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Philco 37-640 first IF trnsfr help - Printable Version

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Philco 37-640 first IF trnsfr help - georgetownjohn - 01-09-2025

Good morning members, While I was repairing insulation on one of the two the black insulated thin wires that go into the bottom of the first IF can, I noticed that one of the tiny wires going to one of the terminals on the bottom of the IF can was broken. I retouched the two wire ends with my soldering iron with a bit of solder. My concern, is the IF transformer going to work or not. I see the 2 resistance reading listed in the schematic for part #33 which is the first IF. Can I check if its good by measuring the resistance? If so do I have to disconnect the IF can wire to make the readings. I certainly hope all is not lost. Thanks, John


RE: Philco 37-640 first IF trnsfr help - morzh - 01-09-2025

In the first place I would confirm the abscense of continuity before reconnecting. Just to exclude stupid things.
If this was a real open, then I don't think a short made of solder (I leave the reliability discussion) would change the parameters: as long as you do not see burnt copper and the continuity is somewhat similar to that shown (if it is shown), it should be ok.

RE: Philco 37-640 first IF trnsfr help-update - georgetownjohn - 01-09-2025

Thanks once again morzh for your expertise and help. I will do an ohm test and deterine where to check for continuity.  I will remove the IF can in the AM and get started.  If I find tests fail, I'll ask for your help again.   Regards, John