[old_tv_nut]

Originally Posted by old_coot88

If the adjustment is having no effect at all, there may be a broken wire going to the blue conv.coil. It's hard to spot unless you're looking specifically for it. Those connections can get a lot of fatigue over time from movement of the conv.yoke assembly. Ask Phil Nelson! (: Bill(oc)

Edit: I just stumbled onto your remarkable saga for the first time. In reading it through, it looks like you've already investigated the above.

Well, I measured a waveform with the current probe, but maybe there is still a problem, like a short instead of an open. - More investigation needed - and I do appreciate the comments.