I have 3 vintage Pioneer Stereo Receivers. two SX-105”s and an SX-950. I bought the first SX-1050 new in 1978 and was thrilled to own it. It sounded great at the time. It went down in the 90s. My boyfriend at the time, an EE with a Masters degree thought he knew how to fix it. It needed a new power supply as I recall, but he kept seeing things he thought he could make better and when I got it back it was unlistenable! I bought a second SX-1050 off eBay that was like new for $400. This was around 1995 I think. It still works fine, but I’ve moved on as it doesn’t sound as good as it used to, Don’t ask as to the reasoning behind my acquisition of the 950!
I am now using Luxman tube gear with my Quad ESL63 electrostatic speakers. Those speakers are probably classified as vintage and I think that there is little argument that they are considered treasurable by their lucky owners. As to how I feel about them, I joke that they better be buried with me!