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BROADCAST AUDIO EQUIPMENT RADIO CORPORATIOn OF AMERICA ErIGIIIEERMG PRODUCTS Division CAMDER II. J. Type BC-6A Dual Channel Consolette 1B-24788

Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

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Page 1: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

BROADCAST AUDIO EQUIPMENT

RADIO CORPORATIOn OF AMERICAErIGIIIEERMG PRODUCTS Division CAMDER II. J.

Type BC-6ADual Channel Consolette

1B-24788

Page 2: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

EQUIPMENT LOST OR DAMAGED IN TRANSITWhen delivering the equipment to you, the truck driver or carrier's agent will present a receipt for your signature.Do not sign it until you have (a) inspected the containers for visible signs of damage and (b) counted the containers andcompared with the amount shown on the shipping papers. If a shortage or if evidence of damage is noted, insist thatnotation to that effect be made on the shipping papers before you sign them.Further, after receiving the equipment, unpack it and inspect thoroughly for concealed damage. This should be done within15 days, if possible. If concealed damage is discovered immediately notify the carrier, confirmed in writing and insist upon aninspection and report.In addition to the above, the shortages or damages should also be reported to RCA, but do not return any damaged equipmentunless we have furnished complete return shipping instructions.Transportation companies are required to adjust for damage resulting from their negligence and RCA will assist you, ifnecessary, in obtaining settlement. Accordingly, you should save all shipping papers, letters or invoices concerning theshipment until it is certain that the equipment was delivered in good condition or until any damage has been adjusted.

REPLACEMENT PARTSWhen ordering replacement parts, please give symbol, description, and stock number of each item ordered.The part which will be supplied against an order for a replacement item may not be an exact duplicate of the original part.However, it will be a satisfactory replacement differing only in minor mechanical or electrical characteristics. Such differenceswill in no way impair the operation of the equipment.The following tabulations list service parts and electron tube ordering instructions according to your geographical location.

SERVICE PARTS

LOCATION ORDER SERVICE PARTS FROM:

Continental United States, Alaska and Hawaii Service Parts Order Service, Bldg. 60, 19th & Federal Sts., Camden 5,New Jersey or through your nearest RCA Regional Office. Emergencyorders may be telephoned, telegraphed, or teletyped to RCA EmergencyService, Bldg. 60, Camden, N. J. (Telephone: WO 3.8000).

Dominion of Canada RCA Victor Company Limited, 1001 Lenoir Street, Montreal, Quebecor through your local Sales Representative or his office.

Outside of Continental United States, Alaska,Hawaii and the Dominion of Canada

RCA International Division, Clark, N.J., U.S.A. or through yourlocal Sales Representative.

ELECTRON TUBES

LOCATION ORDER ELECTRON TUBES FROM:

Continental United States, Alaska and Hawaii Local Tube Distributor

Dominion of Canada RCA Victor Company Limited, 1001 Lenoir Street, Montreal, Que-bec or through your local Sales Representative or his office.

Outside of Continental United States, Alaska,Hawaii and the Dominion of Canada

Local Tube Distributor or from:Tube DepartmentRCA International Division30 Rockefeller PlazaNew York 20, New York, U.S.A.

If for any reason, it is desired to return tubes, please return them to the place of purchase.PLEASE DO NOT RETURN TUBES DIRECTLY TO RCA WITHOUT AUTHORIZATION AND SHIPPINGINSTRUCTIONS.It is important that complete information regarding each tube (including type, serial number, hours of service and reason for itsreturn) be given.When tubes are returned, they should be shipped to the address specified on the Return Authorization form. A copy of theReturn Authorization and also a Service Report for each tube should be packed with the tubes.

LIST OF RCA REGIONAL OFFICESBoston 16, Mass. Chicago 54, Ill.

Room 2301, John Hancock Bldg. 1186 Merchandise Mart Plaza200 Berkley St. Delaware 7-0700

Hubbard 2-1700Hollywood 28, Calif.

RCA Bldg., 1560 N. Vine St.Hollywood 9-2154

Branch-San Francisco 2, Calif.420 Taylor St.Ordway 3-3027

Atlanta 3, Georgia522 Forsyth Bldg.

Lamar 7703

Dallas 1, Texas1907-11 McKinney Ave.

Riverside 1371

Kansas City 6, Missouri340 Dierks Bldg.

Harrison 6480

Cleveland 15, Ohio1600 Keith Bldg.Cherry 1.3450

New York 20, New York36 W. 49th St.Judson 6-3800

Page 3: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

BROADCAST AUDIO EQUIPMENT

INSTRUCTIONS

Type BC -6A

Dual Channel ConsoletteMI -I 1638

RADIO CORPORATION OF AMERICAENGINEERING PRODUCTS DIVISION, CAMDEN, N. J.PRINTED IN U.S.A.

5106 - 537

Page 4: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

Figure 1-Type BC -6A Consolette M1-11638

Page 5: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

1

TECHNICAL DATA

Power Required

100-130 volts, 50/60 cycles300 watts

Amplifiers

9 RCA Preamplifiers 5AR1 thru 5AR93 RCA Preamplifiers 5AR10 thru 5A12122 RCA Program Amplifiers 5AR13, 5AR142 RCA Monitor Amplifiers SARIS, 5AR162 RCA Power Supplies 5PS1, 5PS2

Inputs

10 Microphones2 Tape, Turntable

or Film5 Remote Lines1 Network3 Cue Lines

30/150 ohms

150 ohms600 ohms600 ohms

20,000 ohms

Output Lines2 Program Lines 600 ohms2 External Monitors 600 ohms5 Speakers 15 ohms5 Remote Lines (Cue) 600 ohms

VU Meter

18 dbm12 dbm6 watts (total)

18 dbm

Two 4 -inch illuminated VU Meters with Type B scale

Channels

CH 1 Two independent program output channelsCH 2 or single output channel with split mixing

Frequency ResponseProgram: = 1.5 db 30 to 15,000 cpsMonitor: =2.5 db 30 to 15,000 cps

DistortionProgram Line: Less than 0.5%

(100-15,000 cps at 18 dbm output)Monitor: Less than 1.5%

(50-15,000 cps at 6w)

Signal to Noise RatioMicrophone to Program Line(68 db gain, 18 dbm output) 68 db

Tube Complement (MI -11484 Kit Required,not supplied)

2 5R4GY4 14AU72

4 12AX74 6V6GT

10 MI -11299 (RCA selected 12AY7)12 12AY7

Dimensions and WeightWidth - 38 inchesHeight -111/2 inchesDepth - 211/2 inchesWeight- 127 pounds

Finish

Two-tone umber gray

DESCRIPTION

The Type BC -6A Dual Channel Audio Consoletteis designed to provide audio amplification, switchingcontrol and monitoring facilities essential to largeradio and TV stations. The equipment is completelyself contained. The use of etched wiring circuits forall amplifiers has allowed space for the two powersupplies and additional features. The BC -6A incor-porates nine mixer positions and provides all thefacilities needed to accommodate one or two studios,an announce booth microphone, a control roommicrophone, two transcription turntables, tape, film,five remote lines, network, and three cue circuits. -

Colored knobs on switches and controls arematched to indicate related functions. A metal bracketis mounted in the center between the VU meters tosupport the program script. A selector switch indi-cates single channel or dual channel operation:one Master gain control is used for simultaneous con-

trol of both channels and two Sub -Master controlsfor individual control of each output channel. Atotal of twenty-two inputs are available. Two VUmeters, one for each channel, are mounted on thecontrol panel.

The styling of the BC -6A matches the other RCAaudio consolettes, BC -2B, BC -3B and BC -5A, as wellas the Auxiliary Mixer BCM-1A and SwitchingConsolette BCS-11A. The styling is also suitable foralignment with TV Terminal equipment. The con-solette should be mounted on a fiat topped desk orsurface of adequate dimensions. Electrical connectionsare made to power and audio terminal blocks at theback of the consolette. Knockout holes of 1-1/16inch diameter are provided in the rear panel and onthe rear bottom of the consolette housing for theterminating conduits. The front panel is hinged atthe bottom to the consolette housing and may be

Page 6: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

2

tilted forward for servicing the inside. Two supportshold the panel in position when open so as not toallow the weight of the panel to rest on the controls.The louvred top cover may be easily removed. Thetubes are supplied separately as tube kit MI -11484and are listed in the Technical Data.

Associated Equipment

The necessary auxiliary units such as microphones,loudspeakers, turntables, tape recorders and warninglights, may be selected from the RCA catalogs. Aseparate sheet of instructions is packed with eachunit.

In regard to loudspeakers, however, a few pointsshould be emphasized. A maximum of five speakersmay be connected to each BC -6A consolette. Theloudspeaker should have a voice coil impedance of15 ohms, or an impedance matching transformerMI -11731 must be provided.

As to warning lights, the MI -11706 series are recom-mended for the studios, control room and announcebooth. The lights which are available with inscrip-tion, are listed as follows:

ON AIR MI -11706-1REHEARSAL MI -11706-2AUDITION MI -11706-3STAND-BY MI -11706-4SILENCE MI -11706-5

An MI -11702-A Warning Light Relay is requiredfor each warning light.

Circuit DescriptionThe BC -6A Consolette amplifiers are constructed

on individual etched circuit boards. External con-nections are made through turret type terminals oneach board. The boards are secured with standardhardware to a metal chassis and are easily loosened orremoved to gain access to the etched wiring.

Preamplifiers 5AR1 -5AR7Twelve preamplifiers are used in the consolette,

two units, however, are used as line amplifiers andthree units as booster amplifiers.

