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I think the real problem is that you've got the DVD player connected to the TV through an RF modulator, so your audio (which is already separate) is getting modulated into an RF signal, sent through the tuner, tuned in, then separated back out again. Does the TV have it's own audio output stage, or does it just feed the audio into the amplifier chassis? IIRC, the Magnavox sets always just used the main amplifier for everything - look at the back where the AUX inputs are. Next to it should be the phono and television. Disconnect the television's RCA plug and connect your DVD player's audio. You'll only be able to use mono, because television wasn't stereo back then. But you can connect both right and left channels through a Y coupler. Or, it shouldn't be that hard to modify it to take stereo, I would think.
-Ian
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