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The vert sync circuit is very good, but the vert freq most likely goes way off without a signal.... That is my guess... I have seen this before too.... And I think its also a blank signal from the rf modulator ( no sync) as mentioned above.... Loop a wire from that scope to the picture tube face and see what the vert osc does when you lose a signal.....
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Yes you can call me "Squirrel boy"
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