Accuphase P-360 (1991)

Name: Accuphase P-360
Brand: Accuphase

Stereo power amplifier released in March 1991 with 400W/ch into 2Ω and advanced MOS FET + cascode drive topology.

Overview

The Accuphase P-360 is a high-power stereo amplifier developed as a successor to the P-300 series, released in March 1991 by Accuphase Laboratory, Inc. It delivers 400W per channel into 2Ω in stereo mode and can be bridged for monophonic operation, providing up to 800W into 4Ω. The design features a symmetrical layout consistent with other Accuphase power amplifiers, with extensive use of FETs and transistors—63 transistors, 32 FETs, 10 ICs, and 77 diodes—across its circuitry.

Specifications

Model	Accuphase P-360
Production Year	Released March 1991
Power Output (Stereo)	400W/ch (2Ω), 300W/ch (4Ω), 200W/ch (8Ω), 100W/ch (16Ω)
Power Output (Monophonic Bridge)	800W (4Ω), 600W (8Ω), 400W (16Ω)
Harmonic Distortion	0.02% (2Ω–16Ω, stereo); 0.02% (4Ω–16Ω, monophonic)
IM Distortion	0.003%
Frequency Response	20Hz–20kHz (+0, -0.2dB); 0.5Hz–160kHz (+0, -3.0dB at 1W)
Gain	28.0 dB (stereo and monophonic)
Damping Factor	300 (stereo), 150 (monophonic bridge)
Input Sensitivity (8Ω)	1.59V (stereo full output), 2.76V (monophonic full output)
Input Impedance	Balanced: 40kΩ, Unbalanced: 20kΩ
S/N Ratio	120 dB (input short), 100 dB (1kΩ source, 1W output)
Headphone Impedance	4Ω–1000Ω
Power Supply	100V, 117V, 220V, 240V (50/60Hz)
Power Consumption	No signal: 100W; Rated output (8Ω): 633W
Transformer	1000VA toroidal
Capacitance	40,000μF/80V × 2
Dimensions	475mm W × 180mm H (incl. legs) × 409mm D
Weight	27.4 kg

Design

The P-360 uses a symmetrical design shared across Accuphase's power amplifier series, with a MOS FET + cascode push-pull circuit in the drive stage and bipolar transistors in the output stage. The output devices employ 7-parallel push-pull transistors per channel, capable of delivering 210A within 1ms. The predriver operates in class A cascode push-pull configuration, and the input uses a direct-coupled balanced differential complementary push-pull stage with FET input buffers. DC servo circuitry prevents DC amplification. Level control is handled by a 1-dB stepped double attenuator with mirror-finished resistors for low distortion. The input selector switches between one balanced and two unbalanced inputs, with front-panel access for one unbalanced RCA. Speaker outputs can be switched or paralleled. A dedicated headphone amplifier with FET servo control isolates the main circuit. The front panel features a gold power button and conceals controls behind a flap, including headphone jack, input selector, and speaker switches. Natural persimmon wood side panels and a champagne gold finish complete the chassis.

Context

The P-360 was developed as the successor to the P-300 series and represents a more recent design than both the P-300 and P-500 series models.

Market

Current listings range from €3,200 to €9,000. Units are typically found in very good condition with minor signs of age, including light scratches. Small electrolytic capacitors are known to fail over time, potentially causing DC offset or degraded sound; maintenance usually involves replacing these capacitors, deep cleaning, and electronic calibration. Voltage conversion is possible for international use.

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