When SMc Audio (Steve McCormack) rebuilds former McCormack amplifiers he is no longer bound by mass market conventions. Therefore, my Class AB, Ultra-G DNA-1 monoblocks do not have an on/off switch. Steve recommends leaving them on for best sound but turning them off (unplugging them) if I am not going to be listening for a period of time such as a long weekend, vacation, out of town work trip, etc. or during thunderstorms. They are mildly warm when powered on but of course get toasty when played. He does not seem overly concerned about degradation of components due to heat associated with leaving them powered on.
I agree with MC on some stuff, like this issue and the use of springs, and maybe not so much on some other stuff but that is not surprising since we have significantly different systems and probably different system goals, musical tastes, etc. Either way, its all good and his input is typically purposeful and well thought-out. There would be less conflict and friction here if people simply stated their point and moved on, and didn't feel the need to argue issues as if there were only one right answer that works best for everyone.
