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BOGEN MODEL.RP6O FM-AM MULTIPTEX RECEIVER

DESCRIPTION
The Bogen Model RP60 is a compactly designed highfidelity stereophonic FM-AM Multiplex receiver combining a radiation-proof superheterodyne tuner, dual preamplifier, and

two 30 watt power amplifiers on a single chassis. The versatile unit also provides for the amplification of sterophonic audio signals from a tape recorder, phonograph or one .auxiliary high level signal source. The RP6O incorporates the following features: Built-in Multiplex-to receive FM stereo programs via the Multiplex system approved by the FCC in April 1961. Completely self-contained. . .no extra chassis, interconnecting cables; wiring. Full band-width provides full frequency response, extremely lorry di-c161[9n and maximum
separation between right and left channels.

amplified RF amplifier, wide-band tuned IF amplifier with dual limiting action, and ratio detector arranged to ptovide automatic interstation hush. AFC with "IN-OUT'' switch is provided to maintain optimum fidelity as station transmission characteristics change. An AGC circuit maintains

Scrotclr ond Rumble Filters-can be used for mono or stereo and regardless of whether one or two program sources are being used.

Loudness Compensofor-preserves aural musical balance at low volume levels. Can be used for mono or steteo and regardless of whether one or two pcogram sources are
being used.

. . . stereo,.steteo with channels reversed, left channel or
right channel input fed to both speaker systems. Thid Channel Outpul-f.or use with 3-speaker stereo
arrangement or to operate an additional remote system.

l{ode Selecror-to select the desitqd mode of operation

changes. A guick-acting electronic indicator provides visual assurance of tuning precision and convenience. Iope Recorder operofion RP60 has an input sensitivity sufficient to allow the connection of tape recorder heads (of a tape deck) directly to the tape inputs. Also tape outputs are provided which are of the cathode follower, low impedance type. Pre-amplifier section features an input sensitivity for even the lowest output phono cartridges to be sufficient to drive the amplifier to a power output of,30 watts per channel, more than enough to &ive even the lowest efficiency speakers. Frequency response is 18 to 30,000 cycles (t1db) with distortion held to 0.8% at full rated output. Pure DC current is used on all preamplifiet tubes to guarantee absolute freedom from hum.

from distortion blaring or fade-out due to station signal

an FM audio output level of 10.5 db with a range of signal varaition greater than 10 to 10O,000 pv. This insures freedom

Extra-heavy duty, special "pertnafiltt treated power transformer, oversized and conservatively employed parts and Bogents traditionally strict quality control procedures

The F*l ,uner circuitry features a fully tuned

and

insure trouble-free operation and life-long retention of
original performance specifications.

SPECIFICATIONS
OUTPUT POWER: 30 watts, per channel - 60 watts combined*
FREQUENCY RESPONSE: 20 to 20,000 cvcles, t1db. DISTORTION: less than 0.6% at tull output
HUM & NOISE LEVEL:-60 db Mag. and Tape 75 db Au:c and Tuner FM SENSITIVITY: 0.85 for 20 db quieting; IHFM 2.Spv AM LOOP SENSITIVITYt 75 tw per meter for 20 db quieting

AUDIO SENSITIVITY: Magnetic Cartridge 4.5mv Tape Head 4.5mv Crystal Cartridge 0,5v Auxiliary 0.5v SPEAKER OUTPUT: 4, 8 and 16 ohms ACCESSORIES: Metal Enclosure-Model EN-7
Wood

CONTROLS: Programing

Cabinet -Model WE-7 Selector; Mode Selectorl Volume; Balancel Separate coax Bass and Treble; LO Filter; HI Stereo-FM Filter; Loudness; Tape Monito!; Speaker Output switch; Power; Tuning; AFC.

ANTENNAS: FM-Built-in AC

line and external connection for balanced 300f,) or 75O coaxial
external antenna. AM-Built-in loopstick and external connection for high impedance outdoor antenna.

TUBE COMPLEMENT: 20 tubes; 8 crystal diodes (including 3 matched pairs) and 7 rectifiers; total of 34
tube functions. DIMENSIONS: 15-15/16"w.

x5-l/4"h. x lS"deep

MULTIPLEX: Time division type with "Stereo-mindertt indicator.

SHIPPING WEIGHT: 35 lbs.

*Measured in accordance with I.H.F.M. Standards.

-t -

INSTALTATION
UNPACKING

Inspect shipping coritainer and unit for indications of improper handling. The unit was carefully checked before leaving factory. If unit has been damaged, make an immediate claim to dealer or distributor from whom it was purchased. If unit was shipped to you, notify transportation company without delay and place your claim.
CONN ECTIONS BETWEEN COMPON ENTS
, Use single-conductor, low-capacity shielded wire for connecting the record player, tape recorder, and other components (except speakers) to the RP60. Keep leads under ten feet in length.

