Introduction

To mark its 50th anniversary, Accuphase redefines Class-A performance with the A-300. This flagship monoblock amplifier delivers ultra-linear, constant-voltage drive and astonishing detail—bringing music to life with absolute silence and rock-steady power.

Design

Built around a massive low-vibration aluminum chassis, the A-300 employs twenty parallel push-pull power MOS-FETs per channel in a pure Class-A output stage. Dual toroidal transformers feed separate power rails for drive and signal sections, while a fully discrete balanced input amplifier sits close to the terminals for minimal noise and optimal fidelity.

Application

Ideal for reference-level two-channel systems, a pair of A-300 monoblocks can be placed directly on each speaker or run into a preamplifier. Their steadfast damping and high current reserves make them perfect partners for demanding floor-standers, electrostats, or multi-way speakers—delivering effortless dynamics at any volume.

Technology Overview

• 20-Parallel Push-Pull MOS-FET Output
  Delivers 125 W into 8 Ω, 250 W into 4 Ω, 500 W into 2 Ω, and 1,000 W into 1 Ω in pure Class-A.
• Instrumentation Amplifier Principle
  Ensures ideal gain distribution and ultra-low noise by operating two balanced input amplifiers in parallel.
• Current-Feedback Topology & Double MCS+
  Tightens transient response and optimizes stability across all loads.
• Balanced Remote Sensing
  Compensates for speaker-cable voltage drops, maintaining constant voltage at the loudspeaker terminals.
• High Damping Factor (1,000+)
  Provides rock-steady control over speaker drivers for fast, articulate bass and tight midrange.

Key Features

• Pure Class-A operation from input to output
• Twenty parallel push-pull MOS-FETs in the output stage
• Fully discrete balanced input amplifier
• Dual toroidal transformers for drive/signal isolation
• Precision stepped gain switching for ultra-low noise
• Balanced remote-sensing circuitry
• Front-panel five-segment bar-graph power meter
• Speaker-output protection circuitry
• Bi-amp or bridged-mode capability by pairing two units

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