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The oscillator transistor in the front end of the tuner is most likely dead (open). I've seen at least 3 of these with this failure in the last 4 years here at my workplace. Its a germanium device and I believe there is an NTE/ECG equivalent if you're willing to look around awhile.
However, the tricky part is getting the sealed tuner apart and getting it into a position to where you can check the RF amplifiers while the set is running. See if you can get your hands on a schematic. It will help alot in your troubleshooting.
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Jordan
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