Audio Research PH9 Phono Stage Preamplifier

The PH9 phono preamplifier delivers high-performance analog playback for a wide range of cartridges and turntables. Built around three 6H30 vacuum tubes, it features a simple, transparent signal path that combines tube warmth and musicality with excellent detail and neutrality. Five selectable impedance settings allow easy cartridge matching and can be adjusted remotely during playback. Additional features include tube hour tracking, auto shutdown and menu-based controls. Continuing Audio Research’s long-standing commitment to “High Definition” sound, the PH9 offers engaging, dynamic vinyl reproduction, strong value and dependable long-term support for serious music listeners.

Technical Specifications: 

Frequency Response: ±.2 dB of RIAA, 5 Hz to 20kHz; 1 dB points below 0.3Hz and above 80 kHz

Distortion: Less than .015% at 3V RMS 1kHz output

Gain: 58 dB at 1 kHz

Input Impedance: Selectable loads: 47k, 1000, 500, 200, 100 Ohms

Output Impedance: 200 ohms. Recommended load 50k-100k Ohms and 100 pF. (10k Ohms minimum and 2000 pF maximum).

Output Polarity: Non-inverting

Maximum Input: 80 mV RMS at 1kHz

Rated Outputs: 0.5V RMS 10 Hz to 60 kHz, into 100K ohm load (maximum balanced output capability is 0.46V RMS at less than 0.5% THD at 1kHz)

Controls: 6 Push Buttons:   Power, Menu, Option, Enter, Input, Mute

Power Supplies: Electronically regulated low and high voltage supplies.   Automatic 2 minute warm-up/brown-out mute. Line regulation better than .01%

Noise: 77 dB, shorted inputs

Tube Complement: (3)-6H30P dual triodes, plus (1 each) 6550WE and 6H30P in power supply

Power Requirements: 100-125VAC 60Hz (200-250VAC 50/60Hz) 120 watts maximum. Standby: 2 watts

Dimensions:

Width: 19” (48 cm)
Height: 6.5” (13.7 cm)
Depth: 13.7” (34.8 cm)
Handles: extend 1.6” (4 cm) forward of the front panel
Weight: 15.4 lbs. (7 kg) Net; 23.5 lbs. (10.7 kg) Shipping