Thordarson T-20A24

[KG6UTS]

Found a pair of these interstage xfmrs. Bunker of Doom catalog # 630 says 1:3 @20K pri/180K sec both ct. Anyone have paperwork or color code on these?

Thanks!

EdZ KG6UTS

[KE6DF]

It shouldn't be too hard to figure out.

The manual says it has a center tapped primary and a split secondary.

So, using an Ohm meter  you can find three wires making  up the primary. The resistance between either end and the CT should add up to the resistance from end to end.

That should leave  you four wires for the two halves of the secondary and you can find out which wires make up each 1/2 of the secondary with the Ohm meter.

Then put a small AC voltage from a filament transformer into the primary and see which way you need to connect the two secondaries so the output voltages add.

[W7TFO]

Primary usually:  Brown-Red-Blue

Split secondary usually:  Green/Black twice

73DG