Accuphase P-4200 (production years not documented)
Little is documented about the Accuphase P-4200 in the way of hard numbers. No production years, dimensions, or complete specification sheet survive in the available record; the model shows up in Accuphase model lists and in a handful of dealer and auction listings. Most of what we know comes from the amplifier's own user manual.
The manual identifies it as "The Stereo Power Amplifier P-4200" and describes it as based on the P-4100 — a full model change with enhanced overall circuitry — while incorporating the design technology of the A-200, the commemorative amplifier Accuphase released for its 40th anniversary. On the circuit side, the P-4200 uses Accuphase's MCS+ topology, a refinement of the Multiple Circuit Summing principle in which identical circuits are connected in parallel. MCS+ extends that parallel operation to the class-A drive stage of the current/voltage converter, which according to the manual lowers the noise floor further. The amplifier combines this with current feedback — using the output signal current rather than voltage for the feedback path — and the manual cites an instrumentation-amplifier configuration throughout, with fully balanced signal paths from the inputs onward and a gain control that minimizes residual noise.
The manual is descriptive rather than numeric: no power output, THD, frequency response, or S/N figures appear in the documented record. The only concrete performance claims come from a private seller, who listed a USA-spec (110 V) example as stable into 1 ohm at 500 watts and bridgeable to 1,000 watts into 2 ohms, and praised it as fantastic-sounding, beautiful, and powerful. That's a compliment, not a review — no independent, period-press evaluation of the P-4200 has surfaced.
On the used market, asking prices have appeared around $3,990 and $5,600. Beyond that, the P-4200 remains one of the more thinly documented amplifiers in Accuphase's lineup.
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