The SA-500A features superior frequency response. By the use of all silicon transistors, a flat frequency response with low distortion factor is obtained from bass to treble. The unit is compact and versatile. In addition to the terminals for connection of a record player, tuner and tape recorder, two sets of terminals are provided for connection of auxiliary inputs to permit reproduction of all kinds of program sources. The amplifier is a product of Pioneer's new model series, designed for both luxurious appearance and operational convenience. Specifications Power output: 13 watts per channel into 8Ω (stereo) Frequency response: 20Hz to 50kHz Total harmonic distortion: 0.5% Damping factor: 40 Input sensitivity: 2.4mV (MM), 193mV (line) Signal to noise ratio: 75dB (MM), 90dB (line) Speaker load impedance: 4Ω to 16Ω Dimensions: 330 x 118 x 313mm Weight: 6kg Working condition ( see video ...the sound is incredible )...but keep in mind that it comes from the attic and maybe need a full cleaning/ set-up/ caps checking. Vintage cosmetic condition, see pictures TEST: UNIT POWER ON and light on, test with music from a smartphone player connected to aux Input and small speakers realistic ( not included ), volume, selector, bass and treble functions, balance are working....all seems working but need maybe a technician check to be sure .... See pictures Very good Packaging ( plastic bubble sheet + box and send with the track number ) Internationals buyers welcome. Worldwide shipping.