I just ran into problems that certainly apply here. I have a McIntosh MC7200 amp from the early 90's,making it around 30 yrs ago. No problems with it at all. However, I went to change the lighting bulbs for the second time, only to discover that due to the heat of the lamps, the plastic housings around the meters, as well as the light socket holders are all disintegrating! I called Mac's parts and service. I was told there are no replacements for the housings, too bad on the socket holders, the circuit board that the light bases are soldered to are no longer available, and the actual meters themselves are no longer available. I also contacted Audio Classics and was told the same thing.
So it makes me wonder about all this, and the fact that in the future I could have a Mac amp that would look awful, meters that don't work, lighting that no longer works, and what else? Maybe some of these meterless amps you see ( i.e. Parasound, etc) aren't a bad way to go. I love this amp, meets my needs perfectly, but I'm a bit frustrated and this looked like a good place to vent!!