
.
SARGENT TUNER CLEANER
Plug this instrument into any 60
cps, 95/130 volt
circuit and get a
stabilized source
of direct current,
adjustable over a
range from 0 to
AC to DC
45 volts DC, with
current output
ER
Filtered
0/2.5 amperes.
direct current output range 0/45 volts, 0/2.5
SUPPLY
amperes is continuously adjustable
and stabilized y-1% at any setting
regardless of alternating current
fluctuation. Voltage regulation is
approximately 5% between full load and no load at full
voltage setting.
This DC Power Supply instrument is ideal for use in transistor testing, circuit testing, to provide regulated voltage
for light testing, eliminates the need of batteries by supplying exact DC voltage required.
Write for Bulletin 17-BLO1 which gives fúl1 details and
models available.
POW
i
ACME ELECTRIC CORPORATION
944
Water
St.
snn,+ºv/,ºsz
Cuba, N. Y.
Thoroughly cleans tuners and controls.
Protects against future corrosion, oxidation and contact wear. Non-flammable.
Dealer
Giant 16.4
Net
Ounce Can
Includes plastic extension tube.
,SARGENT
TUNER
CLEANER
II
SARGENT GEAR AND PARTS CLEANER
Instant cleaning power for turntables,
tape recorders, business machines and
electronic devices. Flushes away dirt, oil
and grease in gears and parts. Non-flammable.
Dealer
Giant 16.4
29
G
Ounce Can
Includes plastic extension tube.
OTHER PRODUCTS IN THE SARGENT ELECTRONICS LINE
Red Insulator, Degreaser, Clear Acrylic Plastic, Penetrating Oil,
Squeak Stopper, Enamels, Lacquers, Metallics, Engine Enamels,
Stop Rust, and other Specialties.
For Free Literature and Prices, Check Your Electronics Parts Distributor,
or
write... ELECTRONICS DIVISION
THfsa1r9@IZt-Ce1r.ke
Producer of Paints and Chemicals for
P. O. Box 729
106
PF
REPORTER/April, 1962
INDIANAPOLIS
Over 60 Years
6,
INDIANA
ce®
DC -AC
Converter
(44M)
UHF
275 watts of 60 -cycle power
Featuring a wire -grid reflector that concentrates the re-
available from the Terado
50-191 "Continental"
converter. The unit converts a
12 -volt DC battery potential
is
Model
ceived signals on its two -bay
solid dipoles, the "Sonata"
Model TA -149 by JFD, is merchandised in a 3 -color protective package. This antenna has
sharp directivity, high gain,
high front -to -back ratio, and
plastic -tipped legs for increased
into 115 volts AC which can
be used to power such appliances as shavers, dictating ma-
chines, tape recorders, and portable TV's. The 60 -cycle frequency is maintained within 1
cycle regardless of changing load or input voltage. Dealer net
is $116.34.
Citizens Band Transceiver (45M)
The transmitter and receiver
sections of the E. F. Johnson
"Personal Messenger" are crystal -controlled, and the superhet
receiver has a tuned RF amplifier. This two-way radio is
intended primarily for limited range CB operation requiring
no FCC license. The standard
model is powered by eight "pen lite" cells mounted inside the
case; however, a rechargeable
nickel -cadmium battery or a
cigarette -lighter plug for tapping an auto -battery source can
be obtained as an accessory.
Also available is a leather case
with shoulder strap.
mechanical stability. The TA149 carries a list price of $8.95.
RF
Paging System (48M)
A staff -locating system using
radio frequencies is available
from Multitone Electronics. The
system solves problems encountered in installation of
"Personal Call" induction -loop
systems in large areas where a
wired loop is impractical. When
a key is pressed on the encoder,
a "beep" signal is heard by the
person being paged. The receiver requires one battery and
is constructed of aluminum and
plastic.
