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VTPH-1 Vacuum Tube Phono Preamplifier

VTPH-1 Front Panel
front panel
VTPH-1 Back Panel
rear panel

The VTPH-1 is available in two models:

Design Considerations

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.