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Did you use an RF modulator with the DVD player?
My apologies if you already know this but you can't hook the composite output of a DVD player directly to the Antenna connector of the TV, same with the Cable if it's Digital or the Box doesn't have an RF output.
Otherwise what Dave says applies, try the fine tuning, try rocking the tuner back and forth, sometimes the contacts inside are dirty after 50 years.
Do you get any kind of noise from the speaker, static, white noise?
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