My mid nineties Krell KSA200s is fantastic to my ears. Smooth, dynamic and very powerful. Would love to hear it side by side with a new ss amp in the 10k range. Going on 30 years old but looks new inside. Not sure if there has been any service over the years.
50 year old Sansui AU9500 has qualities with semi efficient speakers I feel is hard to match today. Very bouncy sound. Really fun.