Breaking into the metal canister that houses the field and hum-bucking coils followed by some brief troubleshooting. Thanks for watching and subscribing to my channel on vintage radio repair.
Better late than never! I've got a similar tear down of an American Bosch radio speaker coming up after I finish the radio. I've repaired a Philco 14 field coil and I was fortunate to find the break.
I have rewound many transformers and field coils over the years. I often find several breaks due to corrosion and impurities in the copper. some coils are shot through with sites of potential failure some of which are manifested as loss of metal and are so weak that they break as they are unwound. Damp storage conditions make these more likely to fail as well as freezing temperatures which cause the wire to shrink in length and fail at the weak points. I knew someone who killed woodworm by putting his radios in a freezer. Almost all his radios had open circuit speaker transformers.
I hope those tapes and papers aren’t made of asbestos. The asbestos thing is beginning to sour me on fooling with old equipment. Anybody know of a simple test for asbestos?
Transformers were typically constructed with glassine or heavy fiber paper coated with varnish. Margin tape (transformer tape) was used and fish paper to separate the primary and secondary winding. Try a search on the ARF for asbestos at: antiqueradios.com/forums/search.php Best, Don
Those wires are so fragile! Always tedious tearing into a coil with that small gauge wires. I dont think you broke any of the wires in the spider's nest. You might have the lead when it popped. The coil was bad to start with and there was some hole of a simple repair, but I have seen coils and I dont know why, the wires come up with multiple breaks. Not sure if its heat or just thin places in the wire. I suspect a rewind coming, which is something I want to become more proficient in. I wish you luck on this one, but! I know you will fix it. Best--Larry
+Backtothefutureradios You were right Larry. I'm blessed to have enough vision to still make a repair or rewind a coil. You gotta build you a Winder and start ripping some stuff apart. Best, Don
It will definitely be a rather tedious, arduous task to count those windings of that extremely fine copper wire, especially with all of those breaks in them!