This conoection is adequate for normal or strong signal areas. For interference-free reception, the line cord should be c.ompletely unwound and left to hang freely as far as
possible from metallic objects.
folded dipole antenna as shown
STANDARD

\

For weak signal areas, conflect an extemal in figure 2.
3OO^
FOLDED DIPOLE ANTENNA

30Gohm

cord ("zip cordtt) and up to 1O0 feet of cable may be used without appreciable loss. Make certain that al1 audio cables ate kept away from speaker cables, power cables, and power transformers, and that speaker cables are kept away from power cables.
GROUNDING THE UNIT

Speakers may be connected

with standard flexible line

EXTERNAL

ANTENNA TERMINAL

Figure 2

Ground the receiver by attaching a wire from a GND terminal on the chassis rear to a good ground. such as the metal frame of the wall outlet or a water or steam pipe. Do not use the antenna ground terminal for this purpose.
POWER

- Connection o{ externol 3000 FM ontenno. If, in addition to being in a weak signal area, there is considerable interference from man-made noises such as cat ignition or electrical machinery, a coaxial 75-ohm cable
RG-59/Umay be used with a simple dipole or a more complex antenna. In such an installation, connect the outer shield of the cable to the ground lug of the antenna terminal post (figure 3) and the center conductor to either of the terminals

marked 300 ohms.

Connect the line cord to a wall outlet supplying 117-volt AC, 60-cycle power.

1

AUXILIARY POWER RECEPTACLES
One AC receptacle has been included at the rear of the chassis (refer to figure 5) for the supply of power to a phonograph. The PHONO receptacle is nol controlled by the power switch and phonographs connected to this receptacle must be tumed on and off separately. (l|'his will ptevent the phono idlet wheel from developinE flafs which miQht occur if the atnplifier controlled powet to the phonoprcph and the ampli' fiet was tumed oft before the phonopraph was disengaged.)

TERMINAL

ANTENNA INPUTS
The RP60 is provided with built-in FM and AM antennas Outdoor antennas are recommended in weak signal areas. If outdoor antennas are used, they should be mounted away from electriCal devices and at a distance from latge metallic objects to insure satisfactory reception.

Connection of cxfernol 75O FM onfenno. AM ANTENNAS: A high-Q ferrite loopstick antenna is located on the chassis for receiving normal or strong AM signals. No connections are necessary for AM reception, using this antenna. For weak signal areas, use a standard "flat-toptt outdoor antenna connected to the AM terminal as shown in figure

Figure 3

-

4.

FM ANTENNAS: The RP-60 is shipped from the factory with the FM line antenna connected to one of the 300-ohm lugs of the insulated antenna terminal strip (see figure 1).
INSULATED

\
FM INTERNAL
ANTENNA LEAD
74-O3a2A

ANTENNA TERMINAL

EXTERNAL ANTENNA TERMII{A

Figuie

I-

Conneciion o{ FM line onfenno.

Figure 4

-

Connection of exiernol AM ontenno.

-2-

ANTENNA INPUT TERMINALS

TAPE OUTPUT

ax-coNrlcr

As slo*N
SHOWil

FT-CONNECT AS

rx FtGUits t.2lro!

{iEE.

n-

! uP (rusE,

PHONO PWR RECPI COITECT POWR PLU6

iOT CONTFOILED BY i?60 PotaR swlrcH ITO PNOTECI PHONO

Figure 5

-

Reor of chossis of RP50.
microphone (high output, high impedance tyPe) or other high-

HOW TO CONNECT PROGRAfiI INPUTS
stereo or monophonic inputs from phonographs having magnetic, ceramic, or crystal cartridges.
PHONOGRAPH:

level
been

sources'
to

Facilities have

provided for

both AUX iacks,' for monophonic p/ograms, connect the pro' Eram source to the left or ri$ht channel jack.

NOTE: For sfereo, the program source must be connected

l. MAGNETIC CARTRIDGE: Connect the outputs of the phonograph to the two input jacks marked MAG. PHONO
(Refer to figure 5)

HOW TO CONNECT OUTPUTS
SPEAKERST Two separate speaker svstems can be connected to the RP-60.

2.

phonograph

CERAMIC CARTRIDGE: Connect the outputs of the to the two input jacks marked AUX. (Refer

to figure 5)

3. CRYSTAL CARTRIDGE: Connect the outputs of the phonograph to the two input jacks marked AUX. (Refer
to figure 5)

For besf steteo reproduction, it js sulElesfed that the two speaker sysfems be sintilar. Try placemenl of speakers in difterent ,locafions for the most effective resul/s. Recenf experiments have indicated that when both speakers are placed against /fte same flat wa|l, the area of stereo covet-

and connect the phonoQraph output to that jack. For monogjhonic listeninQ with a stereo cartridee, connect both phonoQraph outtTrts to the propet pait of iacks as explained above, One of the most frequent causes of phonograph hum can be traced to the incorrect interconnection of the pickup car-

