RCA 76-C Consolette - American Radio History

RCA 76-C Consolette - American Radio History
BROADCAST AUDIO EQUIPMENT
Type 76-C
Studio Consolette
RADIO CORPORATIOn OF AMERICA
EnGInEERInG PRODUCTS DEPARTMEnT
CAMDEn, fl.
J.
IB-24483
BROADCAST AUDIO EQUIPMENT
INSTRUCTIONS
Type 76-C Studio Consolette
(MI -11624 CONSOLETTE)
(MI -11301-B POWER SUPPLY)
RADIO CORPORATION OF AMERICA
ENGINEERING PRODUCTS DEPARTMENT, CAMDEN, N. J.
PRINTED IN U. S. A.
448
1
Table of Contents
Page
Page
Technical Data
iii
Part I-Description
General
1
Associated Equipment
Microphones
Microphone Stands
Transcription Turntables
Transcription Turntable Cueing Amplifier
Recorders and Recording Amplifiers
Loudspeakers
Signal Lights and Relays
2
Power Supply
Equipment for Use with Telephone Line
2
2
2
2
2
2
2
2
..
.
Tubes
3
4
4
Wall and Floor Outlets
Conduit Terminating Box
4
Multiple Channel Switching Systems
4
Part II-Installation
General
5
Connections
7
Speaker -Relay Operation Table B, for
Two -Studio Operation
Light -Relay Operation Table B, for
Single -Studio Operation
Light -Relay Operation Table B, for
Two -Studio Operation
Operating Procedure
To Put a Program on the Air
Auditioning
To Cue the Studio from a Cue Line
To Cue Studio A from Studio B
Program Monitoring
Remote Cueing
To Talk Back to the Studio
To Talk Back Over the Remote Lines
Monitoring the Remote Lines
23
25
25
26
26
26
26
26
27
27
27
27
27
Recording
Transcription -Turntable Cueing
Emergency use of the Monitor Amplifier
for Broadcasting
27
Network Monitoring
27
27
27
Audio Input Connections
Audio Output Connections
7
Part IV-MI-11301-B Power Supply
8
Technical Data
29
Loudspeaker Connections
Recorder Connections
Transcription Turntable Cueing Amplifier
Connections
8
Description
29
Installation
Mounting
Connections
Field Supply
Emergency Switch
Hum Adjustment
29
8
9
Addition of Signal Lights and Relays
Consolette Signal Lights
10
Tubes
11
Conduit List A, for Single -Studio Installation ..
12
....
14
Conduit List B, for Two -Studio Installation
11
29
29
30
30
31
Part V-Maintenance
Part III-Operation
General
17
Switch Operation Table
19
Relay Operation
Speaker -Relay Operation Table A, for
21
Single -Studio Operation
23
Inspection and Checking
33
Care of Pushbutton Switches
33
Care of Key Switches
33
Tube Voltage Table
34
Replacement Parts
36
List of Parts
36
it
List of Illustrations
Figure No.
Title
Page
1
Type 76-C Consolette
1
2
Type 76-C Consolette with Chassis Raised
3
3
6-db Pad for Telephone Line
4
4
Typical Conduit Layout for Single -Studio Installation
5
5
Typical Conduit Layout for Two -Studio Installation
6
6
Installation Diagram
6
7
Mounting Dimensions
7
8
Connections for Single- and Two -Studio Installation
7
9
Mounting Bracket for Line Transformers
8
10
Loudspeaker Connections
8
11
Typical Recording Setup
9
12
Relay Mounting Diagram
10
13
Studio Signal -Light Connections
10
14
Control -Room Signal -Light Connections
11
15
Announce -Booth Relay Connections
11
16
Simplified Block Diagram of Type 76-C Consolette
18
17
Front Panel
18
18
Simplified Control Circuit Diagram for Single -Studio Operation
22
19
Simplified Control Circuit Diagram for Two -Studio Operation
24
20
Schematic Diagram, MI -11301-B Power Supply
28
21
MI -11301-B Power Supply
30
22
Mounting Dimensions, MI -11301-B Power Supply
30
23
Interior View of Power Supply
31
24
Rear View of Power Supply Chassis
32
25
Relay Mounting Plate
34
26
Wiring Diagram, MI -11301-B Power Supply
35
27
Monitor Amplifier
37
28
Preamplifier Assembly
38
29
Program Amplifier
40
30
Front Panel Wiring
41
31
Overall Wiring Diagram
43
32
Schematic Diagram, Type 76-C Consolette
45
111
TECHNICAL DATA
Power Required
One MI -11301-B Power Supply, or similar equipment
to supply the following:
D -C Plate Supply
Term.
Volts
a.
116
115
114
104
105
375
210
278
285
220
106 (Reg.)
106 (Emg.)
220
200
Milliamperes
62.0
1.2
5.1
42.0
4.6
21.0
13.0
A -C Filament Supply
Term.
Volts
b.
112 and 113
109 and 110
107 and 108
101 and 102
c.
Amperes
2.7
1.6
0.3
3.0
6.2
6.2
6.2
6.2
117 and 118
Milliamperes
Volts
60
100.0
Tubes
MI -11268 Tube Kit
1.
13 RCA -1620
2.
2 RCA -1621 for consolette
3.
2 RCA -1622
4.
1 RCA-5R4-GY
5.
1 RCA-5Y3-GT/G
for power supply
5000 ohms)
d. One 10,000 -ohm output for external recording (See
Installation)
e. One 600 -ohm unbalanced output for external transcription turntable cueing amplifier
Noise Level
68 db signal-to-noise ratio (Microphone input at -50
dbm, to program amplifier output at +18 dbm)
68 db signal-to-noise ratio (Microphone input to monitor
output at 4 watts, +36 dbm)
Gain
Microphone input to line output: 110 ± 2 db
Transcription input to line output: 110 ± 2 db
c. Remote line input to line output: 79 ± 1% db
d. Microphone input to monitor output: 108 ± 2 db
e. Remote line input to monitor output: 77 ± 2 db
f. Transcription input to monitor output: 108 ± 2 db
S. Cue input to monitor output: 36 ± 2 db
h. Talkback input to monitor output: 93
2 db
i. Microphone input to emergency line output: 91
2 db
Remote line through override: 27 ± 2% db
k. External record: 72 db ± 2 db when terminated by
a.
620 ohms
MI -11268-A Tube Kit*
1. 13 RCA -6J7
1.
2.
2 RCA -6F6 l for consolette
3.
2 RCA -6L6
4.
1 RCA-5R4-GY
1 RCA-5Y3-GT/G
5.
a. One 500- to 600 -ohm line
b. Three 15 -ohm monitor lines for speakers
c. One high -impedance headphone output (2000 to
b.
D -C Relay Supply
Term.
Outputs
for power supply
* May be used when maximum uniformity of characteristics, and minimum of microphonics, hum and
distortion are not required.
Remote talkback: 75 ± 2 db
Line Output Level
+18 dbm with 0.5% rms harmonic distortion from 100
to 7500 cycles and 0.65% rms harmonic distortion at
50 cycles
Frequency Response
a.
Microphone input to line output: ±2.0 db from 30
to 15,000 cycles
Inputs
a. Six 30- or 250 -ohm microphone inputs (balanced),
and two unbalanced
b. One 250 -ohm talk -back microphone input (bal-
b.
30 to 15,000 cycles (audition channel)
Monitor Power Output
anced)
Four remote -line inputs, 600- or 150 -ohm, balanced
a.
or unbalanced**
** When these inputs are to be used, two line- or bridging transformers must be connected between the remote lines and Mixers 5 and 6 as directed under In-
b.
c.
stallation.
d. Two 250 -ohm transcription inputs (unbalanced)
e. Five 20,000 -ohm monitor cue lines (balanced)
Microphone input to monitor output: ±2 db from
4.0 watts (+36 dbm) with 11/2% rms harmonic distortion from 50 to 7500 cycles
8.0 watts (+39 dbm) with 3% rms harmonic distortion from 50 to 7500 cycles
Dimensions and Weight
Width -39 inches
Depth -17 inches
Height -101/2 inches
Weight -135 pounds
1
TYPE 76-C CONSOLETTE
PART I
Description
GENERAL
The Type 76-C Consolette, MI -11624, is a complete broadcast -audio control unit. The major func-
tion of the consolette is to mix and amplify the
outputs of microphones, transcription turntables
and remote lines for broadcasts and auditions. Other
uses including monitoring, talk -back to the studio
or to remote points, studio cueing, transcription turntable cueing, and sending cues over remote
lines. When an external amplifier and recorder are
connected to the consolette, programs may be re -
RELAY MOUNTING PLATE
MONITOR AMPLIFIER
corded and monitored while they are on the air or
on audition.
The consolette contains six preamplifiers, six
mixers, a program amplifier, a monitor amplifier,
and three relays. Preamplifiers 1, 2, and 3 have fixed
microphone inputs. A switch connected to the input of preamplifier 4 may be used to select either a
studio microphone, or any one of two announce
microphones. Pushbuttons may be used to select
a microphone or transcription -turntable input for
preamplifiers 5 and 6, or to connect any one of
four remote -line inputs to mixers 5 or 6. Acoustic
PREAMPLIFIERS
PROGRAM AMPLIFIER
64056
Figure 1 - Type 76-C Consolette
2
feedback is prevented by the action of the three
relays, which automatically cut off any loudspeakers
Velocity Microphone. The Type 91-B Desk Stand
is recommended for the control -room microphone.
in the vicinity of a microphone that is on the air
or on audition.
Transcription Turntables
The consolette is particularly suitable for single studio operation at large stations; however it may
also be adapted for use as a complete control unit
for a small station that has two studios, a control
room and an announce booth. Detailed instructions
for both types of installation are given in Part II,
The Type 70-C and 70-D series of Transcription
Turntables are recommended for the transcription booth or control -room installation. These turnta-
Installation.
Transcription Turntable Cueing Amplifier
To permit transcription -turntable cueing, the con-
All components of the consolette are mounted in
a two-tone umber -gray cabinet having wooden sides
and a steel front panel. The cabinet is hinged at
the back so that it may be tilted for access to the
terminal boards on the base and the wiring beneath
the chassis. The lid of the cabinet is also hinged
to permit access to the tubes and relays. Four rubber -cushioned chassis containing the relays, the
monitor amplifier, the pre -amplifiers, and the program amplifier are mounted in the cabinet. On the
baseboard beneath the chassis are the four terminal
boards for external connections. (See fig. 2.)
A VU meter and all controls are conveniently
mounted on the sloping front panel of the unit. A
selector switch connected to the VU meter permits
testing of the pre -amplifier and program -amplifier
tubes from the front panel.
series of Recording Attachments.
solette may be connected to any one of the Type BA -
3 Series of Program Amplifiers, or the Type BA -4
Series of Monitoring Amplifiers.
Recorders and Recording Amplifiers
The Type 73 series of Professional Recorders are
recommended for high quality performance. The
Type BA -4 and BA -5 series of Recording Amplifiers may be used with these recorders.
Loudspeakers
A maximum of four loudspeakers may be connected to the consolette. For high-fidelity reproduction, use the Type LC -1A Loudspeaker, MI 11411. Cabinets for the LC -1A speaker are available
in umber -gray (MI -11401), and walnut (MI -11401-
A).
Signal Lights and Relays
ASSOCIATED EQUIPMENT
The following equipment or its equivalent
bles may be used with the Type 72-C and 72-D
is
recommended for a complete installation:
The MI -11706 series of studio signal lights are
recommended for the studio, announce booth and
control room. Lights are available with inscriptions
listed in the following table:
Microphones
The RCA 44 BX and KB -2C Velocity Microphones,
the 77-D Polydirectional Microphone, and the MI 6203 Series of Varacoustic Microphones are recommended for program pickup, the 88-A Pressure Microphone for announcing, and the MI -6226 Aerodynamic Microphone for talk -back. The consolette
may be connected to six studio microphones, a control -room announce microphone, a control -room talk -
back microphone, and a remote -announce, or extra
studio microphone.
