Bogen CT60 Schematic
A DIVISION OF LEAR SIEGLER, INC.
AMPLIFIERS
Bogen
Amplifiers are versatile, silicon-transistor
amplifiers designed for professional-quality sound reinforcement requirements. Model CT-35 is rated at 35 watts,
Model CT-60 at 60 watts and CT-100 at 100 watts output.
Four high-impedance microphone inputs are provided,
each convertible for use with low-impedance microphones.
A simple modification converts inputs to low-impedance
unbalanced; balanced inputs require accessory plug-in
transformers. Two mic inputs and one auxiliary input may
be remotely controlled or muted for announcements over
another mic channel. The same two mic inputs may be converted to accept a magnetic source, i.e., turntable or tape
player. Two auxiliary inputs with fader control are provided, as well as a bridging input.
Acousta-Master amplifiers feature the
acoustic equalizer filter circuit, which provides a means of
boosting or attenuating any of five selected frequencies to
suit individual room acoustics. An electronic limiter circuit
provides uniform output regardless of wide variations in the
input level. With this capability, all paging calls can be
transmitted with the same volume and clarity.
An output terminal strip and connectors at the rear of
the amplifier provide standard speaker impedance taps, as
well as connections for
There is also a bridging output for feeding a tape recorder.
Bogen
line input and output connections, remote volume control,
and channel override facilities. Further information is
contained in the Accessories section.
The amplifier operates from a
source. A three-prong line cord provides automatic ground-
ing when connected to a three-wire power outlet. The
power line is protected by a circuit breaker, and the output
transistors by a thermal overload device, which shuts off
the unit when the temperature of the heat sink rises
excessively.
Acousta-Master@ CT Series Public Address
preamp-mixer-
Bogen
built-in
25volt
or
70-volt
balanced lines.
accessories provide the amplifier with telephone
105-125
volt,
50/60
Hz
Models CT
35/60/100
INSTALLATION
UNPACKING
The amplifier was carefully checked before leaving
factory. Inspect shipping container and unit carefully for
indications of improper handling. If the unit has been
damaged, make an immediate claim to distributor from
whom it was purchased. If the amplifier was shipped to
you, notify transportation company without delay and
place your claim.
POWER AND GROUNDING
The ac line cord has a three-prong plug which should be
plugged into a three-wire grounded, 120 volt, 60 Hz outlet.
As it is important to ground the amplifier, where a threewire outlet is not available, use an adapter (e.g., Leviton
No. 5017) and connect the grounding pigtail to the screw
securing the wall plate. If the wall plate screw is not grounded, connect a wire from the GND terminal of the amplifier
to a suitable ground.
AUXILIARY POWER
The auxiliary power receptacle on the rear chassis (see
figure 1) is a three-wire grounded outlet, which can supply
power to accessory sound equipment. When connecting
associated equipment with a three-prong cord, appropriate
grounding is accomplished when the amplifier line cord is
properly grounded.
Use the ON/OFF switch on the phonograph for turning
off a record player connected to the auxiliary receptacle, as
use of the amplifier power switch could cause flats to
develop on the idler wheel of the phonograph.
Be sure that the auxiliary components do
not draw more than 250 watts on the CT35
and CT 60, and 500 watts on the CT1 00.
Prmted in
USA 8104
54-5629-l 4
TECHNICAL SPECIFICATIONS
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POWER OUTPUT (RMS at 1000Hz)
FREQUENCY RESPONSE
REGULATION
HUM & NOISE (below rated output)
SENSITIVITY
OUTPUTS
OUTPUT CONNECTIONS
INPUTS
CONTROLS
FILTERCONTROLACTION ±
COMPRESSION
LINE FUSING
SEMICONDUCTORS
POWER CONSUMPTION
DIMENSIONS
SHIPPING WEIGHT
(for rated output)
MIC, 60
Hi Z MIC, 3 mV; Low Z Bal MIC, 0.3
30 mV; AUX 150
4, 8,
Bridging, 30
500/6OOa telephone line input or output with WMT-i optional accessory.
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2 Quick disconnect type sockets with plugs provided, in addition to screw-type
terminals, tape/booster jack, and provisions for WMT-1.
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4 Hi Z MIC inputs, each convertible to Low Z Bal or Unbal MIC; 2 AUX inputs with
fader control; MIC 1
telephone line with optional WMT-1 accessory; 3 inputs for remote volume control.
