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Concerning my sound trouble, I want to try swapping out that 1st IC which, I think?, corresponds to the sound IF amp through detector circuits in a regular tube tv. The Zenith part # is 221-481. 221-48 = nte-1162, while 221-48-01 = nte-712. But I can't find a cross-reference with just 221-481, is the part I need one of the above 2, or something else? Working on such a "late-model" tv is unfamiliar territory for me.
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