Tube Power Amp Reviews

Description: Vacuum-tube monoblock power amplifier. Tube complement: two matched 6550 pairs (output), two 6550 regulators, one 12AX7 regulator, four 12BH7A driver, two 6922 input. Power output: 130W continuous into 16 ohms (24.2dBW), 20Hz–20kHz, with <1% THD (typically !x0.05% at 1W). Approximate power available at clipping: 145W at 1kHz (24.6dBW). Power bandwidth (–3dB): 12Hz–80kHz. Input sensitivity: 2.3V RMS balanced for rated output. Input impedance: 200k ohms. Hum and noise: <0.5mV RMS (98dB below rated output, IHF weighted, input shorted). Power-supply energy storage: approximately 420 Joules. Power requirements: 470W at rated output, 600W maximum, 290W at idle.
Dimensions: 14.5" by 12" H by 22" D (knobs extend 5/8" forward, output connectors extend 1" to the rear). Weight: 62 lbs net, 82 lbs shipping.
Price: $11,990/pair (1994); no longer available (2020). Approximate number of dealers: 65. Warranty: 3 years limited (90 days on tubes).
Manufacturer: Audio Research Corp., Minnetonka, MN 55343-4424 (1994); Audio Research Corporation, 6655 Wedgwood Road N., Suite 115, Maple Grove, MN 55311. Tel: (763) 577-9700. Fax: (763) 577-0323. Web: www.audioresearch.com (2020).