NOTE: For monophonic listening (with a monophonic car tridge), select the left or tiQ,ht channel iack which cotte' spbnds to the type of catttidpe beinp used in your playet and

encountered in an installation and disappears when the phono plug is disconnected from the amplifier input receptacle, it is likely that the hum is due to 60-cycle AC current through the phono cable shield' This can be overcome by connecting tlte chassis of the phonograph to the amplifier's ground. iiiake certain that the phonograph cable shield is not connected electrically to the chassis of the phonograph.
program material, plug the outputs of the stereo playback head of your tape deck into the two input jacks marked TAPE I{D, on the rear of the amplifierts chassis (refer to figure 5) If your tape recorder is self-contained (that is' if it has its own playback anrplifibr), connect the playback head outputs to the two jacks marked AUX.
T

tridge, the phono tumtable, and the amplifier. When hum is

age is ereater than it they are placed in corners' Separafe speakers by at least five feet. /n mosf cases, the progtam will sound besl jf you are located about midway between the speakers at about twice the dislance between /he speakers (e.8., it ffte speakers are 6 feet apart, you should be approx' imately 12 feet away ftom them), Connect the speaker leads of the left and right channel speakers to the respective pair of terminals marked SPKR. Check the speaker system impedance (4, 8 or 16 ohms). Connect the spade lugs of the pig tail leads, on the chassis rear, to the correct left and right channel terminals (refer to figure 5).

3RD CHANNEL: If you now own a monophonic high fidelity amplifier-speaker system, you may use it, together
with your new stereo system, to provide a third channel and further enhance the effect of stereophonic sound. This third channel sound blends with the sound of the two regular stereo channels to add more body and presence to stereo' To set-up the third channel proceed as follows:

AP

E RECORDER: Vlhen plaving back

prerecorded

1, Insert input cable jack from your monophonic amplifier into jack, marked 3RD CHANNEL OUTPUT on top of RP 60 (refer to figure 7). 2. Place monophonic speaker between the stereo speakels. 3. Adjust volume control on monophonic amplifier to provide a balance between the three speaker outputs.

NOTE: Use the left or ieht channel TAPE input iack fot
.monophonic plaYback.

AUXILIARY: The jacks marked AUX are for input connections from a tape recorder with a built-in preamplifier, from the sound section of a TV receiver, from a crystal

TAPE OUTPUT: For recording stereo programs, con' nect the input to the stereo tape recorder to the two jacks marked TAPE MONITOR. Do not connect a recording device that has an impedance of less than 100,000 ohms to these
jacks.

-3-

OPERATION
HOW CONTROTS FUNCTION
POWER

Turn POWER switch on Allow unit to warm
PROGRAMING SELECTOR

uD.

amplifier outputs are reversed, The left channel signal will be heard from the right channel speaker system, while the right channel signal will be heard from the left channel
speaker system. Therefore,

-.

if the

sound directions appear to

This control is used to select the desired

program

source. The control has the following positions: AM-Used to select the AM program input from the AM tuner section. FM ST-Used to select the multiplex progrun signal when a stereo FM-Multiplex program is being transmitted. FM-Used to select the FM program input from the FM tuner section. AUX-Used to select the program signal source connected to the AUX Input as described under Installation. PHONO-Used to select the program sign.al source from a phonograph employing a magnetic type cartridge when connected as described under Installation. TAPE HD-Used to select the program signal source from a tape recorder (direct from the tape recorder playback heads) when connected as described under Installation.
MODE

be wrong (e.g. if violins appear to be on the wrong side of orchestra) the directions of the sound may be reversed by switching between the STER NORM and STER REV positions.
MONO L-lN ond MONO R-lN: In the MONO L-lN position the program source connected to the left channel input will be heard from both speaker systems. In the MONO R-lN position the program source connected to the right channel input will be heard from both speaker systems,

VOLUME AND BALANCE CONTROLS
TTre volume control of the RP60 controls the level of both channels. Clockwise rotation increases the volume

Used to select the desired mode of operation. . .stereo, stereo with channels reversed, left channel or right channel input fed to both speaker systems. The functions of the four positions are as follows:

level of both channelsl counterclockwise rotation decreases the volume level. Rotate the VOLUME control until a satisfactory listening level is obtained. The BALANCE control controls the level of each channe1 separately. By turning this control from its normal center position to the left, the volume from the left channel speaker will be decreased while the volume from the right channel speaker will remain constant. Rotation of this control to the right of center will decrease the volume of the right channel speaker, while volume from the left channel soeaker will
remain constant,

STER NORM ond STER REV - Used when listening to a stereo program source. In the STER NORM position the left channel signal will be heard from the left channel speaker system and the right channel signal will be heard from the right channel speaker system. In the STER REV position the

After adjusting the VOLUME control for an approximate listening level, adjust the BALANCE control for an exact
balance between the two speakers. After the desired balance is obtained the volume may be increased without affecting the balance,

ar

AM-FM DIAL
INDIqATOR TAPE
MONITOR
POWER

TER

AM-FM
TUNING INDICATOR

Hl-

rER

ON -

OFF

AM-FM
TUNING CONTROL

SPEAKER OUTPUT

PROGRAM SELECTOR TONE
CONTROLS

STEREO PHONES JACK

MODE

VOLUME

-

SELECTOR

Figure 5

-

Model RP60 Controls

-4-

BASS AND

TREBLE

r-

Four separate and independent controls have been provided for accurate setting of the trnal balance of each channel. The bass and treble controls for each channel are arranged coaxially. The front knob is used for treble adjustment while the rear knob is used for bass adjustment'
or noirnal low-frequency response. Clockwise rotation ( '\ ) from the mid-positibn increases the bass response; counterclockwise rotation ( /\ ) decreases the bass resPonse.

