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Looks like the horizontal oscilator never really locks onto anything, it's just drifting through it's range. Looks exactly like my CTC-7 when I couldn't get the chroma demods to work correctly, the colors would just float by and never settle into a stable picture like it should. I suggest you begin looking at your sync seperator section and if that's working as advetised, see if the sync signal is actually making it to the horizontal section.
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Evolution...
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