Acoustic Research AU

Solid-state integrated amplifier produced from 1968-1971, featuring 50 watts per channel into 8 ohms (60W into 4 ohms), direct-coupled design with simplified control layout emphasizing functionality over features. Marketed as the AR Amplifier, this model is notable for excellent sound quality and robust construction with minimal protective circuitry. Specifications include 20Hz-20kHz frequency response, 0.25% THD, damping factor of 40, and 2mV phono/200mV line sensitivity.

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