Free Audio Service Manuals - Free download Bogen CHB 10 Operating Manual

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INTRODUCTION

The Model CHBIOA is a general purpose 10 watt
public address amplifier. Separate microphone and
phone inputs and volume controls permit mixing d the
two inputs. Outputs are provided for all standard

speaker impedances and for operation with ZS-volt and
70-volt long-line speaker systems. A treble control is
provided for adjusting tonal balance.

TECHNICAL SPECIFICATIONS

OUTPUT POWER: 10 Watts; 14 Watts Peak
FREQUENCY RESPONSE: 40 to 12,000 Hz :2 db
HUM 8. NOISE:

MIC Input: 60dh below rated power

PHONO Input: 75db below rated power
GAIN:

MIC Input: llOdh

PHONO Input: 90db
SENSITIVITY:

MIC Input: 6 millivolts

PHONO Input: 0.2 volts
INPUTS:1 microphone (high impedance)

1 phone (high impedance, high level) can be
converted to 500/600 ohm line (wired
music systems) using BOGEN model
WMT-l matching transformer accessory.

OUTPUTS: Speaker- 4 Q, 8 Q, 16 Q, 25 Volt and 70
Volt lines. Quick-Disconnect type socket and con-
nector provided, in addition to screw-type termin-
als. By utilizing a BOGEN WMT-l transformera
zero-level output may be obtained atSOO/600 ohms
for feeding to a telephone line.

CONTROLS: Microphone Volume, Phono Volume, Tre-
ble and Power.

TUBES: 12AX7/ECC83, 7868 and 2 silicon rectifiers

POWER CONSUMPTION: 50 Watts, 105-125 Volts, 50
to 60 cycles AC

DIMENSIONS:

MODEL CHBlOA:11% wide, 53/4 high, 8% deep

WEIGHT:
MODEL CHBIOA: 10 lbs.

ACCESSORIES

BOGEN MOOEL WMT-l LINE MATCHING
TRANSFORMER

Used in conjunction with Bogen model CHBlOA
amplifier for distribution of background music directly
from leased telephone line wired music systems, the
WMT-l provides a perfect impedance match between a
500/600-0hm balanced line and the high-impedance
PHONO input of the amplifier. This transformer can
also be utilized as an output accessory for feeding a
500/600-ohm zero-level signal to a telephone line.

The transformer is housed in a compact metal en-
closure which is attached directly to the amplifier
chassis. It is furnished with a three-screw terminal

strip for line input or output connections, and with a
shielded cable terminated in a phono plug for output.
The WMT-l is screw-mounted to the amplifier chaSSis,
and no wiring or soldering is required to connect it to
amplifier.

The WMT-I accessory is normally connected to
the PHONO input of the CHBlOA amplifier. If this in«
put is already in use, the WMT-l transformer may be
connected to the MIC input of the amplifier. However,
it is first necessary to modify the WMT-l wiring as
described in the instruction sheet furnished with the
accessory.

INSTALLATION

UNPACKINO

Inspect shipping container and unit for indica-
tions of improper handling. The unit was carefully
checked before leaving factory. If unit has been dam-
aged, make an immediate claim to dealer or distributoi'
from whom it was purchased. If unit was shipped to
you, notify transportation company without delay and
place your claim.

CONNECTIONS BETWEEN COMPONENTS

Use single-conductor, low-capacity shielded wire
for connecting the record player, tape recorder, and
other components (except speakers) to ampliﬁer. Keep

leads under 35 feet in length.
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 CNOUNDING

The amplifier is furnished with an ac line cord
terminated in a three~prong plug. Plug the line cord
into a three-wire grounded outlet providing a nominal
lZO-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,
if a three-wire outlet is not available, an adapter such
as Leviton No. 5017 should be used to convert a
standard two-wrre 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.

INPUT CONNECTIONS

MICROPHONE

Any high-impedance type microphone (ceramic,

crystal, etc.) may be connected to the Microphone re-
ceptacle on the rear panel of the amplifier. Use a

Bogen CHB 10 Operating Manual

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