Herron VTSP-1a/166 - basically new!

For sale is a mint condition Herron VTSP-1a/166. Though discontinued, this actual unit was built in 2014 and this can be be confirmed by Keith Herron. Not a mark or scratch or anything else for that matter, absolutely perfect. Factory box included, of course. The reviews speak for themselves. Please contact me with any questions you might have, open to possible trades, etc. Thanks and please check out my other ads.

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

SpecificationsTube complement4 x 6922Frequency response1 Hz to beyond 100 kHz, 20 Hz to 20 kHz ±0.1 dB (volume control at 9 o'clock)Volume Control166-position electronic stepped attenuatorVolume TrackingMaximum differential: ±0.1 dB channel to channelOutput impedance100 Ohms nominal at 1 kHzInput impedance100,000 ohmsPower supply72,000 µF of energy storage
4 levels of high voltage regulation
Regulated soft start DC filament supply
Regulated tube bias supply
Toroidal power transformerPower requirementsU.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 blowInput capacity18 Volts RMSOverall dimensions19" wide x 3.5" high x 10" deep