The preamplifier is a two -staged RC coupledamplifier using a selected 12AY7 (MI -11299) twintriode. The input signal for the microphone pre-amplifier is derived from an unloaded input trans-former which is mounted under the preamplifiermounting shelf. Negative feedback is applied fromthe plate of the second stage to the cathode of theinput stage. The output of the second stage is fed tothe potentiometer type gain control (mixer, sub -master or monitor gain control). The output signalfrom the gain control is applied to the grid of thethird stage and then to a cathode follower outputstage. A 12AY7 tube is used for the third and fourthstages. To reduce the static charge. on the outputcoupling capacitor 105, which could cause switchingclicks, the cathode resistance 1R10 is returned to anegative supply and grid bias is obtained through avoltage divider 1R12 and 1R13 such that the cathode

air 2 0GAIN Stir*.

INPUT 3

IC 20/

IV/A

c 4a

3

Nn0

/2/1Y7

/C/

.047

/C3

.047

km

IV 2,4

Boa N

q,9 ot

12AY7I V2&

IC4

.0- 4- 7

co `.9

CC

a03Fr

IC

owe -0-oh-n7

/.0

OUTPUT5

CC 4g 285s/.010

-190y.

94 5

/ R/601<-5,W-

476069 -0

o

o 7e275 V06

0 Ia 3V09

Figure 2-Schematic Diagram for Preamplifier f5AR1 -5AIM

Page 7: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

3

1311

GROUNDSTRAPR4

C3

GROUNDSTRAPI C5

II X10 9 8 716

Figure 3 Preamplifier 15A111Printed Circuit Board

of the output stage is approximately at groundpotential.

Preamplifiers SARS. 5AR9 as Line AmplifiersThe full gain of the amplifier is not required for

the network and remote line preamplifiers 5AR8 and5AR9, therefore, the input tube 1V1 is omitted andinput connection is made to the grid of the thirdstage. However, all the components are available forspecial applications requiring more gain. The fullgain of the preamplifiers 5AR8 and 5AR9 may berestored by the following changes:

1. Remove resistors 5R9 and 5R10 which are con-nected between terminals 7 and 9 of 5T8 and5T9 respectively.

2. Remove wire #597 from terminal 9 of 5T8and connect it to terminal 1 of 5AR8.

3. Connect terminal 9 of 5T8 to terminal 3 of5AR8.

4. Remove wire #598 from terminal 9 of 5T9and connect it to terminal 1 of 5AR9.

5. Connect terminal 9 of 5T9 to terminal 3 of5AR9.

I Ri

GROUNDSTRAP

GROUNDSTRAP

I XV2

Figure 4-Preamplifier (5ARIO, 5AR11, 5AR121Printed Circuit Board

6. Insert MI -11299 selected 12AY7 tubes in thesocket nearest the front of the preamplifiers5AR8 and 5AR9.

Preamplifiers 5AR1O, 5AR11 and 5AR12 asBooster Amplifiers

When the preamplifiers are used as booster ampli-fiers, they vary from the preamplifiers SARI through5AR9 as shown in figures 2 and 3. The cathoderesistors 1R14 and IRIS are connected to ground.Self bias is obtained through the voltage drop across1R15. Since no switching is performed following theamplifier, the buildup of a charge on the outputcoupling capacitor 105 is permissible. The CH 1Booster Amplifier 5AR11 and CH 2 Booster Amplifier5ARIO are controlled by CH 1 SUB -MASTER andCH 2 SUB -MASTER controls respectively. The PGM-.TB-MON Booster Amplifier 5AR12 is controlled bythe PGM MON Gain Control 5AT12.

The preamplifiers, less input transformers, have avoltagt gain of 46 db. An input signal of -50 dbmto the input transformer will produce an outputvoltage of approximately 1 volt.

Page 8: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

4

2OUT 0IN

GAIN CONTR. 1C21( 0.1

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1

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IR1 1R2 1R3 1R48200 100K I MEG 5601W-570 IC3

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1R639K

1R756001W - 570

/212AY71V2B 6

204 7 -.047

1R91MEG

1R151200

1051.0

1138, 1R141200/1K 56K

5,0/

OUTPUT5

1R11100K

08

275V

1

160K -5".

9

07C

06

265v010

63V011

476967

09

Figure 5-Schematic Diagram for Preamplifiers 5ARIO, SARI! and 5AR12

1

NPOT

2RI/00K

124X72 C /.047

2V 1 A

3

2R2180057

2 R46.80K

2R3/.50K

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7

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7

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2Ra/20 K5%

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7

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OUT06

OUT

2C235

menF.

2C5r 20 2C6.047 r"2R10390

03

2R/i/0K 285V

2R/2/8 I< -5%

753060-0

C

07FB08

Figure 6-Schematic Diagram for Program Amplifiers 5AR13, 5AR14

Page 9: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

2

9 6 7 6 5 4 3

2C1

2XV12C2

5

LINE AMP, 5AR14. The etched wiring board con -2 R I tains all the electrical components except the output

transformers 5T10 and 5T11 which are mounted onthe chassis directly in the front of each programamplifier 5AR14 and 5AR13 respectively. A 12AX7

2R6twin triode is used for the input and phase inverterstages, driving two 12AU7 twin triodes which are

2R5 connected in push-pull parallel. Negative feedback2R4 is derived from a tertiary winding on the output2R9 transformer. An input voltage of approximately 1.35

volts is required to obtain an output of 30 dbm.

Figure 7-Program Amplifier 5ARI3, 5AR14

Program Amplifiers 5AR13 - SAR14The program or line amplifiers in the BC -6A are

identified as CH 1 LINE AMP, 5AR13 and CH 2

Monitor Amplifiers SARIS - SARI6The monitor amplifiers in the BC -6A are identified

as CUE FEED MON (5AR15) and PGM TB MON(5AR16) respectively. The circuit and constructionof the monitor amplifier are similar to the programamplifiers. The transformers 5T13 and 5T12 aremounted directly in front of the monitor amplifierprinted circuit boards. To obtain rated output levelof 6 watts, a pair of 6V6-GT tubes are used in apush-pull output stage. Approximately 1.32 voltsinput are required to obtain 1 watt output. Thetransformer secondary has taps for 600/150/16/8/4ohm loading.

Power Supplies 5PS1 -5PS2The BC -6A has two power supplies, each powers a

single channel and alternate pre -amplifiers to providegreater continuity of service. The 5PS1 supplies power

3R1

10 tat'N PUT

3

3V1 A 31/1 B12 AX7

4119It H2

3R2.2200

3C1.047

3 R 41 .0MEC

3R32201( - 3c2

82 MMF

3R739K

3R51500

3R6 3C539K T82MMF

3C3.047

3R8470K

3R9470K

3C4.047

2

2

3V26V6

3R104302W

74-10H 2

7

4

3R11430

2W

3V36V6

3C625

09OUT

1114-C) 86.3V

H2.4.--0 7

OUT

3C720 3 R12

680 0

0 5

04C

285V0 6

3R I3 FEED BACK22K

0-753097-I

3

Figure 8-Schematic Diagram for Monitor Amplifier 5AR15, 5ARI6

Page 10: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

6

3R8 3XV2 3RI2 3R4

3XV3 3R9 3R10 3R11 3C4 3C5

3C3 3C6 3XVI

3R6 3R5 3C7

3R7

3R13

Figure 9-Monitor Amplifier SARIS, 5AR16 Printed Circuit Board

to odd numbered amplifiers and CH 1 VU meterlights; the 5PS2 supplies power to even numberedamplifiers and CH 2 VU meter lights.

The power supply is designed for operation from100-130 V 50/60 cycle power line. Transformerprimary taps are available for nominal line voltage of105, 115 and 125 volts. The plate supply voltages are

3R2

3R3

obtained from a 5R4GY full -wave rectifier tube andfiltered by several stages of RC networks which pro-vide both isolation and sufficiently low ripple for thevarious amplifier stages. A negative supply voltage isobtained from a 6X4 tube connected as a half -waverectifier. The 6.3 v heater winding connects througha hum adjustment potentiometer to a positive bias

411 4C1 902 4C5 4C4 4C6

5R4-GY 6 X4 4C9 4CRI TERMINAL BOARD 4T81 4R9 4C6 4C6II5V AC HUM ADJ.

Figure 10-Power Supply SPSI, 5PS2

Page 11: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

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Page 12: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

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Page 13: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

9

voltage to minimize hum due to heater to cathodeleakage. A full wave bridge type selenium rectifiersupplies d.c. power to the speaker relays. A tap isprovided on the transformer winding to compensatefor ageing of the rectifier.

Fixed Pads

Etched wiring techniques are employed in the con-struction of certain fixed attenuators. The same basicboard accommodates various circuit configuration andresistance values. The line input pads 5AT15 and5AT16 are balanced, center -tapped H type having aloss of 30 db. The external monitor pads 5AT17 and5AT18 are of the balanced L type having a loss of30 db.

Relays

Three relays are supplied mounted in the rear ofthe consolette. These are adequate for many stationlayouts; however, if two studios, with a control roomand an Announce Booth make up the station, anadditional relay must be installed. Space has beenleft for the mounting of an additional relay (5K4)beside 5K3. This fourth relay has been included inthe diagrams and photographs. Refer to the figures22 and 23. Order this relay as MI -11748 SpeakerRelay Kit.

Script HolderAs shown in figure 1, an aluminum bracket is

mounted on the BC -6A Control Panel just under the

loudspeaker toggle switches. This bracket is designedto hold the clip board which is used in broadcaststations to hold the standard 81/2" x 11" script sheets.

Overall SystemAs shown in the block diagram, figure 22, there are

five mixing channels for low level microphone inputsand two low level inputs for either turntable, tapeor film sources. Two high level mixing channels havebeen provided for the network and remote line inputchannels.

