Ken from angeltone electronics (Link Removed) in oshkosh is a pretty good guy to go to. i think he's an authorized ampeg repair guy. he repaired a solid state ampeg i had, but i also had him retube my friend's 5150. he's a good guy who does good work and he stands behind it. angeltone electronics is in oshkosh so if you're anywhere in that area that's a good place to go. oh yeah, i don't remember his name but i've heard good things about the guy that works at Henri's music in appleton. i've never actually got any work done by him but, like i said, i've heard good things.