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sometimes to get the linearity right on those you have to play around a little with the vertical coupling caps values , those 6kv caps.
are you certain your tuner tubes , if tubes and video tube are all ok ? you could try changing one at a time to see if it goes away , reminds me of tape drop out.
do you see those lines if you take one of the antenna terminals off making the picture weaker or with it just running without a signal ?
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