The inputs to the nine mixer channels are selectedby means of the input switches 5S1 to 5S8. The gainof each of the high level mixing channels is controlledby the mixer attenuators 5AT1 to 5AT9. The outputof each mixing channel may be connected to eitherthe channel 1 or channel 2 mixer busses. The signalis then amplified by the CH 1 and CH 2 BoosterAmplifiers. The gain of these amplifiers is controlledby the CH 1 and CH 2 sub -master gain controls.With the single -dual channel switch 5S22 in the dualposition, the output of each booster amplifier is fedthrough a section of the ganged Master gain controlto the respective line amplifier. With the switch in thesingle position, the output of the two booster ampli-fiers are combined and then fed to both line ampli-fiers. The LINE 1 switch 5S23 and LINE 2 switch5S24 permit connection of either or both lines toeither channel. Two VU meters, one for each channel,indicate program output level. Bridging pads are pro-vided for connection of external monitor amplifiers to

812 31

Figure 13-Type BC -6A Consolette with Panel Open

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10

both program channels. Two monitor amplifiers areprovided. One for program monitoring and talk -back,which connects to the speaker terminals throughmuting relays. The input to this amplifier is selectedby means of a push-button switch 5518 from controlroom microphone for talk -back, from the output ofchannel 1 or channel 2 line amplifiers for monitoringand from three cue line inputs.

A cue feed monitor amplifier is provided for feed-ing cue or background sound to the studios orcontrol room speakers without going through thespeaker muting relays. The position of the switches5525, 5S26, 5S27 and 5S28 determines whether thespeakers are fed from the Program-Talkback Monitoramplifier or the Cue Feed Monitor amplifier. Theinput to the Cue Feed Monitor amplifier is selected bya rotary switch 5S19 from REC CUE, REC 1, REC 2,NET, and REMOTE input channels and the CH Iand CH 2 outputs.

The speaker muting relays are actuated by themicrophone input selector switches and the associated

mixer output switches, and the talk -back switches toprevent acoustic feedback from speaker to micro-phone and to prevent talkback to a studio which isOn Air. The same switches and the line outputswitches also control the signal light circuits for thecontrol room, studios and announce booth. Thereare provisions for adapting the interlock circuits tovarious types of installation.

With the switch 5S21 in the OVERRIDE position,the remote lines are connected to the input of theprogram -monitor amplifier such that a call receivedover any of the remote lines will be heard over themonitor speakers. With the switch 5521 in thePHONE position, the remote lines or output channelsmay be monitored by means of headphones plugged -in to the MON-PHONE jack 5J2. The line to bemonitored is selected by means of the REMOTE -CUE -PHONE switch 5S20. With the switch 5521 inthe remote position, the output of the program -talk -back monitor is fed to the remote line selected bythe switch 5S20.

INSTALLATION

Location of ConsoletteThe BC -6A Consolette may be installed on any flat

top desk or table of suitable size. A minimum of 1/2inch clearance should be allowed between the rear ofthe consolette and the wall. Refer to the typicalinstallation and dimensional drawings figures 14

and 15.

Type of InstallationA typical broadcast installation for a dual channel

studio system using the BC -6A Consolette is shown infigure 16.

WARNINGDo not remove top cover or open frontpanel with power turned on unlessthoroughly familiar with this equipment.High voltages appear on the etched wiringboards and terminal blocks. Caution mustbe exercised when replacing tubes or servic-ing this equipment with power turned on.

Tube InstallationTubes are not supplied with the consolette and

must be ordered as MI -11484. Insert the tubes in the

16.25

8-1.06 DIA. KNOCKOU TS

3 EQUAL SPACES @ 2.88 - 8.64

sibJAP1/4% SPACES el, a ea = 8.64 1-

90'

GO":1.-r

38483488-0

Cki

In

Figure 14-Installation Diagram for BC -6A

Page 15: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

11

CONDUIT BOX MAY BE SETIN WALL OR FLOOR AS SHOWN

CONSOLETTE

a1 likAW

THREE FLEXIBLESTEEL CONDUITS

Pi

Ca

0Cj

kj

OPTIONAL METHOD eiOF INSTALLATION

ClIGl

rj

fa

/777. /C /7/7FLOOR

lezn1

WINDOW

S CONDUITBOX

WALL

.d/2.17,777G <7a7CONDUIT 484337

Figure 15-Typical Cable installation

sockets as called for by figure 20. Install the selected12AY7 (MI -11299) tubes in the sockets nearest thefront (or top) of the preamplifiers and boosteramplifier printed wiring boards. Slip the shields overthe tubes where tube shield ground straps are pro-vided on the sockets making certain that the groundstrap is wedged between the tube envelope and theshield.

Power Supply Connections

The Consolette has two power supply units, 5P51and 5PS2; each unit powers a single channel andalternate pre -amplifiers which provides a greater con-tinuity of service. Both units are coMpletely self-contained.

When shipped, the power transformers are con-nected for power line voltage of 110 to 120 volts. Ifthe line voltage is outside this range, remove the fourscrews in each corner of the power supply chassis.Turn the power supply units chassis upside down.Remove the wire leading to terminal #3 of thepower transformer 4T1. If the line voltage is between100 and 110 volts, connect this wire to terminal #2;if it is between 120 and 130 volts, connect the wire toterminal #4. Replace the Power Supply. Connect thea.c. power line to the barrier type terminal block

4TB1 directly behind the power transformer onpower supply 5P51.

Microphones, Turntables, Tape Recorders andFilm Projectors

Connect microphones and turntables according tothe table of connections on 5TB1. All microphonesinstalled in the same studio should be phased alike.The input transformers 5T1 through 5T7 are con-nected for a balanced 150 -ohm input. If a 600 -ohminput is desired, reconnect as shown for 5T8 by re-moving the jumper between terminals 1 and 3 and4 and 6 and jumper terminals 3 and 4. Remove thewire leading to terminal 5 and connect to terminal 4.

If a 37.5 ohm input is desired, remove the jumpersbetween terminals 1 and 3 and 4 and 6 and jumper1 and 5 and 2 and 6. A center tap is not availablefor this impedance. If the tape recorders and filmprojectors have a higher output than microphonelevel ( -50 dbm), an attenuator network (pad)should be connected between the output of eachrecorder or projector and the input of the consolette.

Remote Line and Network InputsTwo 600/600 ohm pads, 5AT15 and 5AT16,

having a loss of 30 db are inserted ahead of the input

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12

transformers 5T8 and 5T9 respectively. This pad maybe modified or removed if so desired. The inputtransformers 5T8 and 5T9 are connected for 600 -ohminput. If desired they may be connected for 150 -ohmsby arranging the jumpers as shown in the schematicand wiring diagrams for 5T1.

Line EqualizerA line equalizer such as the RCA BE -2A

(MI -11752) may be connected between terminals45-46 of 5TB1 (input) and 49-50 (output). If afour terminal equalizer is used, the jumpers between45-49 and 46-50 should be removed.

Program LinesThe program output lines, LINE 1 and LINE 2,

are connected to terminals 73 and 74, and 75 and 76respectively. A dividing and isolation network havinga loss of 6 db is included in the consolette.

External Monitor OutputExternal monitor amplifiers may be connected to

the built-in bridging pads 5AT17 and 5AT18, havingan output impedance of 600 ohms, by making con-nections to terminals 77 and 78 for the CH 1 EXT.MON 1 and terminals 79 and 80 for the CH 2EXT. MON 2.

Loudspeaker ConnectionsThe control room speakers are connected to

terminals 89 and 90 and 91 and 92. Studio A speakeris connected to terminals 93 and 94; Studio B speakerto terminals 95 and 96 and the Announce Boothspeaker to terminals 97 and 98.

The loudspeakers should have a voice coil imped-ance of 15-16 ohms. For other voice coil impedances,a matching transformer is suggested.

RI

R5

R2

R2

Figure 16-Fixed Pads 5AT15 15AT161 and5.4717 ISATIS/

External Connections

Audio wiring should be segregated into low level(microphone, turntable, tape recorder or film) andhigh level (line input and output) cables or conduits;low level audio wiring should be kept away from ACpower and signal light circuits. Connect a ground tothe heavy bus wire adjacent to the audio terminalblock.

CONNECTIONS AT TERMINAL BLOCK 5TBI

CR MicrophoneStudio A MicrophoneAnnounce Booth MicrophoneStudio A Microphone 2Studio B Microphone 3Studio A Microphone 3Studio B Microphone 4Studio A Microphone 4Studio B Microphone 5Studio A Microphone 5Tape t

Film I

Turntable I

Tape 2Film 2

Turntable 2NetworkRemote LineRemote Line 2Remote Line 3Remote Line 4Remote Line 5Equalizer InputEqualizer OutputCUE ICUE 2

44/CUE 3JLine Amp CH 1 (output)Line Amp CH 2 (output)PGM TB MON (Input CH 1)PGM TB MON (Input CH 2)Line t OUTLine 2 OUTEXT. MON CH IEXT. MON CH 2PGM TB MON (output) (4 ohm)PGM TB MON (output) (600 ohm)CUE FEED MON (output) (4 ohm)CR CUE (speaker)CR MON (speaker)ST A (speaker)ST B (speaker)AN B (speaker)24 v Relay supply

.,,Control Room CH 1 Signal Light Rly.',Control Room CH 2 Signal Light Rly.',Studio A CH 1 Signal Light Rly.vStudio A CH 2 Signal Light Rly.',Studio B CH 1 Signal Light Rly.'Studio B CH 2 Signal Light Rly.

ANN Booth CH 1 Signal Light Rly.ANN Booth CH 2 Signal Light Rly.

1-2

3-45-67-8 h9-10

11-12

13-1415-1617-1819-2021-2223-2425-2627-2829-3031-3233-3435-3637-3839-404I-4243-4445-4649-5053-5455.5657-5865-6667-6869-7071-7273-7475-7677-7879-8081-8283-8487-8889-9091-92

93-9495-9697-98

101-102105-106107-108109-11'0111-112113-114115-116117-118119-120

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13

Announce Booth SpeakersIf an announce booth speaker is to be used in

addition to a single studio and control room, as aprogram source for the consolette, the announcebooth speaker should be connected to the Studio Bspeaker terminals (95-96). If the announce booth isused in a two studio installation, an additional relay,5K4, resistor 5R72 and capacitor 5C4 must beinstalled in the space provided on the relay bracketadjacent to the 5K3 relay. These components may beobtained by ordering the MI -11748 Speaker RelayKit. All wiring is provided. Follow the wiringdiagram in making connections.

