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I have had some issues with cable and/or VCRs overloading 1950s B&W sets. It seems that the passive AGC circuits in these sets are not as good as later active designs.
An example is an Admiral Bakelite set that I have. I did have it and three 1953 Hoffmans on the receiving end of one of the Radio Shack room to room TV transmitters. The Hoffmans have gain select swiches and work fine. The Admiral overloads with poor sync and buzz in the sound as the symptoms, along with some picture overloading. It has no gain select switch and works fine using the over-the-air signal from a local station.
The adjustable Radio Shack attenuator has helped on another Admiral that I have, but I have not tried it on the bakelite set.
I would thourougly check the AGC circuitry.
(It has been my experience that GE Portacolor sets also do not work well on cable, I think that this is caused by cheap TV design. They do not work all that well on over the air signals.)
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