Audio Research D 80
Documentation on the Audio Research D 80 is thin. The record is a single equipment listing, with no production years and no original price. What is known comes from the specs that survive, and they describe a hybrid design. One 1988 listing places the D 80 in a roundup of contemporary power amplifiers.HiFI-Stereo (1988, p.64).
The D 80 is a hybrid power amplifier. A tube driver stage using two 6DJ8s feeds a MOSFET output stage, with four output devices per channel. Rated power is 80 watts into 8Ω, 140 watts into 4Ω, and 160 watts into 2Ω. The source lists these as "channels 1 and 2" without saying whether that means per-channel or bridged operation, so treat them with care. Frequency response is specified at 20 Hz-20 kHz ±0.25 dB, with THD at ≤0.03% and IMD from 0.01%. Slew rate is 20 V/µs, damping factor 30 at 8Ω, input sensitivity 1.2 V for full output, input impedance 50 kΩ, and gain 29 dB. Signal-to-noise is rated at 95 dB. Power consumption is 300 W at 40 W output, and 90 W at idle.
That is about all the record shows. There is no manual, no service literature and no period review. If you have a D 80 or service notes for one, the archive would like to hear from you.
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