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Old 03-06-2018, 09:53 AM
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DavGoodlin DavGoodlin is offline
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Join Date: Aug 2011
Location: near Strasburg PA
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That was a good capture. Was the video source a paused VHS tape? The 9-57 horizontal osc module was susceptible to flag-waving at the top of the raster with many VCR's.

The cure from PTS and Zenith-OEM among others was a 9-57 VCR, which was an empty 9-57 pcb used as a plug for the CC-II H-osc, 9-90 module on top.

This looks like a video or sync lock issue instead of sweep. Look at the video detector sync pulse with a scope and you could see that twitch.
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