Bogen MT125A Schematic
6OGENca
MODELS MT60
&
MT125A
Solid-State
PA Components
INSTALLATION
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.
INPUT CONNECTIONS
Keep the input lead away from the output lead and ac
power cables. Unless the driving source provides a
low-impedance output, keep the input lead under ten feet
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POWER OUTPUT:
PEAK OUTPUT:
E:
:tiULAl‘IUN
PUT SENSITIVITY (FOR
RATED OUTPUT):
INPUT IMPEDANCE:
OUTPUT CONNECTIONS:
OUTPUT IMPEDANCE
(BALANCED OR UNBALANCED):
CONTROLS AND INDICATORS:
SEMICONDUCTORS:
POWER CONSUMPTION:
:
’
AUXPOWERRECEPTACLE:
OVERLOAD PROTECTION:
DIMENSIONS:
WEIGHT:
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60 watts
120 watts
±2 dB,
Less than 2% at rated output
-80
dB
Less than 2
Hi Z
Hi Z 50k; Lo Z
8R:
25VCT, 25V,
25VCT;
83SJ
AC power switch, ac power indicator lamp, volume control, music-speech selector
switch.
6 silicon transistors; 7 diodes 8 silicon transistors; 7 diodes
120VAC 60HZ. 168 watts @Rated
output
120VAC
(No Output) (No Output)
48-56 VDC, 1 Amp
output
48-56 VDC, 15 mA
Output)
550
AC circuit breaker. 1
circuit breaker. I
breaker, 95°
approximately 2 minutes.
8” W. x
18½
Ibs.
MT60
30 Hz to 20k Hz
below rated output
dB
variation from no load to full load.
0.2V;
Lo Z balanced with TL600 xfmr,
10.4s2 (25V);
(70V)
60HZ, 22
watts
13”
D. x 6¼” H.
TABLE I. COMPANION UNITS AND ACCESSORIES
Model
CAM
CM
CHS-M
CTM
MX6A-5
RPK-I 8
TL600 Low-impedance
TL10K
500/60052
16fi, 70V terminals
watts
.65A
C.
with recovery in
with TL600 xfmr; Bridging
8R;
16R;
@
Quiescent
@
30 watts
@
Quiescent (No
.65A
Hold: DC
Hold; Thermal
60-Watt
and
125-Watt
Booster Amplifiers
Description
Five input solid-state preamplifier mixer.
Five input solid-state preamplifier mixer.
Seven input solid-state preamplifier mixer.
Seven input solid-state preamplifier mixer.
Six input solid-state preamplifier mixer.
Rack mounting kit 19” x 7” (mounts 2
units).
(500/6OOs1)
transformer.
Bridging (1
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125 watts
250 watts
±2 dB,
Less than 2% at rated output
-80 dB
.045V;
8R,
25VCT;
(7OV)
120VAC
output
120VAC 60HZ, 30 watts
48-56 VDC,
48-56 VDC, 15
Output)
390 watts
AC circuit breaker.
circuit breaker,
breaker, 104” C. with recovery in
approximately 2 minutes.
8” W. x
25
Ibs.
Oka)
plug-in transformer.
MT125A
40 Hz to 20k Hz
below rated output
Hi Z with TL
lOk
with TL
25VCT, 25V, 16a,
5s2
(25V); 8R, 16R; 40R
60HZ, 300 watts @ Rated
2.25
Amps @ 62.5
mA @
2.5A
2.5A
13”
D. x 6¼” H.
plug-in
10k
xfmr,
10k
xfmr.
70V terminals
@
Quiescent
watts
Quiescent (No
Hold; DC
Hold; Thermal
0.lV.
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*Variations in performance
PRINTED IN U.S.A.
3-75
PMP #1390
characteristics normally
LEAR SIEGLER, INC.
will not
exceed I
dB.
54-5521-01
in length. Refer to Table I for
Bogen
preamplifiers suitable
for use with the amplifier.
HIGH IMPEDANCE INPUT: The amplifier can be driven to
mV
full output from any source developing 200
across one
of the Hi-Z inputs. Wire a single-conductor, low-capacity
shielded input cable to a standard phono plug (Cinch
18A,
or equivalent) and connect to one of the Hi-Z jacks on the
rear of the chassis.
