I have a SVT3 pro with a musicman and 6x10 cab. The first head i bought just did not even turn on when I took it home. The second one has seen gigs and practices constantly and is notover run. today it popped and went dead again. Nopower. Advice needed. had recieved the second one for free after returning first to guitar center. I dont wanna own this head if its gonna have reliability problems. FRustrated and slumpedover. please help.