This topic has been covered on many threads, but it needs repeating. A manual re-set ground-fault interrupter will save your Dynaco bacon every time. By the time the power blasted back on, I'd dashed into the living room. Everything was calm; no power to the equipment. The GFI had done its job.
Waited 10 minutes for everything to chill, then reached under the cabinet and powered it all back up. Had the GFI not been on line there would have been emitted a lot of magic smoke.
One has de minimus spent $50 per each on power tubes, plus a bit on rectifiers.
A $30 investment to save your equipment is quite sensible. No matter how reliable you think your power company's lines are, there's always a drunk to run into a power pole or a winter ice storm, or somebody throwing a switch the wrong way at a distribution centre. Doesn't take but a second or two to wreck everything. A MANUAL RESET GFI is a cheap insurance policy.