Accuphase A-80 Class-A Power Amplifier

Name: Accuphase A-80 Class-A Power Amplifier
Brand: Accuphase
Availability: OutOfStock

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A Legendary Amplifier Reimagined

The Accuphase A-80 is a legendary power amplifier that has been revered by audiophiles for decades. This reimagined version of the classic A-80 offers a level of performance that is both familiar and groundbreaking.

At the heart of the A-80 lies a fully balanced Class-A amplifier circuit, ensuring exceptional linearity and low distortion. The amplifier's power supply provides clean, stable energy, even during demanding listening sessions. The result is a sound that is both powerful and refined, capable of driving even the most demanding speakers with ease.

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Specifications

Power output: 60 watts per channel into 8Ω (stereo), 240W into 8Ω (mono)

Frequency response: 20Hz to 20kHz

Total harmonic distortion: 0.03%

Damping factor: 1000

Gain: 28 dB

Input sensitivity: 0.87V

Signal to noise ratio: 128dB

Speaker load impedance: 2Ω to 16Ω

Dimensions: 465 x 238 x 515mm

Weight: 43.9kg

High damping factor realises ideal speaker drive

To correctly track the dynamic changes in loudspeaker impedance and drive the speakers with ideal characteristics, the power amplifier output impedance needs to be kept as low as possible, which in turn means an increase in the damping factor. To achieve this aim, the A-80 not only positions the negative feedback sensing point close to the speaker terminals, it also obtains sensing information from the ground line at the same time. This method is called Balanced Remote Sensing. The aim is to minimize output impedance and therefore achieve a significant increase of the damping factor. Furthermore, ten power MOS-FETs with excellent current capacity are used in a parallel configuration, and MOS-FET switches that eliminate all mechanical contacts guarantee outstanding long-term reliability. The edgewise coil with large cross-section area, Hall element for current detection, and many other sophisticated features further contribute to reduced output impedance. The end result is a damping factor rating of 1,000 which represents a 25% improvement over the previous model.

Output power characteristics suitable for constant voltage drive

A massive toroidal power transformer and large filtering capacitors (100,000 μF x 2) in the power supply ensure that plenty of power is available for handling high amplitude input signals, and large heat sinks efficiently dissipate any excess thermal energy. As a result, the power amplification stage is rated for a continuous 60 watts into 8 ohms, 120 watts into 4 ohms, 240 watts into 2 ohms and 480 watts into 1 ohm (music signals). This linear power progression demonstrates that constant voltage drive has been successfully realized. The maximum output rating is 131 watts into 8 ohms, 232 watts into 4 ohms, 370 watts into 2 ohms and 547 watts into 1 ohm (music signals). Although a Pure Class A Stereo Power Amplifier, the A-75 can easily drive even large and demanding speakers.