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Pull two valves - one from the pair on each side, it doesn’t matter which* - and set the impedance sector to half the cabinet impedance. That’s it.
Ideally you should check the bias, because the HT voltage will rise slightly, but I’ve never found it makes a practical difference.
It will not make a huge difference to the volume though.
(*On some older JMP Marshalls you should pull the inner pair, because they don’t have grid stopper resistors fitted. This doesn’t apply to any JCM800 or later amp though.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein