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Definitely go to a tech. I had similar issue - one of the outer tubes started glowing bright purple, amp was making cracking noises, etc. All resulted in a blown transformer (really lucky that there was a person capable of rewiring it, otherwise...). One of the high voltage/current resistors on...

Hi everyone! I've got a black-stripe Mark III head (rev, 60/100 watt, no-GEQ, export version tranny). Great amp it is, but there are some problems: 1) Reverb can suddenly disappear and reverb knob will start acting like a volume/gain knob. Volume and tone can jump suddenly too. I'm almost got...