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It probably won't hurt anything. It's most likely a loose flyback core and you may be able to silence it by using some silicon to hold it in place. Just use caution when working around the flyback or yoke. There are voltages there that will get your attention. If this is an '81 model, it probably uses an E32 chassis. '81 was also the year that NAP bought the Sylvania and Philco names from GTE; so, you could have a "last gasp" GTE set or an "early" NAP set.
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