looking at the sub-chassis mod you were talking about, it looks like someone was attempting to possibly add an FM tuner to the radio which more than likely would of been originally AM only or AM and SW.
But that's just my guess, possibly what happened was that they started doing the mod but then got sidetracked (I know its easy to do when you have several projects on the bench at once) and never finished the FM Tuner Mod.
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