Accuphase A-65 (2009)
Stereo power amplifier released in April 2009 with pure Class A operation and fully balanced signal transmission.
Overview
The Accuphase A-65 is a stereo power amplifier from Accuphase Laboratory, Inc. It came out in April 2009 as the successor to the A-60. It runs pure Class A, with a fully balanced signal path from input to output stage. It works in stereo or monaural mode, and bridge connection gives high-power monaural use. The control buttons now sit under a cover on the front panel, which the A-60 did not have.
Specifications
| Rated Output (Stereo, 8 Ω) | 60W + 60W |
| Rated Output (Monaural, Bridge, 8 Ω) | 240W |
| Total Harmonic Distortion (Stereo, 4–16 Ω) | 0.05% |
| Frequency Response (1W Output) | 0.5 Hz – 160 kHz (±3.0 dB) |
| Damping Factor | 400 |
| Input Impedance (Balanced) | 40k Ω |
| Input Impedance (Unbalanced) | 20k Ω |
| Gain | 28.0 dB (switchable: Max, -3dB, -6dB, -12dB) |
| Signal-to-Noise Ratio (A-weighted, Gain Max) | 115 dB |
| Power Supply | 1kVA toroidal transformer, 82,000 μFx2 smoothing capacitors |
| Power Consumption (No Input) | 280W |
| Power Consumption (8 Ω Rated Output) | 380W |
| Dimensions (W×H×D) | 465 × 238 × 515 mm |
| Weight | 43.0 kg |
| Output Devices | Power MOS-FET, 10 parallel push-pull per channel |
Design
The A-65 is pure Class A with full balance transmission throughout the signal path. The input stage is an instrumentation amplifier, and the amplifier circuit is current feedback. The MCS+ circuit cuts noise by expanding parallel operation into the Class A drive stage. A Hall element detects output current for the digital and bar graph meters. The meters have 5-digit and 25-point displays with range and hold settings. The power supply uses a 1kVA toroidal transformer sealed in a non-resonant aluminum housing. The electronics are mounted directly onto large side-mounted heat sinks. Inputs are balanced (XLR) and unbalanced (RCA). The speaker terminals take banana plugs and Y lugs. A toggle switch on the rear selects DUAL MONO (bi-amp) or bridged monaural mode.
Context
The Accuphase A-65 succeeds the A-60 with a redesigned input stage and an updated front-panel layout with hidden controls. Accuphase Laboratory, Inc. developed it. The company was originally founded as Kensonic Laboratory, Inc. in 1972 by former Kenwood engineer Jiro Kasuga.
Market
The A-65 had an original price of ¥1,000,000 in April 2009. A 2024 listing noted an asking price of 15,000 euros. One European review cited a price of 460,000 Czech Koruna at time of review.
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