With a few exceptions, I’d think really good sounding stereo hasn’t Earth shatteringly changed in the last couple of decades. Delivery Systems changed, the way we deal with bits changed, but a really good rig from 1999 still sounds like a really good stereo. A Jadis Defy 7, a dCS Elgar Plus...etc. I’d imagine it all still sounds pretty good. Why wouldn’t it?
I mean, a lot of preamps, for instance, came and went along with a lot of technological marketing bluster but a Krell KRC HR (I don't even remember what year it came out) still sounds like one of the very best preamps I've ever heard.

