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That fly with the melted black wax is from a 1958 Philco. The replacement with the plastic cover was presumably a few years newer.
TVs were appliances. Within their expected service life (who knows -- 10 years or less, on average?), wax must have worked fairly well, or manufacturers would have been driven to find a better solution much earlier.
I think it was mentioned in the video that the heat of regular operation probably kept things drier during a TV's "first life." The original designers probably didn't plan for a "second life," during which it would sit unused in a damp basement or garage for decades.
Regards,
Phil Nelson
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