how much does bias float

[gadgetfreak]

Hey guys I just put in some new JJ powertubes in my tweed vibrolux clone(5f11), should the bias be fluctationg when I am playing loudly and really digging in?

I have the bias set for 21mA for each tube but when I am playing I can watch the number on meter go way way up. I also notice when I engage the tremelo it goes up and down but I belive it's a bias something tremelo circuit. I don't know the proper lingo, sorry. So should the bias vary? When idle it come's back down to around 21 to what I set it at. Thanks all

[bdgregory]

by definition, the bias you set is the Idle current (ie no signal). When you are playing - you have your foot on the gas, and lots of power going to the wheels, or rather, Speaker. Current must therefore increase.

[gadgetfreak]

Makes perfect sense and kind of figured that but I've never looked before so it had to be asked. Thanks bdgregory