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LM317 Failure

"I am guessing that one needs a fairly large heatsink to keep the 317 from overheating once you get tubes with outputs over 10watts."

Good grief, the TO-220 version is rated at 1.5A. Even in free air, it should dissipate a watt or two, and it's thermally protected. Are you using it with a bypass cap to be sure instantaneous current variations don't cause its terminal voltage to exceed the maximum allowable? Even at that, it probably needs either a Zener or a TVS to be sure the rating isn't exceeded. Really, this sounds like a voltage breakdown to me.




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