Gift: ERLA Model S-11 #16149

[Fran604g]

Well, I guess that's that. I'm not getting any continuity or resistance measurements across either transformer, primary or secondary.

I'd think at least one of the four windings would show something.

[Electronic M]

Originally Posted by Fran604g

Well, I guess that's that. I'm not getting any continuity or resistance measurements across either transformer, primary or secondary.

I'd think at least one of the four windings would show something.

Audio transformers? Try putting A and B voltages to the radio. On 20s sets sometimes the open will weld closed under normal opperating conditions . On a Atwater Kent 40 I fixed for a friend both both windings of the interstage transformer tested open. We were ready to swap in a RC coupling circuit to replace it but we decided to power up the set and test with a signal source first and not only did it work but continuity returned in subsequent tests.

Same thing happened to me recently with a horn speaker that had an open voice coil...tested wide open, but I connected it to my radiola and it worked and tested as having good continuity afterwards.

Even if dead you can still replace with RC circuits with some datasheet searching and maths.

[Fran604g]

Originally Posted by Electronic M

Audio transformers? Try putting A and B voltages to the radio. On 20s sets sometimes the open will weld closed under normal opperating conditions . On a Atwater Kent 40 I fixed for a friend both both windings of the interstage transformer tested open. We were ready to swap in a RC coupling circuit to replace it but we decided to power up the set and test with a signal source first and not only did it work but continuity returned in subsequent tests.

Same thing happened to me recently with a horn speaker that had an open voice coil...tested wide open, but I connected it to my radiola and it worked and tested as having good continuity afterwards.

Even if dead you can still replace with RC circuits with some datasheet searching and maths.

Thank you, I'll try that once I put together a suitable A/B/C PS.