Harman Kardon PM660 (1982–)
The Harman Kardon PM660 is an integrated amplifier introduced in 1982 — a model that appears in the period record but whose documentation is thin. What survives comes mostly from the owners who bought one and kept it for decades, and their reports are remarkably consistent.
The specs that are documented: 60 watts per channel into 8 ohms, 85 watts into 4 ohms, with a damping factor of 100 and output impedance of 0.08 ohms. Input sensitivity is rated at 2.5mV for MM phono and 150mV for line. Signal-to-noise is 80dB (MM) and 100dB (line). It measures 440 x 121 x 343mm and weighs 8.5kg. An optional wood casing was available. HiFI-Stereo (July 1982, p.34) included the PM660 in its equipment test coverage that month, publishing reference power measurements. No original retail price survives in the record.
What the owners say matters more than the spec sheet. One forum member bought his PM660 new in 1982 and used it daily as his main amp for 25 years with zero problems. Another purchased one in 1983 and reports it in continuous use for decades, still working perfectly. A third owner describes the sound as "very musical," while another calls it "warm, detailed." The build quality draws consistent praise — "built like a tank" is the phrase one long-time owner uses. No negative reviews or failure reports surfaced in any source.
The hifiengine entry lists a related model, the PM660VX, with higher power (75W/8ohm, 110W/4ohm). These are distinct models — the PM660VX specs should not be conflated with the PM660's. Beyond that, almost nothing is documented: no circuit topology, no THD figures, no frequency response ratings, no production end date. The PM660 appears to have been a solid, reliable, good-sounding integrated amp that satisfied its owners for a quarter-century or more — and then quietly slipped out of the historical record.
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