Audio Research PH9 Phono Stage

The PH9 is Audio Research's mainstream phono stage, built around three 6H30 vacuum tubes in a simple, minimal signal path intended to pass through a cartridge and tonearm's own character rather than impose one.

It offers five remote-selectable loading settings along with menu-driven impedance adjustment, tube-hour tracking, and auto-shutdown.

Specifications

• Tubes: three 6H30P signal path, one 6550WE plus one 6H30P power supply
• Gain: 58dB at 1kHz, single gain setting
• Loading: 5 selectable settings, 47k/1000/500/200/100 ohms, remote selectable
• THD: under 0.015% at 3V RMS, 1kHz
• Max input: 80mV RMS at 1kHz, rated output 0.5V RMS (10Hz to 60kHz into 100k ohms)
• Dimensions: 19 in W x 6.5 in H x 13.7 in D
• Weight: 15.4 lbs