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The pre-1950 RCA sets had a very very strange RF setup.
You should try using a standard 75 to 300 ohm balun, the cheap
ones from Radio Shack, and connect one side of the 300 ohm line output to
chassis ground and the other side to one of the RF terminals ...
try both, they are not equivalent. Note that this may require fairly long leads ...
this is immaterial on channels 3 or 4.
My such set (a 9T-246) has a plug-in
thing for the antenna lead which is supposed to support 75 Ohms
directly with a different plug, and that simply does not work.
Doug McDonald
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