Bogen C 20 Operating Manual

Page 1

. Challenger Solid State Series

BOGEN.

DESCRIPTION

The Bogen Model 020 is a fully transistorized
public address amplifier rated at 20 watts. The unit
will accommodate a high-impedance microphone with
a control provided for the microphone input. Two
auxiliary inputs are provided for a tunerI tape recorder,
or phonograph with a ceramic or crystal cartridge .
Afader volume control selects and adjusts the level of
the desired auxiliary input and permits a gradual
changeoverfrom one input to the other. A treble control
permits adjustment for tonal balance.

Balanced outputs are provided for 4, B and 16-ohm
speakers, for 25-volt and 70-volt constant-voltage
systems. A quick-disconnect plug provides rapid and
convenient connections to a speaker.

The 020 amplifier operates from a 120-volt, 60 Hz
source and has a total power consumption of 54 watts.
A 3/4 ampere slo-blo line fuse and a 2 ampere slo-blo
output fuse protect the amplifier against overloads.

OPERATION

POWER

The power ON/OFF switch on the front panel
turns the amplifier on or off and controls power to
equipment connected to the auxiliary power receptacle.

MID

Use the MIC control on the front panel to adjust
the volume of the microphone input. Rotate the control
clockwise (to higher numbers) to increase volume.
Set the control to the minimum position (0) when the
microphone input is not used.

AUXI-IIIXI.

The AUX1-AUX2 control selects either of the two
auxiliary inputs and also controls the volume of the
selected auxiliary input. To select the AUX 1 input,
rotate the control counterclockwise. past the center
position (indicated by a triangle). Turning the control
farther counterclockwise increases the AUX 1 volume.

To select the AUX 2 input, rotate the control
clockwise past the center position. Turn the control
farther clockwise to increase the AUX 2 volume. If the
auxiliary input is not used. set the control to the mid
position (off).

MODEL C20

The AUX 1« AUX 2 control can be used as a
"fader" control, when both auxiliary inputs are con-
nected. With this control. you can gradually and
smoothly decrease the level of one input and then
gradually increase the other. The effect is one of
fading from one auxiliary input to the other.

RESET MARKER

Each volume control has a red reset marker on the
skirt of the knob. This marker is used to log a particu-
lar setting. Adjust the volume controls to the desired
level and slide the reset markers to coincide with the
midpoint mark on the front panel. The individual mark
can now be returned to zero or any other point, allow-
ing instant resetting to the predetermined level.

TREBLE

Use the THEBLE control to adjust the tonal
balance of the amplifier output. Leave the control in
the clockwise position for a flat high-frequency re-
sponse. To reduce the high-frequency response, rotate
the control in the counterclockwise (CUT) direction.
This position can be used to remove high-frequency
noise (such as record scratch).

ACCESSORIES
WMT-l LINE MATCHING TRANSFORMER
The Bogen WMT-1 line-matching transformer

provides an impedance match between the 020 ampli-
fier output and a 0 level, 500/600-ohm line. This may
be a telephone line connected to the switchboard for
internal paging or used with a wired music system,
No soldering is required to connect the WMT-i to the
amplifier.
GARRYING CASE AND SPEAKERS

Carrying cases for portable systems are available
with or without speakers. The Bogen Model CC-12 is a
carrying case only, while the Model 00-123 contains
two 12-inch, high-efficiency speakers. Both speaker
sections include 25 feet of interconnecting cable
terminated in a connecting plug. Since the 020 will
accommodate a single plug, a simple modification will
be required in order to use the two.

PRINTED IN U.S.A-
10-72 D

LEAR SIEGLERt INC.

0 5L5525~03

BUGEN DIVISION
Po, Box sun
PA RAUL/3, N. J omz

ZO-WATT TRANSISTOR
PUBLIC ADDRESS AMPLIFIER