[Arran]

i think it's worth observing that Philco sets, unlike RCA or G.E, did not have an electrostatic shield on the power transformer, it's a band of copper foil wrapped around the outside of the core, and grounded to chassis, so Philcos, not having this, needed to have caps on the power line. Philco seemed to really like adding capacitors anyhow, they always seemed to use more paper caps in their circuits then other makes, at least in the 1930s and 40s, especially their early TV sets.
Regards
Arran