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Message: <blockquote data-quote="Corium_AZ" data-source="post: 150845" data-attributes="member: 3357">Thanks Rob!I know that typically would be a safe mis-match, but for some reason, it is not the case with a THD hotplate. No idea why, but this same thing has happened before with this same amp, as well as two others (a Bogner Shiva and an Orange Rockerverb). In all previous cases where I failed to properly match the impedances, I caught it before any damaged occurred (the change in tone was significant, and could see the back side of the amp lighting up like a sunrise, lol). Same thing happened in those cases, with one or a pair of tubes on a runaway heat-up...The tube that was in that socket, works just fine in the working sockets. So, while the tube may have had it's life shortened by such a violent heat-up, it still operates and sounds just fine. Good thing, those SED's are pretty damn expensive these days...BTW, tube socket 3 is the culprit.So, that said, I got it apart last night. I could not find any blown resistors, no PCB damage, nothing. All internal fuses in-tact. No evidence of any burning or arcing. So, busted out the multimeter and started testing resistors and caps in the vicinity of that tube socket. Everything checks out just fine compared to the working sockets, except for the following:R24 = 140k (vs 220k on other sockets)C7 = dead, 1.1nF (vs 30nF on sockets 1 & 4)C6 = 14nF, plus the rubber insulator is cracked/split on the topI've no clue what purpose these specific components serve in this amp, so maybe this will help diagnose the issue.Rob, any idea?</blockquote>

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