Advertisement
Herron Audio Vacuum Tube Stereo Preamplifier
Design Considerations
Design Considerations
• Perfect tracking volume 166 step control system with unprecedented
precision and dynamic range
• Infinite resolution indirect signal path balance control
• All-tube design operated conservatively for long life
• Relay input switching eliminates switching distortion
• Star grounding for low interference susceptibility and clean signal path
• Zero feedback—no feedback loops in the audio circuitry
• Super-low noise
• High input signal capacity without overload; see technical specifications
• Gold plated TIFF RCA and ground connectors
• Hand-picked components for accurate response and consistent unit-to-unit
quality
• Automatic muting at startup and shutdown
• 72,000 µF of power supply energy storage capacitance
• 4 levels of high voltage regulation
• Regulated soft-start DC filament supply
• Regulated tube bias supply
• Toroidal power transformer
• Rugged 0.10" thick aluminum chassis with 0.25" thick heavily anodized
faceplate
• Reversing power line (AC) polarity switch for minimizing line-to-chassis
reactive currents and noise pickup
• Controlled warm-up of tube filaments and high voltage for extended tube life
• Low plate operating currents for extended tube life and cool operation
• Front panel indicators for power, filament voltage, and output/mute/
monaural
• Each unit is given an extensive burn-in, including rigorous bench and
listening tests
four
Owner's Manual
Front Panel Features
Front Panel Features
Automatic Mute and LED
Indicators
The VTSP-1A/166 features a fully
functional front panel capable of a
wide range of signal control and
easily-monitored operational readi-
ness of the unit. When the
VTSP-1A/166 is powered up, the
automute feature is engaged until
the unit is ready for operation. The
first indicator on the panel is the
POWER LED, which indicates the
unit has been turned on. After a few
moments, the FILAMENTS LED
gradually brightens, as the voltage to
the filaments slowly increases. When
the unit is ready to operate, the
OUTPUTS LED comes on and the
automute is disengaged allowing sig-
nal to be passed to the main outputs.
This process generally takes about a
minute, but can take a little longer if
the unit has not been operated for
an extended period of time. This
controlled start-up process helps
maintain the high level of perfor-
mance of the VTSP-1/166 and
Please read the Owner's Manual completely BEFORE operating the unit.
greatly prolongs tube life while
protecting sensitive connected
components.
Selector Switch
The five-position Selector switch is
used to choose the input signal, and
remotely activates special sealed
relays used to connect the input sig-
nal to the preamplifier's circuitry.
The five positions in the Selector
switch are:
• AUX 1
• AUX 2
• CD
• TUNER
• VIDEO
The selector switch positions cor-
respond with the identically named
inputs on the back panel.
If you have a phono preamplifier,
such as the Herron Audio VTPH-1,
we recommend that you connect it
to the AUX 1 input, which is conve-
niently located next to the
five
Advertisement
