Accuphase P-4500

Surviving information on the Accuphase P-4500 is thin. It doesn't turn up in the period reviews the Archive usually draws on, no original brochure or manual text has surfaced in our research, and production years, original pricing, and full specifications remain unrecorded. What is known comes mainly from the Stereoindex entry and a service-manual listing site.

The P-4500 was a high-quality, high-precision Class A stereo power amplifier — described as a complete redesign of its predecessor, the P-4200, with an improved overall design and incorporating technology from the flagship A-200. The front panel carries a gain reduction control (0, −3, −6, −12 dB), a mode switch for Stereo, Dual Mono, or Bridged operation, and switching for two pairs of speakers. The circuit is fully symmetrical, and the output stage uses high-power MOSFETs: three pairs of transistors per channel, rated at 220 watts, in a parallel push-pull configuration to keep output impedance low.

Beyond that, the record stops. Power output figures, frequency response, THD, dimensions, and weight are not documented in the available sources. If the manual ever surfaces, there's a proper page waiting to be written.