At a gig last weekend, my Lightning 15 suddenly started humming, increasingly loudly. I switched it off immediately, and after a few seconds tried switching it back on. The hum had stopped, but the amp sounded darker. Today I tried swapping out preamp tubes, but found no noticeable differences. Not having power tubes or a rectifier tube on hand that's as far as I got. What would be the recommended next steps?
Thanx
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