LOW IMPEDANCE INPUT: The amplifier may be driven
from a low-impedance
(500/6OOa) input, if a
TL-600 transformer is installed in socket
chassis. Connect a twisted, shielded pair
Bogen
X1
on top of the
(Bogen
BB-8450,
Model
or equiv.) input cable to the BAL. INPUT LOW Z terminal
strip on the rear of the unit. Use the two terminals on the
right of the strip and connect the cable shield to the GND
terminal on the left. If an unbalanced input is required,
connect a jumper from the GND terminal to the adjacent
input terminal.
CAUTION
Remove all power from unit before installing
transformers.
BRIDGING INPUT: The inputs for two or more amplifiers
may be paralleled without loss of gain. To do this, install a
Bogen
Model
TL-IOK
transformer in socket X1 on top of
the chassis. Connect the bridged inputs to BAL LOW Z
terminal strip on the rear of the unit. Use the two terminals
on the right of the strip and connect the cable shields to the
GND terminal on the left. If an unbalanced input is
required, connect a jumper from the GND terminal to the
adjacent input terminal.
CONSTANT-VOLTAGE INPUT: The amplifier can be
driven from a standard public address amplifier that
provides a
25volt
or
70-volt
constant voltage output. To do
this, connect the output of the amplifier to one of the Hi-Z
INPUT
resistors shown in
jacks
via a resistor network (see figure 1). The
figure 1
are in addition to the normal
loudspeaker load on the output of the public address
amplifier.
OUTPUT CONNECTIONS
Speakers may be connected with standard flexible line
cord (zip-cord) and up to 100 feet of cable may be used
without appreciable loss. Class II wiring is acceptable unless
prohibited by local codes.
70V
CONSTANT-VOLTAGE
OUTPUT. For 70V constant-
voltage operation, connect the speaker leads to the 70V
and COM 2 terminals on the rear of unit. If ground-
ing is required, connect a jumper from the COM 2 to GND.
25V
CONSTANT-VOLTAGE OUTPUT. For
25V
constantvoltage unbalanced operation, connect the speaker leads to
25V
and COM 1, leaving the link connected between
COM
1
and GND. For balanced operation, open the link
COM 1
between
and GND. If the output transformer center
tap must be grounded, connect a jumper between 25VCT
and GND.
16 OHM
&
8 OHM OUTPUT.
For 16fi or 8R operation,
connect the speaker leads between the desired output
1.
terminal and COM
If ungrounded operation is desired,
open the link between COM 1 and GND.
CONNECTING AMPLIFIERS IN SERIES
Pairs of
Bogen MT1 25A
amplifiers or MT60 amplifiers
can be connected in series to effectively double the power
output into the same loadline. See Figure 2 for connection
diagrams. Be certain to remove the link between COM 1 and
GND of amplifier No. 2.
Depending on the impedance of the signal source, apply
the input signal to the HI Z or LO Z input of amplifier No.
1. Use jumpers to connect the appropriate input of
amplifier No. 2 in parallel with that of amplifier No. 1.
It is necessary that both amplifier volume controls be at
the same setting to assure that each amplifier will share the
load equally.
AMPLIFIER I
COM1
GND
16f-l
en
AMPLIFIER I
GND
COM1
25VCT
AMPLIFIER 2
COM1
GND
AMPLIFIER 2
GND
COM1
l6n
FOR MT60
8R FOR MT125
874-1017-01
25VCT
_
a
-
OUTPUT
TERMINAL
STRIP OF
DRIVER
AMPLIFIER
AT 70V RI . 10K,
AT
25V
RI -
3.3K, ½W
Figure 1 - Connection to Constant -
P.A. Amplifier Driver.
½W
74-0730-A
POWER
AMPLIFIER
Voltage
L_
Figure 2 - Connecting Amplifiers in Series
GND COM I
A74-2018-01
Figure 3 - MT1
1
MT60 AND
16fl
25A
Connections for
MT125A
I
COM2 7ov
120-Volt
Operation
L*25V
b
120V
125W
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