STUDIO WARNING LIGHTS
MI- Number
MI -11706-1
MI -11706-2
MI -11706-3
MI -11706-4
MI -11706-5
Inscription
ON AIR
REHEARSAL
AUDITION
STAND BY
SILENCE
NOTE: The relays and additional equipment required for these lights are listed under Addition of
Signal Lights and Relays in Part II, Installation.
Microphone Stands
The best floor stand for use with the studio microphones is the Type 90-A Program Stand. Lower
priced stands such as the KS -1A and MI -4068-D
Floor Stands are also available. The Type 91-A
Announce Stand is specially designed for the 44-BX
Power Supply
The MI -11301-B Power Supply will supply the
necessary voltages for the consolette and its associated relays. The voltages required at the consolette are listed under Technical Data. See Part
3
Figure 2 - Type 76-C Consoleffe With Chassis Raised
The MI -11301-B Power Supply for complete
instructions on the power supply.
,
Equipment for Use With Telephonq Line
The consolette may be connected to four incoming 'remote lines, five incoming cue lines, and one
outgoing program line. The following equipment
is recommended for connection between the consolette and the telephone lines:
a. Line or Bridging Transformer. When the
line, a 600- to 600 -ohm pad should be connected
between the Output terminals rof the consolette and
the line. This pad (MI -4171-29) may be ordered,
or it may be constructed from the following components:
(1)
Resistor, 100 ohms-RCA stock number 34765 (4 required).
(2) Resistor, 400 ohms-RCA stock number 30498 (2 required).
The connections for the pad are shown in fig-
remote -line inputs are to be used, two line or bridg-
ure 3.
ing transformers must be connected between the
remote lines and mixers 5 and 6. The MI -11713
Line Transformer is recommended for installations
c. Jack Panels. The Type 33-A and 33-B Jack
panels will provide a flexible means of making input and output connections to the consolette. They
will be specially convenient for remote -line con-
at which the line level is between -30 and +10 dbm.
The MI -11712 Bridging Transformer is recommended for installations at which the remote lines
are connected, to a master control system. Since
the bridging transformer has a relatively high insertion loss (approximately 19 db at 1000 cycles
from 600 -ohm source to 600 -ohm load) it should
not be used unless the line level is between -5 and
+20 dbm.
b. 6-db Pad. When the program output of the
consolette is to be connected to a long telephone
nections.
d. Line Equalizers. The Type BE -1 series of
Variable Line Equalizers, and the Type 56-E Dual
Line Equalizer are recommended for connections be-
tween the remote lines, and the remote -line input
terminals of the consolette. They are designed to
equalize unloaded telephone lines up to 10 miles
long. The Type 56-E provides equalization up to
10,000 cycles, and the Type BE -1 series, up to 15,000 cycles.
4
e. Cabinet Rack or Wall Box. The telephone
pad, line jacks and line equalizer may be mounted
in an MI -11500 Wall Box. This box has space for
four Type 33-A or six Type 33-B Jack Panels, and
one type 56-E equalizer. If more space is required,
the BR -84 Cabinet Rack may be used instead of
the wall box.
100 n-
100 -0.
400-m-
Tubes
Tubes are not supplied with the consolette. For
regular use, the MI -11268 Tube Kit, which contains
one complete set of tubes for the consolette and the
power supply should be ordered. For emergency use,
the MI -11268-A Tube Kit should be ordered. The
components of these kits are listed under Technical
TO 600n
TO 600 -ATEL. LINE
LINE OUT
OF CONSOLETTE
Data.
400 21-
Wall and Floor Outlets
Wall and floor outlets for microphones, signal
lights, loudspeakers, and turntables are listed in
100 n
I00 -10610,141
figures 4 and 5.
Conduit Terminating Box
A conduit terminating box is required for the
installation. This box may be constructed by the
installing electrician as shown in figure 6.
Multiple -Channel Switching Systems
The BCS-2A Switching Console, MI -11622, may
be used to switch the outputs of two consolettes to
any two outgoing channels. The BCS-1A Switch -
Figure 3 - 6-db Pad for Telephone Line
ing System which consists of the MI -11625 Master
Console, and the MI -11625-A Studio Console, may
be used to switch any of five consolettes to any of
three outgoing channels. These switching systems
will be particularly useful at stations having both
f -m and a -m transmitters.
5
TYPE 76-C CONSOLETTE
PART II
Installation
The details of the installation will vary with
GENERAL
individual requirements. The following procedure
is suggested: Install the consolette, power supply,
announce microphone, and monitor loudspeaker in
the control room. Place the consolette on a level
surface as shown in figure 6, and mount the power
supply on the wall as instructed in Part IV, the MI 11301 -B Power Supply. Construct a metal box of
the type shown in figure 6 and mount it in the wall
The Type 76-C Consolette is primarily designed
for a "single -studio" installation containing one
large studio, a control room and an announce booth.
A typical installation of this type is shown in figure
4. An alternative layout referred to
as
a "two -
studio" installation is shown in figure
5.
As
shipped, the consolette is wired for single -studio
operation. If a two -studio installation is to be used,
the connections must be changed on a terminal
board containing 20 terminals (TB -39) which is
on the bottom of the relay mounting plate. These
or floor near the consolette. Run four I1/4 -inch flex-
ible conduits from the box to the holes in the back
or the bottom of the consolette. Terminate the conduits from all associated equipment at the box.
connections are shown in figure 8.
(AI MI -4624 WALL RECEPTACLES
IN STANDARD OUTLET BOXES.
(B) STANDARD FLUSH -MOUNTING
OUTLET BOX WITH COVER
234
--
ANNOUNCE AND
TRANSCRIPTION BOOTH
POWER LINE WALL
SWITCH B FUSE BOX
,MI -11703:
Rki.4y r
IIKSPKR
3.
TEL. LINES WALL
TERMINAL BOX
OLNAtI,F:
BR -84 RACK
(C) STANDARD EXTENSION FLOOR
'
6 DB PAD
TT -11
BOX WITH TELEPHONE OUTLET.
..,
(D) STANDARD EXTENSION FLOOR
BOX WITH LIGHTING OUTLET.
MOUNT IN
RACK
.2
OR
MI -11500
WALL BOX
FOR
INE
ACKS
AND
EQUALIZERS
STUDIO
vw.dvvv,
7-1TWcti
'ON AIR'. LAMP
'AUDITION LAMP
F
4
tRIE-ILigii
-.19
9
CUE SPEAKERMIC
TO TEL. CO
40
31
32
I or N..r..C1
13
WC. 2 Or \/41
33
10
37_,..113 STATION
14
MIC 3 Or \
MIC. 4
MI -11301-6r
----- -----------
TO OFFICE
SPEAKERS
41
H
TO TRANSMITTER IF
IN SAME LOCATION
POWER
Orr \_,'N.4 SUPPLY
43
MIC. 5
MIC. 6
GROUND
\C±,
42
-
12
CONDUIT TERMINATING BOX
IN WALL OR FLOOR
111
24
an
215
26
27
-- iT
41 26
30
Oj
j
CONSOLETTE
39
NOTE, DOTTED LINES INDICATE
OPTIONAL EQUIPMENT.
I
EXTRA MIC., WHEN ANNOUNCE
BOOTH NOT INSTALLED
CONTROL ROOM
TALK BACK
MICROPHONE
'SPEAKER
TT -
0
,14;
0
'ON AIR' LAMP
ANNOUNCE
MICROPHONE
Figure 4 - Typical Conduit Layout for Single -Studio Installation
T-169522
6
ANNOUNCE AND
TRANSCRIPTI ON
POWER LINE WALL
SWITCH (FUSE BOX
TO P
6,413PIAR
2341
J
LAMP
LINES WALL,_....ro
TE'RRMINAL
BOXY
AFA-AY
BRS4 RACK
OR
1
s OB PAD
1
STUDIO A
MOUNT IN
RACK.
.8
1
11
'ON AIFELAMP
M*11500
WALL BOX
FOR
STUDIO
LINE
AND
1.1,Lr_1114-8-1
-33
AUDITIOWLAMP
CUE SPEAKER- -
CUE SPEAKER
C1
4T
38
3
12
A,
SIC.2
'ON AIR' LAMP
-..1;21)
)LIDITO(LAMP
MICA atrC
TO OFFICE...40..
31
SPEAKERS
IB
TB
mic
pB
MIC.
TOeicrt;ig)N
CONTRCI:ROON
SPEAKER
O
-1-F TO TRANSMITTER Ir
IN SAME LOCATION
(A)MI-4824 WALL RECEPTACLES IN
STANDARD OUTLET BOXES.
CONDUIT TERMINATING BOX
IN WALL OR FLOOR
(2) STANDARD FLUSH -MOUNTING
OUTLET BOX WITH COVER.
N.
21
(C) STANDARD EX TENSION FLOOR BOX
WITH TELEPHONE OUTLET.
(D)STANDARD EXTENSION FLOOR
BOX WITH LIGHTING OUTLET.
IC 5
rnr
MIC
26
28
IT
I
LTJ
CONSOLETTE
TALK BACK
MICROFICHE
3
3ti
-146
POWER
(SUPPLY
B
LECILIALIZER
CCROUIT MAY It
IMOUGMT 1/4 REAR
OR 007701A Of
0 O
NOTE: DOTTED LINES INDICATE
OPTIONAL EQUIPMENT.
*
CONSOULT TC - MEE
IIGISK
T-2(-180
ON AIR -LAMP
EXTRA MIC. WHEN ANNOUNCE BOOTH IS NOT INSTALLED.
ANNOUNCE
MICROPHONE
Figure 5 - Typical Conduit Layout for Two -Studio Installation
CONDUIT BOX TO BE ORDERED WITH ONEPIECE DETACHABLE COVER PLATE.
SPACE 7' OR
MORE FOR
BABAS CHASSIS
CUT AS SHOWN AND DRILL FOUR HOLES
CONSOLETTE
DIAM.
WINDOW
00'0
of
CONDUIT BOX MAY
ha
BE SET IN WALL
OR FLOOR AS SHOWN.
0
NOTE: CONDUITS MAY
CONNECT TO BACK OF
CONSOLETTE IF MORE
CONDUIT
BOX
CONVENIENT.
.9]
OPTIONAL METHOD
0
u.4
0
0
TOP VIEW
OF INSTALLATION
by
MI
WALL
i.
0 0 0 0 0_
FLOOR
Jr
z
X/ /1"/"/://./
SIDE VIEW
/7/7/ii77-.e.Z7171717/7/777t
- CONDUIT
A STEEL CABINET
SIZE 12 X 18 X 6 IS RECOMMENDED IF
WALL THICKNESS IS AVAILABLE.
(12 X 18 X 4 CABINET MAY BE USED.)
Figure 6-installation Diagram
N17474I
7
REAR VIEW
END VIEW
Iii5" DIAM.
8 HOLES
10
r
-ai-
7
__
1
11 re
I "
17a
1
-
1.
2
.
-4:
2
11
I
- - - -a
I-
13.,
1916
39
TERMINAL BOARDS
17
;
BOTTOM VIEW
P-174740
Figure 7 - Mounting Dimensions
CONNECTIONS
Two conduit lists are supplied to supplement figures
4
and
5.
Conduit List A provides the
essential connection information for single -studio
installations, and Conduit List B for two -studio installations. Although it is not necessary to follow
these lists in all details, the following instructions
should be observed:
a. Do not place a -c power leads and audio leads
in the same conduit.
b. Do not place low- and high-level leads in the
same conduit.
c. In a two -studio installation, install microphones 1 and 2 in studio A, and microphones 3, 4,
5, and 6, in studio B.
