Audio Research PH9 Phono Stage
Audio Research PH9 Phono Stage
Audio Research PH9 Phono Stage
Audio Research

PH9 Phono Stage

Part of Audio Research’s new and improved ‘Foundation Series’ the PH9 is a seriously impressive valve phono stage which is a fantastic pairing for a wide range of cartridges and turntables.

3 Years


Inside the PH9 lies and impressive trio of 6H30 valves which are the base of a clear signal path designed specifically to produce the cleanest, most transparent phono amplification possible.

The PH9 features five different impedance settings allow for cartridge loading, which can be changed easily with the remote control. Also included in the menu is cartridge impedance, tube hours and the auto shutdown feature.

The Foundation Series continues the Audio Research legacy of high-definition audio which has been their guiding principle for all products.

We chose the PH9 for KJ West One as it takes what was already stunning preamplifier (the PH8) that next step further in terms of clarity and musicality. Combined with the beautiful new appearance of the Foundation Series, this is a very appealing new offering from one of the industry’s best known high-end manufacturers.

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

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

55 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

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).

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%.

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

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.