Hey Big Tom. Sorry to hear about your trouble. Most of my high-end adventures involved tube amps (ARC Classic 60, VT-100, Vt-100 III, Almarro 205A & 318A). I've switched tube tube front-end and SS main amp as I feel tubes homogenize the sound and make everything too smooth (even when it shouldn't be). These KT150s have me interested in tube amps once again and I may try in the future.
I've never had problems with tube performance. When I traded the VT-100 for the MkIII, the dealer told me that one of the tubes wasn't working due to a blown transistor. I didn't notice anything wrong with the sound.
My hell-pit is mounting phono cartridges -almost went crazy when the phono lead broke off and no one in this country wanted to fix it (including the manufacturer). So don't feel picked on (by fate) we all have crosses to bear.
Good luck...