Philco 40-120C Filament Wiring - Printable Version

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Philco 40-120C Filament Wiring - bluecap - 02-13-2025

Hi folks, I'm in the process of restoring a Philco 40-120C and I'm finding the wiring to be a bit puzzling. According to the schematic, the filament resistor should be connected to Pin 1 (the heater of the rectifier tube 35Y4). However, it is attached to Pin 5 (a "no connection" pin in the tube) without a jumper from Pin 5 to anywhere else. Meanwhile, Pin 1 is attached to Pin 6 of the 7C6 tube (the tube's triode cathode). It all appears to be the original wiring. Any guidance would be greatly appreciated. Thanks.

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