Audio Research

PH9

Name: PH9
Brand: Audio Research
SKU: AUDIO-RESEARCH-PH9

Phono Stage

PH9 provides class leading phono preamplification for the majority of cartridge and turntable combinations.

At a glance

All specifications

Gain: 58 dB at 1 kHz
Output Polarity: Non-inverting
Maximum Input: 80 mV RMS at 1kHz
Noise: 77 dB, shorted inputs

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Overview

PH9 provides class leading phono preamplification for the majority of cartridge and turntable combinations.

A trio of 6H30 vacuum tubes form the core of a simple and clear signal path. A classic Audio Research design, the PH9 revels in the vibrance and vitality with which tube gear excels, yet neutrally portrays the subtlest shadings in cartridge and tone-arm selections with transparency.

About Audio Research

When Audio Research was founded in 1970 by Bill Johnson, he had one goal in mind: to advance the state-of-the-art in music reproduction. Today, Audio Research remains true to its roots as a performance-oriented company driven by proven philosophies and superior design. Many industry observers consider Audio Research one of the true originators of the concept of “high-end” audio, offering an unsurpassed level of performance that can easily be heard and appreciated by all. Over its first half-century, Audio Research has grown from a small operation in the back of Bill’s shop to a modern, self-contained factory with dedicated R&D, testing, manufacturing, quality control, and listening facilities. Manufacturing is done by hand in-house, from the ground up, in our Minnesota facility. (Contact us for a tour if you are near Minneapolis, it’s fascinating to meet the people and see the process in action.) 330M Monoblocks Launched May 2024

All Audio Research products

Features

Five impedance settings
Five different impedance settings allow for cartridge loading, which can be changed on the fly with the included metal remote. Cartridge impedance, tube hours, auto shutdown, and other features are included in the menu system. Since 1970, High Definition has been more than our trademark; it has been our guiding principle for all products. PH9 continues this passion and philosophy, offering the listener stunning playback, great value, and unparalleled long-term support.

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