Bogen MO100A Operating Manual

Page 1

MODEL MOTOOA

100 WATT
PUBLIC ADDRESS
BOOSTER AMPLIFIER

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LEAR SIEGLERJNC, @®
EOGEN DIVISION

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INSTALLATION AND OPERATING MANUAL

READ THOROUGHLY BEFORE OPERATING EQUIPMENT

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DESCRIPTION

The Bogen MOlOOA is an excellent booster am-
plifier capable of delivering 100 watts of audio power.
It is ideal for installation with sound systems in in-
dustrial plants, stadiums, theaters and auditoriums.
This high quality amplifier has exceptional power
handling ability over the entire range of audio frequen-
cies.

The MOIOOA has provisions for high and low
impedance inputs. Balanced-isolated speaker output
impedance of 16 ohms is provided as well as 25 volt
(6(2) C.T. balanced, 70 volt (499) C.T. and 115 volt
constant voltage sources, to eliminate difficulties
encounteredin speaker matching when unequal amounts

POWER OUTPUT: 100 Watts

NARNONIC DISTORTION: Less than 2% at 100
watts output.

FREQUENCY RESPONSE: i 2 db, 8 to 50,000

cps.

HUM: 80 db below rated output.

SENSITIVITY (for rated output): High impedance
input: better than 2 volts; Low im-
pedance (using 'IL600 transform-
or): better than 0.5 volt.

SPECIFICATIONS

of power are required for different speakers of a dis-
tribution system. Sockets are provided on the chassis
for power to an external preamplifier and for connec-
tion of a model KR6 remote standby power control unit.

Two or more M0100A booster amplifiers may be
connected in parallel for installations requiring more
than 100 watts of power. This is made possible by
interconnecting the CF. jacks of the units and
paralleling the inputs and outputs of the units. The
C.P." connections tie the feedback components of
the amplifier together, thereby balancing their char-
acteristics.

INPUTS: High impedance: 0.5 megohms; Low im-
pedance: 500/600 ohms (balanced) using
TL600 transformer; bridging: 10,000
ohms using TLlOK transformer.

OUTPUTS: 16 ohms balanced, 25 volt C.T. bal-

anced (6.250), 70 volt C.T. balanced
(490) and 115 volt output (for indus.
trial applications.)

POWER REQUIREMENTS: 250 Watts (2.5 amps at
117 volts) 50-60 cy-
cles AC (for P.A. ap-
plications).

TUBES: 7247, 8417 (4), 3 silicon rectifiers.
DIMENSIONS: 8 wide, 13 deep, 6% high.
WEIGHT: 33 lbs.

INSTALLATION

INPUT CONNECTIONS

High impedance: The amplifier can be driven to
full output, using the high impedance input, from any
preamplifier capable of developing 2.0 volts across a
500,000 ohm load. Connect the preamplifier output to
the HI Z phono type receptacle on the rear of the
amplifier.

Low impedance: The amplifier can be driven to
full output, using the low impedance input (model
TL600 input transformer), from any preamplifier cap-
able of developing 0.5 volts across a 500 ohm load.

Plug the Bogen TL600 transformer into the X1
socket on top of the MOIOOA chassis. Connect the

500/600 ohm input to the LO Z terminals on the rear
of the amplifier.

Bridging Input: The amplifier will accept a bridg-
ing input at 10,000 ohms by utilizing the Bogen TL10K
is plugged into the X1 socket, and the bridging input
is connected to the LO Z terminals on the rear of
the amplifier.

Obtaining signal from output of other power anpli-
fier: For amplifiers with a 70 volt output tap, the fol-
lowing circuit is recommended to deliver the signal re-
quired to drive theHI Zinput receptacle oftheMOlOOA.

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Figure l - Input Circuit
NOTE: The network above is in addition to the normal
load (loudspeakers, etc.) on the output of the driver
amplifier.

OUTPUT

An output impedance of 16 ohms as well as con-
stant voltage lines of 115, 70 and 25 volts have been
provided to meet speaker and distribution line match-
ing. For 16 ohms connect leads to 16 ohm terminal and
COM 1. For 70-volt operation connect leads to 70V
(499.) terminal and COM 2 terminal and connect short-
ing wire from COM 2 terminal to GND if grounding is
desired. For 70-volt balanced operation remove shorting
wire between COM 2 terminal and GND and connect
leads from 70V (499) to COM 2. For 25 volt operation
connect leads between 25V (69) terminal and COM 1;
for balanced 25 volt operation remove shorting link be-
tween COM 1 and GND. For 115 volt operation use
jones plug :7 P-302-CCT and class 1 wiring.

CONNECTIONS BETWEEN GOMPDNENTS

Use singleconductor, low capacity shielded wire
for connecting preamplifier to amplifier. Keep leads
under ten feet in length (unless cathode follower output
is employed).

Speakers may be connected with standard flexible
line cord (zip-cord) and up to 100 feet of cable may
be used without appreciable loss.

Make certain that all audio cables are kept away
from speaker cables, power cables, and power trans-
formers, and that speaker cables are kept away from
power cables.

POWER AND GROUNDING

The amplifier is furnished with an AC line cord
terminated in a three into a three-wire grounded outlet providing a nominal
120-volt, 50-60 cycle power source. This will ground
the amplifier as well as supply power to it.

It is advisable to ground the amplifier. Therefore,
it 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 threenwire plugs.
The adapter is provided with a grounding pigtail which
should be connected to the screw holding the wall
plate to the receptacle.

NOTE
In some areas, the wall plate screw
grounded. In this case it will be necessary to
connect a grounding wire between the GND
terminal on the rear chassis oi the amplifier and
a water or steam pipe.

AUXILIARY POWER

The auxiliary power receptacle located on the top
chassis is a three-wire grounded outlet. Hence, any
associated equipment connected to it with a three-
prong line cord will be grounded, providing the ampli-
fier or preamp power switch and the phone on«oft
switch must be used in turning off a record player
connected to the auxiliary receptacle. Flats may
deveIOp on the idler wheel of the phonograph if only
the amplifier power switch is used to stop the record
player.

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Figure 2 - MOlOOA Rear Panel