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Try removing the last video IF tube (or grounding its grid), and feeding a video signal from your crosshatch generator into the grid of the 1st video amp. IF no ghost, the problem is FI or tuner. Try using a tuner subber and feeding the set from the IF output of the subber, bypassing the tuner. This will isolate the ghost to the tuner, IF, or baseband sections of the TV.
Good luck.
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John Folsom
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