Accuphase A-36 Class-A Power Amp



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Redefining Essential Excellence

Pure Class A amplifiers from Accuphase have a long and distinguished tradition and have attained widely acclaimed levels of performance combined with reliability and impeccable sound quality. Audiophiles the world over continue to hold them in high esteem. The Pure Class A Monophonic Power Amplifier A-200 introduced on the occasion of the company's 40th anniversary, and the high-end Pure Class A Stereo Power Amplifier A-70 opened up new realms of sonic excellence and have become legendary as reference audio devices. The new A-36 inherits many of the outstanding design technology features developed for the higher-end models. It redefines the baseline for pure class A power amplifiers and represents the same unwavering attention to detail and dedication to sound quality for which Accuphase is justly famous.

Latest instrumentation amplifier topology allows the realization of fully balanced signal paths, while the MCS+ circuitry combined with current feedback topology and carefully selected high-grade materials assure further enhanced performance and sound quality. In the output stage, power MOS-FETs renowned for their excellent frequency response, sonic performance, and superior reliability are used in a triple parallel configuration and driven in pure class A. This is sustained by the strong power supply featuring a massive transformer and two large 47,000 μF filtering capacitors. Output power in each channel is rated for an impressive 150 watts into 1 ohm, 120 watts into 2 ohms, 60 watts into 4 ohms, and 30 watts into 8 ohms. Even speakers with ultralow impedance or drastic fluctuations in impedance curve can be driven reliably by this impressive amplifier.

Further refined MCS+ topology for even lower noise

Accuphase’s original MCS (Multiple Circuit Summing) principle uses a number of identical circuits connected in parallel to achieve superior performance characteristics. MCS+ is a further refined version of this approach. By extending parallel operation to the class-A drive stage of the current/voltage converter, the noise floor has been lowered further.

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Continuous Average Output Power: Stereo operation 150 watts per channel into 1 ohm, 120 watts per channel into 2 ohms, 60 watts per channel into 4 ohms, 30 watts per channel into 8 ohms. Monophonic operation (bridged connection) - 300 watts into 2 ohms, 240 watts into 4 ohms, 120 watts into 8 ohms. 

Total Harmonic Distortion: Stereo operation 0.05% with 2 ohm load, 0.03% with 4 to 16 ohm load. Monophonic operation (bridged connection) - 0.05% with 4 to 16 ohm load

Intermodulation Distortion: 0.01%

Frequency Response: At rated output: 20 – 20,000 Hz +0, -0.2 dB. At 1 watt output: 0.5 – 160,000 Hz +0, -3.0 dB

Gain: 28.0 dB (with GAIN selector at MAX) (Stereo and monophonic operation)

Gain Selection: MAX, -3 dB, -6 dB, -12 dB

Output Load impedance: Stereo operation - 2 to 16 ohms. Monophonic operation: 4 to 16 ohms

Damping Factor: 400

Input Sensitivity (with 8-ohm load, GAIN selector in MAX position): Stereo operation - 0.62 V for rated continuous average output (30 W). 0.11 V for 1 watt output. Monophonic operation - 1.23 V for rated continuous average output (120 W). 0.11 V for 1 watt output

Input Impedance: Balanced - 40 kilohms. Line - 20 kilohms

Signal-to-Noise Ratio (A-weighted, input shorted): 112 dB (GAIN selector at MAX), 120 dB (GAIN selector at -12 dB) At rated continuous average output

Output Level Meters: -40 dB to +3 dB (indication in dB and %) Logarithmic scale. Operation selector: OFF / NORMAL / HOLD (∞). Meter sensitivity selector (-20 dB). *Monophonic operation: same value displayed for left/right.

Power Requirements: AC 120 V/230 V, 50/60 Hz (Voltage as indicated on rear panel)

Power Consumption: 155 watts idle. 270 watts in accordance with IEC 60065

Maximum Dimensions: Width 465 mm, Height 171 mm, Depth 425 mm

Mass: 22.8 kg net, 29.0 kg in shipping carton