HERRON AUDIO - VTPH-1 MC TUBE PHONO PREAMPLIFIER
HERRON/VTPH-1 MC PHONO PREAMPLIFIER
This phono preamp has been named a Stereophile Class A Recommended Component an incredible six (6) times! This tube phono preamp has consistently been reviewed as one of the best of the best for several years. The unit has an amazing number of high quality features: star grounding, gold plated Tiff and RCA connectors, power polarity switch, absolute polarity switch, controlled warm-up for extending tube life, hand picked and matched components, automatic muting at startup and shutdown, and toroidal transformer. If you are looking for a phono preamp that will make your system sing with joy, this is the unit for you! Moving Coil version.
'It's competitive with anything I have rated 'Class A.''
- Michael Fremer, Stereophile
'It was a pleasure to measure such a well-engineered phono stage.'
- John Atkinson, Stereophile
Features:
All tube signal path (moving magnet version)
Passive RIAA equalization
Star grounded
Zero feedback
No switches in signal path
Gold plated TIFF ground and RCA connectors
Reversing line polarity switch
Controlled warm-up (filaments and high voltage) for extended tube life
Low plate operating currents for extended tube life and cool operation
Audio path capacitors are polypropylene and polystyrene
Hand picked components for accurate response
Automatic muting at startup and shutdown
Toroidal power transformer
Rugged all-1/10 inch thick aluminum chassis, 1/4 inch thick faceplate
Front panel indicators for power, filament voltage, and output mute release
Each unit given a 48-hour burn in, including rigorous bench and listening tests
Specifications:
Tube complement 4 x 12AX7, 1 x 12AT7
Frequency response
RIAA 1 Hz to beyond 100 kHz, 20 Hz to 20 kHz ±0.1 dB
Gain 150 watts @ 8 ohms, 275 watts @ 4 ohms (measurements at 1 khz)
Gain:
VTPH-1MM 44 dB nominal at 1kHz, channels matched to within 0.05 dB
VTPH-1MC Plus 66 dB nominal at 1kHz, channels matched to within 0.05 dB
Signal-to-Noise Ratio
VTPH-MC Plus 80 dB, A weighted, inputs shorted, AC polarity set
Output impedance 500 ohms nominal
Input impedance:
VTPH-1MM 47,000 ohms, 100 pF
VTPH-1MC Plus 47,000 ohms, 100 pF, plus optional internal load resistors at the input terminals
Absolute polarity VTPH-1MM non-inverting
VTPH-1MC Plus non-inverting
Power supply
78,000 µF of energy storage
4 levels of high voltage regulation
Regulated soft start DC filament supply
Regulated tube bias supply
Input capacity
VTPH-1MM up to 300 mV at 1 kHz, 1 volt at 10 kHz nominal (output unloaded)
VTPH-1MC Plus up to 30 mv at 1 khz, .1 volt at 10 kHz nominal (output unloaded)
Overall dimensions 19' wide x 3.5' high x 10' deep
Warranty 5 years, parts and labor
Tubes: 90 days
