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Herron Audio Vacuum Tube Stereo Preamplifier
Rear Panel Features
Rear Panel Features
The rear panel was designed for flexibility and ease of access to less-fre-
quently used functions. The high precision RCA input jacks are heavily
gold-plated to minimize signal-degrading corrosion. The special insulation
material in the RCA connectors maintains purity of the signal from the input
cable into the unit.
Power Connection
An IEC power cord connector is pro-
vided for attaching the Herron
Audio-provided power cord or
another chosen by the user.
POWER Switch
This is the unit's POWER switch.
When placed in the on position, the
unit is powered up. At power up, the
unit is automatically muted until
full operational capabilities are
reached and the voltages are stable
at the tubes.
When switch is moved to the off
position, the unit is automatically
muted and powered down.
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POWER LINE POLARITY Switch
This switch selects the power line
polarity.
AC line polarity may affect perfor-
mance. The following is the
recommended procedure for deter-
mining the best operation:
• Set the power line polarity switch
to the "A" position.
• Set the volume control to the
desired level and listen closely to
the quality of the reproduction.
This will be used as a baseline for
determining AC polarity.
• Change the AC polarity of the
preamplifier by switching the
power line polarity switch to the
Owner's Manual
"B" position. Repeat the process,
listening to the same source. Place
the AC polarity switch in the posi-
tion that sounds best.
Once set, it is not necessary to
change the AC polarity unless your
electrical service changes, or the unit
is connected to a different electrical
outlet. If the unit is used with the
Herron Audio VTPH-1 phono pream-
plifier, we suggest that both the
VTPH-1 and VTSP-1A/166 use the
same AC polarity switch setting.
Inputs
The inputs are segregated by channel:
the upper bank contains the left
channel inputs, the lower contains
the right channel inputs. Selector
input pairs are arranged vertically.
The labeled input pairs, except for
the pair labeled TAPE correspond to
those available on the selector switch
on the front panel. The input is selec-
table using the TAPE / SOURCE
switch.
RCA input plugs should be
inserted firmly into the input jacks
Please read the Owner's Manual completely BEFORE operating the unit.
while the unit is powered down. Any
individual ground bleed connections
should be connected to the gold
ground lug located near the end of
the banks of input jacks.
It may be desirable to connect a
source's right channel first, followed
by the left.
Outputs
There are two types of outputs in the
VTSP-1A/166. The main outputs are
intended for connection to high
quality power amplifiers or a multi-
channel electronic crossover. Two
pairs of main outputs are provided
so that users may distribute the
audio signal to multiple systems, or
to simplify using multiple amplifiers
in a complex or multi-way speaker
system.
The tape outputs are provided to
allow monitoring of the audio signal
after the selector switch relays. The
signal from the tape output corre-
sponds to the input chosen by the
selector switch.
The operation of the Herron
VTSP-1A/166 Preamplifier is straight-
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