10-10-2017, 10:01 AM
The Philco service info lists a LOT of production changes for this radio. The 3LF4 was added in Code 125. The note says "voltages are the same" as the 3Q5. It shows 8.5 volts DC on cathode/filament pin 7, and 7.0 volts DC on the filament center tap pin 8, if that helps. 67 volts on the plate pin 3.
John Honeycutt