The PH3 is a phono preamplification stage intended for use with an active line-level stereo preamplifier. Fully single-ended from input to output, the PH3 uses a combination of J-FET input stage technology (for low inherent circuit noise) and class A operation vacuum-tube gain via three 6922 twin triodes. Total gain of the PH3 is 54 dB (non-adjustable). Used with typical line preamplifiers having 12 to 18 dB of gain, the PH3 is suitable for phono cartridges having .25 mV output or higher. Input impedance is factory-set at 47K ohms, and input capacitance at 90 pF. For optimal matching to moving-coil and moving-magnet phono cartridges, both input impedance and input capacitance may be adjusted via simple resistor and capacitor changes.Frequency response ±.15dB of RIAA, 10Hz to 60kHz; 3dB points below 0.5Hz and above 400kHz
Distortion (THD) Less than .005% at .50V RMS 1kHz output
Noise & hum 0.1µV equivalent input noise, IHF weighted, shorted input (80 dB below 1mV 1kHz input)
Gain 54dB at 1kHz (MC & MM compatible)
Input impedance 47K ohms and 90pF Unbalanced. (Provisions for any value below 47K ohms or added input capacitance for matching certain magnetic cartridges.)
Output impedance 200 ohms Unbalanced. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum.)
Maximum inputs 60mV RMS at 1kHz (240 mV RMS at 10kHz)
Rated outputs .50V RMS 10Hz to 60kHz, 100K ohm load (output capability is 30V RMS output at 1/2% THD at 1kHz).
Power supplies Electronically-regulated low and high voltage supplies. Line regulation better than .01%
Tube complement (3) 6922/E88cc dual triodes
Power requirements 100-135VAC 60Hz (200-270VAC 50/60Hz) 28 watts maximum. Line fuse 0.6A SLO BLO (0.3A SLO BLO 230V)
Dimensions 19" (48 cm) W x 5.25" (13.4 cm) H (standard rack panel) x 10.25" (26 cm) D. Handles extend 1.50" (3.8 cm) forward of front panel. Rear chassis fittings extend .75" (2.2 cm)
Weight 10 lbs. (4.5 kg) Net; 19 lbs. (8.6 kg) Shipping. Retailed at $2595. Make a reasonable offer and start to enjoy your analog again! PayPal and shipping charges extra.
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