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I took another look at Phil's write up of his DuMont restoration, and saw a photo of the "scan lines", and that is exactly what I'm seeing. Information overload apparently caused brain-fade. I usually remember stuff like that visually.
I also saw how his set suffered from lower-than-normal voltage from the high voltage section, which contributed to a VERY dim CRT initially. His fix involved replacing a bad 270uuf mica cap marked C245 on the schematic. Looking at my order sheet from "JustRadios", I see I ordered a couple of these...and remembered they were just for this purpose. I'll try replacing it in the AM and see what happens. Can't hurt since I already have the cap here.
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