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Hi David,
the foldover seems to be a general problem of these sets.
Tonight I have removed the lline output transformer and tested various other transformers. The best result I got with a flyback transformer from a hybrid color tv set. The width was much wider than the screen width. And I had some arcing in the output tube. So, I replaced the KT63 with an EL36. I added 800 Ohms in the B+ voltage, and I set picture width at minimum. The feedback cap C85 with 230 pF was replaced by 120 pF. With that I got a reasonable result.
This is not the final solution. But this shows the way to go.
Note, that no centering adjustments were done.
Regards,
Eckhard
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