

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