Warning LightsMI -11702A warning light relays, operated by the

microphone input selector switches, mixer and lineoutput switches may be connected to the appropriateterminals of 5TB1 (see table of connections). Theserelays in turn will actuate the MI -11706 Series ofwarning lights.

Hum AdjustmentsBefore placing the consolette in operation, make

the following adjustments:

1. Set the input selector switches 551 to 5S5 tothe center OFF position. Make sure that theother inputs are terminated in a resistance.

2. Set the mixer output switches 5S9, 11, 13, 15,and 17 to CH 1 and 5S10, 12, 14 and 16 toCH 2.

3. Set mixer and sub -master and master gain con-trols to max. gain position (5AT1 to 5AT11and 5AT14). Set SINGLE -DUAL CHANNELswitch 5S22 to DUAL.

4. With the LINE 1 output switch on CH 1, adjustthe hum control 4R9 on the power supply 5PS1for minimum hum at LINE 1 output terminals73-74. With the LINE 1 output switch onCH 2, adjust the hum control 4R9 on the powersupply 5PS2 for minimum hum at LINE 1output, terminals 73-74.

Cue Switches on Mixer Gain ControlsThe mixer attenuators 5AT6 and 5AT7 in the

Turntable, Tape or Film channels are provided withswitches which connect the output of the first twostages of the pre -amplifiers to the Cue Feed Mon.Amplifier when the cue feed selector switch 5S19 isin the REC. CUE position. This permits the cueingof one turntable, tape recorder, or film projectorwhile the other is feeding program.

If it is desired to have cue switches on the othermixer control, attenuators with built-in cue switchesmay be obtained from Replacement Parts by orderingStock #211003.

VU Meter AttenuatorTwo VU meters, one for each channel, are

mounted on the front panel of the BC -6A Consolette.Each VU meter attenuator is designed to give a meterreading of 100 (0 on the VU scale) with an output

STUDIO A

WARNING

MIKEr MINE MIKE MIKE LIGHTSrpm THE AIR 12 3 5 STUDIO

MONITOR

3 8 0SPEAKER

1S7AUDITION I

M KE

STUDIO B

WARNING

MILIGHTS

KE MIKE ITHE AIR

AUDITION I

STUDIOMONITORSPEAKER

ANNOUNCE BOOTH

WARNINGLIGHTS

ANNOUNCE e--ION THE AIR

AUDITION I

STUDIOMONITORSPEAKER

CONTROLROOM MIKE

WARNINGLIGHTS

ON THE AIR

AUDITION

0TURNTABLE

NO IURNTABLE

NO 2

TAPE REC TAPE REC.NO I NO2

CONTROL ROOM

CONTROLROOM

MONITORSPEAKER

CONTROLROOMCUE

SPEAKER

0 0 00000000

"0 0 0 0 0 0 0 0 0 0

BC -6A

00 0 0 0 0 0

0 0 0

A A A A A AI,/ A A A

,...4PROJECTOR

NO 2

PROJECTOR

NO I

-TRANSMITTER LINE NO I-TRANSMITTER LINE NO2

NETWORK REM REM REM REM REM ExT EAT EXT CH I CH 2FEED IN LINEI LINE,2 LINE) LINE4 LINES CUE I CUE 2 CUES EXT EXT

IN IN IN IN IN IN IN IN MON MON

Figure 17-Typleal Installation for Studio

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14

of 8 dbm delivered to a 600 -ohm load connected tothe program output terminals for each channel. If itis desired to have the meters read 100 at anotheroutput level, replace resistors 5R33, 5R34, 5R35 formeter 5M1 and resistors 5R47, 5R48, 5R49 for meter5M2 with the values contained in the table shownbelow:

Output Level(DBA4)

5R33and 5R47

ohms

5R34and 5R48

ohms

5R35and 5R49

ohms

--2 0 3600 omit0 447 4047 167902 883 4482 81804 1296 4896 5220

6 1679 5279 36908 2026 5626 2741

10 2334 5934 2091

12 2603 6203 1621

14 2833 6433 1268

Control CircuitsThe consolette is shipped with the control circuits

wired for installations consisting of a control roomand two studios. Refer to figure 23.

1-- 5518TALKBACK

ST AST B

REM

5519

5ATI 5AT2

PROGRAM MONITORIN PUT

H IH 2

CUE ICUE 2CUE 3

5A112

Single Studio InstallationIf the consolette is to be used with a single studio,

the Studio A and Studio B microphones may becombined in the one studio. To adapt the interlock-ing functions for the type of operation, the strappingon terminal board 5TB2 must be chatiged. Thisterminal board is located on the inside of the panelbetween the two VU meters. Remove all jumper wiresbetween terminals and add jumpers between the fol-lowing terminals: 8-9, 12-19, 13-20, 14-15, 16-17,

21-22 and 23-24.

Talkback InterlockThe control circuits are interlocked to prevent talk -

back to a studio when a studio microphone feeds onoutput line through either channel.

If it is desired to use CH 1 as one audition channelto permit talkback to the studios while a microphoneis feeding an output line through channel 2, installjumpers between terminals 5-20 and 6-7 on terminalboard 5TB2.

POWER5526 5529 5S27

5MI 5525 5XF1 5XF2 5528

SCRIPT SUPPORT

5AT3 5AT4

551 5S2 5S3 554 5S5 556

5ATIO 5ATI I/

\ iSUBMASTERS

CH I a2

5512

5AT5

MASTER5/1114 5521

5M2 5AT8

5AT6

- MIXERS- - - -- _

5520

5AT7

5523 5513 5524 5514 5516 5515CHANNEL LINE! LINE2 1

I I

-SELECTORS -I - - - L -I- -I- -CHI CH 2

557 INPUT SELECTORSL _L _L ___ 1_ J

5517

558

5J2

Figure 18-Control Panel

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15

OPERATION

The front panel, figure 18, and the chart ControlFunctions supply complete identification and functionof all controls and switches on the control panel. Itis advisable to be familiar with this information forthorough understanding of the flexibility of theequipment.

Routine Procedure

Turn the power switch ON and allow the equip-ment to warm up approximately 5 minutes. Theoperating procedure for putting a program ON theair from either studio, using any combination ofinputs is as follows:

1. Select the input desired.

2. Move the corresponding CH 1/CH 2 mixerswitch to the desired channel.

3. Turn corresponding mixer attenuator up.

4. Turn the MASTER and SUB -MASTERS 1 or 2gain controls to the level desired. The master gaincontrol 5AT14 should normally be set at or near themaximum clockwise position.

5. Check the level on the VU meter.

6. Monitor the selected input by pressing thePROGRAM TALKBACK Monitor -INPUT pushbut-tons CH 1 or CH 2, to the selected input. The NETor REM inputs may be monitored through head-phones plugged into the jacks 5J1 and 5J2

respectively.

Single and Dual Operation withMaster Gain Controls

The SINGLE CHANNEL/DUAL CHANNELswitch should be set immediately after the power isturned ON. While the program sources may beadjusted by the individual mixer, groups of mixersmay be adjusted with the sub -master or master gaincontrols.

The possible adjustments for each type of opera-tion are as follows:

1. Dual Channel Operation

Dual channel operation is the transmitting oftwo programs over two separate outputs; each pro-gram is a combination of inputs. Each input is

adjusted by its individual mixer. Then adjust theSUB -MASTER gain controls until the VU meters,one for each channel, indicate peaks of 100%. If it isdesired to fade each channel independently, use theappropriate sub -master gain control. If it is desiredto fade both channels simultaneously, use the

MASTER gain control. In the usual operation, how-ever, this control should be set between 16 and 20.Set the LINE 1 and LINE 2 lever switches to thecorresponding CH 1 and CH 2 positions.

2. Single Channel OperationSingle Channel operation is the transmitting of

one program over one or both output lines. The pro-gram sources may be adjusted for the desired outputlevel by the individual mixers or in groups by theSUB -MASTER gain controls. These program sourcesif divided between the outputs, CH 1 or CH 2, maybe adjusted as desired using the SUB -MASTER gaincontrols or the whole program may be faded in orout by means of the MASTER gain control. Set theLINE 1 and LINE 2 output switches to either CH 1or CH 2 as the same program is being fed over boththe CH 1 and CH 2 line amplifiers.

Program Monitoring1. Set the LOUDSPEAKER toggle switches, 5S25

through 5S28, to the PROGRAM TALKBACKposition.

2. Press pushbutton CH 1 or CH 2 of switch 5S18to monitor the output of the line amplifiers for CH 1or CH 2 respectively.

3. Adjust the PROGRAM TALKBACK MONI-TOR gain control 5AT12 for the desired output levelover the loudspeakers.

4. The program monitor will be heard over thecontrol room, studio and announce booth speakersprovided the microphone in the same room is not"ON". By "ON" is meant that an input selectorswitch is set to the particular room (Control Room,Announce Booth, Studio A or B) and its associatedmixer output switch is in either the CH 1 or CH 2position.

Talkback

1. To talkback to Studio A or Ba. Make certain that the studio selected for the

talkback operation is not on the air. Due tointerlocking circuits, it is impossible to talk -back to a studio which is on the air.

b. Press the pushbutton STA or STB on theTALKBACK switch 5S18.

c. Use the control room microphone.

d. Adjust the level by means of the PRO-GRAM-TALKBACK MONITOR gain con-trol 5AT12.

