Lear Siegler Bogen MCP35 Manual

BOGEN
A LEAR SIEGLER COMPANY
MCP35 MASTER CONTROL PANEL
PI-35/SI-35 SYSTEMS
INSTALLATION AND SERVICE MANUAL
IT IS RECOMMENDED THAT THIS ENTIRE MANUAL BE CAREFULLY READ BEFORE ATTEMPTING TO INSTALL
THE MASTER CONTROL PANEL OR ANY OF THE SYSTEMS COVERED HEREIN.
PI-35
TABLE OF CONTENTS
SECTION ONE: MCP35 MASTER CONTROL
PANEL.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TECHNICAL SPECIFICATIONS
.............
DESCRIPTION ...............................
INSTALLATION
.............................
Unpackin
. . . . . . . . . . . . . . . . . . . . . . . . . . 8
TECHNICAL SPECIFICATIONS
DESCRIPTION
. . . . . . . . . . . . . .
ASSOCIATED EQUIPMENT . . . .
Switchbanks....................
Switchbank Modules.
. . . . . . . . . . . .
SCR25 Call-In Module . . . . . . . .
TZMA Time Zone Module . . .
Staff Station Equipment . . . . .
Call/Emergency Switches . . . .
APPENDIX
......................
GENERAL WIRING.
..........
STATION WIRING.
...........
CONTROL CENTER WIRING.
MAINTENANCE.
.............
Bogen Service
.................
Replacing Components
.........
Replacement Parts
.............
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1986 Lear Siegler Inc.
Printed in U.S.A.
8610 54-5830-01

SECTION ONE: MCP35
Rated Output:
Frequency Response:
Distortion:
Inputs:
output:
Input Sensitivity (for rated output):
Power Requirements
(120VAC,
6OHz):
Dimensions:
Weight:
Controls & Indicators:
Finish:
TECHNICAL SPECIFICATIONS
Program-35W RMS
Intercom- 8W RMS
Program-
±2dB, 4OHz to 20kHz
Intercom-Shaped for maximum intelligibility
Less than 2% from
4OHz to 20kHz
Two Lo-Z balanced microphone inputs, convertible to Hi-Z; Hi-Z unbalanced AUX input;
Hi-Z booster input
Balanced 25VCT line
Microphone-300 µV
Auxiliary- 1 OOmV
1OOW maximum
19”W x 3-1/2”H x 10”D (48.2 x 8.9 x 25.4cm)
Approximately 10 lbs. (4.8 kg)
Input Selector Pushbuttons-MIC 1, MIC 2, AUX
Level Controls-MONITOR/LISTEN, PROGRAM (Front Panel)
Gain:
AUX, MIC 1, MIC 2, LISTEN, TALK, EMERGENCY PAGE (Rear Panel,
screwdriver-adjustable)
Distribution Switches-ALL ROOMS, EMERGENCY PAGE
Indicators-LED LEVEL Indicators
Bogen Sand with color-coded guides for PROGRAM, INTERCOM, and EMERGENCY
PAGE
DESCRIPTION
Bogen Model MCP35 Master Control Panel provides facilities
for instantaneous two-way communication and distribution of
paging, background music, or other program material for up to
75 speaker-equipped stations. A built-in 8-watt intercom ampli-
fier features a frequency response shaped for maximum intel-
ligibility. A separate
35-watt program amplifier ensures that
program material and/or emergency announcements are clear-
ly heard and easily understood. The front panel features step-
by-step instructions and color-coded indicia which permit even
first-time users to easily operate the system: the intercom chan-
nel guide indicia color-code is green, the program channel guide
indicia color-code is amber, and the emergency page guide
in-
dicia
color-code is red.
Input facilities are provided for external microphones, tuner,
cassette player, or other background music source. Level con-
trols and audible and visual monitoring of program material
are provided. Distribution is accomplished by simple pushbut-
ton program selection and by following color-coded indicia.
Emergency announcements to all locations take precedence
over program distribution and are accomplished with a single
pushbutton selection. Provision is included for time signalling,
telephone paging, and for connection to a booster amplifier.
The MCP35 Master Control Panel is used in conjunction with
Bogen
Room Selector and Annunciator Panels to direct inter-
com, or program, to selected staff stations. Replies are heard
through the front panel speaker of the MCP35. Calls from staff
locations are initiated through the use of call-in switches and
are announced by light and tone annunciation. Provision for
voice call-in is included.
