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

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im not sure but mine starts to smoke when my friend uses his distortion pedal with it, mine works perfectly with it so i dont get it