Fully functioning legendary Sansui AU-555A amp from the 70's complemented with the TU-3900 tuner. Description In design, appearance and performance, the amplifier draws heavily on the careful engineering that has made Sansui's larger AU amplifiers, favourites among stereo enthusiasts throughout the world. The AU-555A is an upgraded model of the AU-555, featuring refined dull black panels and the exclusive triple tone controls. Specifications AU-555A: Power output: 25 watts per channel into 8Ω (stereo) Frequency response: 20Hz to 30kHz Total harmonic distortion: 0.5% Damping factor: 50 Input sensitivity: 2mV (MM), 180mV (DIN), 180mV (line) Signal to noise ratio: 70dB (MM), 80dB (line) Channel separation: 45dB (MM), 50dB (line) Output: 180mV (line), 30mV (DIN) Speaker load impedance: 4Ω to 16Ω Semiconductors: 23 x transistors, 2 x diodes Dimensions: 395 x 127 x 278mm Specifications TU-3900: - FM Section - Tuning Range: 88 to 108 MHz - Total Harmonic Distortion: less than 0,3% (Mono); 0,4% (Stereo) - Signal-to-noise Ratio: better than 70 dB