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KNowing where you are, and how new/old your home electrical is, is essential in order to give a relevant answer. Could be incorrect wiring, could be a lifted neutral, could even be DC on the audio...

How high is the pitch? A fan running at full speed really isn't that high pitched (maybe 5,000 Hz)-- when compared to the extremely high pitch of the high voltage supply (15,000 Hz or higher).
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I started Kindergarten in fall of 1965; before then, I'd wait up 'till my mom got home from work, often quite late (midnight). I recall seeing some B&W comedy several times, andhave since spent 30+...