VTPH-1 Vacuum Tube Phono Preamplifier
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 front panel  rear panel |
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The VTPH-1 is available in two models:
- VTPH-1MM moving magnet version
- VTPH-1MC Plus moving coil version - same as MM version with additional F.E.T. front end amplifier
Design Considerations
- 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 | 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 | 3 years, parts and labor Tubes: 90 days |
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Herron Audio, div. of Herron Engineering, Inc.
