The part about being used on AM and driving the hell out of it, you got that right. The bias is original, when they went to this big transformer, it only has 1 power setting now. All or nothing. LOL, at one point the guy was doing a 1500-1800 carrier and doing about 3000 pep. (The driving the hell out of it part). This ones gonna get about 15V of bias on it, not the 8,5V like the article stated. And man is he long winded. 1 minute keys are not uncommon. Yeah I figure CT to diode string. I plan on using 22 6A10 diodes in a string and go that route. Install a fuse. I had installed a soft start from Harbach about 6 months ago or so and its ran fine. But the abuse is catching up. Made sure I cleaned the blower and oiled it while I was at it. Looks like bias is original, never changed.