OK, so now that I got some of my REDDI excitement out of my system, let's move back to the ol' Iron Butterfly. I get it back from the shop, and I use it on a gig and it sounds awesome, but every time I hit an low F# on the E string or an F# one octave up, it puts out a very bad staticky fart sound. No other notes are affected, and it happens in all cabs I've used. Definitely the amp. I'm thinking I have a bad tube somewhere but I thought I'd ask before I go poking around fruitlessly or spending money. Thanks everyone!