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16

CONTROL FUNCTIONS

PanelDesignation Symbol

ColorKnob Function

Coordinatedwith

INPUT SELECTOR SWITCHES

MIC 1

CRST AMIC 2AN BST AMIC 3ST BST AMIC 4ST BST AMIC 5ST BST AREC ITAPE 1FILM ITT 1REC 2TAPE 2FILM 2TT 2REMOTE INPUT

5S1

5S2

5S3

5S4

5S5

5S6

5S7

5S8

Black

Black

Black

Black

Black

Blue

Blue

Black

Connect microphone in control room or in Studio Athrough preamplifier 5AR1 to mixer 5AT1

Connects microphone in announce booth or in Studio Athrough preamplifier 5AR2 to mixer 5AT2

Connects microphone in Studio B or in Studio Athrough preamplifier 5AR3 to mixer 5AT3

Connects microphone in Studio B and Studio A throughpreamplifier 5AR4 to mixer 5AT4

Connects microphone in Studio B and Studio A throughpreamplifier 5AR5 to mixer 5AT5

Connects tape recorder 1, film projector 1 or turntable 1through preamplifier 5AR6 to mixer 5AT6

Connects tape recorder 2, film projector 2 or turntable 2through preamplifier 5AR7 to mixer 5AT7

Connects from 5 lines through the preamplifier 5AR9to mixer 5AT9

5S9, 5AT1

5S10, 5AT2

5S11, 5AT3

5512, 5AT4

5513, 5AT5

5S14, 5AT6

5515, 5AT7

5S17, 5AT8

MIXER ATTENUATORS

MIC 1

MIC 2

MIC 3MIC 4MIC 5REC 1

REC 2

NETWORKREMOTE

5AT15AT2

5AT35AT45AT55AT6

5AT7

5AT85AT9

BlackBlack

BlackBlackBlackBlue

Blue

BlackRed

Controls the gain of mic in control room and Studio AControls the gain of mic in announce booth andStudio AControls the gain of mic in Studio B and AControls the gain of mic in Studio B and AControls the gain of mic in Studio B and AControls gain for tape reproducing, film or turntablefor unit 1

Controls gain for tape reproducing, film or turntablefor unit 2Controls gain of network lineControls gain for remote lines (5)

5S1, 5S95S2, 5510

5S3, 5S115S4, 5S125S5, 5SI35S6, 5S14

5S7, 5S15

5J1, 5S165S8, 5S17

CHANNEL SELECTOR SWITCHES

CH 1- CH 2 5595S105S1155125S135S145S1555165517

BlackBlackBlackBlackBlackBlueBlueBlackRed

Connects the output of preamplifiers to CH 1 busor CH 2 bus

5AT I5AT25AT35AT45AT55AT65AT75AT85AT9

GAIN CONTROLS

MASTERSUB MASTER ISUB MASTER 2

5AT145ATI15AT10

BlackGreenGreen

Controls gain of CH 1 and CH 2 outputsControls the gain for CH 1 output onlyControls the gain for CH 2 output only

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17

PanelDesignation Symbol

ColorKnob Function

Coordinatedwith

4

LINE OUTPUT SWITCHES

LINE 1LINE 2

5S235S24

GreenGreen

Selects channel 1 or channel 2 outputSelects channel 1 or channel 2 output

SELECTOR SWITCH

SINGLE CHANNEL

DUAL CHANNEL

5S22 Black Selects type of operation; two independent outputchannels (DUAL) or single output channel with splitmixers (SINGLE)

REMOTE LINE CONTROLS

REM CUE PHONE

REMOTEPHONEOVERRIDE

5S20

5521

Black

Black

Positions: CH 1- CH 2 - Remote Line 1 through 5.Selects input to monitor phone (5J2). Selects remoteline for talk -back and CUE

Three -position switch; PHONE to hear the remoteprogram and determine if it is one desired throughheadphones in jack 5J2. OVERRIDE position connectsinput of PGM TB MON to unused remote lines. Signalfrom remote line overrides program being monitored.REMOTE position used to talkback to remote line.

5S85521

5AR16

MONITORING CONTROLS

PROGRAMMONITOR INPUT

ST AST BREM

CH 1CH 2CUE 1CUE 2CUE 3

PROGRAM TALK-BACK

MONITOR GAIN

CUE FEEDMONITOR INPUTSELECTOR

OFF

REC: CUE

REC 1REC 2NETREMOTECH 1CH 2

CUE FEEDMONITORGAIN CONTROL

5SI8

5AT12

5S19

5AT13

RedRedRed

BlackBlackBlackBlackBlack

Black

Black

Black

Selects input for program talkback monitor channel

Pushbuttons Talkback to Studio ATalkback to Studio BTalkback to Remote Line

Pushbuttons Monitor Program CH IMonitor Program CH 2Monitor Cue Line 1Monitor Cue Line 2Monitor Cue Line 3

Adjusts output Level of program-talkback monitoramplifier

Selects input for Cue Feed Monitor amplifier

Recorded Input Channels

REC. Input 1REC. Input 2NETRemote lines 1 to 5Channel 1

Channel 2

Controls output Level of Cue Feed Monitor Amplifier

5ATI2

5S20, 5S21

5518

5ATI3

5S6, 5S75AT6, 5AT7556, 5AT65S7, 5AT75AT85S8, 5AT9

5S19

LOUDSPEAKER SWITCHES

CRST AST BAN B

5S255S265S275S28

ChromeChromeChromeChrome

Control Room SpeakerStudio A SpeakerStudio B SpeakerAnnounce Booth Speaker

Each toggle switch has two positions: PROGRAM-TALKBACK: CUE FEED

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18

e. In a single studio installation, use the STAbutton to talk to the studio and the STBbutton to talk to the Announce Booth.

f. In a two -studio installation, use any talkbackbutton to talk to the Announce Booth.

NOTE : The above procedure "f" is applicableonly when the optional relay is installed.

2. To talkback over a remote line

a. Press the REM pushbutton of the TALK -BACK switch 5S18.

b. All loudspeakers are silent.

c. Select the remote line on the REMOTE -CUE -PHONE selector switch 5S20.

d. Place the OVERRIDE -PHONE -REMOTEswitch 5S21 at the REMOTE position.

Cue Line Monitoring

Three cue lines may be selected by means of theCUE 1, CUE 2 and CUE 3 buttons of the switch5S18. This is heard over the program talkbackmonitor.

Cue and BackgroundSet the loudspeaker toggle switches, 5S25 through

5S28 which correspond to the speaker over which cueor background sound is to be transmitted to theCUE FEED position.

NOTE: If a separate CUE FEED speaker is in-stalled in the Control Room, it is not necessary tothrow the switch 5S25 to the CUE FEED position.

1. To cue recorded input channelsa. Set the cue feed monitor input selector switch

5S13 to REC CUE position.

b. Set the selector switch 5S6 or 557 to thesource to be cued-TAPE, TT, FILM.

c. Turn the mixer gain control of the channelsto be cued to 0 or maximum counter clock-wise position.

d. Adjust the gain by means of CUE -FEED -MONITOR GAIN control, 5AT13.

2. To cue or feed background from the REC 1or REC 2 channels

a. Set 5S19 to REC 1 or REC 2 position.

b. Set 556 or 5S7 to the desired source.

c. Output level is determined by the positionof the mixer gain controls 5AT6 or 5AT7and 5AT13.

3. To cue or feed background from NETWORKor REMOTE LINES

a. Set at 5S19 to the NET or REMOTEposition.

b. Select the remote source by means of 5S8.

c. Adjust the level by means of 5AT8 or 5AT9and 5AT13.

4. To derive cue or background with switch 5S19set at CH 1 or CH 2

a. Care should be taken not to feed backgroundto a studio from CH 1 or CH 2 if a micro-phone in that studio is a source for CH 1 orCH 2 since the loudspeakers are not mutedwhen connected to the cue feed monitoramplifier.

b. Background may be fed to a studio from aprogram originating in another studio, con-trol room or announce booth provided thereis sufficient acoustic isolation.

Locating Program Over Remote Lines

If it is not known over which of the five remotelines a program is to be received, either of the follow-ing procedures may be used:

1. Using Headphones

a. Plug a headset into the MONITOR PHONEjack 5J2.

b. Set the switch 5S21 to the PHONE position.

c. Rotate the. switch 5S20 through line 1 toline 5 position until the desired program isheard.

d. The pointer of the switch knob (5S20) indi-cates the number of the desired line.

2. Using Monitor Speaker

a. Set the switch 5S21 to the OVERRIDEposition.

b. Rotate the switch 5S20 through line 1 toline 5 positions until the desired programis not heard.

c. The pointer of the switch (5S20) knob indi-cates the number of the desired line.

NOTE: With either of the above methods, it is notpossible to hear a program originating over a remoteline which is selected by the remote input selectorswitch 5S8. Do not depress the CH 1 or CH 2 buttonsof the PROGRAM-TALKBACK MONITOR inputselector switch 5S18 while using the override feature.

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18

e. In a single studio installation, use the STAbutton to talk to the studio and the STBbutton to talk to the Announce Booth.

f. In a two -studio installation, use any talkbackbutton to talk to the Announce Booth.

NOTE: The above procedure "f" is applicableonly when the optional relay is installed.

2. To talkback over a remote linea. Press the REM pushbutton of the TALK -

BACK switch 5518.

b. All loudspeakers are silent.

c. Select the remote line on the REMOTE -CUE -PHONE selector switch 5S20.

d. Place the OVERRIDE -PHONE -REMOTEswitch 5S21 at the REMOTE position.

Cue Line MonitoringThree cue lines may be selected by means of the

CUE 1, CUE 2 and CUE 3 buttons of the switch5518. This is heard over the program talkbackmonitor.

Cue and BackgroundSet the loudspeaker toggle switches, 5S25 through

5S28 which correspond to the speaker over which cueor background sound is to be transmitted to theCUE FEED position.

NOTE: If a separate CUE FEED speaker is in-stalled in the Control Room, it is not necessary tothrow the switch 5S25 to the CUE FEED position.

