Audio Research Ref 150



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Serial Number: 81106001 Category: Tags: ,


Store display model
stereo vacuum tube amp – demo
150 watts per channel – natural finish

Description: Tubed stereo power amplifier. Tube complement: eight KT120 (matched pairs, output), four 6H30 (driver). Input: Balanced, pin 2+ (IEC-268). Output taps: 16, 8, 4 ohms. Power output: 150Wpc (21.75dBW) continuous, 20Hz–20kHz into matched load. Approximate actual power available at clipping: 160W. Power bandwidth: 5Hz–80kHz, –3dB. Frequency response: 0.5Hz–120kHz, –3dB at 1W. THD at 1kHz: typically 0.6% at 150W, <0.03% at 1W. Input sensitivity: 2.0V RMS for rated output, Voltage gain: 24dB into 8 ohms. Input impedance: 300k ohms, balanced. Output polarity: non-inverting. Output regulation: approx. 0.6dB 16 ohm load to open circuit (damping factor: approx. 14). Overall negative feedback: 14dB. Slew rate: 13V/µs. Risetime: 2.0µs. Hum and noise: <0.1mV RMS, 114dB below rated output (IHF weighted, input shorted). Power-supply energy storage: approx. 1040 joules. Power requirements: 105–125VAC, 60Hz (210–250VAC, 50Hz), 730W at rated output, 900W maximum, 420W idle.

Additional information


Audio Research






Reference 150


B-Stock (9/10)

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