About 15 years ago I bought a Marantz 4400 and a 2325 on eBay. The quadraphonic unit was really cool with the tube oscilloscope. They both sounded tired so I had the 2325 re-capped and it sounded much better- but by real HiFi standards it was pretty much lifeless. Loud- yes, and really beautiful to look at but as a faithful reproducer of quality recordings they pretty much suck.
I loved the nostalgia part of owning them as my first "really good" receiver in the mid 70s was a Marantz 2215B. I still have a Pioneer SX780 in my workshop and it too sounds like crap- but it's pretty and brings back good memories.