Model MCP35 control panel permits the user to:
.
.
.
.
2
establish direct two-way voice communication between the
control panel and any speaker-equipped location via a
switchbank and the press-to-talk/release-to-listen pushbut-
ton, while maintaining simultaneous distribution of pro-
gram material to any other speaker-equipped location.
disseminate voice announcements to any individual, group,
or all speaker-equipped locations.
disseminate program material to any individual, group, or
all speaker-equipped locations.
easily make program source selection by pressing the appro-
priately labelled pushbutton corresponding to input from

INSTALLATION
LINE-MATCHING TRANSFORMERS
NOTE
Refer to Appendix for wiring information.
UNPACKING
Your unit was carefully checked before leaving the factory; in-
spect the shipping container and the unit closely for improper
handling. If the unit has been damaged, make an immediate
claim to the distributor from whom it was purchased. If the unit
was shipped directly to you, save all shipping material, notify
the carrier immediately and place your claim.
POWER AND GROUNDING
The MCP35 Master Control Panel operates from a
12OVAC,
60Hz source and consumes no more than 100 watts. An AC line
cord, terminated in a three-prong plug, is provided. The line
cord should be plugged into a three-wire grounded outlet pro-
viding a nominal
12OVAC, 6OHz power source. It is important
to ground the unit; therefore, if a three-wire outlet is not
available, an adapter such as
Leviton No. 5017 should be used
to convert a standard two-wire outlet for use with three-wire
plugs. The adapter is provided with a grounding pigtail which
should be connected to the screw holding the wall plate to the
receptacle. In some areas, the wall plate screw is not grounded.
In this case it is necessary to connect a grounding wire from the
EARTH GND terminal on the rear chassis of the MCP35 to a
water or steam pipe.
AUXILIARY POWER
An 840-watt, three-wire grounded outlet is provided on the rear
panel to supply power to accessory equipment. Auxiliary
equipment connected to this outlet will be grounded, provided
the Master Control Panel line cord has been properly
grounded.
\
8 OHMS I
SECONDARY
L-J
25 VOLTS
PRIMARY COM 4
2 I ½ 172 $, WATTS
The MCP35 Master Control Panel is designed for 25-volt con-
stant voltage distribution systems. All system loudspeakers
must be provided with line-matching transformers.
CAUTION
Speakers and transformers must be properly
matched with respect to power requirements.
INPUT CONNECTIONS
MICROPHONE INPUTS-terminal strips on the rear of the
MCP35 provide for two low-impedance balanced or unbalanc-
ed microphone inputs. Two-conductor shielded microphone
cable should be used.
TUNER/PHONO/TAPE INPUTS-two AUX jacks accept
single-conductor shielded cable.
TAPE RECORDER/BOOSTER AMP INPUT-accepts a
two-conductor shielded cable.
INTERCOM CALL-IN LINE-connect parallel lines from
station call-in switches with two-conductor shielded cable.
SWITCHBANK CONNECTION-nine-pin plug connects
three pairs plus three control wires from a switchbank.
TIME CLOCK INPUT-terminal strip provides single-circuit
time capability.
TELCO PAGE INPUT-jack accepts telephone paging input
from Bogen Model WMT-1 accessory transformer.
OUTPUT CONNECTIONS
A 25VCT external booster output is provided.
Figure 2-Model T725, Line-Matching Transformer
Figure 3-Model MCP35, Rear Panel
4

ADJUSTMENTS AND MODIFICATIONS
GAIN ADJUSTMENTS
(For Qualified Service Personnel Only)
Gain adjustments are made with a screwdriver at the rear
chassis; set the INPUT GAIN controls so that signal clipping
cannot occur. Proceed as follows:
1. Apply input(s) to the desired channel(s).
2. Set the corresponding front panel control(s) to maximum.
3. Adjust each appropriate INPUT GAIN control (looking at
rear panel, turn clockwise to increase or counterclockwise to
decrease gain) so that the red “0” (overload) LED lights;
then, turn counterclockwise only until the LED is
extinguished.
MODIFICATIONS
Defeating MIC 1 to CONSOLE MIC configuration:
Locate and loosen the two screws securing the jumper link
on the rear chassis terminal strip connecting the MIC 1 HI
terminal to the CONSOLE MIC terminal. (Refer to Figure
3-Rear Panel illustration.)
