Originally Posted by
GAR
btw I was taught shut-down from a few amp techs was the right way to do it, your way.
Their theory is, you give the filter caps a chance to dissipate instead of hard shutdown which they say risks over-capacity peaking that can cause micro-pilferations of the mylar/electrolytic paste barriers which may or may not shorten it's life.
Tubes aren't affected, Ken Bran and Jim Marshall told me that.. though I feel because they couldn't explain "why" they might be incorrect. Jim told me "doesn't matter one way OR the other, if you want to hit standby before shutdown it won't help or hurt anything. The standby is there to prevent cathode stripping from cold start operation letting 'em warm up you see."
So regardless of possible tube or caps shock from hard shutdown, I also rely upon advice from a few pro players who say: when you shut off, just hit both switches simultaneous. Yeah, I hear a low "klunk!" when the final stored energy hits the speakers, but I figure that's what the 1amp fuse is for. I mean, that slight pop is nothing compared to the way the speaker jumps from a Hush-silenced stillness to a full chord roar. Nothing at all like it.
So that's why I hit both Standby and Power at the same time, but only Power on first for a minute before doing Standby.