VOLUME controls are set for low loudness level listening and the reproduction seems to lack bass response move the LOUNDESS switch to the IN position. At all other times'

when the VOLUME controls are increased to provide

a

loudness level at or near concert level, move the LOUDNESS switch to the OUT position.

AFC

SWTTCH

BA55: The mid-position of this control provides "flattt

AFC (Automatic Frequency Control) is incorporated in

station cliaracteristics change. Maximum fidelity and positive drift free performance are insured when the switch is in the IN position. The use of this control is discussed under ttTuner Operation".

the RP60 to provide optimum Bandwidth as the program and

response; counterclockwise rotation ( t't position decreases the treble response.
SPEAKER OUTPUT SWITCH

TREBLE: The mid-position of this control provides "flat" or normal higlr frequency response. Clockwise rotation ( I ) from the mid-position increases the treble

) from the mid-

under t tTuner Operationt'.

rUN'NG CONTROL The TUNING control is used to select the desired AM or FM station, The operation of this control is discussed
TUNER OPERATION AM
TTONO P

it is desired to listen to stereo phones, plug the phones into the phone jack, located on the right of the front panel'
When

This switch is used for listening to stereo phones only.

HON'C RECEP T'ON

and place the OUTPUT switch in PHONES position'

TAPE MONTTOR SWITCH

,l,tPORfANf: This switch must be in the OUT position when the RP60 is not used for taPe monitoring.
as a signal source for your tape recorder and at the same time as a monitor power amplifier. When used with a tape recorder having a monitor feature (afl high quality tape recorders are capable of monitoring directly from the tape
while recording) the signal, which has been recorded on the tape, can be picked-up by the playback head md heard through the RP60 during the recording operation' This permits the user to adjust the contlols affecting recording for optimum characteristics and correct his settings as the recording is being made. This is the system used by professional recording engineers.

1. Place the PROGRAM SELECTOR control in AM position. 2. Rotate the TUNING control until the dial pointer is in the vicinity of the stationts frequency. Continue to rotate control slowly back and forth until the TUNING INDICATOR is at maximum closing (narrows to a thin band). Station is now preciselY tuned.
FM MONOFHON'C RECEPT'ON 1, Place the PROGRAM SELECTOR control in the FM oosition. Place the MODE selector switch in the MONO L-IN position (or MONO R-IN position). 2. Move the AFC switch to the OUT position 3. Rotate the TUNING control until the dial pointer is in the vicinity of the station's frequency. Continue to rotate the TUNING control back and forth until the TUNING INDICATOR is at maximum closing (narrows to a thin band). Station is now precisely tuned. 4. Move AFC Switch to IN position to "lock" station on
proper frequency.
FA,t

This switch permits the RP60 to be used simultaneously

r

Hl ond L0 FILTER

SWITCHES

STEREO IAULTIPLEX RECEPT'ON
NORM position.

Hl FILTER: Used to reduce high frequency noise level (e.g. noise due to a scratched or wom phono record)' Fot normal reproduction leave switch in NORM position. When it
is'desired to remove high frequency noise (frequencies above 4,000 cycles) move th HI FILTER switch to the CUT
positiorI.

1. Rotate the PROGRAM SELECTOR switch to the FM ST position. Place the MODE Selector switch in the STER 2. Move the AFC switch to the OUT positiorl 3. Rotate the TUNING control until the dial pointer is in the vicinity of the stationts frequency. Continue to rotate the TUNING control back and forth until the TUNING INDICATOR is at maximum closing (narrows to a thin band). Station is now precisely tuned. 4. Move AFC switch to IN position to t'lock" station on 5.
frequency. When the STEREO MINDER indicator

LO FILTER: Used to reduce 1ow frequency noise level (e.g. record changer rumble-motor vibration in phono mechanism). For nomal reproduction leave switch in NORM position. When it is desired to remove low frequency noise (frequencies below 100 cycles) move the LO FII-TER switch to the CUT position.
LOUDNESS SWITCH: When the volume control is used to reduce sound level, low frequencies seem to drop out. This apparent lack of bass at a low sound level is caused by a normal characteristic of the ear which makes it less sensitive to changes in loudness at low frequencies than at high frequencies' In a home system, however, you normally would not want to listen to music at "concett level.tt But you still would want to maintain tonal balance constant between high and low frequencies. The loudness switch does precisely that. Use this switch, then, when listening con-

is lit' the selected

station is transmitting in stereo'

MINDER indicator may flash on and off. This is due to inter-station noise and is not a malfunction. Once a station is correctly tuned, and the tuning indicator is at maximum closing, the STEREO I\,{INDER will stay on only if the station is broadcasting stereo.
PHONOGRAPH OPERATION AlONOPHON' C REPRODUCT'ON

While tuning across the FM dial scale, the STEREO

1.

