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#11
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Looks like motor interference, as noted. Do the sets with the problem have 300 ohm (twinlead) input and the set that is OK have coax? Second the idea of unplugging things, but the first things to check would be motors. Do you have forced air heat? Does it go away when the circulating fan stops?
Do you live in an apartment or duplex? It could be your neighbor's heating system fan motor. |
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