To reach the terminal boards, grasp the two
handles on the front panel of the consolette, and
swing the cabinet back. As seen from the front,
two audio terminal boards are mounted on the
right-hand side of the base board. The terminal
boards for relay, loudspeaker, and power connections are mounted on the left.
Pull the leads through the conduits and connect
them to the terminal boards as directed in the appropriate conduit list.
IMPORTANT: Do not cut shielded leads at the
conduit terminating box.
Audio Input Connections
As the consolette is shipped, each of the input
transformers is wired for operation from a 250 -ohm
source. If it is desired to connect a microphone
having a 30 -ohm output impedance to any of inputs
1 to 4 inclusive, change the connections to the input
TERMINAL CONNECTIONS FOR TWO-STUDIO OPERATION
CD CD CD CD
CD CD
CD CI CD 8 CD S
CD CD 0 0 ® ® 0
TERMINAL CONNECTIONS FOR SINGLE-STUDIO OPERATION
CD CD CD
CD CD
CD
CD CD 0 8
CD 0 0 CD 0 C) CD
CD
CD91
NOTE: THE TERMINALS ARE ON A 20-TERMINAL BOARD
BELOW THE RELAY MOUNTING PLATE.
K-13072379
Figure 8 - Connections for One or Two Studios
8
transformer corresponding to the desired input
(T-1, -2, -3, or 4) as follows:
a. Unsolder the wire from transformer terminal number 1 and solder it to transformer terminal number 2.
b. Unsolder the wire from transformer terminal number 6 and solder it to transformer terminal number 5.
All microphones must be phased properly. If
the studio microphones are all of the same type,
connect them as follows: Connect microphone 1
to terminals 1 and 2 of the consolette; then connect
the other microphones so that the microphone leads
that are ultimately connected to terminals 3, 5, 7,
13, and 15 are of the same color as the microphone
lead connected to terminal 1. If the microphones
are not all of the same type, phase them as directed
in the microphone instruction books.
The consolette is connected so that the controlroom announce microphone also serves as a talk -back
microphone. If it is desired to use a separate microphone for talk -back, remove the jumpers between
terminals 59 and 63, and 60 and 64, and connect the
talk -back microphone to terminals 59 and 60.
When the remote -line inputs are to be used, two
line or bridging transformers must be connected
between the remote lines and mixers 5 and 6. (See
Equipment for Use with Telephone Lines under Associated Equipment.) Since all the transformer connections are made to terminals in the consolette, the
transformers may be installed in the consolette
IA)
TB -2
I
STUDIO - AND I CONTROL -ROOM SPEAKER.
T -I5
o3
o.
113)
STUDIO-, I CONTROL -ROOM- AND I ANNOUNCE -BOOTH SPEAKER
OR 2 STUDIO SPEAKERS AND I CONTROL -ROOM SPEAKER.
I
TB -2
T -I5
1C1
2 STUDIO-, I CONTROL -ROOM-,
AND I ANNOUNCE -BOOTH
SPEAKER.
01
TB - 2
T -I5
63
04
P174/39
Figure 10 - Loudspeaker Connections
cabinet. It is suggested that the transformers be
mounted on the base of the consolette near the terminal boards. Two L-shaped mounting brackets,
which may be constructed as shown in figure 9
are required.
To connect the transformers, proceed as follows:
a. Unsolder the jumpers that are between the
following terminals:
209 and 213
210 and 214
211 and 215
212 and 216
b. Connect the primary of one transformer
across terminals 209 and 210, and the secondary
across terminals 213 and 214.
c. Connect the primary of the second transformer across terminals 211 and 212, and the secondary across terminals 215 and 216.
d. Ground the shields of both transformers.
When balanced lines are to be used, ground the
primary center -taps of both transformers.
Audio Output Connections
The LINE OUT terminals, 145 and 146 should
be connected to a 500- to 600 -ohm telephone line.
If the telephone line is long, connect a 6-db pad
between these terminals and the line. (See Equipment for Use with Telephone Line under Associated
Equipment.)
Loudspeaker Connections
Figure 9 - Mounting Bracket for Line Transformers
The loudspeaker terminals, 129 to 136 inclusive,
9
on TB -41, are connected to an auxiliary board containing four terminals, TB -2, on the bottom of the
relay mounting plate (see fig. 2). As the consolette
is shipped, TB -2 is wired for operation of the control -room speaker and one studio speaker. If a third
speaker, for an announce booth or an additional
ure 11. The impedance across terminals 203 and
204 is 10,000 ohms. For set-ups which do not include the remote volume control, shunt terminals
203 and 204 with a resistor of the proper value to
present the desired source impedance to the recording amplifier.
studio is to be used, TB -2 must be connected so that
the three loudspeakers will be in parallel, and the
Transcription -Turntable Cueing Amplifier
monitor -amplifier output transformer, T-15, must be
connected for five ohms. If four loudspeakers are
Connections
to be used (as in a two -studio installation containing an announce booth) T-15 must be connected
for 15 ohms and TB -2 must be wired to connect
the four loudspeakers in series -parallel. Make all
necessary changes in the terminal -board and transformer connections as shown in figures 10b and 10c;
then connect the speakers as instructed in the conduit lists.
If field power is required, follow the instructions
under Loudspeaker Field Supply in Part IV, the
MI -11301 Power Supply. The MI -11301-B Power
Supply will furnish power for a maximum of three
1000 -ohm, 10 -watt loudspeaker fields. Obtain power
for additional speakers or speakers having ratings
that differ from those for which the power supply
is designed, from an additional power supply.
Recorder Connections
The consolette is connected so that either of two
transcription turntables can be cued by use of the
monitor amplifier in the consolette; however, terminals are also provided for connections to an external cueing amplifier such as any of the Type BA -3
Series of Program Amplifiers or the Type BA -4 Series
of Monitoring Amplifiers. Use of an external amplifier will free the monitor amplifier for other operations while a transcription turntable is being cued.
Connect the external cueing amplifier to the consolette as follows:
a. Unsolder the jumpers that are between the following pairs of terminals in the consolette:
199 and 203
200 and 204
197 and 201
198 and 202
b. Connect terminal 203 to terminal 201, and terminal 204 to 202.
An external recording amplifier and recorder
c. Connect terminal 199 to the high side of the
may be connected to the external record terminals,
203 and 204. A typical recording set-up using the
MI -11274 Remote Volume Control is shown in fig-
600 -ohm unbalanced input of the amplifier, and con-
nect terminal 200 to the low side. Refer to the instruction book supplied with the amplifier.
r
CONSOLETTE
203
4,700 ft
RECORDER
0
0TYPE BA - 4 C
01
P" -
0
204
I
4,700 n.
L
0 GND.
-0
AMPLIFIER
0
TYPE BA -4C AMPLIFIER
CONNECTED FOR 25011 INPUT
AND 15 n OUTPUT.
MI -11274-A REMOTE
VOLUME CONTROL
Figure /I - Typical Recording Setup
K-8872377
10
AUXILIARY SIGNAL LIGHTS AND RELAYS
Description
Number Required
MI -11702 Relay and Capacitor
Relay mounting box
Studio lights*
MI -11702 Relay and Capacitor
Relay mounting box
Resistor, 180 ohms, 20 watts, RCA stock number 17666
"ON AIR" light*
MI -11702 Relay and Capacitor
MI -11703-A Relay and Capacitor (for speaker)
Relay mounting box
Resistor, 180 ohms, 20 watts, RCA stock number 17666
2 for each studio
1 for each studio
2 for each studio
Installation
Studio
Control -room
Announce -booth
"ON AIR" light*
1
1
1
1
1
1
1
2
1
* See Signal Lights and Relays under Associated Equipment.
Addition of Signal Lights and Relays
"ON AIR" and "AUDITION" signal lights and
relays may be installed in the studio, control room
and announce booth. The relays and lights are not
supplied with the consolette. The required equipment is listed under Auxiliary Signal Lights and
Relays.
a. Studio "ON AIR" and "AUDITION" lights.
To install the lights in each studio, proceed as
follows:
(1) Mount the two relays in a metal box as
shown in figure 12 and install the box near the
studio.
(2) Connect the relays and lights as shown
in figure 13.
b. Control -Room "ON AIR" Light. To install
the control -room signal light proceed as follows:
(1) Mount the relay in a metal box as shown
in figure 12, and install the box near the control
room.
(2) Connect the relay and light as shown in
figure 14. Note that terminal 122 should be con-
nected to 208 if the announce -booth light is to be
installed. (The power -supply connection will then
be made through the announce -booth relay.)
c. Announce -Booth Speaker and Signal Light.
To install the announce -booth speaker and signal
light, proceed as follows:
(1) Change the output transformer connections and the connections on TB -2 as instructed under
Loudspeaker Connections.
WI
MI -11702 RELAYS
AUDITION
CUT
MO U LYING
ON AIR
DIMENSIONS
PCB MI M3.11702
RELAY
24.13kEliF2:,
TALL BOX
L
Mk"
J
CONSOLETTE TERMINAL BOARD
NOTE:
FOR TWO -STUDIO INSTALLATION, USE TERMINALS 123,
124 9 125 FOR STUDIO'Ac AND 126,127 a 128 FOR STUDIO'S:
6-8812368
702 RELAYS MOUNTED INA °XIX! STEEL CABINET.
MI -11102
Figaro
12 - Relay Mounting Diagram
P-170615- I
Figure 13 - Studio Signal -Light C
Bons
11
(2) Mount the two relays in a metal box as
shown in figure 12 and install the box near the announce booth.
(3) Connect the relays and lights to the consolette as shown in figure 15. If the control -room
light is not to be installed, connect terminal 208 to
terminal 118. If the control -room light is to be
installed, connect terminal 208 to 122.
IMPORTANT When either the control -room
or announce -booth signal lights or both are to
be installed, do not connect terminal 18 of the
power supply to terminal 118 of the consolette
as directed in the conduit lists. The power
supply connection for all of the relays will be
made through the control -room and announce -
rMI -11702 RELAY
II5V AC
booth relays.
Consolette Signal Lights
Two signal lights (such as "PRE-SET" and "ON
* TO 18 OF POWER SUPPLY WHEN ANNOUNCE
BOOTH LIGHT IS NOT TO BE INSTALLED.
AIR" lights) may be installed on the front panel
of the consolette. When the consolette is installed
TO 208 OF CONSOLETTE WHEN ANNOUNCE
BOOTH LIGHT IS ALSO TO BE INSTALLED.
at a large station, these lights may be operated from
the master control room.
Wiring and two holes covered by plug buttons
(one on each side of the meter) are provided for
the lamp sockets. If the lights are to be operated
K- 8872371
Figure 14-Control-Room Signal -Light Connections
from a 6- to 8 -volt source, the MI -11714 Supervisory
Lamp Kit should be ordered. This kit contains two
8 -volt lamps, two lamp sockets, one red and one
green cap. When the lights are to be operated
SPEAKER
15 -OHM
MI -11703
!RELAY
from a 12 -volt source, the components should be
ordered as follows:
(a) 2 lamp sockets, RCA stock no. 26562
(b) 2 lamps, RCA stock no. 21332 (12 volt
rating)
(c) 1 lamp cap, green, RCA stock no. 17931
(d) 1 lamp cap, red, RCA stock no. 17930
Make the external connections to the lamp sockets
TERMINAL 118
through terminals 157, 158, 159, and 160. Obtain
power for the 8 -volt lamps from the filament supply terminals, 101 and 102. Obtain power for the
12 -volt lamps from an external source.
ON CONSOLETTE
* IF CONTROL -ROOM LIGHT
IS ALSO TO BE INSTALLED,
CONNECT TERMINAL 206
TO 122 INSTEAD OF II*
"ON AIR"
LIGHT
TERMINAL 18
OF POWER SUPPLY
M.14T400
Figure IS - Announce -Booth Relay Connection
Tubes
With a large screwdriver or dime, turn the two
slotted spring catches on the top of the cabinet,
through 90 degrees. Lift the lid of the consolette,
and place the tubes in the proper sockets as indicated by the stencilling on the chassis. Place the
grid caps and shields on the tubes. Make certain
that each shield makes a good connection to the
tube shell.
