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It could also be a ground loop problem considering the number of pieces connected to the set. Try running the set with only rabbit ears and see if you still have the interference. If not, start re-connecting each piece of equipment until the bar appears - then you've found the troublesome piece. In which case, you can obtain a ground loop isolator
If the problem exists even with only rabbit ears, Definitely check the power switch and rectifier as mentioned by Old1625. You may also have a short or excessive leakage in one of the tuner or IF tubes. If you have an o-scope you'll be able to track down the noise a lot easier.
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Jordan
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