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Sounds like you have poor RF sensitivity. Looks for shorts around the antenna leads and antenna input on the tuner. If this has a safety cap(s) between the antenna connection on the cabinet and the ant-in on the tuner it could be bad. It will most likely be a small ceramic.
If you have the sams alignment procedure, check the output of the tuner and IF tubes to see if all stages are working properly. Since you have a sharp picture your video detector and amp stages are probably fine.
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Jordan
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