Hi guys,
I recently bought a marshall dsl50 head and it's pretty good however at a gig the other day after turning the volume up to pretty much half way the sound cut, producing some fizz and that was it, when i turn it down and wait a sec it's all good again but over about 3 on the volume scale It's cutting out again, I'm guessing it's a valve problem and seeing as I've treated it pretty well and always allowed time for cooldown I don't think it's anything I've done with handling. Any explanation of the problem or recommendation of what to do is much appreciated

Gear -

Gibson 1967 flying V (cherry)!

Marshall JCM2000 half stack

Boss SD-1

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