KT120 transformer failures

Nope...but you should feel free to call them and bet they'll give you the info you want. I merely described to them the "filament headroom" warnings that I kept noticing in the KT120 descriptions and they said there's plenty of transformer headroom built in. I've been using KT120s for a few weeks now and they sound great with no issues, although I have no idea what the "issues" might be (melting? radioactive waste?). I'm using 2 factory "matched" pairs...otherwise nothing special about them.

Wilson...I looked up "tctubes.com" and now I see why you asked, and I hope you find out and let me know. Although I will feel bad that MY tubes weren't as "custom matched"...damn!

Run the CL120 half power with 4 kt120 each mono block and you can have your kt120s.

Prices being equal. Would it be better to have tubes custom matched by TC Tubes or cryogenically treated by Cryoset? I saw both for about $200/quad. Factory platinum matched was about $25 less. I don't think either process would affect how the tubes work with the transformers of an amp.

I wondered the same thing, but went with a standard factory matched quad without "cryo" treatment just to be cheaper...and now I'll never know! Supposedly the fact that you bias each tube individually makes it less important to have them so carefully matched (according to the manual), but I'm no expert. I did read more about the "cryo" treatment later though and it seems interesting. My amp is still sounding fine, and better actually...KT120 tube break in? Maybe get a custom matched set of KT120s and send 'em out for cryo treatment someplace...your local college science lab might do it for free!