The Sansui AU-3900 is an integrated amplifier manufactured between 1976 and 1977 in Japan. This model caters to audiophiles seeking robust audio performance with a classic design. The amplifier features a black finish and dimensions of 400 x 120 x 240 mm while weighing 5.5 kg. It offers various input options, including two phono inputs (2.5 mV, 50 kOhm), tuner, aux, and a tape input, all with standardized voltage levels. The AU-3900 provides two pairs of speaker outputs along with a headphone output via a 6.3 mm jack. In terms of performance, it delivers continuous power of 22 W per channel at 8 Ohms and 26 W at 4 Ohms, with total harmonic distortion measured at a low 0.15%. It boasts a frequency response range of 10 to 40,000 Hz, and an impressive signal-to-noise ratio of over 75 dB for phono inputs and over 90 dB for high-level inputs. The amplifier includes tone control features for bass and treble, as well as loudness control, high and low filters, and an adjustable microphone input. The model also has a mono switch for added versatility in audio playback.
