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The exact set and modulator can have an effect on audio quality. If the modulator is one of those consumer-grade models some of those modulate the video over %100 (which generates PM/FM noise based on video content) and later FM modulate the same carrier (adding sound to the noise)...
Some sets like Zeniths had a Buzz control that needed to be set correctly or the sound would be poor.
Knowing the exact type of noise in the audio and more specifics would help in diagnosis.
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