12
CONDUIT LIST A
SINGLE STUDIO INSTALLATION
Con-
duit
No.
(inches)
1*
1/2
2
1/2
3
1/2
4
5*
1/2
6*
7*
8*
1/2
1/2
1/2
1/2
To
From
Power box
Power box
Power box
Power box
Power box
Power box
MI -11702 Relays
MI.11301-B Power Supply
TT -1
17-2
MI -11702 Relay
MI -11702 Relay
MI -11702 Relay
TT -1 (booth)
Studio "On Air" light
Studio "Audition light
**
Wire
1-C
. 1-C
1-C
1-C
1-C
1-C
1-C
1-C
1-B
A -C supply
A -C supply
A -C supply
A -C supply
A -C supply
A -C supply
A -C
A -C
Speaker field
Conduit box
Studio cue speaker
10*..
1/2
Conduit box
Studio light relays
2A
Speaker audio
D -C to relays
11
1/2
Conduit box
Studio microphones
3-A
Microphone
12
1/2
Conduit box
Studio microphones
3A
Microphone
1 -At
13
14
15
1/2
Microphone 2
Microphone 2
Microphone 5
2A
1/2
Microphone 1
Microphone 3
Microphone 4
16
1/2
Microphone 6
17
11/4
Microphone 5
Conduit box
Microphone
Microphone
Microphone
Microphone
Microphone
Microphone
1-C
1/2
MI -11301-B
1-A
1A
1 -At
1-A
1B
Power supply
4-B
18
11/4
Conduit box
MI -11301-B
Power supply
1-B
4-B
19*....
1/2
Conduit box
20*....
1/2
21*
1/2
TT -1 (booth)
TT -1 (booth)
Conduit box
Conduit box
22*....
23
1/2
1
.
A -C
21 and 22A -C to TT -1
A -C to TT -2
A -C
A -C
A -C
A -C
Series conn.: 19 to
studio speaker (through
cond.
speaker
1/2
9
***
Terminals
Circuit
.Announce booth relay
1-B
2-A
.TT -2 (booth)
. TT -2 (booth)
1-C
1-A
1-B
. Office speakers
'TT -1 Audio (control -room) ..1-A
17),
studio
to control room speaker (through
cond. 41)
. .133 and 134
124 and 125
"On Air"
123 and 124
"Audition"
1 and 2, 3 and 4,
5 and 6
7 and 8, 13 and 14,
15 and 16
11 and 12t
Speaker fields .... 19 and 20
1 to 101
2 to 102
7 to 107
8 to 108
Filament supply
9 to 109
10 to 110
11 to 111
12 to 112
13 to 113
{17
to 117
Relay
18 to 118
15 to 115
16 to 116
4 to 104
Plate supply .... 5 to 105
6 to 106
3 to 103
14 to 114
135 and 136
Audio
D -C to relays
207 and 208
A -C
A -C
Audio
Audio
Audio
Aud. term. of TT
135 and 136
17 and 18
13
CONDUIT LIST A (Coned)
Con-
duit
Diam.
(inches)
No.
24
11/4
**
To
From
Conduit box
Consolette
Wire
***
Terminals
Circuit
Include in conduits 24 and 25 all wires from filaments,
plates, d -c to relays, audio to speakers, and station ground.
25
26
11/4
1V4
Consolette
Consolette
27
11/4
Consolette
28
1/2
29*...
1/2
30
1/2
31*....
32*....
33
34*
1/2
1/2
11/4
...
35*
36*..
1/2
Conduit box
Conduit box
Conduit box
. TT -2 Audio (control -room) ..1-A
Line out
1-A
Control -room announce
-1-A
microphone
. Announce booth microphone 1-A
Announce booth TT -2
2-A
Conduit box
Conduit box
Conduit box
Conduit box
Conduit box
Microphone
Audio
11 and 12
17 and 18
19 and 20
67 and 68
69 and 70
71 and 72
73 and 74
183 and 184
185 and 186
187 and 188
189 and 190
191 and 192
145 and 146
4-A
Remote
Cue lines
5-A
Cue
Line out
MI -11703 Booth relay
MI -11702 Booth
relay
Announce booth MI -11703 Relay
1/2
speaker
Announce booth
37*
1/2
38*....
1/2
1/2
MI -11702 relay
1/2
Power box
41
19 and 20
145 and 146
Remote lines
1/2
1/2
Audio
Audio
Microphone
9 and 10
Conduit box
"On Air" lamp
Conduit box
Conduit box
39*
40*
Include in conduits 26 and 27 all wires from microphones,
turntables, remote lines, cue lines, and line out.
Audio
D -C to relay
1-B
Audio
MI -11702 Relay
Station ground
.
.
Conduit box
1-A
.1-A
.
A -C terminals of lamp
A -C
1-C
MI -11702 Relay (control1-A
room)
"On Air" lamp (control -room 1-C
MI -11702 Relay
D -C terminals
Ground
D -C to relay
103
.
121 and 122
AC
A -C terminals of lamp
I -C
A -C supply
AC
1-B
Speaker field .....Series conn:
20 to control - room
speaker (through cond.
17); control -room
. Control -room speaker
speaker
to s tudio
speaker through cond.
42t
1/2
Microphone 4
43
v2
Talk -back
Microphone
Extra studio microphone
Conduit box
1-B
1-A
1-A
Speaker autio
Microphone
Microphone
*** Numbers in bold face type refer to MI -11301-B Power Supply terminals.
* Conduits for optional equipment or optional locations.
t For extra studio microphone, when announce booth is not installed.
** The type of wire in the conduits is indicated as follows:
A. MI -64 (No. 20 AWG stranded 500 v shielded, twisted pair).
B. MI -65 (No. 16 AWG.600 v shielded, twisted pair).
C. No. 14 lead covered pair.
9)
129 and 130
11 and 12
59 and 60
14
CONDUIT LIST B
TWO -STUDIO INSTALLATION
Con-
duit
No.
Diam.
(inches)
1*..
1/2
2
1/2
3
4
1/2
1/2
5*....1/2
6*....
1/2
7*..
1/2
8*....1/2
9*..
1/2
Power box
Power box
Power box
Power box
Power box
Power box
Power box
Studio A light
relay
Studio A light
Studio A light relays
MI -11301-B Power Supply
TT -1
TT -2
Studio B light relays
Announce booth light relay
TT -1 (booth)
Studio A "On Air" light
Studio A "Audition" light
relay
sus
**
Wire
To
From
Circuit
1-C
1-C
1-C
1-C
1-C
1-C
1-C
1-C
A -C supply
A -C supply
A -C supply
A -C supply
A -C supply
A -C supply
A -C supply
1-C
1-B
A -C
Terminals
A -C
21 and 22
A -C of TT -1
A -C of TT -2
A -C
A -C
A -C of 1T-1
A -C
Speaker field
A -C
A -C
.
Series connection:
19 to
Stud. A field;
(through cond. 14);
10
1/2
Conduit box
Studio A speaker
Stud. A field to Stud.
B field (through cond.
36)
11*
1/2
12
13
1/2
14
11/4
1/2
1-C
Speaker audio
Conduit box
Studio A light relays
2-A
Relay d -c
Conduit box
Microphone 1
Studio A microphones
Microphone 2
2-A
1-A
Microphone
Microphone
MI -11301-B
Conduit box
1-B
Speaker field ..
Power Supply
133 and 134
124 and 125
"On Air"
123 and 124
"Audition"
1 and 2; 3 and 4
19 (see Cond. 10)
120 (see Cond. 37)
1
15
1%
MI -11301-B
Conduit box
4-B
Filament
1-B
Relay d -c
4-B
Plate d -c
1-C
1-B
Ground
Audio
Relay d -c
135 and 136
207 and 208
A -C
A -C
Audio
Audio
Audio
Audio term. of TT
Power Supply
16
1/2
17*....
1/2
Conduit box
Conduit box
Station ground
Announce booth relay
2-A
18*....
1/2
19*.... V2
20*
1/2
21
22
1/2
1V4
TT -1 (booth)
TT -1 (booth)
Conduit box
Conduit box
IT -2 (booth)
TT -2 (booth)
Consolette
Conduit box
Office speakers
TT -1 (control -room)
to 101
2 to 102
7 to 107
8 to 108
9 to 109
10 to 110
12 to 112
13 to 113
17 to 117
18 to 118
15 to 115
16 to 116
4 to 104
5 to 105
6 to 106
11 to 111
3 to 103
14 to 114
1-C
1-A
1-B
1-A
103
135 and 136
17 and 18
Include in conduits 22 and 23 all wires from filaments,
plates, d -c to relays, audio to speakers, and station ground.
15
CONDUIT LIST B (Cont'd)
Con-
Diam.
(inches)
duit
No.
23
11/4
24
11/4
Consolette
Consolette
25
11/4
Consolette
26
27*
28
29*
30*....
31
32*....
**
Wire
To
From
Conduit box
Conduit box
Include in conduits 24 and 25, all wires from microphones,
turntables, remote lines, cue lines and line out.
1/2
Conduit box
Conduit box
Conduit box
Conduit box
Conduit box
TT -2 (control -room)
. Line out
Control -room microphone
Announce booth microphone
1/2
Conduit box
11/4
Conduit box
1/2
1/2
1/2
IA
***
Terminals
Circuit
19 and 20
145 and 146
1-A
Audio
Audio
Microphone
Microphone
Announce booth turntables
2-A
Audio
Remote lines
4-A
Remote audio
Cue lines
5-A
Cue
Line out
MI -11703 booth relay
1-A
Audio
17 and 18
19 and 20
67 and 68
69 and 70
71 and 72
73 and 74
-183 and 184
185 and 186
187 and 188
189 and 190
191 and 192
145 and 146
1-A
Relay d -c
D -C terminals
Conduit box
Studio B light relays
2-A
Relay d -c
Studio B light
Studio B "On Air" light
1-C
A -C
127 and 128
"On Audition"
126 and 127
"On Air"
A -C term. of lamp
Studio' B "Audition" light
1-C
A -C
A -C term. of lamp
1-B
Speaker field
Series
connection be-
tween
studio A and
MI -11702 Booth
1-A
1-A
1-A
9 and 10
11 and 12
relay
33*
1/2
34*
1/2
relay
35*
1/2
Studio B light
relay
36
V2
Conduit box
control room speaker
fields (cond. 10 and
Studio B speaker
37)
1-B
37
1/2
Conduit box
Control -room speaker
(1-B
1-B
Audio
Speaker audio
Speaker field
131 and 132
129 and 130
Series connection:
20 to control -room
speaker field through
cond.
14); control -
room speaker field to
studio B speaker field
38
39
1/2
40
1/2 .
41t
1/2
Conduit box
Studio B microphones
2-A
Microphone
1 -At
Conduit box
Studio B microphones
2-A
Microphone
Microphone
Microphone 3
Microphone 4
Microphone 4
Extra Studio B microphone
1-A, 1 -At Microphone
1-A
Microphone
(through cond. 36)
5 and 6
7 and 8
11 and 12
13 and 14
15 and 16
16
CONDUIT LIST B (Cont'd)
Con-
duit
No.
Diam.
(inches)
42
1/2
43*
1/2
To
From
Microphone 6
Microphone 5
Announce booth .MI -11703 relay
**
Wire
***
Terminals
Circuit
1-B
Microphone
Audio
1-C
A -C
A -C term. of lamp
1-A
Relay d -c
121 and 122
1-C
A -C
A -C term. of lamp
1-C
A -C supply
A -C
1-A
Microphone
59 and 60
1-A
speaker
44*
1/2
45*
I/2
46*
1/2
47*
1/2
Announce booth MI -11702 relay
"On Air" lamp
Control -room relay
Conduit box
Control -room "On Air" lamp
Control -room
light relay
Control -room light relay
Power box
48
I/2
Talk -back micro-
Conduit
phone
Box
*** Numbers in bold face type refer to MI -11301-B Power Supply terminals.
* Conduits for optional equipment or optional locations.
t For extra studio microphone, when announce booth is not installed.