1. To cue recorded input channelsa. Set the cue feed monitor input selector switch

5S13 to REC CUE position.

b. Set the selector switch 5S6 or 5S7 to thesource to be cued-TAPE, Tr, FILM.

c. Turn the mixer gain control of the channelsto be cued to 0 or maximum counter clock-wise position.

d. Adjust the gain by means of CUE -FEED -MONITOR GAIN control, 5AT13.

2. To cue or feed background from the REC 1or REC 2 channels

a. Set 5S19 to REC 1 or REC 2 position.

b. Set 5S6 or 5S7 to the desired source.

c. Output level is determined by the positionof the mixer gain controls 5AT6 or 5AT7and 5AT13.

3. To cue or feed background from NETWORKor REMOTE LINES

a. Set at 5S19 to the NET or REMOTEposition.

b. Select the remote source by means of 5S8.

c. Adjust the level by means of 5AT8 or 5AT9and 5AT13.

4. To derive cue or background with switch 5519set at CH 1 or CH 2

a. Care should be taken not to feed backgroundto a studio from CH 1 or CH 2 if a micro-phone in that studio is a source for CH 1 orCH 2 since the loudspeakers are not mutedwhen connected to the cue feed monitoramplifier.

b. Background may be fed to a studio from aprogram originating in another studio, con-trol room or announce booth provided thereis sufficient acoustic isolation.

Locating Program Over Remote Lines

If it is not known over which of the five remotelines a program is to be received, either of the follow-ing procedures may be used:

1. Using Headphones

a. Plug a headset into the MONITOR PHONEjack 5J2.

b. Set the switch 5521 to the PHONE position.

c. Rotate the. switch 5S20 through line 1 toline 5 position until the desired program isheard.

d. The pointer of the switch knob (5S20) indi-cates the number of the desired line.

2. Using Monitor Speaker

a. Set the switch 5S21 to the OVERRIDEposition.

b. Rotate the switch 5S20 through line 1 toline 5 positions until the desired programis not heard.

c. The pointer of the switch (5520) knob indi-cates the number of the desired line.

NOTE: With either of the above methods, it is notpossible to hear a program originating over a remoteline which is selected by the remote input selectorswitch 5S8. Do not depress the CH 1 or CH 2 buttonsof the PROGRAM-TALKBACK MONITOR inputselector switch 5S18 while using the override feature.

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To Feed Cue to a Remote Line1. Select the program to be fed over a remote line

on the Program Talkback Monitor amplifier.2. Select the remote line over which the cue signal

is to be fed by means of the switch 5S20.3. Set the switch 5521 to REMOTE position.4. Adjust the level by means of the PROGRAM-

TALKBACK MONITOR GAIN control 5AT12.

Emergency OperationIn case of failure of one power supply, the program

may be continued with reduced facilities on onechannel. Power Supply 5PS1 supplies power to odd -

numbered pre -amplifiers, channel 1 booster and lineamplifiers, cue feed monitor amplifier, and channel 1VU meter lamps. Power Supply 5P52 supplies powerto the even -numbered pre -amplifiers, the channel 2booster and line amplifiers, the program talkback

monitor amplifier and the channel 2 VU meterlamps. Each power supply is individually fused. Thefuse holders are mounted on the front panel betweenthe VU meters.

In case of failure of the power supply 5PS1, switchthe mixer output selector switches and line outputselector switches to CH 2. Use only MIC 2, MIC 4,REC 1 and NET mixing channels. If a remoteprogram is to be carried, the remote line should bepatched into the network input.

In case of failure of the power supply 5PS2, switchthe mixer output selector switches and the line outputswitches to the channel 1 position. Use only MIC 1,MIC 3, MIC 5, REC 2 and REMOTE mixingchannels. If it is necessary to transmit a networkprogram, patch the network line into one of theremote line inputs. Use the cue feed monitor amplifierfor monitoring the program.

MAINTENANCEThe BC -6A Dual Channel Audio Consolette may

be easily serviced without disturbing the installation.The top cover which can be easily removed is fastened

to the consolette by four Camloc fasteners. The frontpanel is hinged at the bottom and secured at the topby two Camloc fasteners. The front panel is held inthe open position by two fall -supports.

Tubes

The tubes of the amplifiers and power supplyshould be checked periodically either in a tube testeror by measuring the socket voltages. Refer to theTube Socket Voltage chart. The values shown are

with a voltmeter having a resistance of20,000 ohms -per -volt. Slight variations may be dueto component tolerances.

TUBE SOCKET VOLTAGESTubeSocket

1 2 3 4 5 6 7 8 9

PRE -AMPLIFIER (5AR1 - 5AR9)IXVI 175-205 0 4-5 * * 140-170 0 1.7-2.0 **IXV2 115-140 0

1

3-4 * * 285 - -0.2 +0.2 *BOOSTER -PREAMPLIFIERS (SARI 0 - SAR12)

IXVI 175-205 0 4-5 * 140-170 0 1.7-2.0 **IXV2 115-140 0 3-4 * * 285 - 110-130 **

PROGRAM AMPLIFIER (5AR13 - 5AR14)2XV1 130-150 0 1.15-1.40 * * 180-210 - 55-65 **2XV2 280 0 10-12 * * 280 0 10-12 **2XV3 280 0 10-12 * * 280 0 10-12 **

MONITOR AMPLIFIER (SARIS - 5AR16)3XV I 125-145 0 1.10-1.30 * 225-250 - 38-48 **

3XV2 - * 285-290 290 - - ** 15-18 -3XV3 - * 285-290 290 - - ** 15-18 -

POWER SUPPLY (5PS1 - 5PS2)4XVI - 380*** - 365 AC - 365 AC - 380*** -4XV2 -380 -I

365 AC* 365 AC* - -380 365 AC - -5 VAC between points marked ***

6.3 VAC between terminals marked by single and double asterisks.

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O

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Page 26: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

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Fuse

Two power fuses are located on the control panelcenter top. These fuses should be replaced only witha Type 3AG, 3 amp time lag fuse.

Care of Variable AttenuatorsTo remove the attenuator cover, press the latch

under the cover and remove it by twisting the covercounterclockwise. The rear section of the MASTERgain control 5AT14 may be removed to gain accessto the contacts of the front section. Apply Davenoilto the contacts and rotate the knob several times.Wipe the contacts clean using a soft cloth and applya thin film of Davenoil. Replace attenuator cover.A bottle of Davenoil is packed with the consolette.

Care of Switches. Relays and SocketsThe switches and relay contacts do not require

periodic maintenance and should not be tamperedwith. Contacts of the tube sockets are cleaned best, bypulling tubes in and out of the socket several times.

Replacement of Input Transformers 5T1 to 5T9To gain access to the input transformers, the pre-

amplifier mounting shelf must be loosened. Removethe top cover and open the front panel if desirable.Remove the four screws and hardware located be-tween the SARI and 5AR2 and between the 5ARIOand 5AR11 amplifier circuit boards. This hardware isvisible in figure 20. Lift the shelf up from the frontand tilt it backwards to expose the transformers.

Replacement of Output Transformers 5T10 thru5T13, and Attenuators 5AT17 and 5AT18

To gain access to the terminals and mountinghardware of the output transformers and pads 5AT17and 5AT18, the mounting shelf of the program andmonitor circuit boards must be tilted up. Remove thefour screws, one from each corner. No leads need tobe removed from the circuit boards to service theseassemblies.

Power Supplies 5PS1 and 5PS2Each power supply chassis is secured to the con-

solette cabinet by four screws, one in each corner.To gain access to the components and wiring under-neath the chassis, remove the screws and carefullyturn the power supply upside down. The intercon-necting leads are long enough to permit this changein position without disconnecting them. Make surethat the power is turned off when attempting toservice the power supplies.

Servicing of the Etched Wiring BoardAssemblies

The etched wiring boards are made of .062 inchthick paper base phenolic laminate to one side of

which is bonded a thin sheet of copper. The conduc-tor pattern is formed by an etching process. Com-ponent leads are threaded through holes which arepunched into the board. The ends of the leadsextending through the board are bent over againstthe copper conductors. The complete assembly is

subsequently dip -soldered.

Components may be replaced easily by followingthese simple instructions. Care should be observednot to break or crack the board by undue stress or todamage the bonding adhesive by applying too muchheat during soldering.

1. Tools Required

1. A small (35 watt or less) pencil type solder-ing iron

2. A pair of small diagonal cutters

3. A pair of small long nose pliers

4. A scribe or pick

5. A small knife

2. Emergency Repairs

If it is known which compound is defective,it may be replaced without removing the boardfrom its mounting.

a. In the case of a small component, such as a1/2 or 1 watt resistor, cut the component inhalf using diagonal pliers. Crush the bodyby means of the long nose pliers. This isdone to obtain extra lead length. In the caseof larger components, clip the leads as closeas possible to the component body.

b. Using long nose pliers, form a loop of thelead ends as shown in figure 21.

c. Thread the leads of the new componentsthrough these loops. Cut off the excess lead,crimp and solder the connection.

3. Permanent Repairs

a. Remove the hardware fastening the board tothe chassis and tilt board up.

b. Isolate the defective component. If it is

necessary to disconnect a component fromthe circuit for test, heat the junction of thecomponent lead and the etched wiring withthe soldering iron. The heat should be con-centrated on the component lead rather thanthe etched wiring pattern. Pry up andstraighten the bent -over portion of the com-ponent lead with a knife blade, then pulllead through the hole with pliers.

