[morzh]

There should be nothing there, as the power switch becomes 0V of the rectifier, but after the "line" wire there is the ballast resistor (not sure what it says there, I don't think Philco used ballast tubes, I think they used Candohms that were riveted to the chassis) that takes care of extra voltage for the filaments, so as terry said, the simplest and reliable way is to follow the sch. Proper resistors can be bought and riveted and wired in.