**'The type of wire in the conduits is indicated as follows:
A. MI -64 (No. 20 AWG stranded 500 v shielded, twisted pair).
B. MI -65 (No. 16 AWG 600 v shielded, twisted pair).
C. No. 14 lead covered pair.
17
TYPE 76-C CONSOLETTE
PART III
Operation
GENERAL
The block diagram, figure 16, shows the amplifiers, controls, and switches of the consolette. Many
of the switches are interlocked in groups so that
only one of each group may be operated at a time.
The mechanically interlocked groups are indicated
by dotted lines. Electrical interlocking is shown by
the connections between the switches. Figure 17
shows all controls and stenciled designations as they
appear on the front panel. Symbols corresponding
to those on the block diagram have been added to
this figure for rapid identification.
In a group at the bottom and center of the front
panel are six volume controls. Each volume control
is associated with the mixer that is indicated by
the number above the control. Mixers I, 2, and 3
are permanently connected to microphone inputs
1, 2, and 3 respectively, through their associated
preamplifiers. A switch (ANNOUNCE switch,
K-7) in the input of preamplifier 4, may be used
to connect the control -room microphone, the fourth
studio microphone, or an additional microphone in
the studio or announce booth to the fourth mixer.
Two groups of pushbuttons in the upper righthand corner of the panel (MIXER 5 INPUT and
MIXER 6 INPUT) are used to select the inputs to
mixers 5 and 6. The input of each of these mixers
may be either a remote line, a transcription turntable or an extra studio microphone. The pushbuttons are mechanically and electrically interlocked
so that only one input may be connected to each
mixer at a time, and the same input may not be
simultaneously connected to both mixers.
channel consists of a pushbutton labeled AUD ( in
the MONITOR INPUT group, PK-4), the monitor
amplifier and the monitor loudspeakers. The MASTER and MONITOR volume controls regulate the
volume of the program and the monitor amplifiers
respectively. When the LINE-OUT switch is in the
REG position, the program amplifier is connected
to the outgoing line. When the LINE-OUT switch
is in the EMERGENCY position, the monitor amplifier is connected to the outgoing line. The
EMERGENCY position is to be used only when
the program amplifier is defective.
Two groups of pushbuttons in the left-hand
corner of the consolette, (PK-3 and PK-4) are used
for subsidiary functions such as studio cueing, remote cueing, transcription -turntable cueing, talk back, remote intercommunication and monitoring.
The use of these pushbuttons, the PH-MON switch,
and the OVERRIDE switch is explained under
Operating Procedure and in the Switch Operation
Table.
Separate rectifiers for the program and the mon-
itor amplifiers are provided in the MI -11301-B
Power Supply. If the program amplifier rectifier
should become defective, a switch on the power
supply may be operated to obtain plate and screen
voltages for the preamplifiers from the monitor
amplifier rectifier. The operation of this switch is
explained in section IV, The M/ -11301-B Power
Supply.
An interlocking relay system is used to prevent
By use of the A -P switches (K-1 to K-6) directly
above the mixer volume controls, each of the mixers
may be connected either to the program or the audi-
acoustic feedback from studio loudspeakers to near-
tion channel. The program channel consists of a
the light relays are accessories. (See Signal Lights
and Relays under Installation.) A description of
the relay system is given under Relay Operation.
four -stage
program
amplifier,
the
LINE-OUT
switch K-8, and the outgoing line. The audition
by microphones, and to operate the signal lights.
The speaker relays are part of the consolette, but
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19
SWITCH OPERATION TABLE
Key Switches
Switch
General Function
Exact Function
Broadcasting: See LINE-OUT switch, K-8
K-1 to K-6 connect mixers 1 to
6 respectively to input of program amplifier
Position
A -P (Audition -Program) P (Program)
switches, K-1 to K-6
Center
K-1 to K-6 disconnect and terminate mixers 1 to 6 respectively
A (Audition)
Auditioning: See AUD pushbutton of
K -I to K-6 connect mixers 1 to
MONITOR INPUT group, PK-4
6 respectively to AUD pushbutton of PK-4
ANNOUNCE switch,
REMOTE
Announcing from remote microphone in
announce or transcription booth. See K-1
to K-6 and LINE-OUT switch, K-8
Connects remote microphone to
mixer 4 through preamplifier 4
Center
Broadcasting or auditioning with Studio
mic. 4. See K-1 to K-6 and LINE-OUT
Connects studio mic. 4 to mixer
K-7
4 through preamplifier 4
switch, K-8
LOCAL
Announcing from control room. See K-1
to K-6 and LINE-OUT switch, K-8
Connects control -room micro -
phone to mixer 4 through preamplifier 4
LINE OUT switch, K-8
REG
Regular use of program amplifier for
broadcasting
Connects program amplifier to
outgoing line
Terminates program amplifier
Center
in resistive load
EMG
OVERRIDE -RECORD
switch K-9
OVERRIDE
Emergency use of monitor amplifier for
Connects monitor amplifier to
broadcasting
outgoing line
Monitoring any remote lines that are not
in use as inputs
Connects remote lines that are
not in use to monitor amplifier
input
RECORD
Recording (with external amplifier and
recorder)
PH-MON switch K-10
Connects output of monitor am plifier to external record terminals No. 203 and 204
output of program
amplifier to phone jack
PROGRAM
Monitoring
phones
Center
a. Network monitoring
a.
Connects monitoring terminals 147, 148 to phone jack
b. Remote cueing. See PK-3 REMOTE
b.
Connects output of monitor
amplifier to REMOTE CUE
buttons of PK-3
program
through
head-
CUE buttons
REMOTE
Remote talk -back. See PK-3 Remote Cue
and REM TB buttons
Connects
Connects output of monitor
amplifier to REMOTE CUE buttons of PK-3 when control -
room microphone is in use
20
SWITCH OPERATION TABLE (Cont'd)
Pushbuttons
Pushbutton Group
MIXER 5 INPUT, PK-1
Pushbutton
Designation
1, 2, 3, and 4
General Function
Exact Function
Broadcasting or auditioning from remote-
Connect remote line correspond -
line input. See K-1 to K-6 and LINEOUT switch K-8
ing to button pressed to input
of mixer 5, when OFF button
is pressed
MIC 5
Broadcasting or auditioning with microphone 5. See K-1 to K-6 and LINE-
Connects mic. 5 to mixer 5
through preamplifier 5 when
OUT switch K-8
OFF button is in normal (out)
position
TT -1, TT -2
OFF
MIXER 6 INPUT, PK-2
1, 2, 3, 4
MIC 6
Broadcasting or auditioning with transcription turntable input. See K-1 to K-6
Connects
and LINE-OUT switch
pressed, to mixer
Broadcasting or auditioning using remote line inputs. See pushbuttons 1, 2,
3, and 4 of PK-1
Connects remote -line buttons to
Same as corresponding buttons of PK-1
Same as corresponding buttons
of PK-1 except for the follow ing: mixer 6 is used instead of
mixer 5; microphone 6 is used
instead of microphone 5
TT -1, TT -2
REMOTE CUE and 'IT-
REMOTE CUE
a.
Sending cues over remote lines
CUE
transcription
turn-
table corresponding to button
5
through
preamp. 5 when OFF button is
in normal (out) position
input of mixer 5 and disconnects MIC 5 and TT buttons
a.
Connects output of monitor
amplifier through PH-MON
switch (center or program
position) to remote line
corresponding to button
pressed
b. Remote
intercommunication.
See
K-10, PH-MON switch, REM TB buttons of PK-3
output of mon.
amplifier through PH-MON
switch (REMOTE position)
b. Connects
to remote line, when REM
TB buttons are pressed
MIX 5 TT -CUE
MIX 6 TT -CUE
Transcription turntable cueing. See PK1, 2, TT buttons
Connects input of mixer cot responding to button pressed, to
input of monitor amplifier, or
to external cueing amplifier
REM TB
Remote talkback. See REMOTE CUE
buttons, PK-3
Connects control -room micro -
phone to input of monitor amplifier. Connects output of monitor amplifier through K-10
(REMOTE position) to REMOTE CUE buttons
OFF
Disconnects all buttons of PK-3
except REM TB buttons, by
mechanical interlocking
21
SWITCH OPERATION TABLE (Cont'd)
Pushbuttons
Pushbutton Group
Pushbutton
Designation
MONITOR INPUT, CUE 1,
PK-4
2,
3, 4,
5
M (Monitor)
General Function
Exact Function
Cueing the studio from cue telephone
Connects cue line corresponding to button pressed to input
of monitor amplifier
lines
a.
Program monitoring through controlroom speaker
output of program
amplifier to input of monitor
Connects
amplifier
b.
AUD
Remote cueing. See PK-3 REMOTE
CUE buttons
Auditioning. See K-1 to K-6
Connects mixers corresponding
to any of switches K-1 to K-6
that are in the A position, to
the monitor amplifier input
TB -A, TB -B
Talk -back from control room to studio
Connect
control -room
micro-
phone to monitor amplifier input. Turn desired studio speaker
on, and other studio speaker
off
NOTE: The following switches are electrically interlocked; only one of each group should be used at a time.
a. K-7 (LOCAL position), TB -B, TB -A of PK-4, REM TB, MIX 5, 6 TT -CUE of PK-3.
b. All buttons of PK-4.
Remote -cue buttons of PK-3 with corresponding remote -line buttons of PK-1 and PK-2.
c.
d. Buttons of PK-1 with corresponding buttons of PK-2.
The following switches are mechanically interlocked; only one of each group can be used at a time.
a. Remote line buttons of PK-1.
b. MIC 5, TT -1, -2 buttons of PK-1.
c. Remote line buttons of PK-2.
d. MIC 6, TT -1, -2 buttons of PK-2.
e. All buttons of PK-3 except REM TB.
Relay Operation
The consolette contains three relays for the control -room, studio A and studio B speakers. The
three speakers are normally connected to the monitor amplifier through their relay contacts. The
speaker relays and any auxiliary light relays that
have been installed as directed under Installation
will be operated by the controls of the consolette
as indicated in figures 18 and 19, Speaker Relay
Operation Tables A and B, and Light Relay Opera-
tion Tables A and B. When a microphone is on
the air or on audition, the speaker that is installed
in the same room as the microphone will be disconnected by the speaker relays. The "ON AIR"
and "AUDITION" lights of any one studio can not
be on simultaneously. No combination of switch
settings will energize more than three relays simultaneously.
If the relay power should be cut off, the studio
speakers will be off, and the control -room speaker
will be on because the studio -speaker relays are normally energized and the control -room speaker relay
de -energized. All signal -lights are normally off and
all light relays (except the announce -booth relay)
are normally de -energized. When a control -room
"ON AIR" light is used, the light will be on only
when the speaker is off. The announce -booth light
will also be on only when the announce -booth
speaker is off.
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23
SPEAKER RELAY OPERATION TABLE A -SINGLE -STUDIO OPERATION
Studio
Speaker
Control
Room
Speaker
Switches normal
on
on
K-1 and/or K-2, K-3 to P or A
b. K-4 to P or A, K-7 center
c. K-5 and/or K-6 to P or A, MIC 5 and MIC 6 buttons
off
off
on
on
on
on
Switching
Function
Studio in use
a.
normal
d. Same as "a," and/or "b," TB -A pressed
K-5 to P or A and MIC 5 button pressed
K-6 to P or A and MIC 6 button pressed
on
off
off
off
off
K-7 center, K-8 to REG
h. Same as "g" and TB -A pressed
on
on
on
off
off
K-7 to LOCAL, K-4 to P, A, or center
b. K-7 to REMOTE, K-4 to P, A, or center
on
on
off
Remote TB buttons pressed
K-8 to EMG position
off
off
off
on
e.
f.
g.