Select the PHONO (for magnetic cartridge) or AUX (for

ditions'change after you have achieved balance between your speakers with your volume controls. Therefore, when the

ceramic

or crystal type

cartridges) position with the

PROGRAIvI SELECTOR control.

-5-

2. Set MODE control to
tion.

MONO

L-IN (or

MONO R-IN) posi'

TAPE OPERATION
,I,tONOPHON,C REP RODUCftON

3. Set VOLUME, BASS, TREBLE controls and FILTER switches to provide the desired loudness and tonal
balance.
STEREOPHONI C REPRODUCT'ON

1. Select the TAPE HD position with the PROGRAM SELECTOR control. 2. Set MODE control to MONO L-IN (or MONO R-IN) position. Set VOLUME, BASS, TREBLE controls and filter switches to provide the desired loudness and tonal balance.
STEREOPHON'C REPROD U CT I ON

^

(when using stereo cartridge)

1. Select the PHONO position (for magnetic cartridge)'
or AUX position (for cetamic crystal type cartridges)'
with the PROGRAM SELECTOR control.

2, Set the MODE control to STEREO NORM position. 3. Adjust VOLUME, BALANCE, BASS, TREBLE controls and filter switches to provide balanced output at desired
loudness level and tonal balance.

1. Select the TAPE HD position with the PROGRAM

SE-

4, If it is desired to reverse

sound direction place the MODE control in the STER REV position.

LECTOR control. 2. Set the MODE control to STEREO NORM position. 3. Set remaining controls as described above in steps 3 and 4 of Phono Stereophonic Reproduction.

SERVICE
TUBE REPLACEMENT Tubes should be tested at least once every six months insure optimum high-fidelity performance. To avoid possibility of shock, do not remove bottom plate when replacing tubes. Handle tubes by their bases only when removing or inserting them.
second fuse blows, do not attempt to further operate equipment. Consult an experienced technician or Bogen represent-

fuse. Use only 3 amp. slow-blow fuse for replacement. If
ative for inspection of unit' REPLACEMENT OF AM FERRITE LOOP ANTENNA In event AM ferrite loop antenna is replaced for any reason, check alignment as follows: 1. Connect DC VTVM at "Btt (see schematic) and check alignment of AM RF oscillator in accordance with charL 2. Set signal generator to 6OO KC and tune receiver to

DIAL LIGHT
The dial lights are 50,000-hour GE Number 12 lamps and should not require replacement during life or receiver.
FUSE REPLACEMENT

A three-ampere slow-blow fuse is located on rea! of chassis (refer to figure 5). To replace, press spring-loaded cap inward, rotate counterclockwise and withdraw cap and

point where maximum DC voltage is obtained. 3. Seal loopstick in position by applying drop of Duco or other suitable cement to bind coil with respect to bracket. 4. Adjust AM RF trimmer at 1500 KC in accordance with
chart.

signal. Adjust loopstick by sliding coil in bracket to

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)

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LEAA SEGLIR IXC. 80GEN CONIUflICA]IONS DIV

"9
Top View of Chossis

Figure 7

-6-

r

Figurc 8

-

Diol Stringing Procedure
FM ALIGNMENT PROCEDURE

BALANC'NG OUTPUT TUBES If any of the audio power output tubes are replaced, the BAL ADJ controls (refer to figure 7) should be reset as described in the following procedures. Procedure #1, re-

When using the FM Alignment procedure below,

quiring a distortion analyzet provides the most precise

?

connect the signal to the channel being balanced. Adjust the VOLUME control (for channel) and generator output to provide approximately 15 watti amplifier output. Rotate the MODE control to STEREO NORM position. Adjust the BAL ADJ control (for channel) to provide a minimum distortion reading on the distortion analyzer. Procedure #2 - Remove the speaker connections for channel to be balanced and connect a VTVM, capable of reading 0.001 Volt AC, from terminal #4 to ground. Set VOLUME control (for channel) to minimum and rotate I\IODE control to STEREO NORM position. Adjust BAL ADJ control (for channel) to provide a minimum reading on the VTVM.
BAND & DIAL SETTING
AM lzl0OKC

adjustment for minimum distortion" Procedure #2, should be used if only a VTVM is available. If no test instruments are available then set controls to their center positions. Procedure #l - Remove the speaker connections for the channel to be balanced and connect a 4 ohm, 30 Watt resistor from terminal #2 to ground. Connect a distortion analyzer in parallel with resistor. Connect an audio generator to the AUX input and set the PROGRAM SELE,CTOR control to

recommended that eithet Measurements Model ZgFM or Boonton Type 2Q2 or equivalent signal generators be employed. Adjustment points are labelled on chassis as FM RF TRIMM,

it is

AM RF TRIMM, AM OSC TRIMM, etc. Use an insulated
screwdriver for

all adjustments.

