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 5 years, parts and labor
Tubes: 90 days
