Quote:
Originally Posted by analog
When you say hot do you mean the plate is glowing red? If so the coupling caps NEED to be replaced. Do not operate it like this for any length of time as the tubes are quickly going to be ruined,. EL84s do run hot normally, and probably much hotter than the RF tubes in the set but should never run with red plates.
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When I say hot, I don't mean the plates are glowing. I just mean the tube is physically very hot. Most of the tubes I can actually touch and hold for a few seconds without burning myself. But one of the EL84's is more like a 60w lightbulb after its been on for a while - you can't touch it without burning your fingers. Everything seems to be running well so I assume its ok. I'm sure there are some resistors that are out of spec but replacing them would be such a chore.