Harman Kardon PM665Vxi
The Harman Kardon PM665Vxi is a serious integrated amplifier from a period when the company was leaning hard into its high-current, wide-bandwidth engineering philosophy. The record on this model is decent on paper but thin on reception. What it was built to do is known. How it was received, and what it cost when new, is not.
The PM665Vxi is a dual-mono design with two separate power supplies and two toroidal transformers. Each channel draws from 35,000 µF of filter capacitance. It is rated at 100 watts per channel (RMS), with a claimed high instantaneous current capability of ±45 Ampere per 5 ms. That is the headroom that lets an amp handle difficult speaker loads. The signal path is DC-coupled and symmetrical, and the bandwidth stretches to 5-200 kHz, which was very much the Harman Kardon talking point of the era. A damping factor above 100 and THD round out the headline specs.
The front panel has bass and treble controls with a bypass switch, plus a direct mode for a cleaner signal path. A switch drives two pairs of speakers at once, which the German source says it does "mühelos" - effortlessly. HiFi-Stereo (February 1988, p.121) listed the PM665Vxi in its amplifier roundup. It noted inputs for MM and MC phono, tape, A/V AUX, CD player, and tuner, along with dual rec-out selectors and two-way dubbing.
Physically, it's a substantial piece: 440 x 128 x 330 mm and 12 kg. The frequency response is rated from 1 Hz to 190 kHz, and input sensitivity is 1.0V. The record has gaps. There is no original retail price, no production years, no signal-to-noise figure, and no phono-stage sensitivity spec. Despite the magazine listing, there are no documented owner impressions or collector price points in the accessible material.
- Type: Integrated amplifier, dual-mono
- Power: 100W RMS per channel
- Bandwidth: 5–200 kHz (power amp); 1 Hz–190 kHz (overall)
- THD: conflicting specs (0.01% vs 0.04%)
- Damping factor: >100
- Current capability: ±45A / 5 ms (HCC)
- Power supply: 2 toroidal transformers, 2 x 35,000 µF
- Dimensions: 440 x 128 x 330 mm; 12 kg
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