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Front Panel Controls; Mode Switch; Volume Control - HP Barney Oliver Manual

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Oliver Audio Amplifier
The
of
with a minimum of controls. It is a
mark with a colored dot the
purpose controls so that the inexperienced
naive operator need only check these
and achieve
input selector and volume control.
A.
INPUT Selector
This switch allows a choice of any
five inputs. From left to right these are:
TUNER
dBm) from FM,
tuner.
TAPE
dBm) from an
or
Accepts
PHONO
stereo phonograph
Accepts inputs from any line­
AUX 1
level audio circuit such as tuners,
tape decks or other sources.
AUX2
B.

MODE Switch

This control allows the left and right chan-
nels of the
to be delivered to the
in various ways. The center
stereo operation. From left to right the modes are:
Left stereo channel only to left
L
Righ t stereo channel only to
R
Stereo channels reversed. Left
R
channel to right speaker, right
channel to left
Direct
DIR
channel to corresponding
-Normal position.
C
RON
PANE
has been
"normal"
results
only the
one of
input at line level (0
or FM/AM
at line level (0
stereo
channel tape deck.
from a
is normal for
Each stereo
ION II
CONTRO
Both channels mixed and deliv­
DUAL
ered to both
Monophonic
L
"left" channel over both speakers.
Monophonic
R
speakers.
The L
and other
over either one ( STEREO
side)
C.
FI L TER Switch
This control allows various
roll-offs to be introduced. From left to right the
positions are:
Introduces a high frequency cut­
5
off at 5
kHz. Useful for
records and AM
Introduces a
8
off at 8 kHz with a null at 10
kHz. Useful for good 78 rpm
records and A M
Introduces a maximally flat 18
10
dB/octave cutoff at 10 kHz. Use­
ful for slightly noisy conditions.
20
Normal
off at 20 kHz.
D.

VOLUME Control

dual
A
ment of the sound level in 2 dB (or
perceptible) steps over a 60 dB range. Because
the attenuation is precisely balanced and because
the feedback assures equal gain in both
the nuisance and hazard of an

Front Panel Controls

S
over
channel
allow
sources to be reproduced
or both (MONO
with a null at 10
frequency cut­
Introduces a
position.
flat 18 dB/octave cut­
attenuator allows adjust-
of
of
both
78 rpm
2-1

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