I HAVE FOR SALE A STEREO RECEIVER OPTONICA SA-3131 VERY RARE UNIT THE RECEIVER IS MY PRIVATE PROPERTY AND UNTIL RECENTLY IT HAS BEEN IN MY CONTINUOUS USE. VISUALLY VERY WELL MAINTAINED WHAT YOU CAN SEE IN THE PHOTOS. IT IS 100% FUNCTIONAL. NO POTENTIOMETER IS CRACKING, ALL SWITCHES WORK, ALL INPUTS AND OUTPUTS WORK, THE CHANNELS PLAY EQUALLY, RADIO OK. GREAT SOUND, VERY ANALOGUE. I REPLACED THE BACKLIGHT WITH BLUE LEDS. THE RECEIVER HAS NEVER BEEN FURNISHED. IT ALSO DOES NOT REQUIRE ANY OWN CONTRIBUTION / JUST CONNECT AND PLAY PLEASE NOTE THE WIDTH OF THE DEVICE - 55 CMSpecificationsTuning range: FM, MW, LWPower output: 40 watts per channel into 8? (stereo)Frequency response: 10Hz to 50kHzTotal harmonic distortion: 0.1%Damping factor: 20Input sensitivity: 2.5mV (MM), 150mV (DIN), 150mV (line)Output: 150mV (line), 30mV (DIN)Speaker load impedance: 8? (minimum)Semiconductors: 6 x IC, 42 x transistors, 40 x diodes, 2 x LEDDimensions: 550 x 142 x 390mmWeight: 16kg.FREE SHIPPING INSIDE EUROPE NO SHIPPING TO ITALY AND RUSSIA !!!