There were some Remote controls on EBay.
I don't know what Web pages you looked at, but there's not too many. I did find these if you haven't looked at them.
There's a detailed explanation on YouTube.
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Philco Mystery Control: Theory and Operation
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Beitman 3(1940) page 90-91
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Riders Vol 12 page26
Now I know how they work.
You haven't really told us what work has already that you've done.
So More Details would help.
Have you tested the Voltages? Tubes? Cleaned the contacts, replaced the paper Caps. Adjusted the remote's frequency?
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