VTPH-2 Vacuum Tube Phono Preamplifier Owners Manual
Please read the Owner’s Manual Completely BEFORE operating the unit
13
Increase the volume to a normal
listening level and check for hum.
Reduce the volume to a lower posi-
tion and play a record. Gradually
increase 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.
Place the line stage input selector to
an unused position and change the
AC polarity of the VTPH-2 phono
preamplifier by switching the power
line polarity switch to the “B” posi-
tion. Repeat the process, listening
to the same recording. Place the AC
polarity switch in the position that
sounds best.
Optimum Performance
With higher definition and detail
available in the musical signal,
more careful attention to the set-
up of other components will yield
greater benefits. We have found that
the best place to start is with the
turntable set-up. Adjustments of the
vertical tracking angle will be easy to
resolve using the Herron Phono Pre-
amplifier. Users may gain improved
performance by making fine adjust-
ments. Slight changes in cartridge
tracking force can improve tracking
and position the coils in a cartridge
at the correct position relative to the
magnets.
We recommend that the VTPH-2
be used with a line stage having an
input impedance of 50,000 Ohms or
higher for optimum performance.
Depending on the cartridge output
rating, the line stage may require an
input capacity of as high as 15 volts
rms.
We recommend the use of high qual-
ity interconnecting cables between
the turntable and the phono stage
and between the phono stage and
line stage. It is very important for
achieving best performance from the
VTPH-2 that the cables between the
phono stage and the line stage be a
low capacitance type.
Changing Tubes
When changing tubes, the VTPH-2
should be unplugged and left off
for a minimum of 30 minutes prior
to opening the unit, to insure that
hazardous voltages in the power
supply have time to discharge before
entering the unit.
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