Herron VTPH-1

The Herron VTPH-1 is a pretty straightforward and extremely well-executed design: all tube, star grounded, and zero feedback. The RCA and ground connectors are gold plated, the AC cord is detachable, and there is a power-line-polarity switch on the back panel -- a nice touch. Cartridge loading is accomplished via resistors soldered to the input connectors, so there are no switch contacts to corrode over time. The tube complement is four 12AX7WA/Bs and one 12AT7WC. Herron Audio quotes the frequency response at 1Hz to beyond 100kHz (as reported by the bats!). Gain is 44dB for moving-magnet use, 66dB if set up for moving-coil cartridges. The output impedance is 500 ohms nominal (50k ohms or higher recommended load), and the input impedance is 47,000 ohms and 100pF (plus optional loading resistors). The VTPH-1's dimensions are 19"W x 3.5"H x 10"D, and its weight is 20 pounds.

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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 66 dB nominal at 1kHz, channels matched to within 0.05 dB
Signal-to-Noise Ratio

VTPH-MC 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 47,000 ohms, 100 pF, plus optional internal load resistors at the input terminals
Power supply

78,000 uF 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 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