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About the REF 110
The Audio Research REF 110 is a high-end stereo tube power amplifier featuring 110 watts per channel continuous output from 20Hz to 20kHz. It uses a push-pull, fully balanced circuit with two matched pairs of 6550C output tubes per channel and a hybrid input stage with direct-coupled JFETs and 6H30 gain and cathode follower tubes. The output stage combines ultralinear and partially cathode-coupled topology for superior sound quality. It offers balanced inputs only, with 300k ohm input impedance and 1.8V RMS sensitivity for rated output. The amplifier includes taps for 4, 8, and 16 ohm speaker loads and features two 12V triggers for remote turn-on. Cooling is provided by two small fans with adjustable speed. The REF 110 is noted for its wide frequency response (0.6Hz to 90kHz), low distortion (0.3% at rated power), and a dynamic, detailed sound with excellent bass control and a wide soundstage. It weighs about 67.4 lbs and measures 19"W x 8.75"H x 19.5"D. The amplifier is no longer in current production but remains highly regarded in audiophile circles.
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