Accuphase E-380 Integrated Stereo Amplifier

AAVA volume control. AAVA is a revolutionary type of volume control that completely does away with any variable resistors in the signal path. Using instead a combination of 16 V-I converter amplifiers with different gain. Unlike in conventional volume controls, the music signal is not being attenuated by a rotary resistor, so that optimum S/N ratio and low distortion can be maintained over the entire volume range. The signal degradation and impedance changes of older designs are now a thing of the past. The Accuphase E-380 uses four maximum-gain V-I converter amplifiers, followed by two amplifier circuits in parallel configuration, which doubles the total output current capability and halves the circuit impedance to further reduce noise.

AAVA Features:

Purely analogue principle avoids the inherent noise of digital circuitry

Excellent S/N ratio at any volume level position

No change in sound quality over the entire range

Finely graded volume adjustment steps

No volume differences between left and right channel

High channel separation

Left/right balance adjustment and attenuation also realised with AAVA

Power amplification stage with bipolar transistors. The power amplification stage features bipolar transistors in a double parallel push-pull configuration.

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 33,000 μF filtering capacitors with 10% more capacitance provide rock-stable high-quality power.

20% more rated output power. Two power amplifier units for left and right mounted directly to large heat sinks deliver ample power, rated for 120 watts into 8 ohms or 180 watts into 4 ohms

Features

AAVA volume control

Power amplification stage with bipolar transistors in double parallel push-pull configuration

Rated for 180 watts into 4 ohms and 120 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

Specifications

Continuous Average Output Power (both channels driven, 20-20,000 Hz): 180 watts per channel into 4 ohms, 120 watts per channel into 8 ohms, 100 watts per channel into 8 ohms

Intermodulation Distortion: 0.01%g

Frequency Response: HIGH LEVEL INPUT/POWER INPUT 20 - 20,000 Hz +0, -0.5 dB (for rated continuous average output), 3 - 150,000 Hz +0, -3.0 dB (for 1 watt output)

Damping Factor: 500 (For rated output with 8-ohm load, 50 Hz)

Output Voltage, Output Impedance (at rated continuous average output): PRE OUTPUT: 1.23 V, 50 ohms

Gain: HIGH LEVEL INPUT →　PRE OUTPUT : 18 dB, POWER INPUT →　OUTPUT: 28 dB

Tone Controls Turnover frequency and adjustment range: BASS: 300 Hz ±10 dB (50 Hz), TREBLE: 3 kHz ±10 dB (20 kHz)

Loudness Compensation:

+6 dB (100 Hz)

Attenuator: －20 dB

Power Level Meters: Logarithmic compression, peak reading meters, output dB/% scale

Load Impedance: 4 - 16 ohms

Stereo Headphones: Suitable impedance: 8 ohms or higher

Power Requirements: AC 120 V/220 V/230 V 50/60 Hz (Voltage as indicated on rear panel)

Power Consumption: 46 watts idle 292 watts in accordance with IEC 60065

Maximum Dimensions: Width 465 mm x Height 171 mm x Depth 422 mm

Mass: 22.8 kg net, 29.0 kg in shipping carton