Toshiba SA-504 – 4 Channels (Quadraphonic) Selling a vintage Toshiba SA-504 receiver, a rare model in 4 channels (quadraphonic) – perfect for analog sound enthusiasts and 1970s audio equipment. 4-Channel System (Front + Rear) – offers a spatial audio experience, ideal for quadraphonic setups or classic stereo use. Separate controls for front/rear, balance, and tone (bass/treble). Multiple inputs: Phono (for turntable), AUX, Tape, plus connections for 4 speakers. Classic front panel with aluminum and wooden casing – elegant retro design. Solid construction, powerful transformer, warm and full sound typical of vintage Toshiba amplifiers. The unit is in good working condition with normal signs of use for its age. Ideal for collectors or anyone wanting a unique audio setup.