Announcing
Remote talk -back
Emergency
K-1 and/or K-2, K-3 to P, K-8 to REG; K-4 to P,
a.
on
NOTE: Speaker relays are controlled by the following switches:
Studio Speaker: K-1, K-2. K-3. K-4, K-5 and MIC 5 button; K-6 and MIC 6 button; K-7, K-8, TB and REMOTE
TB buttons.
Control -room speaker: K-7 and K-4.
SPEAKER RELAY OPERATION TABLE B
Function
TWO -STUDIO OPERATION
Switching
Switches normal
Studio A in use
Studio B in use
Announcing
Remote talk -back
Emergency
K-1 and/or K-2 to P or A
Studio A
Studio B
Speaker
Speaker
Control
Room
Speaker
on
on
on
off
on
on
b. Same as "a" and TB -A pressed
c. K-1 and/or K-2 to P and K-8 to REG
d. Same as "c" and TB -A pressed
on
off
off
off
off
on
on
off
off
a. K-3 to P or A
b. K-4 to P or A, K-7 center
c. K-5 and/or K-6 to P or A, MIC 5 and MIC 6
buttons normal
d. K-5 to P or A and MIC 5 button pressed
e. K-6 to P or A and MIC 6 button pressed
f. Same as "a" and/or "b" and TB -A pressed
g. K-3 to P, K-8 to REG, K-4 to P, K-7 center,
K-8 to REG
h. Same as "g" and TB -B pressed
a. K-7 to LOCAL, K-4 to P, A, or center
b. K-7 to REMOTE, K-4 to P, A, or center
Remote TB buttons pressed
on
on
on
off
off
on
on
on
on
on
on
off
off
on
on
off
on
off
on
off
on
off
off
off
on
on
on
on
off
off
off
off
off
off
on
a.
K-8 to EMG
NOTE: Speaker relays are controlled by the following switches:
Studio A speaker: K-1, K-2, K-8, TB and REMOTE TB buttons.
Studio B speaker: K-3, K-4, K-8, TB and REMOTE TB buttons.
Control -room speaker: K-7, TB and REMOTE TB buttons.
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LIGHT RELAY OPERATION TABLE A- SINGLE -STUDIO OPERATION
"On Air"
"Audition"
Switches normal
off
off
K-1 and/or K-2, K-3 to P and K-8 to REG
K-4 to P, K-7 normal, K-8 to REG
c. K-5 and/or K-6 to P or A, MIC 5 and MIC 6 buttons
normal, K-8 to REG
d. K-5 to P, MIC 5 button pressed, K-8 to REG
e. K-6 to P, MIC 6 button pressed, K-8 to REG
f. K -I and/or K-2, K-5 to A and AUD button pressed
g. K-4 to A, K-7 center, AUD button pressed
h. K-5 to A, MIC 5 button pressed, AUD button pressed
i. K-6 to A, MIC 6 button pressed, AUD button pressed
j. Same as "f," "g," "h," "i" and TB -A button pressed
a. K-7 to LOCAL or REMOTE, K-4 to P, K-8 to REG
b. K-7 to LOCAL. or REMOTE, K-4 to A, AUD button
on
on
off
off
off
off
on
on
off
off
off
off
off
off
off
on
on
on
on
off
off
off
off
on
off
Switching
Function
Studio in use
a.
b.
Announcing
off
pressed
K-8 to EMG
Emergency
NOTE: Light relays are controlled by the following switches:
Studio "On Air" relay: K-1, K-2, K-3, K-4; K-5 and MIC 5 button; K-6 and MIC 6 button; K-7 and K-8.
Studio "Audition" relay: K -I, K-2, K-3, K-4; K-5 and MIC 5 button; K-6 and MIC 6 button; K-7 AUD and TB -A
buttons.
LIGHT RELAY OPERATION TABLE B
TWO -STUDIO OPERATION
Studio B
Studio A
Switching
Function
Switches normal
Studio A
in use
Studio B
in use
K-1 and/or K-2 to P and K-8 to REG
K-1 and/or K-2 to A and AUD button pressed
c. Same as "b" and TB -A button pressed
a. K-3 to P, K-8 to REG
b. K-4 to P, K-7 center K-8 to REG
a.
b.
c.
K-5 and/or K-6 to P or A, MIC 5 and MIC 6
buttons normal, K-8 to REG
d. K-5 to P, MIC 5 button pressed, K-8 to REG
e.
K-5 to A, MIC 5 button pressed, AUD button
"On Air"
"Audition"
"On Air"
"Audition"
off
off
off
off
off
off
off
off
off
off
on
off
off
off
on
off
off
off
off
off
off
on
on
off
off
off
off
off
off
off
off
on
off
off
on
off
off
off
off
on
off
off
on
off
pressed
f.
K-6 to P, MIC 6 button pressed, K -S to REG
g. K-6 to A, MIC 6 button pressed, AUD button
pressed
h. K-3 to A, AUD button pressed
Same as "e" and/or "g," "h" TB -B button pressed
off
off
off
off
off
off
off
a.
K-7 to LOCAL or REMOTE, K-4 to P, K-8 to
off
off
off
off
off
off
off
off
on
off
on
off
REG
Announcing
b.
Emergency
on
i.
K-7 to LOCAL or REMOTE, K-4 to A, AUD
button pressed
K-8 to EMG
NOTE: Light relays are controlled by the following switches:
Studio A "On Air" relay: K -I, K-2 and K -S.
Studio A "Audition" relay: K-1, K-2, K-8, AUD and TB -A buttons.
Studio B "On Air" relay: K-3, K-4; K-5 and MIC 5 buttons; K-6 and MIC 6 button; K-7 and K-8.
Studio B "Audition" relay: K-3, K-4; K -S and MIC 5 button; K-6 and MIC 6 button; K-7, AUD and TB -B
buttons.
26
OPERATING PROCEDURE
Operating procedure applicable to both single and two -studio installations is given in the following paragraphs. For information on the exact func-
MIXER INPUT TABLE
Input
Switch
Mixer
tion of each switch, and the interlocking of the
Mic. 1*
None
1
switches, see the switch operation table and the accompanying footnote.
Mic. 2
None
2
Mic. 3
None
3
Mic. 4
K-7 Center
4
Mic. 5
PK-1 OFF button normal,
5
To Put A Program On The Air
To put a program on the air proceed as follows:
a. Switch the desired microphones, transcription turntables or remote lines to the proper mixers
as indicated in the Mixer Input Table.
b.
Place the A -P switch (K-1 to K-6) cor-
responding to these mixers in the P position.
c. Turn the MASTER volume control to position 13 (approx.).
d. Adjust the volume controls of each of the
mixers that are in use one at a time, until the de-.
sired level is indicated by the VU meter. As each
adjustment is made, note the volume control setting corresponding to the desired level; then return
the volume control to the "0" position before
the next adjustment is made. When a signal of
PK-1 MIC 5 button pressed
Mic. 6
Rem. Mic.
K-7 to REMOTE
4
Cont. room
K-7 to LOCAL
4
PK-1 OFF button normal,
5
mic. (announce)
Trans. Turn.
PK-1 TT -1 or TT -2 button
pressed
or
PK-2 OFF button normal,
PK-2, 'MI or TT -2 button
Remote Lines
At the moment that the program is to go
Press the M (monitor) pushbutton of the
MONITOR INPUT group, PK-4. Adjust the
MONITOR volume control until the desired volf.
ume is obtained from the control -room speaker.
Auditioning
To audition a program, proceed as follows:
a. Switch the desired microphones, transcription turntables or remote lines to the proper mixers
as indicated in the Mixer Input Table.
b. Place the A -P switches corresponding to
these mixers in the A position.
c. Press the AUD pushbutton of the MONITOR INPUT group, PK-4.
NOTE: If the remote -microphone input (terminals
11 and 12) is connected to a studio microphone,
this microphone may be used only in conjunction
with one or more of the other studio microphones.
When K-7 is in the REMOTE position, K-4 will not
operate the studio signal -light and speaker relays.
6
pressed
should be approximately position 13.
e.
6
PK-2 MIC 6 button pressed
normal intensity is being picked up, this setting
on the air, place the LINE-OUT switch in the REG.
position; then adjust the mixer volume controls to
the previously determined settings.
PK-2 OFF button normal,
PK-1 OFF button pressed,
PK-1 button corresponding
to desired line pressed
or
PK-2 OFF button pressed,
PK-2 button corresponding
to desired line pressed
5
6
* In a two -studio installation, microphones 1 and 2 are in
studio A, and microphones 3, 4, 5, and 6 are in studio B.
To Cue The Studio From A Cue Line
To cue the studio from any one of the five cue
lines, press the cue button of the MONITOR INPUT group, PK-4 that corresponds to the desired
line.
To Clio Studio A From Studio B
To cue studio A from studio B (or studio B from
A), press the M button of the MONITOR INPUT
group, PK-4.
NOTE: For any operation requiring the use of
loudspeakers, make certain that the desired speakers
are on. (See Relay Operation.)
Program Monitoring
To monitor a program through the control -room
speaker, press the M button of the MONITOR INPUT group, PK-4. To monitor a program through
27
headphones, plug the phones into the phone jack,
and place the PH-MON switch, K-10 in the PRO-
RIDE -RECORD switch in the OVERRIDE positon.
GRAM position.
Recording
Remote Cueing
To send a cue over a remote line proceed as follows:
Place the PH-MON switch in the center or
PROGRAM position.
b. Press the M button of the MONITOR INPUT group, PK-4.
a.
Press the REMOTE CUE button of PK-3
that corresponds to the desired line.
The electrical interlocking of the switches makes
it impossible to cue a remote line that is being used
as an input.
c.
To Talk Back to the Studio
To talk back to the studio, press the button corresponding to the desired studio (TB -A or TB -B)
of the MONITOR INPUT group, PK-4, and speak
into the control -room microphone. For single studio operation, use only the TB -A button.
To record a program that is on the air, press the
M button of PK-4, and place the OVERRIDE -REC-
ORD switch in the RECORD position. To record
a program that is not on the air, operate the controls
as directed under To Audition and place the OVERRIDE -RECORD switch in the RECORD position.
NOTE: An external amplifier and recorder should
be connected to the consolette as directed under
Installation.
Transcription -Turntable Cueing
To permit the transcription -turntable operator to
listen to a record just before it is to go on the air,
proceed as follows:
a. Switch the desired transcription turntable
to either Mixer 5 or 6, as directed in the Mixer
Input Table.
b. Press the TT -CUE button of PK-3 that
corresponds to the mixer to which the transcrip-
tion -turntable is connected.
Emergency Use of the Monitor Amplifier
To Talk Back over the Remote Lines
To talk back over the remote lines, proceed as
follows:
Press the REM TB button of PK-3.
b. Press the CUE button of PK-3 corresponding to the desired line.
c. Place the PH-MON switch in the REMOTE POSITION.
d. Speak into the control -room microphone.
a.
Incoming signals on the remote line may be
If the program amplifier should become defective while a program is on the air, the monitor am-
plifier may be used for broadcasting as follows:
Place thei A -P switches corresponding to the mixers
being us4d, in the A position, press the AUD button, and place the LINE-OUT switch in the EMG
position. If the defect is in the program amplifier
rectifier, also place the REG-EMG switch of the MI 11301 -B Power Supply in the EMG position.
heard through headphones plugged into the phone
Network Monitoring
jack.
If the monitoring terminals 147 and 148 are connected to a network, the network may be monitored
Monitoring the Remote Lines
To monitor a signal on any of the remote lines
that are not being used as inputs, place the OVER -
through headphones plugged into the phone jack,
when the PH-MON switch is in the center position.
