edwinhurwitz
Supporting Member
A sudden turn off of power wont hurt it. You dont NEED to turn to standby then off. Its just like you turned it off on the back. The opposite COULD be slightly abusive. Sending a full signal into a cold amp suddenly, but even then,probably not too bad for a one time occurrence.
The only times a one time turn on sequence that could hurt an amp is if there's a particularly nasty inrush power surge (usually not likely) or if you bring the amp in from where it's been sitting in a very cold car (below freezing) into a warm club and just plugged it in and turned it on, especially if you turn on the standby at the same time. That's definitely not recommended. Although we used to do it all the time in the 70s.
But if the amp is warm and the power goes on and off, you'd have to do it hundreds of times to have any noticeable problems and even then, it's just going to be accelerated tube wear.