DIAL CORD RESTRINGING
Connect dial cords at points START as shown in figure

8. Restringing as indicated; be sure that sufficient pressure from spring at FINISH is maintained in order to prevent

slipping.

. SIG GEN

FM

TUNER ANT

TERM ELOCK

Figure 9
POINT VTVM

-

FM olignment generqtor connections.

STEP

GENERATOR FREQUENCY
455KC
30% Mod

SIGNAL INPUT POINT 6BE6 pin #7 thru .Olmf AM ant term AM ant term

INDICATOR & CONNECTION
ADJUSTMENT AM

z trt = -9 (
=

I

Point ..ct,
(see schem)
Same

for max outDut
AM osc

IF transformers

2

AM

600Kc
30% Mod

coil, loopstick

60oKc
J

transformer for max output
Same

and RF

AM 1400KC FM

140oKC
3@o Mod

AM osc, AM ant. and RF trimmers for max output; check tracking by repeating steps 2 and 3.

I
z,

10.7MC

t30oKc deviation
FM 104MC 104MC

l2AT7 pin #2 thru .01mf
FM ant term (see fig 9)
Same

Oscilloscope

Point "Bt'

FM IF transformers for max gain and symmetry FM osc and RF amp trimmers for max output (set AFC Control to

(see schem)
Same

z = I
3

lr|

2

130oKc deviation
90MC

'IAFC OUT" position).
Oscilloscope

FM
9oMC

=
1tr
4

t30oKC

deviation
FM
9oMC 90MC
Same

Point "E}"

(see schem) Oscilloscope

Check tracking (AFC shorted, see step 2) and adjust FM osc and RF coils if necessary, Check discriminator for balanced "Stt pattem and max ampl (AFC shorted, see step 2).

r300Kc deviation
sIuQ

Point "A"

(see schem)

NOTE: In sfep I above, top

of 3rd AM IF can sftould be sef af exkeme countetclockwise posifion.

-7 -

Itr

a
t2

to 9

I

5 4 5

3

4

5

7

I

9

to

tl

t2 t5 l4

IC

s(or-2)

II

(or-2)

3

4 5

t234567
Figure I0

89lO tO9 - PAC Units
and

5

2

|

MULTIPLEX SECTION ADJUSTMENT Your receiver was precisely aligned at the factory with the best available test equipment (no service shop can attain the same exacting standards). Bogen therefore does not recommend alignment by anyone other than a factory authorized service station. However, in some instances it may be

If distoition occurs during FM multiplex transmission is not present during monaural transmission it is due to trouble at the transmitter or in the antenna system (reflections, etc. )

It is considered very unlikely that a complete alignment will ever be required. This should be attempted only by a
mended:

necessary to "touch-uptt the multiplex section to meet differences between stations or slight misadjustment due to
extreme shock incurred in shipment.

thoroughly experienced serviceman possessing good equipment. The following equipment, or its equivalent is recomScott I\{odel 830 Multiplex Generator Boonton Model 202E RF Signal Generator Hewlett-Packard Model 202C Audio Oscillator

the adjustments given in steps 1 and 2 below to eliminate
mitting background music over second multiplex sub-carrien

If

a

whistling or tweet type interference occurs' perform

the disturbance, This disturbance is due to station transIf this adjustment does not eliminate the interference, check that the station is precisely tuned-in, that the FM antenna is correctly oriented (try re-positioning), that a mismatch does
not exist between antenna and receiver (try reversing leads)' or if a better and more directional antenna is required.

Before attempting the complete alignment procedure, be sure to carefully read and thoroughly understand the multi' plex generator instruction manual. Interconnect equipment

as described in manual. Be sure generator is properly calibrated and all equipment is matched in regard to levels and impedances (and that signals are free from distortion). Be sure that alignment area is free from interference.

\

MULTIPLEX ALIGNMENT CHART
STEP
I

ALIGN
67KC

GENERATOR 67KC-Audio

SIGNAL INPUT POINT

INDICATOR, TEST POINT

ADJUSTMENT

v9

L2AV7
2

TRAP

Oscillator

Pin

Approx. 0.5V

Level
76KC TRAP
19KC AMP

junction of Trap "A"
and t'Btt
1

VTVM at

Trap "Att min.

76KC-Audio

Same as Step

Same as Step

1

Trap "Bt' min.
Tune T10 for max. Top of T11 for min.

Oscillator
98MC FM

signal
modulated 10% by Stereo

Ant, Terminals 1000 pv Level

Pin 8 of Vl0
6BL8

VTVM at

Pilot Signal
4

Gen. with

38KC

Same as

Same as Step 3

Doubler

Step 3

junction of
IN542 diodes and T9

VTVM at

Tune T9 for max.

(

1gKC

98MC FM

Same

as Step 3

Scope at left

Oscillator
Phase

signal
modulated 45%

TAPE output

Tune bottom of T11 for max undistorted 1KC output signal

with lKC
10%

\

..LEFT ONLY'
signal and

Pilot

-8-

VOLTAGE CHART
PIN NUMBERS

r

NO.

