[Chas]

I haven't done this before, but it's time I figured this out. Not a Philco but a Fairfield Morse. As I understand this I replace the field coil (circled on schematic) with a resistor of the same value and high wattage and put a permanent magnet speaker where the speaker goes. There's a cap/resistor in series across the speaker which I assume stays. Am I missing something??

Ummm, yes, the field coil is in the center-tap return of the power transformer. Its resistance in parallel with three other resistors sets up bias voltages for the radio. May, have to add filter caps to the bias as hum could appear because the lack of inductance for filter ripple. The 6L6 must have a near correct bias as it could draw considerable plate current bring down the total B+.

Yes, follow advice for the speaker repair in ARF. I, had to make a jig for a 12" speaker to correctly align the voice coil to the new cone. Made the jig from a PVC pipe, fittings and a base of MDF.

GL

Chas