Thanks for the link, im reading that as 3450v UNDER LOAD!? So unloaded he could be at near 4KV dc on a 3 KV rated tube.? Is "over volting" tubes this much typical?? Any rules of thumb to consider here i guess is my question,? Also 3KW PEP from a tube with a 1Kw dissipation must be burning the candle at both ends.? Interesting data point!? thanks,