Eli Duttman said:Gavin,
What is the max. allowed dissipation for any given type? Please take the fact that 3 different rating systems can be found on tube data sheets into account. Design center ratings are extremely conservative and you should never have problems at those limits. Design maximum ratings are pretty good for stating, this far and no more. Absolute maximum ratings are exactly that and should not be reached.
If that 5.5 W. figure you provided is design center, go for it and rest easy.
G said:Hi all. I the issue with running tubes at their max dissipation a thermal issue or a insulation issue? Or both?
I plan on running a output tube at it's max dissipation with good ventilation. Am I still going to run into problems? BTW the tube is the ever popular 12B4A.
Well in the spirit of tubelab we threw the EL34 on the amp and let it play for awhile.... My wife was looking at us like we were schoolkids, but hey it was fun!
There was a certain 'odor' coming from the tube...