Replacement Picture Tubes (49M)
Three new "universal" picture-tube types are available
from Sylvania. The 2ICBP4A, 24AEP4, and I7DKP4 will replace 20 popular types now in use, and do not require use of
an ion trap. When substituted for an original type which incorporated an ion trap, the magnet assembly should be discarded. Almost one-fourth of the service shop's replacement
picture -tube needs can be handled with these three types.
Flybacks (46M)
Three replacement flyback transformers have been added
to the Stancor line. Intended as exact replacements for Motorola parts, these units are available for immediate delivery.
HO -342 replaces Motorola 24C740969 and 24C742676; HO 343 replaces 24C744042; and HO -344 replaces 24K748397
and 24K754273 -Z.
GENERAL ELECTRIC
Antenna (47M)
NEIN
mill EDITION
TRANSISTOR MANUAL
NOW OVER 400 PAGES OF CIRCUITS,
APPLICATIONS, THEORY
... 17 circuits you can use to
build audio amplifiers, simple or complex receivers, a
transistor tester, an audible automobile signal minder
(you hear your turn indicator), code practice oscillators, a tachometer, and many more
information on stereo, hi-fi,
Expanded Hi-Fi chapter
amplifiers, preamplifiers, including circuits for very
New Experimenter's chapter
.
versatile
12
.
.
watt transistorized stereo amplifiers,
matched preamps with base and treble controls, for
use with ceramic or magnetic cartridge or tape deck
Expanded Radio Receiver chapter ... with circuits for AM
and FM receivers and tuners
complete explanaHow to use a Transistor Spec Sheet
tion of how to interpret a spec sheet, most important
characteristics, parameters
.
.
.
PLUS an expanded "Reader's List" of basic reference works
on transistor theory and application, a new chapter explain-
ing transistor reliability, expanded and updated comparison
charts, outline drawings, over 1200 JEDEC types. This is the
at
kind of reference information you just hare to hare
home or on the job. See your G -E Semiconductor Products
Distributor for yoor r,qiy of the sixth edition of this industry
classic, or send '.00 v,ith the coupon.
...
rIGeneral
Electric Company, Semiconductor Products Department
Section 324128, Electronics Park, Syracuse, New York
6th Edition of the General
enclose $2.00. (No stamps, please.)
Please send me the new 420 page
I
Electric Transistor Manual
I
Name
I
I
I
I
Address
GENERAL
ELECTRIC
Zone
i
State
LCity
April, 7962
PF
REPORTER
107
CATALOG AND LITERATURE SERVICE
INDEX TO ADVERTISERS
ANTENNAS & ACCESSORIES
April, 1962
Acme Electric
Corp.
106
Argos Products Co.
11-12
ATR Electronics
73
B & K Mfg. Co.
19, 21, 23
Belden Mfg. Co.
77
Berns Mfg. Co.
76
Blonder -Tongue Labs
88
Bussmann Mfg. Div.
89
Castle TV Tuner Service
93
Centralab, A Div. of Globe -Union, Inc.
103
Chemtronics, Inc.
44
Duotone Co., Inc.
96
EICO Electronic Instrument Co., Inc.
101
Electro -Voice, Inc.
81
Electronic Chemical Corp.
80
Fisher Radio Corp.
90
General Electric Co.
56,57,107
Grantham Schools, Inc.
29
Heath Co.
61
JFD Electronics Corp.
50-51
Jackson Electrical Instrument Co.
70, 108
Jerrold Electronics Corp.
99
Krylon, Inc.
104
Littelfuse, Inc.
4th cover
Los Angeles Tuner Exchange, Inc.
54
Mallory & Co., Inc., P. R.
71
Mercury Tuner Service, Inc.
96
Merit Coil & Transformer Corp.
84
60
Miller Co.. J. W.
-
BLONDER -TONGUE- 30 -page "howto -do -it" book explaining master TV
systems from basic principles to actual
installation planning. See ad page 88.
