20 Year Old Amplifiers compared to 2017

Some may disagree, however I believe MID-FI gear really took a hit in the late 70's until the 90's. Much of it build wise. Pioneer had those gross tan, plastic faceplates. Technics had cheap looking "graphs" printed on the faceplate, AKAI tape deck LED meter strips only had 5 lights per channel, just junk everywhere

Class D and digital amps are relatively new, thus do not have vintage counterparts.

I do say that the early Pioneer Elite Class D amps that were used in their upper end A/V receivers were not bad. I used one from 2003 for 2 channel music for a few years and was surprised how dood it sounded to stand alone class A amps that I tried.