Accuphase E-280 Integrated Amplifier

Integrated Amplifier with Scalability that Exceeds the Imagination

The AAVA volume control builds upon the knowledge of high end equipment to control volume without loss of information. The power amplification section utilises the instrumentation amplifier principle to create an ideal speaker driver. The low impedance design of the output circuitry brings out the full potential of every speaker. Two option boards can be added for improved expandability. The E-280 sound performance will defy the imagination.

E-280 Highlights

AAVA volume control – AAVA is a revolutionary type of volume control that completely does away with any variable resistors in the signal path, instead using a combination of 16 V-I converter circuits with different gain. Unlike conventional volume controls, the music signal is not attenuated by a rotary resistor, so that low distortion and an optimum S/N ratio can be maintained over the entire volume range. The E-280 utilises maximum gain in 4 parallel rows and secondary V-I converter circuits arranged in 2 parallel rows, which doubles the total output current capability and halves the circuit impedance to further reduce noise.

Reinforced power amplification stage – A power amplification stage with two bipolar transistors in a double parallel pull-push configuration for the left and right channels mounted directly to large heat sinks. Rated output of 90watts  into 8 ohms or 120watts into 4 ohms of high power.

25% improved damping factor – Balanced Remote Sensing and MOS-FET switches result in a damping factor of 500, representing a 25% improvement over the predecessor model.

Power supply circuitry designed for optimum stability – The large transformer and massive 30,000 μF filtering capacitors provide rock-stable high quality power.

Features

• AAVA volume control
• Power amplification stage with bipolar transistors in double parallel push-pull configuration
• Rated for 120 watts into 4 ohms and 90 watts into 8 ohms
• High damping factor of 500
• Power amplification stage configured as instrumentation amplifier
• Current feedback amplification topology in power amplification stage
• Logic-control relays for shortest signal paths
• Strong power supply with massive high-efficiency transformer and large filtering capacitors
• Protection circuitry using MOS-FET switches
• Two rear panel expansion slots allow use of option boards