Philco 39-7C Restore - Printable Version
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco 39-7C Restore (/showthread.php?tid=24989)
+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Philco Radio Discussions (https://philcoradio.com/phorum/forumdisplay.php?fid=5)
+--- Forum: Philco Electronic Restoration (https://philcoradio.com/phorum/forumdisplay.php?fid=8)
+--- Thread: Philco 39-7C Restore (/showthread.php?tid=24989)
Philco 39-7C Restore - klondike98 - 04-15-2024
I started working on the 39-7C I got recently. The link to the schematic is https://philcoradio.com/library/download/service%20info/yearbooks/1939/split/Part17-Philco%201939%20RMS%20Year%20Book.pdf
Overall it looks relatively decent. There is rust on the back of the chassis but most of the chassis is rust free. It has the usual crumbling rubber insulation for this vintage and all the tubes test good except the 6A7. All of the transformers ohm out OK except for the secondary on the antenna transformer. The 5 ohm section between lead 3 & 4 is open. I'm not quite sure what I'm going to do about that.
[Image: https://www.dropbox.com/scl/fi/6i0ljg88dznwyea9xcos4/Philco39-7C_03.jpg?rlkey=u6l4eiazvip2206qmwih6kieq&raw=1]
[Image: https://www.dropbox.com/scl/fi/06u793mwule23rzn1mrlq/Philco39-7C_04.jpg?rlkey=qhid7f9ac1sn6tc9n9fbtstjl&raw=1]
RE: Philco 39-7C Restore - Paul Philco322 - 04-15-2024
Looks as if no one has been hacking around in there, so that is a help, good luck.
Paul
RE: Philco 39-7C Restore - morzh - 04-15-2024
Bob, yeah. The secondary is critical, as it is part of the tuning.
Is it a simple bobbin, easy to rewind, or one of those "cross-wound" wax-dipped jobs?
RE: Philco 39-7C Restore - klondike98 - 04-16-2024
I’m not sure Mike. I think I’m going to have to take apart to see. It looks like some kind of sleeve over the windings.
RE: Philco 39-7C Restore - morzh - 04-16-2024
Might turn out to be not too bad at all. Looks like a ragular one-layer coil. The sleeve..I guess you'll find out when it's off. Could be of some simple mechanical purpose.
RE: Philco 39-7C Restore - klondike98 - 04-16-2024
When I get back to it I’ll let you know, thanks.
RE: Philco 39-7C Restore - klondike98 - 04-17-2024
This is a Pittsburg PA area radio which is consistent with where it was shipped from. The automatic tuning buttons are set for KQV, WJAS, WCAE, KDKA, and WHJB which according to a 1940 Station Log in our Library are 1380, 1290, 1220, 980 and 620 on the dial. All are Pittsburg stations except WHJB which is Greeensburg (WHJB is currently 107.1 FM in Greensburg).