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I have no sure ideas, just some random thoughts on looking for the streaking.
1) Does the streaking change if you adjust fine tuning? (would indicate problem in IF) I'm guessing not.
2) does the streaking change when you exercise the video peaking switch?
3) check voltages in the video stages
4) is the capacitor on the video output screen grid (schematic not clear, but looks like .22 uF) OK?
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