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I have a mid-70s Sylvania that also suffers from some vertical jitter. I'll remember this thread the next time I dig into it. One thing I found, and it might be worth checking if you haven't already: the service switch is sorta cheap and not well mounted to the board. It is real easy, when installing the back, to not have the button lined up with the hole. On mine a couple of the posts had been pulled loose from the board due to this, and the intermittent contact was causing both a video and vertical problem. As I write this, I recall that it was mostly video (raster would go dark/negative) but worth checking if you are in there already.
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Bryan
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