Audio Research Reference 210

Reference 210 Vacuum tube power amplifier. Incredible tube power and sound for hard to drive speakers. In excellent condition. I HAVE BLACK AND NATURAL FRONT PANELS, you can have both for ultimate flexibility.
These have had a modification - I had a quieter fan put in each amp with a switch (mounted on the back panel) for high and low. Use low for critical listening, keep it in high for regular duty. Both settings are quieter than the original fan. The fans were professionally installed at an authorized Audio Research service center.

www.arcdb.ws/REF210/REF210.
www.theabsolutesound.com/articles/arc-reference-3-linestage-preamp-reference-210-monoblock-power-amp/

Power output 210 watts per channel continuous from 20Hz to 20kHz. 1kHz total harmonic distortion typically 0.5% at 210 watts, below .02% at 1 watt. Approximate actual power available at "clipping" 240 watts (1kHz). Frequency response (-3dB points at 1 watt) 0.5Hz to 240 kHz. Input sensitivity 1.7V RMS Balanced for rated output. (27 dB gain into 8 ohms.) Input impedance 200K ohms Power supply energy storage Approximately 787 joules. Power requirements 105-130VAC 60Hz (260-250VAC 50Hz) 680 watts at rated output, 950 watts maximum, 380 watts at "idle", .15 watts off. Tube complement (3 matched pairs) 6550C (Power output V1-6); (1 matched pair) 6550C (Driver V8-9); 2 - 6N1P (Gain stage V7 and Regulator Driver V10); 1 6550C (Regulator V11). Other Dimensions 19" W x 8.75" H x 19.5" D. Handles extend 1.5" (3.8 cm) forward. Weight 74 lbs. (33.6 kg) Net; 89 lbs. (40.4 kg)
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