ACCUPHASE A-80

The Accuphase A-80 represents the direct evolution of the A-75 model and incorporates numerous technological solutions derived from the reference mono power amplifier A-300, with the aim of achieving even higher levels of sound quality and electrical performance. While maintaining the classic pure Class A configuration, it is designed to deliver linear power across any impedance, driving even highly demanding loudspeakers with exceptional authority. The combination of the characteristic musicality of Class A operation and an extremely near-zero noise level allows for a refined, natural, and highly detailed sound reproduction, capable of enhancing every musical nuance with outstanding realism.

The design is based on a particularly generous power supply section, built around a massive high-efficiency toroidal transformer manufactured to Accuphase specifications, together with two large 120,000 μF filter capacitors placed at the center of the unit, representing the highest capacitance ever used in an Accuphase product. This configuration enables the A-80 to further extend its Class A operating range compared to the previous model, delivering 65 watts into 8 ohms and progressively increasing output as impedance decreases, reaching up to 260 watts into 2 ohms, always maintaining control, stability, and linearity.

Noise performance is further improved thanks to a new fully discrete balanced input stage derived from the circuit architecture of the A-300, which reduces output noise even further compared to the already excellent A-75 platform. The gain control operates directly on the input stage, allowing further optimization of the signal-to-noise ratio while preserving the purity of the musical signal.

An exceptionally high damping factor ensures outstanding driving capability and extremely precise loudspeaker control. This is achieved through a final output stage using ten MOS-FET devices in parallel push-pull configuration, significantly reducing output impedance and improving speed, control, and transient accuracy. The construction also employs carefully selected ultra-low impedance components, including large speaker terminals, gold-plated bus bars, rectangular wire coils, and printed circuit boards with gold-plated fiberglass and fluororesin coating, all designed to ensure reliability, stability, and maximum signal transfer efficiency.

The voltage amplification stage uses Accuphase’s proprietary MCS+ technology, developed to reduce noise through parallel summing of amplifier circuits, while the Balanced Remote Sensing system further enhances loudspeaker control by applying negative feedback to both the signal and ground reference. This solution not only increases damping factor but also reduces total harmonic distortion and intermodulation distortion, improving precision, transparency, and tonal coherence.

The protection system is also designed with a strong focus on sonic integrity. Instead of conventional mechanical relays, Accuphase employs MOS-FET switches with extremely low on-resistance, improving reliability, damping factor, and signal purity. Operating conditions are continuously monitored by advanced sensors that track temperature and overcurrent in real time, responding instantly to abnormal conditions without affecting the audio path. In protection mode, the speaker output is completely disconnected, and the front panel VU meters visually indicate the fault condition.

From an aesthetic perspective, the A-80 maintains dimensions similar to the previous A-75 but introduces a more imposing and refined design, featuring repositioned power meters, enlarged handles, and a more authoritative front panel presence. Every construction detail reflects Accuphase’s philosophy of uncompromising quality, combining high performance, long-term reliability, and an exceptionally faithful and emotionally engaging musical reproduction.

Technical specifications:

• Rated output power (20–20,000 Hz): 65 W into 8 Ω; 130 W into 4 Ω; 260 W into 2 Ω; 520
• W into 1 Ω
• Bridge connection: up to 260 W into 8 Ω; 520 W into 4 Ω; 1,040 W into 2 Ω
• Total harmonic distortion (20–20,000 Hz, rated output): 0.01%; 0.03%; 0.05%; 0.07%
• Intermodulation distortion: 0.03%
• Frequency response: 20 – 20,000 Hz
• Damping factor: extremely high (guaranteed 1000; actual value well above 2000)
• Input impedance: 40 kΩ / 20 kΩ
• Input sensitivity: not specified
• Signal-to-noise ratio (A-weighted, input shorted): extremely high, optimized for near-zero noise
• Gain: up to 28 dB, selectable via switch with Normal / Bi-amping modes
• Power meters: analog VU meters with display and peak hold function
• Power requirements: 120/220/230 V AC, 50/60 Hz (as indicated on rear panel)
• Supplied accessories: AC power cord
• Connections and configurations: stereo operation; bi-amping; bridged mode for up to fourfold power increase; balanced and line inputs
• Dimensions: 465 mm (W) × 240 mm (H) × 515 mm (D)
• Weight: 44.6 kg (net)