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Wow! I like that one! I have not seen that model before, nice find. Worth all of 20 bucks. The graininess is most likely a bad connection. The RF input is usually really clear on these. Just check your wires and maybe go inside the set if you have to. I wonder if someone damaged the speaker, hook up something to the headphone jack and see what it sounds like then. If the distortion remains, it is the audio circuit.
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
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