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the line on the top of the screen is most likely vertical blanking information. Ther's not too easy of a fix unless there is a mod for the chassis.
The bad picture, is it smeared looking or washed out? if so there's probably a bad IF tube or open/shorted coupling cap in the video section. If its dim and fuzzy check the HV rectifier tube. I would pull out the chasssis and re-cap everything. Test and replace the bad tubes as well.
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Jordan
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