audio research
PH1

Description
Solid state stereo phono preamplifier.

Introduced
1992

Discontinued
?

Revisions
-

Options
-

MSRP (US new retail)
$1,495

Specifications

Frequency response ±.25dB of RIAA, 10Hz to 60kHz. 3dB points below 0.5Hz and above 150kHz
Distortion (THD) Less than .005% at .25V RMS 1kHz output
Noise & hum 0.12µV equivalent input noise, IHF weighted, shorted input (78dB below 1mV input)
Gain 48dB at 1kHz (MC and MM compatible)
Input impedance 47K ohms (Provisions for any value below 47K ohms or added input capacitance for matching certain magnetic cartridges)
Output impedance 350 ohms. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum)
Maximum inputs 160mV RMS at 1kHz (800mV RMS at 10kHz)
Rated outputs .25V RMS 10Hz to 60kHz, 100K ohm load (output capability is 50V RMS output at ½% THD at 1kHz)
Power supplies Electronically-regulated low and high voltage supplies and electronic decoupling. Shielded toroid transformer. Line level regulation better than .01%
Power requirements 100-135VAC 60Hz (200-270VAC 50/60Hz) 35 Watts
Other Swithes: Power, Mute
Dimensions 19" (48 cm) W x 5¼" (13.4 cm) H (standard rack panel) x 10¼" (26 cm) D. Handles extend 1 5/8" (4.1 cm) forward of front panel. Rear chassis fittings extend 7/8" (2.3 cm)
Weight 10 lbs. (4.5 kg) Net; 19 lbs. (8.6 kg) Shipping

Reviews

Vol. 15 No. 11

Pictures