TYPE
1

3

J

o

6

9

v1t
v21

6GK5

0.14

9
-1 A

6.3AC
0

0

113

0

o.74

12Alr7 6BA6 6AU6
6AU6
EM84

r29

6.34C
0 0 0 0 0 0

81 90 118
52

-0.9
90 118 52
155 0

0

0

v3t v4t v5t v6f
v71

-t.2
0

o o
0
IJ5

6.3AC
6.3AC

u.9
0

-0.58

6.3AC
0

-u./o
o

6.34C
LZt
LO7

33 1.8

IJJ

33

6AU6

1.8
o

6.3AC 6.3AC
45
113

v8*

6BE6
L2AV7

-t2.5
L29

L07

-o.65
0

v9t
v101

-2

o

0 0 0

2.75
1.18 o

6.3AC
0

6BL8
12AT7
12A)K7

to
140
LZ
T

-3.4 -4.9
0 0 4
4

6.3AC
0

t29
e7<
130 190 49 46
185

0.01

v11T

-0.02
1

-0.45
0

6.3AC
0

v12l
v13^
v14A

t2.3
L2.3

L2.3 12,3
L2.3 12.3

I
J5

L2AX7
L2AlK7

180

1.3 60 60 1.3 335 335 335 335

6.8

250
zJv
I /J

v15^

L2AX7 12AX7
7355
/

t2.3 t2.3 t2.3
NC NC NC NC

-o.05
-0. 05

o.57

u.5/
5J
0

v16
vl7
L

0
0 0 0 0

t2.3
0 0 0

-28

v18A

555

-28
-28 -28

vl9^
v20A NOTES:

7355 7355

-28 -28 -28 -28

6.3AC 6.34C 6.3AC 6.3AC

345 345 345 345

0

7

1. VTVM t 2. * 3. A 4. 5.

measurements with respect to chassis ground.

All grid voltages

measured with a 1 megohm resistor

in series

with a DC probe. SELECTOR switch SELECTOR switch SELECTOR switch 12AX7 DC filament

in FM position.
in AM position. in AUX position.
voltage measured between pin 4 and pin
5.

REPLACEftIENT PARTS
The components used in BOGEN equipment, with exception of items listed below, are standard parts available through all reputable parts jobbers. However several parts are custom-made to strict BOGEN specifications and should be replaced only with genuine BOGEN parts. These customPort No.
Descri piion and Pointer Assy. made parts are listed here arid are available through BOGEN distributors, service agencies or direct from the factory. When ordering parts specify part number, description of part and model number. Ref.
No.

Port No.

Description
50V.

70-9132-01 Carriage 03-0559-04 03-0572-01 03-0568-04 03-0557-02 94-0193-01 94-0175-01
Ref. No. C1

12-4061-02 Dial Window l2-4OO7-Ot Antenna Holdet
Knob,Tuning
Knob

c61 I c62 | cs4 I cs7 I
c58 c38 c11 cs3
, t

79-003-055 Capacitor, Electrolytic, 4mf.

Knob, Front Coax Knob, Rear Coax Lamp, NE2-E

::: I
I
[
C52

79-001-116 Capacitor, Electrolytic, 20mf, 350V. 79-001-078 Capacitor, Electrolytic, 30mf,
150V. 6V. 450V.

Pilot Light,

79-00l-026 Capacitor, Electrolytic, 100mf,

#12

Port No.

Description

c2

80-0129-01 Capacitor, Variable AM,/FM Tuning 80-2004-01 Capacitor, FM Osc Trimmer
(less screw)

I C59

79-010-031 Capacitor, Electrolytic, 4x20mf,

79-OLO-O22 Capacitor, Electrolytic, 2000mf, 15V.

-9-

REPLACEMENT PARTS (Continued)
Ref.
No.

Ref.

Port No.

Des

c

rip f-l o n

No.

Port No.
81-003-010 81-003-010
81.,003-010

Description

c51

cs7
c58

Capacitor, Ceramic, Disc.,
78-200-127 1500mmf, 14O0V.

c25
c63

c64
c65

L1 L2 L3 L4 L5 L6 L7 L8 L9
L11

95-5008-O1 95-500 1-01

Loopstick, AM Antenna ChokeAssy, RF
Choke, RF

95-5005-02 95-0003-32 95-0003-33 95-0003-34
95-50 18-0
1

Coil, RF
Coil, FM Mixer Input Coil, FM Oscillator
Choke, RF Choke, RF

95-5019-02 95-5009-01
95-50 15-01 95-5016-01.

