i have a pair of tube amps and contrary to popular opinion, i don't notice a difference between 10 minutes and 100 minutes, as to sound quality. keep in mind, while you are waiting for the amp, preamp and cd player to warm up, there may be changes in consumption of electricity by your neighbors, which will affect the sound of a stereo system.
intelligent use of energy is an indication of maturity.
intelligent use of energy is an indication of maturity.