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Herron Audio Vacuum Tube Stereo Preamplifier
Changing Tubes
Changing Tubes
We do not recommend changing
tubes for the purposes of "improving
sonic performance." Tubes of even
the same part number (6922 in the
case of the VTSP-1A/166) from differ-
ent manufacturers and different
production lots generally vary consid-
erably in many operating parameters.
The Herron VTSP-1A/166 Preamplifier
has been optimized for the tubes that
were supplied by the factory. The orig-
inal tubes should provide many years
of good performance due to the con-
servative plate voltage and current
operating requirements of the Herron
Audio VTSP-1A/166 preamplifier.
If replacement tubes are required,
Herron Audio recommends the use
of our factory matched sets of tubes.
These tubes have been selected for
their superior performance and
have been matched much more
closely than tubes—even from the
CAUTION
CAUTION
CAUTION
! ! ! ! !
When changing tubes, the VTSP-1A/166 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.
twelve
same manufacturer—from other
suppliers.
All tubes in the Herron
VTSP-1A/166 are of the type 6922.
If access to the interior of the
preamplifier is necessary, be sure to
install the grounding lug under the
top screw at the rear of the chassis
when reinstalling the cover.
When changing tubes, the
VTSP-1A/166 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.
CAUTION
CAUTION
CAUTION
Owner's Manual
VTSP-1A/166 Technical Specifications
VTSP-1A/166 Technical Specifications
Tube complement:
4 x 6922
Frequency Response: 1 Hz to beyond 100 kHz, 20 Hz to 20 kHz ±0.1 dB
(volume control at 8 o'clock)
Volume Control:
166 position electronic stepped attenuator
Volume Tracking:
Maximum differential: +/- 0.1 dB channel to
channel
Gain:
14 dB
Input Impedance:
100,000 Ohms
Output Impedance:
100 Ohms nominal at 1 kHz
Absolute Polarity:
Inverting
Power Supply:
72,000 µF of energy storage
4 levels of high voltage regulation
Regulated soft start DC filament supply
Regulated tube bias supply
Toroidal power transformer
Power requirements: U.S.: 120 VAC 60 Hz, 30 VA, Fuse 1/2 amp
250 volt slow blow
Export: 230 VAC 50/60 Hz, 30 VA, Fuse 1/4 amp
250 volt slow blow
Input capacity:
18 Volts RMS
Dimensions:
19" wide x 3.5" high x 10" deep
Warranty:
5 years, parts and labor; 90 days on tubes
Herron Audio
Manufactured by
St. Louis, Missouri
Please read the Owner's Manual completely BEFORE operating the unit.
Division of Herron Engineering, Inc.
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