Audio Research Reference phono preamplifier Specifications
Description: Vacuum-tube phono preamplifier. Tube complement: eleven 6922/E88CC, one 5AR4, one 6L6GC, one 6992 in power supply. Frequency response/RIAA accuracy: ±0.15dB of RIAA, 10Hz–60kHz; 3dB points below 1Hz and above 250kHz. Voltage gain: 48dB (low), 69dB (high) at 1kHz. Input impedance: 280 ohms (High Gain); 47k ohms (Low Gain). Hum and noise: 0.56µV equivalent input noise, IHF weighted, shorted (low gain) input (65dB ref. 1mV 1kHz input); 0.055µV equivalent input noise (high gain) (65dB ref. 0.1mV 1kHz input). Distortion: 0.005% at 500mV RMS output at 1kHz. Output impedance: 200 ohms unbalanced. Recommended load: 50k–100k ohms in parallel with 100pF (10k ohms minimum and 2nF maximum). Rated output capability: 500mV RMS (10Hz–60kHz) into 100k ohms (maximum output capability is 30V RMS output at 0.5% THD at 1kHz).
Dimensions: 19" W by 7" H by 15.5" D. Weight: 28 lbs.
Serial number of unit reviewed: 99001620.
Price: $6495 (2000). Approximate number of dealers: 60.
Manufacturer: Audio Research, 5740 Green Circle Drive, Minnetonka, MN 55343-4424. Tel: (612) 939-0600. Fax: (612) 939-0604. Web: www.audioresearch.com.