Audio Research PH9
Audio Research PH9
Audio Research PH9
Audio Research PH9
Audio Research PH9
Audio Research PH9

Audio Research PH9

PH9 Foundation Series Vacuum-tube Phono Preamplifier

As enthusiasm for vinyl has rebounded in recent years, it is important to remember that we’ve never abandoned our support for the medium, from the on-board phono stages built into our SP-series starting in 1970, to the separate PH-series beginning in 1992. The vacuum tube PH9, is the latest in this series of high performance phono stages offering new insight into what is buried in those glorious grooves.

With three high current 6H30 tubes, the PH9 provides higher transconductance, better dynamics, and better sound. With a new copper-wrapped R-core transformer and a larger, higher-current power supply, the sound is more powerful and dynamic, with deeper and tighter bass and greater musical authority. As in the Reference Phono 3, the PH9 also has vacuum-tube regulation in its power supply, using a 6550 and a 6H30.

With a gain of 58 dB, and loading options of 100, 200, 500, 1000 and 47k ohms, a very wide variety of phono cartridges can be accommodated. The single-ended RCA inputs and outputs assures compatibility with almost any system, and its low output impedance gives the PH9 the ability to drive long interconnects.