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23

c. To remove the defective component, snip theleads off at the component side of the board.See figure 21.

d. Using a small soldering iron (35 watt orless) heat the leads and remove them fromthe printed wiring side of the board. Becareful not to apply too much heat or forceto avoid damage to the thin copper conduc-tors.

e. Clean and preform the leads of the newcomponent and insert through the holesuntil the component body is tight againstthe board.

f. On the circuit side, grasp the componentlead and bend it over in the direction ofthe circuit pattern.

g. Crimp the wire tightly against the board (seefigure 21), and cut off the excess componentlead. Leave about 1/16 inch of wire pro-truding from the edge of the hole.

h. Heat the lead and apply rosin core solder.DO NOT USE PASTE OR ACID FLUX.Remove excess rosin from the joints withalcohol.

i. Replace the circuit board, using the originalhardware.

4. Replacement of Tube Socket

Heat each socket terminal lead and pry upand straighten with knife blade. Pull socket outapplying heat to terminal leads, if necessary.Clean holes free of solder. Prepare new socketfor installation as follows: If tube shield groundstrap (stock #210773) is required, insert strapfrom top of socket in slot provided until firmlyseated. Small ridges on strap must point out-ward. Bend lead terminal of strap radiallyoutward.

Using the old socket as a guide, bendterminal leads at right angles to fit mountingholes provided in board. Insert socket terminalsthrough holes making sure that socket terminalnumbers correspond to the numbers etched onthe board near the tube socket mounting holes.Bend socket terminals radially inward. If neces-sary, clip off excess length to prevent shortcircuit with adjacent conductors. Solderterminals to the etched wiring.

TO REMOVE DEFECTIVE COMPONENT

HEAT 8 PULL OUT HERE

GUT OFF HERE

GUT OFF HERE SOLDER

CONDUCTORSTRIP

TO INSTALL NEW COMPONENT

BEN2PLIERSRE

COMPONENTBOARD

TO REMOVE COMPONENT FROM TOPOF CIRCUIT BOARD

SOLDER PIGTAIL OFNEW COMPONENT TOLOOPED END.

-8901158-1

Figure 21-Replacement of Components inPrinted Circuits

LIST OF PARTS

Symbol DescriptionStockNo.

CONSOLETTE5AR1 to

5AR9

5ARIO,5AR11,5AR12

Preamplifier: circuit board assem-bly complete with 5 capacitors,13 resistors, 2 tube sockets and2 ground straps. (Componentslisted under Preamplifier)

Preamplifier: circuit board assem-bly complete with 5 capacitors,12 resistors, 2 tube sockets and2 ground straps. (Componentslisted under Preamplifier)

210998

210999

Symbol DescriptionStockNo.

5AR13,5AR14

Program Amplifier: circuit boardassembly complete with 6 capaci-tors, 12 resistors and 3 tubesockets. (Components listed underProgram Amplifier) 211000

SARIS,

5AR16

Monitor Amplifier: circuit boardassembly complete with 7 capaci-tors, 13 resistors and 3 tubesockets. (Components listed underMonitor Amplifier) 211001

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Symbol DescriptionStockNo.

5AT1 to5AT5

Resistor: variable, attenuator,100,000 ohm, pot., 20 steps, 2DBper step, last step tapered toinfinity 21 1002

5AT6,5AT7

Resistor: variable, attenuator,100,000 ohm, pot., 20 steps, 2DBper step, last step tapered toinfinity with cue switch 211003

5AT8 to5AT11

Resistor: variable, attenuator,100,000 ohm, pot., 20 steps, 2DBper step, last step tapered toinfinity. Same as 5AT1 211002

5AT12,5AT13

Resistor: variable, composition,100,000 ohm ± 10%, 2 w 209286

5AT14 Resistor: variable, attenuator,15,000/15,000 ohm, dual pot.,20 steps, 2DB per step, last steptapered to infinity 211004

5AT15,5AT16

Fixed Pad: Parts listed underFixed Pads

5AT17,5AT18

Fixed Pad: Parts listed underFixed Pads

5C1 to Capacitor: fixed, paper, 0.47 mf5C3 ± 20%, 200 v 73787

5C4 Not Used5C5 Capacitor: fixed, paper, 2700 mmf

± 10%, 600 v 735995F1, 5F2 Fuse: 3 amp, 125 v, slow -blow type 991645J1, 5J2 Jack: open circuit 534015K1, 5K2, Relay: D.P.D.T. 205255

5K35M1, 5M2 Meter: VU 2052495PS1, 5PS2 Power Supply: Parts listed under

Power SupplySRI to Resistor: fixed, composition, 150

5R5 ohm ±10%, 1/2 w 5021155R6 Resistor: fixed, composition, 4700

ohm ± 10%, 1/2 w 5022475R7 Resistor: fixed, composition, 680

ohm ± 10%, 1/2 w 5021685R8 Resistor: fixed, composition, 560

ohm at 10%, 1/2 w 5021565R9, 5810 Resistor: fixed, composition, 100,000

ohm ±5%, 1/2 w 5024105R11 to Resistor: fixed, composition, 22,000

5R28 ohm ±5%, 1/2 w 5023225R29 Resistor: fixed, composition, 18,000

ohm ±5%, 1/2 w 5023185R30, 5R31 Resistor: fixed, composition, 15,000

ohm ±5%, 1/2 w 5023155R32 Resistor: fixed, composition, 18,000

ohm ±5%, 1/2 w. Same as 5R29 5023185R33 Resistor: fixed, composition, 2000

ohm ± 5%, 1/2 w 5022205R34 Resistor: fixed, composition, 5600

ohm ±5%, 1/2 w 5022565R35 Resistor: fixed, composition, 2700

ohm ±5%, 1/2 w 5022275R36 to Resistor: fixed, composition, 100

5R41 ohm ±5%, 1 w 512110

Symbol DescriptionStorkNo.

5R42 to Resistor: fixed, composition, 5605R44 ohm ± 10%, 1/2 w. Same as 5R8 502156

5R45, 5R46 Resistor: fixed, composition, 27,000ohm ± 5%, 1/2 w 502327

5R47 Resistor: fixed, composition, 2000ohm ±5%, 1/2 w. Same as 5R33 502220

5R48 Resistor: fixed, composition, 5600ohm ± 5%, 1/2 w. Same as 5R34 502256

5R49 Resistor: fixed, composition, 2700ohm ± 5%, 1/2 w, Same as 5R35 502227

5R50 to Resistor: fixed, composition, 100

5R55 ohm ±5%, 1 w. Same as 5R36 5121105R56 to Resistor: fixed, composition, 560

5R58 ohm ±10%, 1/2 w. Same as 5R8 5021565R59 Resistor: fixed, composition, 100,000

ohm ±5%, 1/2 w, Same as 5R9 5024105R60 Resistor: fixed, composition, 27,000

ohm ± 5%, 1/2 w. Same as 5R45 5023275R61, 5R62 Resistor: fixed, composition, 1500

ohm ±5%, 1 w 5122155R63 Resistor: fixed, composition, 820

ohm ±5%, '1/2 w 5021825R64 to Resistor: fixed, wire wound, 15

5R67 ohm ± 10%, 5 w 974415R68 Not Used5R69 to Resistor: fixed, wire wound, 15

5R71 ohm ± 10%, 5 w. Same as 5R64 974415R72 Not Used5R73, 5R74 Resistor: fixed, composition, 4700

ohm ± 10%, 1/2 w. Same as 5R6 5022475R75 Resistor: fixed, composition, 680

ohm ± 10%, 1/2 w. Same as 5R7 5021685R76 to Resistor: fixed, composition, 4700

5R85 ohm ± 10%, 1/2 w, Same as 5R6 5022475R86 Resistor: fixed, composition, 680

ohm ± 10%, 1/2 w, Same as 5R7 5021685R87 Resistor: fixed, composition, 10,000

ohm ± 10%, 1/2 w 5023105R88 Resistor: fixed, composition, 150

ohm ± 10%, 1/2 w, Same as 5111 5021155R89 Resistor: fixed, composition, 10,000

ohm ± 10%, 1/2 w. Same as 5R87 5023105R90, 5R91 Resistor: fixed, composition, 560

ohm ±5% 1/2 w 5021565R92, 5R93 Resistor: fixed, composition, 680

ohm ±10%, 2 w 5221685S1 to 5S5 Switch: key lever, 4 "A", 4 "B"

and 4 "D" type contacts, 2 waylocking 211008

5S6, 5S7 Switch: key lever, 4 "D" typecontacts, 2 way locking 211009

5S8 Switch: rotary, wafer type, 14

circuit, 3 section, 6 position,shorting contacts 211010

5S9 to Switch: key lever, 4 "A", 4 "B"5S13 and 2 "D" type contacts, 2 way

locking 941415514 to Switch: key lever, 2 "D" type con -

5S17 tacts, 2 way locking 941425S18 Switch: push, multiple, 8 plungers,

3 non -locking, 5 interlocking 94440

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Symbol DescriptionStockNo.

