i have a marshall avt 275 and i turned it on and it had that sound you get when your cables are loose, so i checked my cables and they were fine, then there was a bright blue flash from behind the vent and a bit of a bang, so i turned it of. now when i turn it on i can play normally but there is a constant crackle. any ideas what is wrong?
the pic theif strikes again

Member #1 of im not a member of anything, and i dont wanna be. PM me to join
sounds like a tube blew up....but then again, its a valvestate, and theres only 1 tube...
Ibanez RG550 20th RFR
Traynor YCV50
Fender FMT HH Tele
Mesa Boogie 2ch Triple Rectifier
2 1x12 custom Theile cabs
ISP Decimator
Krank Kranshaft
Boss BF-2 Flanger
BBE Sonic Maximizer