I have vintage Sansui QRX-5500 and Marantz 2252B that I went through, cleaned all the switches, pots, etc. and restored slightly. They both work and sound great, but I can tell you that the Sausui actually sounds slightly better than the Marantz. Also, I love the older vintage gear with the wood grain panels, just like the Pioneer Elite units with the wood surround.
The Snasui QRX-5500 is the monster surround 4-channel (Probably quad) unit. I really like the look and sound of it. I only use it in the 2-channel mode, but it is nice.
a few years ago I purchased a mint Pioneer receiver (with wood panels) for my daughter along with a mint Pioneer turntable that I placed a new cartridge on for her. She and other younger people are now getting seriously into vinyl. The Pioneer receiver was in mint condition (seriously). Inside it looked brand spanking new. I found out that It was stored by the previous owner's father that passed away.
They are out there is you look, and most are not expensive. E-bay is a good place to look. If it isn't Marantz or McIntosh, the price is typically reasonable. Also, as I said, the ones with wood casings are beautiful.
enjoy