2M. JFD-Descriptive and promotional literature plus sales aids for new TransisTennas; also complete set of specifications for outdoor and indoor TV antennas and accessories, including exact -replacement antenna data. See ad
pages 50-51.
3M. MOSLEY-20-page catalog listing complete line of antennas and accessories;
includes information on coaxial fittings
and couplers.
4M. WINEGARD-Factfinder No. 201 giving
complete specifications for Model PF -8
Stereo-Tron antenna for FM multiplex
receivers; includes schematic diagram.
See ads pages 78, 79.
1M.
Perma-Power Co.
62
Philco Corp.
Parts and Service Operations .-_._____ 75
86
Planet Sales Corp.
85
Precision Apparatus Co., Inc.
Precision Electronics, Inc.
86
Precision Tuner Service
80
69
Quam-Nichols Co.
86
Quietrole Co.
63, 3rd cover
RCA Electron Tube Div.
.
.................
RCA Institutes
RCA Parts & Accessories Div.
RCA Sales Corp.
Rider Publisher, Inc., John F.
22
30-31, 65, 95
24-25
Raytheon Co.
Rohn Mfg. Co.
Sams & Co., Inc., Howard W. _.54,
Sargent -Gerke Co.
Sarkes Tarzian Co.
Semiconductor Div.
Tuner Div.
Tuner Service
Seco Electronics, Inc.
42
87
92
68, 72, 83
106
102
64
13
105
Sencore, Inc.
Sonotone Corp.
Sprague Products Co.
53, 55, 59, 91
20
15, 16
Standard Kollsman Industries, Inc. 2nd cover
Sylvania Electric Products, Inc.
26-27
Electronic Tube Div.
67
Technical Appliance Corp. (TACO)
80
Terado Co.
96
Texas Crystals
49
Triad Transformer Corp.
1-2
Triplett Electrical Instrument Co.
43
Tung -Sol Electric, Inc.
AUDIO & HI-FI
-M. EICO-New 32 -page catalog of kits and
wired equipment for stereo and monophonic hi-fi, test equipment, Citizens
band transceivers, ham gear, and transistor radios. Also, "Stereo Hi-Fi Guide,"
and "Short Course for Novice License."
See ad page 101.
6M.
also hi-fi catalog sheet No. HF 1061 -10 and sound -system catalog sheet.
See ad page 69.
7M. UNIVERSITY
12 -page catalog describing PA loudspeakers; also 4 -page
61;
-
brochure giving information on F-107
transistorized mobile siren and PA system, and 20 -page catalog containing
complete list of hi-fi speakers and systems.
COMPONENTS
8M. BUSSMANN
-
15, 16.
SERVICE AIDS
11M. BERNS
98
Vidaire Electronics Mfg. Corp.
Volkswagen of America, Inc.
Weller Electric Co.
Western Tuner Rebuilders
Westinghouse Electric Corp.
Winegard Co.
Xcelite, Inc.
e
T
-
2
'-'w
á
-
e
I
0
le
ó
0
x
g?:;
?:1.1
s
..4.5
,xS
18M.
30-31.
SENCORE-Reprint of article entitled
"Practical Approach to Transistor Radio Service" by Herb Bowden and Jim
Neumann. See ads pages 53, 55, 59, 91.
YEATS-Literature describing the new
Model 14 appliance dolly, featuring all -
aluminum I-beam construction.
-
SPECIAL EQUIPMENT
19M. ATR
Literature
.i
..
=
á
o
::sª
s
-?"a
tl""x.
c
sa
for any TV tuner. See ad page 80.
16M. RCA -Form TK310, "RCA Color Parts
and Accessories for Installation and
Service," listing replacement parts and
service aids for all RCA color TV receivers. Also Form TK -292, 28 -page
"TV Knob Directory," listing part numbers for all knobs used on 1955 through
1961 RCA TV receivers. See ads pages
e
f
seven new accessories for the Stethotracer. Includes microwave demodulator, vibration pickup, telephone pickup,
etc.
