It's a known fact that amps run on smoke. When the smoke gets let out, the amp stops working. What people forget is that when the old amps were built, they were built by smokers, so extra smoke got into the amps during assembly. Also, bars were always filled with smoke in the old days, so new smoke was added each time the amp was in a bar. If the amp belonged to a house band then, of course, the amp would be constantly receiving extra smoke making it superior to one that spent it's time in a closet or attic. New amps are built in smoke free environments and played in smoke-free environments, so it's a no-brainer why old ones sound so much better.