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It could be a preamp valve problem though. To test that you need one spare 12AX7 - it won't be the 12AT7, which is just the reverb driver.
Does it cut in and out instantly, or fade in and out over several seconds?
If it's quick, check the speaker connections - they use push-connectors which in my experience can be unreliable. Not usually on newer amps, but still occasionally. Also give the speaker plug into the back of the amp a wiggle, sometimes the contacts can get dirty.
If it's not that, or if it's a slow fade-out, it's likely to be a connection problem inside the amp, probably one of the connectors from the power amp to the PCB.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I would say it fades in and out rather than a cut out completely - like I could play for 5 seconds at a reduced volume kind of thing.
I just pulled out the speaker plug and put it back in and randomly touched the speaker connectors because they look fine - I played for about 15 mins and no cutting out! The past 3 times I've played it it's been cutting out! So ... despite being a fade in and out over several seconds thing, maybe it has been cured?
Hah I'll find out tomorrow, a bit late to be playing now!
Thanks for the help!