[Ron Ramirez]

Hi

Odd that your Rider's does not give specs for the field coil? Usually Rider merely copied the service bulletins provided to him by Philco, and the bulletin for Model 38-12 shows a field coil of 1500 ohms.

Specs for the power transformer, per 1941 Philco parts catalog:
High voltage secondary: 516 volts center-tapped, 50 mA DC
Filament winding: 6.3 volts @ 2A

Specs for the audio output transformer, per 1946 Philco Quick Selector Parts Directory:
Primary impedance 8000 ohms; secondary impedance 3.5 ohms; 3 watts; turns ratio 44:1.

You should seriously consider buying a copy of the factory service info from Chuck; he not only supplies a copy of the original Philco service bulletin, but also an extra-large copy of the schematic, and includes any pertinent changes.
http://www.philcorepairbench.com/schematics.htm

MUCH better info than found in Riders, and at a reasonable price.