KT 150 failure

Jerry, off topic, but always like to ask folks what differences they heard between those tubes.  Accepting different amps, rooms etc.  I still like to hear people’s opinions.  I always suspect that differences are there but not earthshaking.  In the same equipment.  If these 150’s don’t work out down the line,,,,I have other observations to mull over.  Thanks 

That KT 150 went microphonic. I have been running KT 150s for three years and they still are cranking away and sounding good to my ears. I think a lot of power tube life depends on the circuit design and how hard they are driven

George, thanks for the post. As a tube enthusiast I learn from my fellow Agoners. Over the last couple years I’ve had 2 power tube failures with my Had Inspire. The first was a SED Winged C 6550 that had a catastrophic envelope failure. Big pop and a fair amount of white smoke. I happened to be standing at my stereo and flipped the power off. I didn’t notice any sound from my speaker and no amp damage. The second was a brand new pair of new production Gold Lion KT-77’s, one let go damaging the amp and creating a hellacious pop through my Zu Omen. I sent the tubes to Mr Had with my amp for repair. He said it was a “ Runaway plate voltage issue with the tube failing”. I’ve recently purchased a pair of KT-150’s from Upscale and I’m hoping that their sales pitch and expensive price netted me a pair that’s “ More Reliable “ than the average KT’s that people mention. Time will tell, and thanks to you and the others for sharing info as I learn from you guys. Happy Listening , Mike B.