The Sansui QRX-5001 4-Channel Quadraphonic Stereo Receiver is a vintage audio device that offers a high-quality listening experience. With its brand reputation and model designation, this receiver is known for delivering excellent sound performance. Tested and confirmed to be in working condition, this Sansui receiver is a valuable addition to any vintage audio collection, providing a unique quadraphonic stereo experience for music lovers seeking a nostalgic listening experience. I bought this receiver from the original owner who brought it back from the war. I have cleaned, tested it to the best of my knowledge. The unit played clear and loud in FM stereo, I did not test any other ports. No static and very clear. All display lights seem to be working. There are 3 push knobs missing but they still function fine and you can still use them, you just need to find the chrome covers online. Or just keep it how it is, still functional. Very Rare and nice vintage Sansui Quad receiver! I will take great pride in packing to get this beauty safely to its new home!