Well that's disappointing to hear, sorry about that. Psvane are supposed to be a higher end tube than JJ, but this is the second instance I'm hearing of a Psvane going bad prematurely. My tube supplier finally filled by old backorder for JJ/Tesla 12AX7 so I have a bunch in stock and am using JJ/Tesla for August, I'll be keeping that in mind when I evaluate which brand to use going forward.
You may want to PM Aged Horse about tubes. He's done a lot of research on longevity and reliability and such. Working for Mesa, and Genz Benz before that, his experience is with large scale of production, so the tubes he chooses must be consistent and reliable. Even if what he uses doesn't translate to what's available for you, data points are fun.