Move the link down, away from the MIC 1 HI terminal.
Tighten the screw securing the link to the CONSOLE MIC
terminal.
4. Remove the l-ohm resistor (or, on some printed circuit
boards, the wire jumper) behind the “S38” designation on
the pc board.
ASSOCIATED EQUIPMENT
TIME TONE/TELCO PAGE
A time tone can be put through all speakers when the CLOCK
terminals are joined together through a closure, as with a Bogen
CLK-6A Master Program Clock. Telco Page is accomplished
through a telephone audio pair plus closure. The audio pair
connects to a WMT-1 transformer which is plugged into the
TELCO PAGE jack. A 24-ohm resistor is connected in series
with the closure across the CLOCK terminals. When both are
included, the time tone change option has precedence over
Telco Page.
EXTERNAL BOOSTER AMPLIFIER
Model BPA-60 or BPA-125 (60 or 125 watts, respectively) pro-
vides increased power output. To install, simply connect a
cable, terminated with male phono plugs, from the MCP35
HI-
Z BST INPUT jack to the HI-Z INPUT jack on the rear panel
of the amplifier. Connect the
25V OUTPUT from the amplifier
to the
l/4" phone jack (25V BST OUTPUT).

SECTION TWO: Multi-Graphic PI-35 SYSTEM/SI-35 SYSTEM
Capacity:
TECHNICAL SPECIFICATIONS
PI-35 System-25 Stations, maximum
SI-35 System-25 Stations, expandable (in multiples of 25) to 75 stations
Dimensions: PI-35: 8-l
/2 “H x 20-l/2 “W x 11 “D (20.3 x 52 x 27.9cm)
SI-35: 12 “H x 20-l
/2 “W x 11 “D (35 x 52 x 27.9cm)
Weight:
PI-35: Approximately 20 lbs.
SI-35: Approximately 35 lbs.
Controls: Room Selector and Annunciator Panels-25 LED annunciators; 25 three-position
switches-PROGRAM, OFF, INTERCOM
Finish: Cabinet-Simulated walnut veneer
Panels-Bogen Sand with color-coded guides for PROGRAM, INTERCOM, and
EMERGENCY PAGE.
NOTE: All other specifications are the same as those given for the MCP-35.
DESCRIPTION
PI-35 System
Bogen Multi-Graphic Model PI-35 High-Powered Intercom
utilizes the MCP35 Master Control Panel and one SBA225
Room Selector Panel. Facilities are provided for the distribu-
tion of program information from external microphones,
tuner, cassette player, or other background music source.
SI-35 System
Bogen Multi-Graphic Model SI-35 Desk-Top Control Center
incorporates the MCP35 Master Control Panel, and has a
capacity of 75 speaker stations when configured with three
SBA225 Room Selector Panels. If a built-in program source is
desired, an FM/AM tuner can be incorporated with one or two
switchbanks; an FM/AM tuner with cassette player can be used
with one switchbank.
Calls from a speaker-equipped location in an PI-35 or SI-35
system, and speaker or staff handset in a Series 115 system, are
received with light annunciation and a tone signal. When
selected for intercom, or when a speaker station is monitored
from the control center, a supervisory tone is repeated at
regular intervals. Stations equipped with a CA-16 Call-In
Switch can prevent monitoring and still hear incoming mes-
sages when the switch is placed in the PRIVACY mode.
ASSOCIATED EQUIPMENT
SWITCHBANKS
Bogen Model SBA225 Room Selector Panels are capable of
connecting up to 25 speaker-equipped locations to a PRO-
GRAM, OFF, or INTERCOM channel. Each unit provides 25
lever-action, three-position, four-pole selector switches with
positive detents, and red LEDs.
Switch positions are graphically identified as PROGRAM A,
OFF 0, and INTERCOM C, each with color-coded indicia; the
program channel color-code is amber, the off position
color-
code is black, and the intercom channel color-code is green.
Each switch functions as follows:
A-(Up position, amber color-code)-connects a speaker
station to the Program channel for distribution of
microphone, tuner, cassette player, or phono generated in-
formation; is overridden by EMERGENCY PAGE.
0-(Center position, black color-code)-disconnects a
speaker station from the system; is overridden by
EMERGENCY PAGE and ALL ROOMS pushbuttons.
