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Herron Audio Vacuum Tube Stereo Preamplifier
GROUND terminal on the back
panel. The selector switch indicates
the signal source that is used for the
TAPE OUT on the back panel and
also the MAIN 1 and MAIN 2 out-
puts (when the TAPE / SOURCE
switch is in the source position).
TAPE / SOURCE Switch
The TAPE / SOURCE switch is
located below and to the right of
the selector switch. This switch con-
trols the preamplifier main output
source. When the switch is in the
SOURCE position, the selector
switch determines the signal used
for both tape and main outputs.
When the switch is in the TAPE
position, the signal entering the
inputs labeled TAPE on the back
panel is used as a source for the
Main Outputs.
The TAPE / SOURCE switch can
also be used to support an external
signal processor.
In normal operation, the TAPE /
SOURCE switch is placed in the
SOURCE position.
MONO / STEREO Switch
The MONO / STEREO switch is
located in the middle of the front
panel. When the switch is placed
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in the STEREO position, the left and
right channel signals remain sepa-
rated. When the switch is placed in
the MONO position, the left and
right channels are combined into
a single "summed" signal.
The OUTPUTS LED lights up in a
combination of red and green with
the MONO / STEREO switch in the
MONO position.
In normal operation, the MONO /
STEREO switch is placed in the
STEREO position.
Balance Control
The VTSP-1A balance control pro-
vides a full range of adjustment for
relative balance between the right
and left channels. In the centered
position, each channel is equal in
signal sensitivity. Rotating the bal-
ance control in the clockwise
direction (to the right) decreases the
volume in the left channel
(relative to the right channel).
Rotating the balance control in a
counter-clockwise direction (to the
left) decreases the volume in the
right channel (relative to the left).
In the fully clockwise or counter-
clockwise position, the left or right
channel respectively will be muted.
Normal operation is provided when
Owner's Manual
the balance control is in the cen-
tered position.
Volume Control
The volume control knob of the
VTSP-1A/166 operates a servo that
controls the positions of two (left
and right) electronic stepped
attenuators. This unique design
provides the feel of a conventional
volume control and the benefits of
much lower distortion and better
tracking from a unique state of the
art electronic 166 step volume
attenuator. Rotating the control
clockwise increases the volume;
rotating the control counter-clock-
wise decreases the volume. Its
unique operation and integration
into the VTSP-1A/166 contributes
to this preamplifier's outstanding
performance.
Occasionally, due to static dis-
charge, the channel-to-channel
tracking may require adjustment.
An automatic servo reset is easily
initiated by placing the Mute/Listen
switch in the MUTE position, then
returning it to the LISTEN position
or by turning the volume control
fully counter-clockwise (against
the stop) and returning it to the
desired level.
Please read the Owner's Manual completely BEFORE operating the unit.
Step changes during adjustment
of the volume control will be most
audible for a short period of time
just after the line stage or selected
input equipment is powered on.
Normally these step changes may be
heard at roughly the 8:30 o'clock
position and at high volume set-
tings. Though not necessary, it is
good operating practice to adjust the
volume control to its lowest setting
when switching inputs or when
powering up or powering down
the preamplifier.
MUTE / LISTEN Switch
The Mute/Listen switch is located
below and to the left of the LEDs.
This switch controls the muting of
the main outputs (but does not mute
the tape outputs). When in the
LISTEN position, the signal is passed
to the main outputs directly. When
in the MUTE position, the signal
is disconnected from the main
outputs, and the volume is
automatically turned down.
The OUTPUTS LED glows red
when the switch is in the MUTE
position.
In normal operation, the
MUTE / LISTEN switch is placed
in the LISTEN position.
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