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That dot pattern is too coarse to be 3.58. If it wiggles in time with the sound, it's related to 4.5 Mhz, possibly beating with the 3.58. If it doesn't wiggle with the sound, it's something else, but I couldn't guess what. 3 wild guesses: something is oscillating that shouldn't; or the fine tuning is way off and the chroma overloads the video detector; or the IF is distorting.
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