C-(Down position, green color-code)-connects a speaker
station to the Intercom channel; is overridden by
EMERGENCY PAGE pushbutton. Program information
will not be distributed to this station if the switch is left in
this position.
A white tabular strip, protected by a clear plastic snap-off
cover, is provided for labelling the station controlled by each
selector switch. When stations are identified by numbers, it is
common practice to connect and label the switches from left to
right (as viewed from the front or operator’s position), starting
at the uppermost switchbank.
Calls from staff stations are initiated by momentary depression
of a call-origination switch, which lights the corresponding
LED on the SBA225, while sounding a repetitive tone to bring
attention to the call. The LED remains “on” until the call is
acknowledged by placing the appropriate switch to the
“C”
position.

Each switchbank panel has provisions for accommodating the
add-on Bogen Model TZMA Time Zone Module, providing
up to six zones of time signalling, and/or the Model
SCR25
Call-In Module, providing the circuits necessary when using
call-origination switches which do not contain silicon-con-
trolled rectifiers.
SWITCHBANK MODULES
SCR25 Call-In Module
Bogen Model SCR25 Call-In Module is an annunciator latching
control bank designed for use with the SBA225 Room Selector
Panel. The SCR25 provides 25 silicon-controlled rectifiers and
programmable DIP switches and permits the use of a momen-
tary switch (such as the Bogen Model CA-17) and/or a
telephone handset with fixed closure for call-in from a staff
location.
The silicon-controlled rectifiers provide annunciator latching,
keeping the appropriate LED annunciator lamp illuminated
until the call is acknowledged. DIP switches are provided to
select the method of call-in (momentary switch and/or fixed
closure handset).
The module is connected to the switchbank panel by a simple
plug-in method and is constructed of G-10 glass epoxy. Termi-
nation is via wire wrap or centerline connectors (Panduit or
equivalent).
TZMA Time Zone Module
Bogen Model TZMA Time Zone Module is designed for use
with the SBA225 Room Selector and Annunciator Panel. The
module provides 25 six-position DIP switches and allows each
staff station circuit to be programmed to any of six time zones
for time signalling. Sealed relays, capable of handling 25 watts
of audio power, are used to ensure trouble-free operation.
The module is connected to the switchbank panel by a simple
plug-in method and is constructed of G-10 glass epoxy. Ter-
mination is via wire-wrap or centerline connectors (Panduit or
equivalent).
STAFF STATION EQUIPMENT
Staff station equipment may include wall- or ceiling-mounted
cone loudspeakers, or horn-type loudspeakers used to assure
clear, intelligible communications in relatively high-noise
areas. Staff stations reply hands-free when called. To initiate
calls, locations are provided with call/emergency switches, or
voice call-in, when equipped with a customer-supplied SPDT
momentary switch. Staff handsets can be used in a Series 115
configuration and do not require any wiring modification; a
switch has been provided on the SBA225 Room Selector and
Annunciator Panel for quick conversion.
Call/Emergency Switches
Voice Call-In Option-a customer-supplied single-pole,
double-throw, momentary contact switch may be used to con-
nect a staff station speaker to the call-in line while the switch is
actuated (see Figure 6).
CA-15 and CA-16-Models CA-15 and CA-16 Call/Emergen-
cy Switches, are momentary, rocker-type used to signal an ad-
ministrator or control center operator to establish communica-
tions through a two-way speaker. CA-16 incorporates a
PRIVACY mode to prevent monitoring.
Figure 6-Connection Diagram: Room Speakers with
Customer-Supplied Voice Call-In Switch
Figure ‘I-Wiring Diagram: A. Loudspeaker (Only);
B. Model CA-15; C. CA-16
9

APPENDIX
Switchbank Wiring
GENERAL WIRING
Where possible, locate the control center centrally, relative to
the rooms being served, in order to minimize the length of
speaker cables. It is advisable that the unit be so oriented that
the operator, program director, or other interested parties are
able to observe the controls at all times. Provide adequate light-
ing and ventilation. Do not locate the control center close to
heat sources, such as radiators or warm-air ducts, or against a
wall which would inhibit air flow through and around it.
Wires-Class II wiring may be used for all audio and annunci-
ator lines. Make certain to properly support cables to prevent
sagging or strain. Keep wires clear of objects which would sub-
ject them to heat, friction, or other abuse.
