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I spent several hours working on it today, rechecking everything. I could find nothing wrong.
John, I experimented with cathode resistor values and found that the original 180 ohm worked best.
So, I experimented with capacitors across the damper. I don't have a good selection of high voltage low value caps, but I tried 40pf, with a small increase in width, and 1000pf, with a very large increase (too much, probably 2 inch overscan on each side). With the 1000pf I still had 20kv, so I'm sure a smaller cap will give me the width I need with plently of HV. I'll order some smaller values.
So, it is still a mystery, but at least I have an operational set. Everything works well now, including the color circuits, and I have the RACS 15G in it (still working fine).
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