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41-280, -286, -287, -290 1st IF Xfmr
Joeztech
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#1

10-19-2016, 05:56 PM
In a Philco 41-280, -286, -287 or -290 radio chassis the 1st IF transformer at the plate of the 1st Detector (mixer) the schematic appears to show an adjustable ferrite core in the primary with a fixed capacitor value, while its secondary that drives the 1st IF amplifier grid has an adjustable trimmer capacitor. I am working on cleaning up the Rider's schematic for these units for a friend and just need to know for sure if I am interpreting the schematic correctly.

Some of you have probably worked on one of these and knows the answer.

Thanks in advance.

Joe
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41-280, -286, -287, -290 1st IF Xfmr - by Joeztech - 10-19-2016, 05:56 PM



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  1. The PHILCO Phorum
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  3. Philco Electronic Restoration