ELECTRONIC CHEMICAL CORP.Catalog sheet and brochure describing
EC -44, a spray that lubricates, conditions, and cleans all electrical contacts.
See ad page 80.
15M. PRECISION TUNER -Information on
repair and alignment service available
14M.
17M.
,P
r.
<
3
PF
*e_3
eS
REPORTER/April, 1962
.-
76.
-
8
s
3
108
i!
.
:i
c .
2
18
u
<
ó
78, 79
!
4
bender. See ad page
12M. CASTLE-Leaflet describing fast overhaul service on television tuners of all
makes and models. See ad page 93.
13M. DON BOSCO
Literature describing
97
76
45-48
-
Data on 3 -in -1 picture -tube
repair tools, on Audio Pin -Plug Crimper
that lets you make pin -plug and ground
connections for shielded cable without
soldering, and on ION adjustable beam
17
-
-
á
76
on VHF translators for extending TV coverage into
difficult reception areas; planning package to aid in establishing a translator
station; reprint of FCC rules covering
on new series of
Karadio models. Series 600 are tube
types, while Series 400 are transistorized. All sets available as "universals"
or customized. See ad page 73.
20M. CROWN -Literature on Defender burglar alarm that creates an electronic
shield around objects, rooms, or whole
buildings; also information on distributor and dealer franchises available to
qualified service companies.
-
translators.
22M. GEORGE
HARMON CO.
Catalog
sheet describing Model P -315A regulated
power supply that provides 0-15V at 3
23M.
amps.
PHILMORE
-
Catalog sheets describ-
ing complete line of test equipment,
power supplies and hobby components;
includes information on Model FS -1
field -strength meter kit.
24M. PROGRESS WEBSTER
Complete
specifications and price data on home
and business intercoms and paging systems. Includes information on Protecto
Corn home -protection system.
25M. TERADO-Catalog sheet describing the
Continental power converter Model No.
50-191; converts 12 volts DC to 115
volts AC. See ad page 80.
26M. VOLKSWAGEN
60 -page illustrated
booklet, "The Owner's Viewpoint." describing how various business enterprises use VW trucks in their operations; also booklet giving complete
specifications on VW truck line. See
ad page 17.
-
-
TECHNICAL PUBLICATIONS
27M. CHRISTY TRADES SCHOOL -Literature on various correspondence courses,
including one on electrical appliance
repairing.
SAMS-Literature describing all current publications on radio, TV, communications, audio and
hi-fi, and industrial electronics servicing. including 1962 Book Catalog and descriptive flyer on 1962 Test Equipment
Annual. See ads pages 54, 68, 72, 83.
28M. HOWARD W.
-
Compact new 64 -page
BUSS Television Fuse List, Form TVC,
giving servicemen a quick reference for
fuse replacements in old and new TV
sets; includes fuse information for car
and truck radios. See ad page 89.
9M. CLAROSTAT
1962 Dealer Service
Parts Catalog including complete line
of components for replacement use.
10M. SPRAGUE -Chart C-457 showing all
popular TV -radio -hi-fi service items (designed to hang on wall). See ads pages
.
V -M Corp.
QUAM-NICHOLS-General catalog No.
21M. EMCEE -Literature
TEST EQUIPMENT
29M. B & K -Catalog
AP18-R, giving data
and information on Model 960 Transistor Radio Analyst, Model 1076 Television Analyst, Dynamic 375 VTVM,
V O Matic 360, Models 700 and 600
Dyna-Quik tube testers. Models 440 and
420 CRT Cathode Rejuvenator Testers,
Model 1070 Dyna-Sweep Circuit Analyzer, and B & K Service Shop. See ads
pages 19, 21, 23.
30M. PRECISION APPARATUS
Catalog
describing complete line of test equipment for industrial electronics, audio,
FM and AM radio, and B & W and
color TV; includes prices and specifications. See ad page 85.
