Dumont RA-110 from ETF

[DavGoodlin]

Originally Posted by Kamakiri

Replaced the doorknob, same result. Since my flyback tester told me that the flyback was shorted, and since everything else has been replaced, I'm going to stick with that diagnosis.

And now, the search begins.....

Was your flyback tester a ringer that can detect shorted windings more accurately than a DC resistance reading on an ohmmeter would?

[Kamakiri]

Yup, it's an Eico 944 flyback/yoke tester.....

[DavGoodlin]

Just for a bit of easy help, Ill take a resistance reading on the DuMont Savoy chassis I have. And post it here as an edit.
I have a Heathkit Flyback-yoke-HV probe meter that is similar in that it has 6 selectable ringwaves to test with.

[Tim]

Tim:

I have an RA-110 that is not yet restored and I pulled the HV cage and measured the fly. Mine looks toasty like yours and measures nearly the same as yours on the EICO 944 shorts test. I guess either they are both bad or both good. Resistance measurements for the primary winding are: 1 <84 ohms> 2 <286 ohms> 3. Secondary is 7.3 ohms. If the schematic is correct for the 110, then the primary on mine definitely has shorted turns from 1 to 2. It could also be that the resistance measurements are only for the 103 fly. When Dave posts his readings we will have more data.

I also pulled Rider 3 which has one page on the 110 and have attached a photo, including the note regarding the RA-110 flyback difference from the RA-103. The 103 uses the same fly as used in the early 630 type sets and clones. Thordarson FLY-1, Merit HVO-3, Stancor 8127, Triad D-11, etc. As a test you could probably sub one of those in and see what it does.