[AI2V]

Using coaxial cable on the input to most 1930's radios, especially Philco's, isn't a good idea unless you use a ferrite balun transformer at the antenna terminals; even using a balun will have mixed results. If you look at the input schematic you will see that the capacitance of the coax will go directly across the input input tuning stages; all of this added capacitance will kill reception. You will find that you won't be able to adjust the input stages when using coax.

A hand-wound 1:1 balun of a few turns might reduce background noise but at the cost of some sensitivity.