Use No. 18 AWG shielded pairs with insulated outer jacket for
speaker lines. Annunciator lines require a third wire, which
usually is No. 18 AWG insulated wire with clear insulation. The
number and type of wire running from each room to the control
center are dependent upon the type of speaker operation re-
quired. Refer to Table I for suggestions.
Call Switches and Speakers
Outlet Boxes-Flush-mounted switches require single-gang
outlet boxes; make certain to place them in a location which
will allow personnel to readily access the switch for call-in
and/or communicating via the room speaker. Suggested height
(above finished floor) for installation of switches is about four
feet; speakers should be placed at a height of about seven and
one-half feet.
Soldering Instructions
Solder-Do not use acid-core solder or acid paste. Make all
solder connections with standard 60/40 resin-core radio solder.
Do not apply excessive heat; soldering irons or guns rated from
75 to 200 watts provide ample capacity.
Grounds-Do not connect cable shields to earth grounds or
convenient metal objects. It is important to connect cable
shields only as shown in the wiring diagrams.
STATION WIRING CAUTION
Make certain to connect all wires according to
color-codes given in the appropriate diagram.
Series CA- switches are designed for flush-mounting in a stan-
dard single-gang electrical outlet box, or for surface mounting
in a standard deep single-gang wire mold outlet box. Locate the
box to allow personnel convenient access to the switch for
call-
in and/or communicating via the room speaker.
CONTROL CENTER WIRING
Remove the rear panel to access the switchbank terminals. A
row of male centerline terminals is located across the rear of
each switchbank; an individual selector switch corresponds to
the four terminals directly behind it.
Wire switchbanks as shown in Figure 5, using one female
centerline plug
(Bogen Model Number 25-18, Panduit or
equivalent. Centerline plugs are also available in
#20 and #22,
Bogen Model Numbers 25-20 and 25-22) to terminate wires
from speaker and/or
call switch; connect shield to the ground
terminal. This is the only place where speaker shields should be
grounded.
Voice Call-In Option
Figure 6 shows room connections and the customer-supplied
switch required for voice call-in. The wiring must be completed
by connecting the shielded pair from the switch to the terminal
strip at the rear of the MCP35 chassis. The polarity of the inner
conductors is not critical, but make certain to connect this cable
shield to the shield of the cable already connected to the ter-
minal strip.
Note that only one cable goes to the terminal strip. Usually,
cables from all room switches utilizing this function are con-
nected by a common control cable, and one cable is run to the
control center. If this type of installation is not practical, the
control cables for two or more switches are run to the control
center and are connected in parallel at a junction box; a single
control cable is then run to the terminal strip at the rear of the
MCP35 chassis.
Call/Privacy Option
Figure 7 shows the room connections and switch required for
incorporating the optional privacy feature in the system.
MAINTENANCE
CAUTION
There are no user-replaceable parts within the
unit. Have all internalservicing done by a qualified
technician. The warranty will become void if
repairs are made by other than the Bogen Service
Department or an authorized service agency.
BOGEN SERVICE
Our Service Department is interested in the maintenance of
your
Bogen equipment. In the event of any difficulty, do not
hesitate to ask our advice or assistance. Information may be ob-
tained by writing to: Service Department, Bogen, A Lear
Siegler Company, P.O. Box 575, Ramsey, NJ 07446.
When communicating with us, give the model and series
designation of your unit, describe the difficulty and include
details on the electrical connections to associated equipment,
such as amplifiers, speakers, etc. We will send you information
if the remedy appears simple. If service is required, we will send
you the name and address of the nearest authorized
Bogen Ser-
vice Agency.
When shipping your unit, pack it well, using the original ship-
ping carton or a similar container and filler material to prevent
damage in transit. Send the unit, fully insured and prepaid, via
UPS or any responsible carrier. It will be returned to you
freight prepaid while in warranty.
a-l

Table II-Cable Running Chart
Type of Call Switch or
Wires from Room to Control Center Wires from
Room Switch to Room Speaker
Device Used with Speaker
No. 18 AWG Shielded
No. 18 AWG No. 18 AWG Refer to
Voice Call-In, Non-Private
(customer-supplied SPDT
2* 0
1
6
momentary switch)
None (loudspeaker only)
1
00
7A
Call Switch (CA-15)
111
7B
Call Switch, Privacy (CA-16)
111
7c
*Alternate Method: Run two cables from room nearest the control center and one cable from each remaining room. Run one
cable in a loop or branch circuit connecting all room switches.
