Superb sounding tube preamplifier from Audio Research. Sonically perfect and cosmetically in excellent condition.
Frequency response: ± .5dB, 1.0Hz to 100kHz -3dB points below 0.1Hz and above 300kHz
Distortion (THD): Less than .01% at 2V RMS output. (Typically .005% in midband)
Noise & hum: 15µV RMS maximum IHF weighted noise at main output with gain control minimum (more than 102dB below 2V RMS output)
Main output - 13dB unbalanced
Tape output - 0dB
Input impedance: 100K ohms.
Output impedance: 200 ohms main output. Recommended load 60K ohms and 100pF (20K ohms minimum and 1000pF maximum)
Maximum inputs: 20V maximum
Rated outputs: 2V RMS 1Hz to 100kHz, all outputs, 60K ohm load (maximum output 25V RMS at 1/2% THD into 100K ohms)
Power supplies: Electronically-regulated low and high voltage supplies. Line regulation better than .01%
Tube complement: (4) 6922/E88cc dual triode
Power requirements: 100-135VAC 60Hz (200-270VAC 50/60Hz) 25 watts minimum
Inputs (5): tape, tuner, CD, video, aux
Controls: Gain, input selector
Toggle switches: power/off, mute/operate
Dimensions: 48 cm W x 13.4 cm H (standard rack panel) x 26 cm D. Handles extend 3.8 cm forward of front panel. Rear chassis fittings extend 1.3 cm.