01-21-2017, 10:05 PM
I am working on the FM portion of a Philco 48-482 radio. I have the AM/SW completed and working fine, but am having some issues with the FM. I was trying to measure the RF Choke Osc. Cathode on the FM Detector - L300 on the nostalgia air schematic. I also have the Philco Service bulletin for this radio, but cannot find the Henry value. My Sam's copy only lists the ohmage at 9 ohms.
The issue is that I can get no resistance reading through this choke at all, which leads me to wonder if it is working. I would like to possibly replace it but until I know the Henry value, I am not sure what to use. I could not find anything at Play Things of the Past, but do see a number of chokes at Antiques Electronics Supply, but need a Henry value or something close, perhaps.
The attached picture shows the choke plus I circled an odd piece of metal sticking out of the choke that does not seem to have an electrical connection to either lead.
Thanks,
Jim
The issue is that I can get no resistance reading through this choke at all, which leads me to wonder if it is working. I would like to possibly replace it but until I know the Henry value, I am not sure what to use. I could not find anything at Play Things of the Past, but do see a number of chokes at Antiques Electronics Supply, but need a Henry value or something close, perhaps.
The attached picture shows the choke plus I circled an odd piece of metal sticking out of the choke that does not seem to have an electrical connection to either lead.
Thanks,
Jim