5519 Switch: rotary, wafer type, 1 circuit,1 section, 8 position, non -shortingcontacts 211012

5520 Switch: rotary, wafer type, 4

circuit, 4 section, 8 position, non -shorting contacts 211013

5521 Switch: key lever, 2 "A", 4 "B"and 2 "C" type contacts, 2 waylocking 94144

5522 Switch: rotary, wafer type, 3 circuit,1 section, 2 position, shortingcontacts 211014

5523, 5524 Switch: key lever, 2 "A", 6 "B"and 4 "E" type contacts, 2 waylocking 211015

5525 to Switch: toggle, DPDT, 3/6 amp5S28 @ 250/125 v, bat handle 52133

5S29 Switch: toggle, SPST, 3 amp@ 250 v, bat handle 46425

5T1 to 5T9 Transformer: audio, input 2053265T10, 5T11 Transformer: audio, output 2092815T12, 5T13 Transformer: audio, output 2074345TI4 Transformer: audio, input 2110175XF1,

5XF2Holder: fuse 205914

Board: terminal, 46 terminals 211030Board: terminal, 120 terminals 211031Button: push, black 32120Button: push, red 32121Clamp: cable, white nylon, 3/16"

I.D. 209652Clamp: cable, white nylon, 3/8"

I.D. 210391Fastener: receptacle, silicon, bronze 94641Fastener: stud steel, with retaining

ring 96145Grommet: rubber 37396Knob: control, black with white

filled pointer, 2" dia. 17269Knob: control, black with white

filled pointer, 1-7/16" dia. 17268Knob: control, blue with white

filled pointer, 2" dia. 94444Knob: control, red with white filled

pointer, 2" dia. 94446Knob: control, green with white

filled pointer, 2" dia. 96928Knob: key lever switch, blue 94442Knob: key lever switch, green 96929Knob: key lever switch, red 94441Mounting: shock, isolator 211029Oil: attenuator 20752Ring: retaining, fastener 98480Shield: tube, 53/64" I.D. x 1343"

ht., aluminum 211035Support: fall, single link, 61/4" lg.

with 51/2" slot 94647

PREAMPLIFIERS

1C1 Capacitor: fixed, paper, 0.047 mf± 10%, 400 v 73553

Symbol DescriptionStockNo,

1C2

1C3, tC4

Capacitor: fixed, paper, 0,1 mf± 10%, 400 v

Capacitor: fixed, paper, 0.047 mf73551

±10%, 400 v. Same as 10. 73553105 Capacitor: fixed, paper, 1.0 mf

± 10%, 200 v 2080771R1 Resistor: fixed, composition, 8200

ohm ±5%, 1 w 5122821R2 Resistor: fixed, composition, 100,000

ohm :1--10%, 1/2 w 5024101R3 Resistor: fixed, composition, 1

megohm ± 10%, 1/2 w 5025101R4 Resistor: fixed, composition, 560

ohm ± 10%, 1/2 w 5021561R5 Resistor: fixed, composition, 160,000

ohm ±5%, 1/2 w 5024161R6 Resistor: fixed, composition, 39,000

ohm ± 10%, 1/2 w 5023391R7 Resistor: fixed, composition, 5600

ohm ±5%, 1 w 5122561R8 Resistor: fixed, composition, 200,000

ohm at 5%, 1/2 w 5024201R9 Resistor: fixed, composition, I

megohm ± 10%, 1/2 w. Same as1R3 502510

1R10 Resistor: fixed, composition, 91,000ohm ±5%, 1 w 512391

IR11 Resistor: fixed, composition, 100,000ohm ±10%, 1/2 w, Same as 1R2 502410

1R12 Resistor: fixed, composition, 9100ohm ±5%, 1/2 w 30671

1R13 Resistor: fixed, composition, 300,000ohm ± 5%, 1/2 w 502430

1R14 Resistor: fixed, composition, 56,000ohm ± 10%, 1/2 w 502356

IRIS Resistor: fixed, composition, 1200ohm -±- 10%, 1/2 w 502212

IXV1, Socket: tube, 9 contact miniature 2092841XV2

Strap: ground, for miniature tubesocket 210773

PROGRAM AMPLIFIER

2C1 Capacitor: fixed, paper, 0.047 mf±10%, 400 v 73553

2C2 Capacitor: fixed, mica, 39 mmf-S-10%, 500 v 39618

2C3, 2C4 Capacitor: fixed, paper, 0.047 mf±10%, 400 v. Same as 20 73553

2C5 Capacitor: electrolytic 20 mf-10 +50%, 450 v 99149

2C6 Capacitor: fixed, paper, 0.047 mf± 10%, 400 v. Same as 2C1 73553

2R1 Resistor: fixed, composition, 100,000ohm ± 10%, 1/2 w 502410

2R2 Resistor: fixed, composition, 1800ohm ±5%, I/2 w 502218

2R3 Resistor: fixed, composition, 150,000ohm ± 10%, IA w 502415

2R4 Resistor: fixed, composition, 680,000ohm ± 10%, 1/2 w 502468

Page 31: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

26

Symbol DescriptionStockNo.

2R5 Resistor: fixed, composition, 2700ohm ± 10%, 1/2 w 502227

2R6, 2R7 Resistor: fixed, composition, 120,000ohm -1.-5%, 1/2 w 502412

2RB, 2R9 Resistor: fixed, composition, 470,000ohm ± 5%, 1/2 w 502447

2R10 Resistor: fixed, composition, 390ohm ± 5%, 1/2 w 30498

2R11 Resistor: fixed, composition, 10,000ohm ± 10%, 1/2 w 502310

2R12 Resistor: fixed, composition, 18,000ohm ±; 5%, 1/2 w 502318

2XV1, Socket: tube, 9 contact miniature 2092842XV2,2XV3

MONITOR AMPLIFIER

3C1 Capacitor: fixed, paper, 0.047 mf± 10%, 400 v 73553

3C2 Capacitor: fixed, mica, 82 mmf± 10%, 500 v 39626

3C3, 3C4 Capacitor: fixed, paper, 0.047 mf±-10%, 400 v. Same as 3C1 73553

3C5 Capacitor: fixed, mica, 82 mmf=1=10%, 500 v. Same as 3C5 39626

3C6 Capacitor: electrolytic, 25 mf-10 +250%, 25 v 52518

3C7 Capacitor: electrolytic, 20 mf-10 +50%, 450 v 99149

3R1 Resistor: fixed, composition, 100,000ohm -±- 10%, 1/2 w 502410

3R2 Resistor: fixed, composition, 2200ohm ±5%, 1/2 w 502222

3R3 Resistor: fixed, composition, 220,000ohm ±10%, 1/2 w 502422

3R4 Resistor: fixed, composition, 1

megohm ± 10%, 1/2 w 5025103R5 Resistor: fixed, composition, 1500

ohm ± 10%, 1/2 w 5022153R6, 3R7 Resistor: fixed, composition, 39,000

ohm ±5%, 1/2 w 5023393R8, 3R9 Resistor: fixed, composition, 470,000

ohm ± 10%, 1/2 w 5024473R10, 3R11 Resistor: fixed, composition, 430

ohm ±5%, 2 w 5221433R12 Resistor: fixed, composition, 6800

ohm ± 10%, 1/2 w 5022683R13 Resistor: fixed, composition, 22,000

ohm ±5%, 1/2 w 5023223XV1 Socket: tube, 9 contact miniature 2092843XV2, Socket: tube, octal 207707

3XV3

FIXED PADS SAT15, SAT16

R1, R2 Resistor: fixed, composition, 270R3, R4 ohm ±5%, 1 w 512127

R5, R6 Resistor: fixed, composition, 18 ohm±5%, 1 w 59486

Board: circuit, etched, with 6

terminals 211018

Symbol DescriptionStockNo.

FIXED PADS 5AT17, SAT18RI, R2 Resistor: fixed, composition, 4700

ohm ±5%, 1 w 512247R3 Resistor: fixed, composition, 620

ohm ±5%, 1 w 59488Board: circuit, etched, with 6

terminals 211018

POWER SUPPLY4C1A, B, C Capacitor: electrolytic, 40/40/40

r4C2A, B, C mf -10 +50%, 450 v 2110224C3 Capacitor: fixed, paper, 0.47 mf

Jr 10%, 200 v 737874C4A, B, C Capacitor: electrolytic, 40/40/404C5A,B, C mf -10 +50%, 450 v. Same as

-4C6A, B, C 4C1A, B, C 2110224C7 XL4--t Capacitor: electrolytic, 10 mf

-10 +50%, 450 v 913914C8 Capacitor: electrolytic, 80 mf

-10 +50%, 450 v 2061084C9 Capacitor: electrolytic, 500 mf

-10 +250%, 50 v 996564C10 iam Capacitor: electrolytic, 10 mf

-10 +50%, 450 v. Same as 4C7 913914CR1 Rectifier: selenium 2110234R1A, B Resistor: tapped, wire wound,

100/3000 ohm ±10%, 7.6/5.4 w 2110244R2 Resistor fixed, wire wound, 750

ohm ± 10%, 10 w 2110254R3 Resistor: fixed, composition, 120,000

ohm ± 10%, 1 w 5124124R4 Resistor: fixed, composition, 18,000

ohm ± 10%, 1 w 5123184R5A,

B, C, DResistor: tapped, wire wound,

1000/600/600/600 ohm ± 10%,1.0/1.5/1.5/1.5 w 211026

4R6 Resistor: fixed, composition, 3900ohm ± 10%, 1 w 512239

4R7A, B Resistor: tapped, wire wound,10,000/1500 ohm ±10%, 6/4 w 211027

4R8 Resistor: fixed, composition, 120,000ohm ± 10%, 1 w. Same as 4R3 512412

4R9 Resistor: variable, composition, 500ohm 7.1-- 20%, 1/4 w 206037

4R 10 Resistor: fixed, composition, 10 ohm± 10%, 1 w 512010

4R11 Resistor: fixed, composition, 2200ohm ± 10%, 1 w 512222

4R12 Resistor: fixed, composition, 5600ohm ±10%, 1 w 512256

4R13 Resistor: fixed, composition, 12,000ohm ± 10%, 1 w 512312

4R14 Resistor: fixed, composition, 5600ohm ± 10%, 1 w. Same as 4R12 512256

4R15 Resistor: fixed, composition, 12,000ohm ± 10%, 1 w. Same as 4R13 512312

4T1 Transformer: power 2110284XV1 Socket: tube, octal 685904XV2 Socket: tube, 7 contact miniature 94925

Plate: mounting, electrolytic capaci-tor 18469

Page 32: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

TWO -STUDIO SPEAKER AND WARNING LIGHT OPERATION

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Page 33: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

29-30

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Page 34: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

31-32

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Figure 23-Control Circuits

Page 35: Type BC-6A Dual Channel Consolette · RCA Bldg., 1560 N. Vine St. Hollywood 9-2154 Branch-San Francisco 2, Calif. 420 Taylor St. Ordway 3-3027 Atlanta 3, Georgia 522 Forsyth Bldg

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