20 Year Old Amplifiers compared to 2017


Just a random thought, but I’m curious just how well the state of the art solid-state amplifiers from 20 years ago compare to some of today’s better offerings. For example, what does a pair of Mark Levinson 33Hs or a Krell FPB 600 sound like if compared to the latest offerings from Pass Labs or Ayre Acoustics?
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My buddy loaned me his Muse One Hundred amp a few days ago. It's gotta be old. 15 years? More? Anyhoo, it's chewy textured delish. Love it. Making my speakers jump for joy.
For anyone that is uncertain if their 20 year old Krell or Levinson is still any good please send it to me and I will check it out and if necessary dispose of it in an environmentally safe way......
My CJ MF2300a hit 20 years old and all the caps needed replacing.  Would have been a fortune if I sent back to CJ but found a local ex-employee to do it for a reasonable cost...from what I gather, capacitors from 20 years ago had a tendency to leak or bulge making them prone to failure.   I'd avoid buying these devices and would opt for a newer device (and did recently).
I don't think my 30+ year old refreshed amp would be terribly embarrassed by most of today's offerings.