Sansui - AU-D5 Solid state integrated amplifier

Sansui AU-D5 integrated stereo amplifier in classic silver finish, built in Japan by Sansui Electric Co., Ltd. (roughly 1981–1983). Sonically and mechanically the unit is in perfect working order: all inputs, volume control, balance and tone controls operate without fault and without crackling potentiometers. Visually in nice vintage condition with light signs of use consistent with age; only a few indicator lights on the front panel are currently not lighting, which, however, has no impact whatsoever on the high-quality sound reproduction and operation of the amplifier.
Within Sansui's highly regarded D-series, the AU-D5 marks the application of Sansui’s patented Super Feedforward System (DD/DC). This advanced switching technology was derived directly from Sansui's top line to virtually eliminate transient and intermodulation distortion, while the amplifier retains an exceptionally fast rise time. As a result, the amplifier sounds not only dynamic and powerful, but even in complex passages the soundscape remains remarkably clean, open, and natural.
In terms of sound, the amplifier is known for its warm, musical yet tightly controlled Sansui character, with a solid bass foundation and a silky midrange. For vinyl enthusiasts, the AU-D5 is equipped with a high-quality, low-noise phono preamplifier that can switch between MM (Moving Magnet) and MC (Moving Coil) cartridges. The solid silver-aluminum front panel with classic knobs and toggle switches exudes the golden vintage audio aesthetic of the early 1980s.
Specifications
Type: integrated DC stereo amplifier with Super Feedforward System
Model: Sansui AU-D5
Color: Silver
Year Built: circa 1981–1983
Continuous power (RMS, 20 Hz – 20,000 Hz): 2 x 65 Watts at 8 Ohms
Dynamic Power: 2 x 85 Watts at 8 Ohms
Total Harmonic Distortion (THD): less than 0.02% at nominal power
Intermodulation Distortion: less than 0.02%
Damping Factor: 50 at 8 Ohms
Frequency Response: DC to 300,000 Hz (+0 / -3 dB at 1 Watt)
Rise Time: 0.8 µs
Slew Rate: ±150 V/µs
Signal-to-Noise Ratio: 82 dB (Phono MM), 70 dB (Phono MC), 105 dB (Tuner, Tape, Aux)
Phono Preamplifier: switchable for MM (Moving Magnet) and MC (Moving Coil)
Tone Control: Bass (±10 dB at 50 Hz), Treble (±10 dB at 10 kHz)
Filters and Functions: Subsonic filter (16 Hz, 6 dB/oct), Loudness switch, Muting (-20 dB)
Inputs: Phono (MM/MC), Tuner, Aux, Tape 1 (Play), Tape 2 (Play)
Outputs: Tape 1 (Rec), Tape 2 (Rec), speaker outputs for two pairs of loudspeakers (Speakers A, B, A+B)
Front Panel: 6.3 mm headphone jack
Power Supply: 220–240 V AC, 50/60 Hz
Power Consumption: approximately 250 Watts
Dimensions (W x H x D): 43.0 x 13.2 x 34.7 cm
Weight: approximately 8.0 kg
Manufacturer: Sansui Electric Co., Ltd. (Tokyo, Japan)