REPLACING COMPONENTS
CAUTION
Improper soldering may damage components or
the printed circuit board. Such damage can void
the warranty,
Many semiconductor components are soldered in place to en-
sure maximum reliability. When soldering transistors or
diodes, use a heat sink (such as a small alligator clip) between
the component and the source of heat. Unless you are experi-
enced in the removal of IC micromodules, do not attempt to
remove them, since excessive heat can damage an IC and/or the
printed circuit board. If you are certain that an IC is defective,
the easiest method of removal is to cut the leads off close to the
component and desolder the leads individually. If you are not
certain an IC is defective, the use of a low-wattage, vacuum-
type desoldering tool (such as Ungar Type 7800) is advised.
REPLACEMENT PARTS
Most components are standard parts available through
reputable parts suppliers. The parts listed herein may be obtain-
ed directly from the factory. When ordering a part, specify the
part number as listed, the model number of the unit, and give
the series designation, which is a letter followed by numbers,
printed on the chassis. For parts on the circuit boards, also give
the component board assembly number, which begins with
“45”.
Schematic
Part
Designation Number Description
PC Board
-
45-7267-05 P.C. Board Ass’y.
C2,38,39,89
79-008-036 Cap., Elect., 47 µF, 16V
C3,6-8,15,16,
21,22,27,
28,40,43,47 79-008-031 Cap., Elect., 10
µF, 16V
C14,26,58,61,
70,76,79,86 79-008-024 Cap., Elect., 22
µF, 16V
C49,50,52-54,
57
79-008-042 Cap., Elect., l.0µF,.25V
C59,67,78,83 79-008-053 Cap., Elect, l00µF, 35V
C65,66,82,85 79-123-001 Cap., Elect., 1000
µF, 35V
C71,73,88,101 79-008-033 Cap., Elect., 2.2
µF, 16V
C94,95
79-008-057 Cap., Elect., 47 µF, 50V
Schematic Part
Designation Number
CR2-18,20,22,
23,27-29 96-5430-01
CR19,24 96-5333-01
CR21 96-5202-01,
or 96-5202-02
IC1,2 96-5648-01
IC3 96-5656-01
IC4,5,7,8
96-5649-01
IC6 96-5455-01
IC9 96-5441-01
IClO 96-5474-01
K1,2 90-0202-01
L1,2,11-21 95-521 l-01
LEDl,3 96-5576-02
LED2,5 96-5576-03
LED4 96-5576-01
Q1,3,7-9,11,
Q2l,64-6,10,
96-5528-01
13-15
96-5527-01
Q12
96-5647-01
R9,19,28,31,
40,58,60,87,
88,123 77-007-004
R65,69,101,
Description
Diode, lN4148
Diode, 400 prv
@ 1A
Triple Diode, HVR-3
IC, CA3280E
IC, CD4069CN
IC, LM1875T
IC, CD4093BE
IC, LM340T15
IC,
µ A7915C
Relay, DPDT,
12VDC
Choke, Wide Band
LED, Yellow
LED, Green
LED. Red
Transistor,
2N3906
Transistor, 2N3904
Transistor, 2N6107
Trimpot, 100 kilohms
105,109
R126,127
R128,129
R38,56
Sl-8
76-147-087 Resistor, 1 ohm, 1/4W, 5%
76-114-098 Resistor, .47 ohms, SW,
w/w 10%
76-114-109 Resistor, 3.3 ohms, 5W,
w/w 10%
77-001-837 Control, 100 kilohms, Audio
Taper with Mtg. Hrdwr.
81-004-109 Pushbutton Switch
& Knob
Ass’y.
C201,202
CR101
FlOl
TlOl
-
-
-
-
-
-
Chassis
79-124-001 Cap., Elect., 4700 µF, 50V
96-5650-01 Bridge Rectifier
94-0003-02 Fuse,
1A
83-836-000 Transformer, Power
93-0062-01 Speaker, 8 ohms
85-1344-01 Switchbank Cable Ass’y.
85-1345-01 Jack Ass’y.
93-5017-01 Console MIC Ass’y.
93-5016-01 Microphone
03-0682-01 Knob, Green
03-0682-02 Knob, Yellow
BOGEN
A LEAR SIEGLER COMPANY
50 SPRING STREET. PO BOX 575
RAMSEY. NJ 07446 [phone]