T-1
1
T
17
YELLOW
---.BUJE-
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BRN.-I
RED&YEL.
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(90075 5- 502) 25( T- 2550- D
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eth.
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(900491-502) RT- 425- B
R7
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moo()
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THIS SWITCH OPERATED BY CLOSING COVER
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29
TYPE 76-C CONSOLETTE
PART IV
M1 -11301-B Power Supply
TECHNICAL DATA
Power Required
to 130 volts
50 to 60 cycles
225 watts
100
Power Supplied
a. I) -C Plate (with respect to terminal No. 17)
Terminal No.
Volts
4
Fuses
5
6 REG
6 EMG
Transformer T-1, 2 amp
Transformer T-2, 1 amp
Transformer T-3, 1 amp
14
15
16
Tubes
Rectifier 1 RCA-5R4-GY
Ma.
42.
4.6
21.
200
278
210
13.
5.1
1.2
375
62.
b. A -C Heater Supply
Terminals No. 1 and No. 2-6.2 volts at 2.4 amp.
Terminals No. 7 and No. 8-6.2 volts at 0.3 amp.
Terminals No. 9 and No. 10-6.2 volts at 1.6 amp.
Terminals No. 12 and No. 13-6.2 volts at 2.7 amp.
Rectifier 1 RCA -5Y3 GT/G
Dimensions and Weight
Height -15 inches
Width -15 inches
Depth -8 inches
Depth -15% inches (opened)
Weight --60 pounds
285
220
220
c.
Field Supply
Terminals No. 19 and No. 20-100 ma. to one, two
or three, 100 -volt, 10 -watt speaker fields.
d. Relay Supply
Mounting
Terminals No. 17 and No. 18-60 volts at 100 ma.
Wall mounting by the use of two mounting brackets
DESCRIPTION
The MI -11301-B Power Supply furnishes plate,
heater, relay, and loudspeaker field power to broadcast speech -input installations, such as the RCA -76B and 76-C Series of Studio Consolettes. This power
supply operates from a source of 100 to 130 volts, 50
to 60 cycles. It has two full -wave rectifier circuits.
The power supply furnishes the energy for external
relays requiring 60 volts at 100 milliamperes, and
one, two, or three 100 -volt, 10 -watt loudspeaker
fields.
Ventilating screens are provided on the top and
bottom of the cabinet. Knockouts for conduits carrying the wiring to the unit are in the sides of the
cabinet. External connections to the power supply
are made to a terminal board at the left of the
d -c.
sistors, capacitors and transformers are mounted on
the back of a hinged chassis, and are made accessible by swinging the main chassis outward. Opening
the cover opens switch S-2, thereby removing power
from the circuit for safety. A POWER ON -OFF
toggle switch is mounted on the side of the cabinet.
INSTALLATION
Mounting
The power supply is provided with two mounting brackets for use in mounting it on a wall. Refer
to the mounting dimensions diagram, figure 22. The
unit should be near the consolette to reduce wiring,
but not closer than three feet.
Connections
and wiring are accessible for servicing when a
All connections should be made by means of a
flexible cable to the terminal board at the left of
hinged door is swung open to the right. Other re-
the chassis through the knockouts. The screw -type
chassis. Tubes, terminal connections, fuses, resistors
30
terminals are numbered and the corresponding
numbers, together with their power -supply connections are shown in the schematic diagram.
Field Supply
To connect one, two, or three loudspeaker fields
of 1,000 ohms, 10 watts each, such as the 64A and
64B electrodynamic speakers, proceed as follows:
a. Remove the jumper between terminals 19
and 20 on the power -supply terminal board.
b. Connect the field between these same two
terminals.
c.
If two or three fields are used, connect the
fields in series.
d.
Omit one, two, or three 1,000 -ohm sections
of resistor R-1, corresponding to the number of
loudspeaker fields used. This is accomplished by
moving connections of either lead to resistor R-1.
(The 600 -ohm section of R-1 is not to be used.)
R-1 is mounted on the back of the hinged chassis.
Emergency Switch
Figure 21-M1-11301-8 Power Supply
A toggle switch is mounted on a bracket located
in the lower center of the chassis. This switch has
two positions, REGULAR and EMERGENCY.
When the switch is thrown to the EMG position,
the monitor amplifier power supply furnishes the
Figure 22 - Mounting Dimensions, MI.11301-B Power Supply
31
power for the microphone
pre -amplifiers and
booster amplifiers. The monitor amplifier is then
used in place of the program amplifier in the consolette.
Hum Adjustment
If it becomes necessary to make a hum adjustment
on the consolette, the following procedure is recommended: Load the microphone lines (Nos. 1, 2,
3 and 4) with 250 -ohm resistors. Set the master con-
trol and the mixer controls (Nos. 1, 2, 3 and 4
attenuators) for 67 db or normal gain. Connect a
noise meter or an amplifier having approximately
60 db gain to the line-out terminals of the Consolette. Connect a volume indicator meter across the
output of the external amplifier, and adjust hum
potentiometers P-1 and P-2 for the minimum hum.
(The line-out switch must be in the REGULAR
position and the associated mixer switches Nos. 1,
2, 3 and 4 on PROGRAM.)
Figure 23 - Interior View of Power Supply
32
Figure 24 - Rear View of Power Supply Chassis
33
TYPE 76-C CON SOL ETT E
PART V
Maintenance
TUBE CHECK READINGS
Selector
Switch
Setting
tubes. The normal meter reading for each tube is
listed under Tube Check Readings. When these
readings were taken, the line voltage was 115 volts
ac.
Tube
Meter
Reading
1
RCA -1620, preamplifier num-
70 ± 10
2
RCA -1620, preamplifier num-
tetrachloride or crocus cloth every three months.
To clean the volume controls, apply Davenoil to
the contacts and rotate the knobs. If any dark
streaks appear, wipe off the contacts. Repeat this
procedure until the contacts are clean, then apply
a thin film of Davenoil. The Davenoil is shipped
ber 1
3
4
15
6
7
ber 2
RCA -1620, preamplifier number 3
RCA -1620, preamplifier number 4
RCA -1620, preamplifier number 5
RCA -1620, preamplifier number 6
RCA -1620, first stage of pro
gram amplifier
70 ± 10
70 ± 10
70 ± 10
70 ± 10
70 ± 10
70 ± 10
8
RCA -1620, first stage of monitor amplifier
70 ± 10
9
RCA -1620,
70 ± 10
10
11
12
second
stage
of
program amplifier
RCA -1620, third stage of program amplifier
RCA -162I, output stage of
program amplifier
RCA -1621, output stage of
program amplifier
70 ± 10
70 ± 10
70 ± 10
Clean the tube caps and sockets with carbon
with the consolette.
IMPORTANT. The Davenoil is provided for
cleaning the volume -control contacts; no other
cleaning agent should be used.
CARE OF PUSHBUTTON SWITCHES
The pushbutton switches are designed so that a
frequent routine of inspection and cleaning is not
required; however if noisy operation is experienced
as a result of dirty switch contacts, the following
cleaning procedure is recommended:
a.
b.
Open the lid of the cabinet.
With a toothpick, or similar instrument,
put a drop of Davenoil into each of the eyelet
The Type 76-C Consolette is specially designed so
that the components may easily be reached for serv-
holes directly over the switch contacts.
c. Move the plungers in and out several times,
and then remove the excess oil with a pipe cleaner.
icing. The cabinet lid is hinged to permit access
to the tubes and relays. The lid is locked by two
CARE OF KEY SWITCHES
INSPECTION AND CHECKING
slotted spring catches which may be released with a
screwdriver or dime. The cabinet may be swung
back on hinges to expose the terminal boards and
the components beneath the chassis.
To avoid noise caused by corroded contacts or
dirt on terminals and sockets set up a regular inspection routine. To prevent faulty operation,
check the tubes regularly. To test the tubes, turn
the VU control to the OFF position; then rotate the
TUBE CHECK 'switch through positions 1 to 12
and observe the VU meter at each step. The meter
readings will be proportional to the cathode bias
voltages and hence will indicate the emission of the
The key switches have been adjusted so that a
microphone and a loudspeaker in the same studio
may not be "on" simultaneously. If acoustic feedback should occur, adjust the contacts with a standard relay -contact bending tool. Note the following
desired sequence of operation: The relay contacts
must operate first and the audio circuit contacts
last. To adjust the contacts, relieve the tension of
the center spring of the switch contacts that operate the relays, and increase the tension of the center
spring of the contacts in the audio circuits. Do not
alter the spring shape or reduce the pressure excessively so as to cause poor contact or short circuits.
34
TUBE VOLTAGE TABLE
Tube socket voltages are listed in the following
All d -c voltages are measured with respect to ground. If a meter that has a sensitivity
different from 20,000 ohms per volt is used, the
readings obtained may differ from the listed volt-
table.
ages.
Preamplifier Voltages
Tube Element
RCA -1620 #1 to 6
Plate
Cathode
Heater
200 v dc
8.3 v dc
v ac
6.2
Program Amplifier Voltages
RCA -1620 #7
RCA -1620 #9
Plate
155 v dc
80 v dc
70 v dc
85 v dc
270 v dc
Screen
Cathode
5 v dc
Heater
6.2 v ac
1.9 v dc
6.2 v ac
2.2 v dc
6.2 v ac
23 v dc
6.2 v ac
Tube Element
RCA -1620 #10
RCA -1621 #11, 12
Monitor Amplifier Voltages
Tube Element
Plate
RCA -1620 #8
RCA -1620 #13
RCA -1620 #14, 15
RCA -1622 #16, 17
155 v dc
115 v dc
140 v dc
5.8 v dc
6.2 v ac
4.3 v dc
6.2 v ac
6.2 v ac
340 v dc
220 v dc
12 v dc
6.2 v ac
Screen
Cathode
Heater
5 v dc
28
0
Ri
r
26
31
13
U
E-3
E -2
25
0
2
7
6
I
41
R-85
4
2
ThE
-13
9
L
R-90
A'
=
AA
7
32
4-
R-86
23_
R-89
10:1111111
44 RED
45 RED
43 RED
TB -2
41 RED
12-
42 RED
40 RED
P
Figure 25 - Relay Mounting Plate
172968-5
I
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36
Replacement Parts
Monitor Amplifier
The following list of parts is included to provide
identification when ordering replacement parts.
Order from RCA Replacement Parts Department,
Camden, New Jersey, giving the Stock Number and
Description of the parts wanted. Replacement parts
from the original parts but will be completely interchangeable with them.
LIST OF PARTS
Description
Stock
No.
