Interesting though that most manufacturers still employ them and list their use in the manual. Also it was mentioned previously about maybe using standby with SS rectifiers. Do most modern tube amps not use SS rectifiers? Thus the standby? I don't really care, one way or the other. There are articles showing the science behind both schools of thought. But I do agree it has become a big issue that shouldnt be. Neither is gonna significantly affect component life any more than the heat of a tube amp will affect components.