Harman Kardon PM640Vxi (1980s–1993)
The Harman Kardon PM640Vxi is a stereo integrated amplifier from the late 1980s to early 1990s. It was sold as a “High Voltage/High Current Integrated Amplifier.” The owner’s manual opens with congratulations on the purchase. Surviving units, many of them marked “Made in Japan,” still turn up on auction sites, often described as rare or powerful. One long-term owner reports having held onto theirs for thirty years through moves and travels.
Documentation on the PM640Vxi is thin. The manual confirms the high voltage/high current design philosophy, but the extracted text gives no numeric figure for continuous average power. Power output is cited at 45 watts per channel into 8Ω in one source. Another lists 70 watts per channel into 4Ω, and a Catawiki listing claims approximately 2 × 60 watts into 8 ohms. These figures conflict, so treat them as approximate. Channel separation is documented at 58dB (MM) and 67dB (line). A remote control was included as an accessory.
The PM640Vxi is sometimes described as featuring High Instantaneous Current Capability (HCC) technology. Be careful with that claim. The HCC label more reliably goes with the earlier, different PM640 model from 1983-84, and the sources don’t clearly confirm it for the Vxi variant.
Little else is firmly recorded. No frequency response, distortion, or signal-to-noise figures survive in the accessible record, and there are no dimensions, weight, or original price. Production years are given variously as 1987, 1987-88, and 1992-93. The sources disagree, and no authoritative date has surfaced.
- Type: Stereo integrated amplifier
- Power: ~45W/ch into 8Ω (one source); ~70W/ch into 4Ω (another); figures conflict
- Channel separation: 58dB (MM), 67dB (line)
- Accessories: Remote control
- Made in Japan
Similar items on eBay
No exact Harman Kardon PM640Vxi listings are live right now — these searches show current Harman Kardon and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.
Related Models
- Harman Kardon 730 (1973-1979)
- Harman Kardon A-401
- Harman Kardon A 402
- Harman Kardon A660
- Harman Kardon Citation 16
- Eico 3150 (1967)
- Fisher CUSTOM-ELECTRA-I (K-14/K-15) (1957)
- Fisher CUSTOM-ELECTRA IV (E33/E44) (1960)
- Akai AM-2400 (1978)
- Akai AM-2600 (1977)