31M. RCA (PARTS & ACCESSORIES DIV.)
-Form TK -303 "Instructions for Color
Test Jig" No. 11A1015; Form TK -310
"Color Parts Rack & Accessories" No.
11A1014; Form TK -331 "Color Cross Reference." See ad pages 30-31.
32M. SECO-4 -page reprint of technical article on transistor testing; shows how to
perform tests with various instruments.
-
33M.
See ad page 105.
SENCORE-New booklet, How to Use
the SS117 Sweep Circuit Troubleshooter,
plus brochure on complete line of timesaver instruments. See ads pages 53, 55,
59, 91.
34M.
-
TRIPLETT Catalog sheet describing
Model 800 VOM, a versatile instrument
with 70 ranges, a 7" scale, and overload protection. See ad pages 1-2.
TOOLS
35M. VACO -Literature on new line of Bull
Drivers; also catalog sheets describing
4 -piece screwdriver set and solderlessterminal kit.
36M. XCELITE
Bulletin 1261 describing
transistor -radio Terminal Wrenches used
to remove spanner nuts on external antenna and earphone jacks. See ad
-
page
18.
TUBES
-
(ELECTRONIC DIV.)
Hitachi receiving -tube manual, giving
extensive specifications, basing diagrams, and outlines for complete tube
line; also catalog sheet with color
photos and descriptions of Hitachi
broadcast -band and two -band transistor
37M. SAMPSON
radios.
38M. SYLVANIA -Wall chart showing construction of typical color TV picture
tubes, utilizing cutaway diagrams in
color. Principles described are applicable to color tubes being manufactured
today. See ad pages 26-27.
This One Picture Tube...
21ALP4
21ALP4A
21BTP4
21ALP4B
21CBP4
21ANP4
21CBP4A
21ATP4
21ANP4A
21CBP4B
21CMP4
21ATP4A
21CVP4
21ATP4B
21CWP4
21DNP4
21BAP4
21BNP4
21FLP4
RCA -21 CBP4A UNIVERSAL SILVERAMA® PICTURE TUBE
may be installed in place of any of the above types, regardless of manufacturer.
Think of the simplicity, economy and efficiency of having just one picture tube type to take care of OVER
25% of your replacement needs. That's exactly what you get with the RCA-21CBP4A, one of a growing family
sockets with the
ox universal Silverama picture tubes designed to help you cover the maximum number of
left.
below
chart,
the
listed
on
types
are
universal
Other
minimum number of types.
Like all Silverama picture tubes, these universal types
Replacing
RCA Silverama "Universal" Type
are made with all -new electron gun, finest parts and
17BJP4
17ATP4
materials, and a high -quality glass envelope that has
17BUP4
17ATP4A
been thoroughly inspected, cleaned and rescreened
17BJP4
17CBP4
17AVP4
prior to reuse.
17CLP4
17AVP4A
Start simplifying picture tube replacement problems
21AQP4
21ACP4
now. See your Authorized RCA Distributor this week
21AQP4A
21ACP4A
21AMP4A
about the new line of universal Silverama picture tubes.
21BSP4
21AMP4
21AMP4A
21CUP4
21DEP4A
21DAP4
21DEP4
21DEP4A
21CZP4
24CP4A
24ADP4
24CP4
24CP4A
24QP4
24TP4
24VP4
24VP4A
24XP4
Silverama Picture Tubes are advertised nationally over NBC-TV
RCA Electron Tube Division, Harrison, N.J.
The Most Trusted Name in Television
WHAT'S
IN A
FUSE?
Only
a
fuse element, glass
& caps?
No! Every fuse carries
with it the skill and quality of its manufacturer
You can't reach out and touch or taste this
you can't even be sure it will do
its job when needed except
by purchasing from a company
that has the know how of 30 years
of manufacturing fine fuses.
LITTELFUSE
1865 Miner Street
Des Plaines, Illinois
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