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Problem was found to be a bad preamp tube. Thanks for your help!

Thanks for the help. I've learned a lot. I think it is a bad 5U4GB Rectifier tube. I will update once the replacement comes.

Thank you for the tip. I'm not familiar with switching out tubes or repairing resistors. What is "RED-PLATING?" Which tunes are the power tubes? How might I identify the faulty one? It did occur again during rehearsal, so I can rule out power supply and heat from being in the sun. Funny...

Thanks, I've been trying to replicate the problem at home and I can't. Could this be problem with the power I plugged into? There was not a power conditioner and I was not plugged into a power strip.

Help! I bought the amp I've wanted my forever through fb marketplace. It is a used 2014 Mark V 90W Combo. I love this amp. I've owned it only three weeks. I used it for one gig, practice at home, two rehearsals, and last night at a gig it crapped out on me. It happened at the end of the...