Marantz PM-6 (1985)

Name: Marantz PM-6
Brand: Marantz

The Marantz PM-6 is an integrated stereo amplifier introduced in 1985. Ken Ishiwata designed it as the follow-up to the PM-4, using the better parts and technologies from that earlier model. It's a 75-watt-per-channel design (into 8 ohms, 20-20,000 Hz, both channels driven) rated at less than 0.05% THD with a signal-to-noise ratio of 95dB. Multiple sources corroborate those figures.

The PM-6 stands out in the Marantz line for its construction. It uses a discrete 4-layer printed wiring board, semi-pure regulated power supplies for each stage, and LAPT (Linear Audio Power Transistor) output devices. A single Mitsubishi MC1 op-amp on the main output stage handles getting the signal from the board to the output stage. The layout is described as "straight-forward and logical," and the direct input frequency response runs from 10Hz to 100kHz at ±0.5dB. Input sensitivity is 2.8mV for phono (47kΩ) and 150mV for line-level sources (25kΩ), and it will drive 4-16Ω loudspeakers. Dimensions are 440 x 160 x 390mm, and it weighs 14.5 kg.

The PM-6 got some criticism. Some found its presentation forward, noted a slight lack of grip at high volumes, and observed that the internal build wasn't as tidy as some competitors. Long-term owners report the volume control can become noisy with age. The amplifier uses 2x 20mm TR5 fuses, which are sometimes described as marginal. One owner's summary: "If vintage warmth and huge soundstage are what you need then the PM6 is ideal."

No original retail price is documented, and beyond the 1985 introduction date, production years aren't confirmed. Spare parts availability and current market pricing are likewise undocumented in the archive's sources.