I'm wrapping up my first build (5F6a) and am considering the humdinger mod to clean up some of that good ol' 60hz hum. Does anybody have any experience with this? I use this amp for touring and thats about 150 shows a year. When you adjust the pot for the best balance are you adjusting for the nature of the amp itself or for the power you're connected to? In other words, is this something to adjust on a day to day basis or just once? I'm trying to decide how accessible I want the pot to be! Will post pics and clips soon.