VTPH-1MM

About the VTPH-1MM

The Herron Audio VTPH-1MM is a vacuum tube phono preamplifier optimized for moving magnet cartridges, featuring an all-tube signal path with four 12AX7WA/B tubes and one 12AT7WC tube. It delivers a nominal gain of 44dB at 1 kHz with channels matched within 0.05 dB. The unit provides a wide frequency response from 1 Hz to beyond 100 kHz, with RIAA accuracy of ±0.1 dB from 20 Hz to 20 kHz. It has a signal-to-noise ratio of 80 dB (A-weighted) and an output impedance of 500 ohms nominal, with a recommended load of 50 k ohms or higher. The input impedance is 47,000 ohms with 100 pF capacitance. The power supply includes 78,000 µF of energy storage, four levels of high voltage regulation, a regulated soft start DC filament supply, and a regulated tube bias supply, powered by a toroidal transformer. The chassis measures 19" wide x 3.5" high x 10" deep and weighs approximately 14 to 20 pounds. The unit is known for its musicality, detail retrieval, and full frequency response without global feedback, making it a world-class phono stage for audiophiles.