Coil, AM Oscillator
Choke, RF Choke, RF

iill
L15
Lto

;i; I

LL7
R2 R42

95-5043-01 95-5042-01

Coil, RF Bypass Filter Coil, RF Bypass Filter
Resistor, Deposited, Carbon,
120K ohms

75-233-t24
76-LO7-O97

sws sw6 sw8 swg sw7 T1 T2 T3 T5 T7 T4 T6 T8 T9 T10 T11 Tl2 T13 T14 xl x2 x3 x4)
xs I x6 l

81-003-010 81-006-012 95-5017-01 95-5011-01 95-5013-01
95-5013-O1

Switch, HI Filter Switch, LOUDNESS Switch, Speaker OUTPUT Switch, AFC
Switch, ON-OFF Transformer, FM Antenna Input Transformer, FM IF Transformer, AM IF Transformer, AM IF Transformer, AM IF Transformer, FM IF Transformer, FM IF Transformer, FM Detector Transformer, Doubler 38KC Transformer, 19KC Transformer, FM Multiplex Osc' Transformer, Power Transformer, Output Transt-otmer, Output Diode, Silicon

1

95-5013-01 95-5010-01 95-5010-01 95-5036-01 95-5041-01 95-5044-01 95-5035-02 83-658j000 83-324-010 83-324-010

96-5022-0l 96-5022-0l
86-0016-01 96-s023-01

Diode, Silicon

Rectifier, Selenium
Diode, Silicon, Power Supply

R92 R100 R101

75-742-702

76-124-00l R12-R15 77-00r-532

R51-R55 77-00L-532 R17-R57 77-001-530 Rl03- 77-001-531 R104 R27 77-OOr-392 R66 77-OOt-392 swl 81-001-560 sw2 81-001-559 sw3 81-003-010 sw4 81-003-010

Resistor, Wirewound, 1 ohm, 2w Resistor, Wirewound, 1000 ohm, 7w Resistor, Wirewound, 2,500 ohm, 20w Control, Tone, Dual 2Meg ohm Pot. Control, Tone, Dual 2Meg ohm Pot. Control, Volume, Dual 500K ohm Pot. Control, Balance, Dual 1.5 Meg ohm
Pot.

x7' x8) xe i
x10,1

96-s007-02

Diode, Germanium, 1N541 Diode (2), Matched Pair, 1N542 Diode (2), Matched Pair, 1N542 Diode (2), Matched Pair. 1N542 Printed Circuit
Packaged Packaged Packaged Packaged Packaged

x11,X12 96-5007-01 x13,Xl4 96-5007-0r x15,X16 96-5007-01

Control, Bal. Adjust, 1O0K ohm Pot. Control, Bal. Adjust, 100K ohm Pot. Switch, Program SELECTOR Switch, MODE
Switch, Tape Monitor Switch, LO Filter

zL

78-907-001
78-909-00 1 78-9 17-001
78-9 16-00 78-9 1 1-00
1 1

\

78-910-001

Circuit, Circuit, Circuit, Circuit, Circuit,

I II

IIl
IV
V

ri'ATRR,AI{TY
The BoBen-Communications equipment which you have jusf p:rchased has been catefully tested and inspecfed befote leavinQ out factoty. lVhen ptopetly installed and opetated in accotdance with instructions fumished, it should Qive
exc eI I ent pe

tf otman c e and

t eI i a bI

e ope ta ti on.

workmanship for one year from date of sale to the original purchaser. Any part of the equipment which, under normal installation and use, becomes defective will be repaired or replaced by us, provided it is returned for our examination. Transportation prepaid, to our factory (or authorized service station). This warranty does not apply to equipment which has been subjected to abuse or accident, or which has been altered in any way; nor does this warranty extend to tubes, vibrators, or accessories, etc., not of our own manufacture and which are separately covered by the producing manufacturerts warranty. The registration card enclosed with the equipment must be filled out and mailed to us within 5 days of purchase to place the warranty in effect.

Bogen-Communications equipment

is guaranteed against all defects in material

and

*10*

+d a
F

s gs

E

f

9i

<; g9

le L

I
I I I

d:
EE;ii ' :
:Pt3! i iEiE

sEii! ;i:!'q
E!*'9*

E

*

q;;;;*i

i!!i! ;; ii:si E? 3i:3. ra

i;

::Et:,8: , j3:iiE:F !r

I

-x E<8j

q


3l g

9

Eln

e

E'9 :

;

F.

Figure

ll -

Schemotic of Model RP50

IF TROUBLE OCCURS

If trouble ever develops with your unit, please do not hesitate to ask our advice or assistance. lVe are interested in your Bogerr rmit for as long as you have it. Information can be obtained by writing to: Service Department, BogenCommunications, P.O. Box 5O0, Paramus, New Jersey. When communicating with us give the model number and serial number of your unit, Completely describe the difficulty encountered. Describe the effects each operating control has upon the symptoms of trouble. Include details on electrical connections to associated equipment and list such equipment.

When we receive this information we will send you service information if the trouble appears to be simple (e.g. bad vacuum tube, incorrect connections). If trouble requires servicing, we shall send you the name and address of the nearest Bogen authorized service agency to which you can send your unit for repair. When,shipping your unit, pack instrument well using the original shipping carton and filler material to prevent damage in transit. Send unit, fully insured and prepaid, via railway express. Do not ship via parcel post unless so instructed. The unit will be promptly repaired and returned to you via e:.press collect.

I

a

1-

PRINTED IN U.S.A.

s4-5224-Or

8-l

-12-