02-20-2006, 10:04 AM
The original Philco service bulletins never gave the number of turns for coils and loop antennas. You may have to find a correct one from a "junker set." Also advertise to anyone who may also have this model to count the turns for you on their set. 
The special IF bypass caps may not be the problem, but if the originals are NOT leaky, leaving them in for now won't hurt.
When replacing parts and wiring maybe you disturbed or re-routed parts or wires causing this IF feedback? Lead dress can be critical sometimes.
A missing loop antenna, whicis also the MAIN antenna tuning coil for the set may casue this. The AVC voltage routes through the loop to the grid of the first tube. If missing it could also cause havoc.
The special IF bypass caps may not be the problem, but if the originals are NOT leaky, leaving them in for now won't hurt.
When replacing parts and wiring maybe you disturbed or re-routed parts or wires causing this IF feedback? Lead dress can be critical sometimes.
A missing loop antenna, whicis also the MAIN antenna tuning coil for the set may casue this. The AVC voltage routes through the loop to the grid of the first tube. If missing it could also cause havoc.
Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com
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