Bogen MT125B Schematic
A DIVISION OF LEAR SIEGLER, INC.
BOOSTER AMPLIFIERS
UNPACKING
The amplifier was thoroughly checked before leaving the
factory. Inspect the amplifier and shipping container carefully
for evidence of improper handling during shipment. In case of
damage, make an immediate claim to the dealer or distributor
from whom the unit was purchased. If the amplifier was shipped
to you, notify the carrier without delay and file a claim.
TECHNICAL SPECIFICATIONS
RATED OUTPUT POWER
TOTAL HARMONIC DISTORTION
FREQUENCY RESPONSE
HUM
&
REGULATION
NOISE
INPUT CONNECTIONS
Keep input leads away from the output leads and AC power
cables. Unless the driving source provides a low-impedance
output, keep the input lead under ten feet in length. Refer to
“Companion Units and Accessories” for Bogen preamplifiers
suitable for use with the amplifier.
MT60A
60W
Less than 2% at rated output 50 to 15,000 Hz
Better than 2 dB no load to full load
MODELS
2 dB 20 to 20,000 Hz
dB
below rated output
-85
MT-60A &
MT125B
125W
MT-125B
INPUT SENSITIVITY
INPUT IMPEDANCE
CONTROLS AND INDICATORS
OUTPUT LOADS (Const. Volt.)
OUTPUT LOADS (Spkr. Imp.)
SEMICONDUCTORS 6 Transistors, 7 Diodes
POWER CONSUMPTION
OVERLOAD PROTECTION
DIMENSIONS
WEIGHT
Hi-Z 50K ohm; Lo-Z 500/600 ohm with TL600 xfmr; Bridging input
(See chart for other impedances)
I20VAC,
output
120VAC
48-56 VDC, 3 Amp
48-56 VDC, 350 mA
60Hz, 25 watts @ Quiescent
(no output)
output
(no output)
3.1” x 8.5” x 14” (8 x 21.5 x 36 cm)
Level control, illuminated power switch, speech filters
8 and 16 ohms
60Hz, 180 watts @ Rated
@
@
18% lbs. (8.40 kg.)
200mV for rated output
with TL 100 xfmr
25V CT,
Rated
Quiescent
Thermal Circuit Breaker
Transient Protection Diodes
25V, 7OV, 11OV
AC Circuit Breaker
1:1
4, 8 and 16 ohms
(See chart for other impedances)
10 Transistors, 6 Diodes
120VAC
120VAC
48-56 VDC, 6 Amps
48-56 VDC, 600 mA
60Hz, 360 watts @ Rated
output
60Hz, 45 watts @ Quiescent
(no output)
output
(no
output)
5.25” x 8.5” x 15” (13 x 21.5 x 38 cm)
27 lbs. (12.3 kg.)
@
Rated
@
Quiescent
Printed in USA
8111 54469148
n
COMPANION UNITS AND ACCESSORIES
Model
CAM
CDM
CSM
CFC-1
RPK-37
TL100
TL600
Description and Inputs
Mixer-Preamplifier, 4 Hi-Z/Lo-Z Bal MIC, 1 AUX
Mixer-Preamplifier, 6 Lo-Z Bal MIC
Studio Mixer, 4 Lo-Z Bal MIC
2/ 3 Octave Equalizer
Rack Mounting Kit 19”
cm; mounts 2 units)
1: 1 Bridging Input Transformer
Line Input Transformer, plug-in, 500/600-ohm
impedance
x 5¼” (48.26cm x
17.78
High impedance input
The amplifier can be driven to full output from any source
developing 200
conductor, low-capacity shielded input cable to a standard
phono plug (Cinch
Hi-Z jacks on the rear of the chassis. Amplifiers may also be
connected in parallel by connecting a patch cord from Hi-Z
input to Hi-Z input of the amplifiers without loss of gain.
mV
across one of the Hi-Z inputs. Wire a single18A,
or equivalent) and connect to one of the
Low impedance input
The amplifier will match a low-impedance (500/600 ohm)
source if
socket Xl on the circuit board. Connect a twisted, shielded pair
(Bogen BB-8450, or equiv.) input cable to the BAL INPUT
LOW Z terminal strip on the rear of the unit. Use the two
outside terminals on the strip for input and connect the cable
shield to the GND terminal. If an unbalanced input is required,
connect a jumper from the GND terminal to an adjacent input
terminal.
a
Bogen
Remove
transformers.
all
Model TL-600 transformer is installed in
CA UTION
power from unit
before installing
OUTPUT
TERMINAL
STRIP OF
DRIVER
AMPLIFIER
AT 70V RI
AT
25V
RI =
Figure 1
-
IOK,
3.3K,½W
½W
Input from another amplifier
-
74-0736-A
Balanced bridging input
The inputs for two or more amplifiers may be paralleled
without loss of gain. To do this, install a Bogen Model
transformer in socket Xl. Connect the 6OOa source to the BAL
LOW Z terminal strip on the rear of the unit. Use the two
outside terminals on the strip and connect the cable shields to
the GND terminal. If an unbalanced input is required, connect a
jumper from the GND terminal to an adjacent input terminal.
TLlOO
Input from another amplifier
The amplifier can be driven from a standard public address
amplifier that provides a 25-volt or 70-volt constant voltage
output. To do this, connect the output of the amplifier to one of
the Hi-Z INPUT jacks via a resistor network (see figure 1). The
resistors shown in figure 1 are in addition to the normal
loudspeaker load on the output of the public address amplifier.
OUTPUTCONNECTIONS
CA UTION
Be sure to
connecting amplifier output.
A variety of outputs is provided from the amplifier, either
balanced or unbalanced. Refer to Table
connections. Generally, the ground link does not need to be
connected unless an unbalanced output is especially desired.
foIlow 1ocaI
electrical codes when
1
for appropriate
OUTPUT
VOLTAGE
*110V
7ov
50V
MT 60A
260
83.3
42
45V
32.5V
31v
‘16
25v 8to 10.5
* 13v
12.5V
*Unbalanced output
**Disconnect link
only
between COM and
-
-
2.8
2.5
-
TABLE 1
Output Connections
IMPEDANCE (ohms)
MT 125B
125
40
20
16
8to 10
-
4 to 5
1.4
1
1.25
GND
2
1 2
3 4 5 6 7
**
JUMPER
OUTPUT3-7
"
"
"
"
"
"
"
1 to3OUTPUT
5-7
36
4-6
3-6
3-5
l-2
34
2-7
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