4 MIC Volume, AUX 1, AUX 2-fader, MASTER VOLUME, 5 Equalizer Filter Slide
Controls. 1
10
dBB
5 milliseconds attack time, 2 seconds decay time, max. compression 30
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18
silicon transistors 18 silicon transistors 20silicon
16-3/8”W
(41.6cm x 32.4cmx12.lcm)
19 lbs. (8.6 kg)
CT35
35 watts
dB
for both low and high impedance; AUX 70
mV
16
ohms 8,16
25V CT
7ov 7ov
mV;
Tape, 0.68 V. TAPE/BOOSTER/BRIDGING outputs,
&
Compressor.
variationatthefollowingfrequencies:
0.93 A Hold
2 Zener Diodes; 8 Silicon Diodes (10 in
0.86A, 96W
x
12¾”D
x
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@
less than 2% total harmonic distortion
50Hz to 15kHz ±2dB
4 convertible to MAG input; Bridging input; 500/600 ohm
1 Power Switch.
Resettable Circuit Breaker
4¾”H
CT60
60 watts
2
dB
mV;
Low Z Unbal MIC 0.3 mV; Bridging Input,
ohms
25V
CT
1.65 A Hold 2.5 AHold
120 V AC,
221bs. (9.9 kg)
50/60
1.6A,
170w
16-3/8”W
(41.6cm x
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dB;
Fundamental, 80
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80Hz,300Hz,1 kHz,3kHz,10kHz.
CTl00)
Hz
x
13 3/4”D
34.9cm
CT100
100 watts
4, 8,,16ohms
25V
7ov
dB
2.9A, 300W
x
4 3/4”H
x 12.lcm)
26 lbs. (11.8 kg)
dB
CT
transistors
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INPUT CONNECTIONS
HIGH IMPEDANCE MICROPHONES: The amplifier is
shipped in a configuration for direct connection of high
impedance microphones (50k ohms) to the four MIC input
receptacles of the amplifier. The microphone lead should be
a single-conductor shielded cable under 35 feet long and
terminated in a Cannon XLR-311C connector
No. 85-0124-01) as shown in figure 2.
In the event jumpers on the printed circuit board have
been rearranged and must be returned to the configuration
for direct connection of high impedance microphones,
connect the two jumpers involved as follows: the first
jumper between terminals 11 and 19, and the second
(Bogen
Part
be-
tween 8 and 18. Three jumpers are not involved and are
stored by connecting both ends to an assigned terminal: the
first jumper on terminal 20, the second on 24, and the third
on 25.
BALANCED LOW-IMPEDANCE MICROPHONES:
impedance accessory transformers are required to permit
the amplifier to accept inputs from microphones rated from
50 to 600 ohms. Before connecting microphone, insert
appropriate plug-in transformers and reset jumpers adjacent
to transformer sockets as described in the Accessories
tion. Use a two-conductor shielded cable for the
phone lead, terminated in a Cannon XLR-311C connector,
as shown in figure 3.
-2-
Low-
+
micro
sec-
,
CIRCUIT
BREAKER
SPEAKER
SOCKETS
OUTPUT
TERMINALS
TAPE/BOOSTER
TAPE
OUTPUT
AUX
INPUTS
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AUX
POWER
Note:
Heat sink for Model CT-35
is an aluminum plate.
IMPEDANCE
SELECTOR
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REMOTE/PRECEDENCE
TERMINALS
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HEAT SINK
Figure 1 - Rear Panel, CT-100
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WMT-1
OUTPUT
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BRIDGING
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MIC INPUTS
UNBALANCED LOW IMPEDANCE MICROPHONES:
Jumpers with push-on connector lugs are mounted on the
printed circuit board assembly for use in converting the
MIC input channel circuits. See note 4 on the schematic
diagram, figure 6. To convert MIC 1 and 4 for unbalanced
low impedance use, connect jumper between pins 20 and
2 1; to convert MIC 2 and 3, connect jumper between pins
25 and 26. As shown in figure 2, connect a jumper between
terminals 1 and 2 of the connector and wire microphone to
pin 3 of the plug.
AUXILIARY INPUTS: Two auxiliary inputs are provided
for high-level, high impedance inputs. these may be used to
connect a radio tuner, tape recorder, or turntable utilizing a ceramic cartridge. An input signal of 0.15 volts is
required to obtain full output from the amplifier.
Use single-conductor shielded cable terminated in an
RCA phono plug for connecting auxiliary component. If
hum is experienced after making connections, run a ground
wire between the chassis of the auxiliary unit and the GND
terminal on the amplifier.
BRIDGING: The amplifier may be bridged to a second
Bogen
CT amplifier to double the number of inputs. Connect a single-conductor shielded cable, terminated in an
RCA phono plug at each end, between the rear panel
BRIDGING receptacles of the two amplifiers. Any input to
either amplifier will then be fed through and available at
the output of both amplifiers. The amplifiers must each
feed separate speaker systems.
When two amplifiers are bridged together,
any adjustment of the MASTER, COMPRESSION or Acoustic Equalizer controls in
one amplifier will not affect the output of
the other amplifier.
:
Figure 2
(CONNECTION
LOW IMPEDANCE MICROPHONE
LOW IMPEDANCE MICROPHONE
-
Connecting Microphone Cable Connector
SAME
FOR
BALANCED
UNBALANCED
MAG
PHONO)
XLR-311C
XLR-311C
2
J
XLR-311C
-3-
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