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Just a quick addition. I haven't traced this out yet but there is an RCA jack on the back for a phono audio input and a sliding switch for selection of TV or Phono. I know similar switches on the Dumont and cloned versions of the chassis with the continuous tuner allowing you to select TV or FM does shut down the TV when FM is selected. I've looked over the schematic for the RCA and it doesn't look like the switch wiring is drawn. If there's a switch that's broken in the phono position, could it be a possible explaination, albeit a remote one, for what I'm seeing?
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