Accuphase A-60

Class-A stereo power amplifier with dual-mono design and 60 watts per channel into 8 ohms

Overview

The Accuphase A-60 is a solid-state stereo power amplifier from Accuphase Laboratory, Inc. It was introduced in 2005 as the company's newest model. It puts out 60 watts per channel into 8 ohms, and the output reportedly doubles into 4 ohms and doubles again into 2 ohms. It runs pure Class-A, uses dual-mono construction, and has a massive power supply built around a 1 kVA "Super Ring" toroidal transformer and 82,000μF of filter capacitance. The front panel has controls for gain, meter selection, input, power, and hold time. The dual-function power meters show either a digital readout or a bar graph.

Specifications

Power Output	60 watts per channel into 8 ohms (doubles into 4 ohms, doubles again into 2 ohms)
Operating Class	Class-A (Pure Class A)
Frequency Response	20Hz - 20kHz
Total Harmonic Distortion	0.05%
Signal-to-Noise Ratio	120dB
Input Sensitivity	1.0V
Dimensions	465mm (W) x 190mm (H) x 428mm (D)
Weight	36kg
Warranty	Five years parts and labor

Design

The input circuitry uses MCS topology with a current feedback design. The output stage is power MOS-FET, in a 10-parallel push-pull configuration totaling 24 power transistors. The amplifier is dual-mono, with a heavy-duty extruded aluminum heatsink and a protection assembly. The front panel has push-buttons for INPUT, POWER, and HOLD TIME, plus GAIN and METER knobs. The input jacks are XLR.

Context

In 2005, the A-60 entered a competitive solid-state amplifier market. Models like the Antique Sound Lab Hurricane DT monoblocks, Goldmund Mimesis 9, and Rowland Model 5 were its neighbors. Accuphase was founded in 1972 by former Kenwood engineer Jiro Kasuga. The company designed the A-60 under its philosophy to "enrich life through technology." The brand name comes from "accurate" and "phase."