Vintage Sansui AU-999 Solid State Integrated Stereophonic Amplifier 1970-1972Notes Specifications Power output: 50 watts per channel into 8 (stereo) Frequency response: 20Hz to 70kHz Total harmonic distortion: 0. 4% Damping factor: 45 Input sensitivity: 3mV (mic), 2mV (MM), 200mV (DIN), 200mV (line) Signal to noise ratio: 80dB (mic), 80dB (MM), 85dB (line) Output: 200mV (line), 30mV (DIN) Speaker load impedance: 4 to 16 Semiconductors: 41 x transistors, 16 x diodes, 2 x triac Dimensions: 18 1 8 x 6 1 8 x 12 1 2 inches Weight: