02-07-2015, 03:43 PM
Hello, another newbie with my first post. I'm restoring a Philco 650 and would like advice on replacing the speaker with a PM speaker. The original cone is trash. I think I can replace the field coil with a 1.2k 10 watt resistor since the field is not the power supply choke. The field coil measures 1175 ohms. I also would swap the audio output transformer for a 14k center tapped primary/8 or 4 ohm secondary for the PM speaker. Are there any other changes I should consider?
Rod
Rod