Capacitor, electr., 10 mf, 475 v
R-71
R-72
R-73
13224
-5,-7,-8
C-6, -9,10,
-13
C-11, -12
F-1
F-2, -3
Capacitor, electr., 25 mf, 475 v
440-510
Capacitor, OS mf, 450-450 v
Fuse, 2 amp
Fuse, 1 amp
Reactor, RT-442-A
Reactor, XT -875-D
Potentiometer, 200 ohms
Resistor, 600-1000-1000-1000 ohms
Resistor, 12,000-6800 ohms
Resistor, 500 ohms, 4.8 w
L-1
L-2, -3, -4
P-1, -2
R-1
R-2, -3
R-4
R-5, -6
R-7
R-8, -9
Resistor, 5600 ohms, 2 w
Resistor, 180,000 ohms, 2 w
Resistor, 4700 ohms, 2 w
Resistor, 10,000 ohms, 1 w
R-10
Switch, REG-EMG, toggle
Switch, automatic cut-off
Switch, power
Transformer, power, RT-425-B
Transformer, power, XT -2550-D
Transformer, XT -2856
Clamp, capacitor
S-1
S-2
S-3
T-1
T-2
T-3
13036
4323883
14133
17568
17569
18953
17167
51373
17451
8097
19734
17248
13097
7925
19433
15874
44068
44683
18237
14088
Relay Mounting Plate
C-37, -38,
-39
R-85, -86,
-87
R-88, -89,
-90
R-115, -116,
-117
RL-1, -2
RL-3
Capacitor, electr., 25 mfd,
50 v dc
Resistor, 1400 ohms, 10 w
26410
Resistor, 15 ohms, 10 w
18236
Resistor, 120 ohms, 1/2 w
301$9
Relay, 12 v dc
Relay, 12 v dc
19186
18292
18235
Audio Terminal Board (TB -43)
R-137, -138
450 v dc
Capacitor, 0.1 mfd, doo v dc
Capacitor, electr., 10 mfd, 50 v dc
Same as C-28
Same as C-25
Capacitor, .0025 mfd, 1000 v dc
Resistor, 100,000 ohms, 1/2 w
Resistor, 2200 ohms, 1/2 w
Resistor, 820 ohms, 1/2 w
Resistor, 39,000 ohms, 1 w
Resistor, 2700 ohms, 1/2 w
Resistor, 15,000 ohms, 1/2 w
Same as R-66
Resistor, 1 megohm, 1/2 w
R-70
MI -11301-B Power Supply
C-1, -2, -3, -4,
Capacitor, electr., 8-8 mfd, 450-
C-28
C-30
C-31, -32
C-34
C-35, -36
R-66
R-67
R-68
R-69
supplied may be slightly different in form or size
Symbol
Capacitor, 0.5 mfd, 200 v dc
52943
Capacitcr, 0.25 mfd, 600 v dc
70639
Capacitor, electr., 25 mfd, 50 v. dc 26410
C-22, -23
C-24
C-25
C-26, -27
Resistor, 4700 ohms, Wins I 10
9'
0
is -
ggeOiti
R.
.6
Pin,00t-a-
A. ve
Resistor, 8202 ohms, 1/2 w
Resistoi7200 ohms, 2 w
Same as R-66
Resistor, 27,000 ohms, 1/2 w
Resistor, 470 ohms, 1 w
Resistor, 1200 ohms, 1/2 w
Resistor, 680 ohms, 1/2 w
Transformer, input, XT -3635
Transformer, output, XT -3541
Mounting, cushion; for tube socket
Socket, tube for RCA -1620, -1622
R-579
R-80
R-81
R-82
R-0, -84
R-95, -96
R-97
T-14
T -I5
17432
70638
13222
70644
3252
34767
30158
30434
30730
36714
30652
069
14250
30281
30409
30681
30731
12262
43569
43679
37396
33084
Pre -amplifiers
14 ..4
C-10-8 ;y
C-41,-42,
-43, -44
R-1
R-2
R-3
R-4
R-5
R-6
R-7
R-8
R-9
R-10
R-11
R-12
R-120
R-121
R-122
R-123
R-129
R-12
T -1;t4.0:44.
T-5,41-8440
T-16, -17
T-18, -19
'
Capacitor, 0.5 mfd, 200 v dc
52943
Same as C-1
Resistor, 100,000 ohms, 1/2 w
Resistor, 560 ohms, 1/2 w
Resistor, 2200 ohms, 1/2 w
Same as R-1
Same as R-2
Same as R-3
Same as R-1
Same as R-2
Same as R-3
Same as R-1
Same as R-2
Same as R-3
Same as R-2
Same as R-3
Same as R-1
Same as R-2
Same as R-3
Same as R -I
3252
5164
34767
Transformer, input
Transformer, output
435E1
11 595-
Same as T-1
Same as T-5
Mounting, grommet; for RCA
1620 socket
37396
33084
Socket, cushion; for RCA 1620
36A
ERRATA FOR 18-24483
TYPE 76-C CONSOLETTE
Make the following changes and additions* in the List of Parts on pages
36 and 39:
Symbol No.
Description
Stock No.
MI -11301-B Power Supply
C-11, -12
1
Capacitor, electrolytic, 40.40 mf, 450-450 v
52532
Audio Terminal Board (TB -43)
R-137, -138
1
Resistor, 4700 ohms, 1 w
69570
Monitor Amplifier
C-28
R-74, -75
*R-76, -77
R-80
Capacitor, 0.1 mf, 600 v dc
Same as R-70
Resistor, comp., 82,000 ohms, 1/2 w
Resistor, comp., 200 ohms, 2 w
70638
8064
30287
Pre -amplifiers
ci. to C-8, incl.
T-1 to T-4, incl.
T-5 to T-8, incl.
Capacitor, 0.5 mf, 200 v dc
Transformer, input
Transformer, output
52943
43569
17595
Program Amplifier
C-9, -10
Capacitor, 0.5 mf, 200 v dc
52943
*Resistor Board (TB -44)
*R-91, -92
*R-93, -94
*R-113, -114
Resistor, comp., 10,000 ohms, 1/2 w
Resistor, comp., 120 ohms, 1/2 w
Resistor, comp., 10 ohms, 1/2 w
3078
30189
34761
Change the title Audio Terminal Board (TB -42) on page 36 to Audio Terminal Board (TB -43).
IB-24483-A
C-32
22YEL
1
X T -354I
SRN
T-1542,3
01
2
O
O
5
o
60
TB -17
TB -12
306.31, 32 S. 35TO BE TWISTED
556 56 ,57,156,3 6637,33 834,
NOTE
ALL HEATER LEADS, PAI R.5-
2
XT -3 635
P.-57 BRN
BLUE
45 BLUE
ss BRN
TB 22
TB -16
21 YEL
to BLK-
29 BRN
91 BRN
113-21
BR
11
2
O
r7
U
1-'
1144.17
3635
O OTf-g7F
4"
-1
Z
33 BR
II BLK
I BLK
- R-4
T8 17
2Y
r2EL
49 RED
(4)
U
=
oca)6®®
T-2
110
cc
BLK
R-7
TB -23
23 YEL
.r)
0
111
3 BLK
cc
52
24YEL
13 BLK
r
_
34 BRN
47 RED
!Pti,Erto=isz
114
.14
0®6®®
T-3
113
3
32 BRN
19 6, 12 ELK
RED
p-
70
T -19210i
F-3635
rc
a
-
c1SC
T- 4
61E1
T13-19
tfitar-
C42.
IVO
T-8
O
®
XT -2747
; YEL
es
BLK
Ck66 BRN
R-132
TB -24
,
6 RED
Z
U
O
6 BRN
9 BLK
BLK
R
ZI
12
1-125
.
2Y
24YEL
611111M,
1°.
45 RED
0
XT -3635
T-17
4Q
®00®
280. 29, 30/31,32133.34135.
36 6 37. 38 8 39
U
5
T
'Mt
T -I9
®
(517-274
TWIST THE FOLLOWING PAIRS -
NOTE -
XT -3635
00
®1-16
®®
U
year
ITS
T -I8
CD
®®
XT -2747
cc
6
BLK-
G-1
11 V
39
LIST OF PARTS (Cont'd)
Description
Symbol
StockNo.
Program Amplifier
C-9, -10
C-11
C-12
Capacitor, 0.5 mfd, 200 v dc
Capacitor, 0.25 mfd, 400 v dc
Capacitor, electr., 25 mfd, 50 v dc
C-13,-14,
Same as C-11
-15
C-16,-17
C-18
C-19
C-20, -21
C-40
R-43
R-44
R-45
R-46
R-47
R-48
R-49
R-50
R-51, -52
R-53
R-54
R-55
R-56
R-57
R-58
R-59
R-60
R-61, -62
-63,-64
R-98,-99
R-100, -101
R-102, -103
R-118
R-119
T-11
T-12
T-13
Capacitor, electr., 8-8 mfd, 450450 v dc
Same as C-12
Same as C-11
Same as C-12
Capacitor, 1000 mmf, 500 v
Resistor, 130 ohms, 1 w
Resistor, 100,000 ohms, 1/2 w
Resistor, 820 ohms, 1/2 w
Resistor, 2200 ohms, 1/2 w
Resistor, 12,000 ohms, 1/2 w
Resistor, 910 ohms, 1 w
Resistor, 240 ohms, 1 w
Resistor, 39,000 ohms, 1/2 w
Same as R-44
Resistor, 10,000 ohms, 1 w
Resistor, 22,000 ohms, 1/2 w
Resistor, 10,000 ohms, 1/2 w
Resistor, 33,000 ohms, 1/2 w
Resistor, 68,000 ohms, 1/2 w
Resistor, 270 ohms, 1,4 w
Resistor, 56,000 ohms, 1 w
Resistor, 27,000 ohms, % w
Front Panel Assembly
52943
70618
26410
17432
39652
60079
3252
30158
34767
30436
30147
13097
30492
3078
30685
14138
17440
30409
Resistor, 985-75-75-985 ohms,
25 w
Same as R-55.
Resistor, 120 ohms, 1/2 w
Resistor, 10 ohms, 1/2 w
Resistor, 27,000 ohms, 1 w
Resistor, 680 ohms, 1/2 w
Transformer, input, XT -3635
Transformer, interstage
Transformer, output
Mounting, cushion; for RCA -1620
and -1621 tube sockets
17606
30189
34761
13477
12262
43569
17427
17567
37396
Socket, tube; for RCA -1620 and
-1621
33084
K-5,-6
K-7
Jack, phone
Switch, key A -P 1 to 3
Switch, key A -P 4
Same as K-1 (A -P 5, 6)
Switch, key, "Announce"
K-8
K-9, -10
Switch, key. "Line-out"
Switch, lever, "Phone -Mon"
P-1
P-2
Resistor, "Attenuator, Master"
Resistor, "Attenuator, Monitor"
Switch, selector -key; 9 keys
"Override -Off -Record"
- PK-1
- PK-2
' PK-3
-PK-4
R-13, -14, -15,
-16, -17, -18
R-19, -20
R-21, -22
R-23,-24
R-25, -26
R-27, -28
R-29, -30
R-31, -32,
33, -34
R-40, -41
R-42
R-65
R-104
R-111
R-124,-125
Switch, selector -key; 9 keys
Switch, selector -key; 9 keys
Switch, selector -key; 9 keys
Resistor, 270 ohms, 1 w
R-201
16999
54878
54879
54880
19573
17643
17604
54547
54533
55395
18320
54264
19785
Resistor, 270 ohms, 1/2 w, at PK-2
Resistor, 560 ohms, 1 w
Resistor, 130 ohms, 1 w, at K-6
30929
5164
60079
Resistor, 12,000 ohms, V2 w, at
tube check
Resistor, 4700 ohms, 1/2 w, at J-1
30436
30494
Resistor, 10,000 ohms, 1/3 w, at
PK-3
R-126
R-127, -128
R-130, -131,
-133, -134
R-135, -136
R-139, -140,
-142, -143
R-141, -144
R-200
53063
Resistor, 750 ohms, 1/2 w, at K-1
Same as R-19, at K-2
Same as R-19, at K-3
Same as R-19, at K-4
Same as R-19, at K-5
Same as R-19, at K-6
Resistor, 560 ohms, 1/2 w, at PK-3
3078
Same as R-31, at K-9
Same as R-124, at PK-3
Same as R-124, at PK-3
Resistor, 5600 ohms, 1/2 w, at K-9
Resistor, 1000 ohms, 1/2 w
30734
34766
Resistor, 270 ohms, V2 w
30929
Resistor,
zero -adjusting
attenua-
tor, 800 ohms
Resistor, multiplier -pad attenuator,
7100-3900 ohms
Handle
Knob, attenuator; for attenuators
1 to 6
Knob; for tube -check and VU
switches
Front Panel Assembly
J-1
K-1, -2, -3
K-4
Stock
No.
Description
Symbol
Knob; for K-9, -10
Meter, VU and tube check
Oil, attenuator
Resistor, attenuator 1 to 6
Switch, VU control
Switch, tube check
19327
19328
54532
17269
17268
54534
43186
20752
17644
19570
54546
T-12
0
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TUE FOLLOWING TERMINALS ARE
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