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Its been a while since Ive had a problem like this but it IS similar to how mine would behave under high-contrast and never happened with green IIRC. My 25V-crt was good and balanced but not like new.
So, it may be a CRT fault that is bore out by how fast the blue and red need to cut off. The white parts of the picture occur when all three CRT grids are as positive, and cathodes as negative as they get. It is probably not a demodulator issue, but its after that stage is the R-Y and B-Y possibly "ringing " as opposed to switching. In bit parlance, it needs to be de-bounced.
One book that may offer insight is the Tab Book - Motorola Color Service Manual by Forest H Belt. Ill check and see if this is discussed...
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"When resistors increase in value, they're worthless"
-Dave G
Last edited by DavGoodlin; 09-02-2016 at 09:18 AM.
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