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New member requests help with a 38-40 ser. 121 project.
#2

Welcome to the hobby. First I would suggest getting some good schematics and documentation on the radio. Chuck can help you with this on the Philco Test bench. Then I would do a careful evaluation on the underside of the radio, looking for anything that looks burned. Then I would resistance measure the various coils underneath. Just check for low resistance through from at least one tab to another. Then the others to one another. Just to make certain all tabs hook to at least one other. Next, I would pull the rectifier out and bring it up on a dim bulb, should not be too bright on a 60 watt. Measure the plate to plate voltage on the rectifier (A/C volt setting and on your highest scale) from the top of the socket. Should have some pretty high A/C voltage. Also measure the filament voltage from the top of the socket as well. The by now you should notice that hopefully, all the other tubes are lighting. This indicates the power transformer is probably OK.
Order up the proper caps from any of a number or sources available. If uncertain what all you have, if you go to justradios.com and give them your make and model, they will supply just what you need.
Upon receipt of the caps, just replace the electrolytics first, and test the radio. Then go slowly thereafter, a couple of wax caps at a time and test. Just the way I do it. Others will have different ideas.
I have no interest in the vendors suggested other than they work for me. Good luck.
Jerry

A friend in need is a pest!  Bill Slee ca 1970.


Messages In This Thread
New member requests help with a 38-40 ser. 121 project. - by rlarimer - 01-21-2012, 03:33 PM
Re: New member requests help with a 38-40 ser. 121 project. - by jerryhawthorne - 01-21-2012, 06:11 PM



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