05-03-2018, 11:26 AM
I finally started to work on my 39-40 with scary deteriorated rubber wiring coming from the power transformer. I took the transformer apart, and was able to successfully cover the wiring in shrink tubing and put everything back again with no problems. I've replaced just about all the capacitors, any dried out rubber wiring, and now the radio is playing well. Great tone, lots of stations.
I noticed that two capacitors, both .003mfd ones near the type 42 audio output tubes, were originally rated at 1000v. From what I can understand on the schematic, there shouldn't be anywhere near 1000v in the radio. All of the other paper capacitors removed from this radio were 200 or 400v rated. Was this a case of Philco wanting a higher voltage rating than 400v, and the next available was 1000v? I probably did wrong and replaced them with the 630v ones I have, but the radio is playing fine and nothing has caught on fire... yet.
http://www.nostalgiaair.org/Resources/do...013296.pdf
So the question... can I leave the 630v ones in there? Or do I really need to find 1000v rated capacitors?
I noticed that two capacitors, both .003mfd ones near the type 42 audio output tubes, were originally rated at 1000v. From what I can understand on the schematic, there shouldn't be anywhere near 1000v in the radio. All of the other paper capacitors removed from this radio were 200 or 400v rated. Was this a case of Philco wanting a higher voltage rating than 400v, and the next available was 1000v? I probably did wrong and replaced them with the 630v ones I have, but the radio is playing fine and nothing has caught on fire... yet.
http://www.nostalgiaair.org/Resources/do...013296.pdf
So the question... can I leave the 630v ones in there? Or do I really need to find 1000v rated capacitors?
