power transformer pt113a wire color code

My guess: Black, black yellow is probably the primary. The useful ones have been cherry picked, I'll have to think of something to do with the rest. I have literally rooms full of surplus transformers that aren't quite right for what I need. I have a big un-rock 'n' roll bald spot from tearing my hair out over stuff like this. and no documention you're pretty much screwed. Your best bet is to leave them in the device they came in so you can reverse engineer your new circuit according to where everything went in the old circuit. Vintage transformers are often a pig in a poke. If I am right so far, we can go about finding out voltage ratios of the windings Off the top of my head, that is 6X4 and 6X5. If I am right so far, you do not have a 5V winding for a rectifier, so you will have to use SS diodes or a 6V rectifier with an insulated cathode. The wires with the high reading are the HV wires, the other is the CT. The yellow wires should have continunity beetween all wires, but resistance between to of the wires will be about twice as high as the other two combinations. If you have continunity between any of the windings, you have an internal short and the transformer is bad. Check for the bare wire has no continuity to any of the other wires. A quick check with an ohm meter can help confirm my guesses.Ĭheck for continunity between the black and black/yellow wires, if so, record the value.Ĭheck for continunity between the green wires and if so, record its value.Ĭompare the values, the heater will be much lower then the primary.Ĭheck for continunity between the black wire and the green wires, there should be none, Also check for continunity between the black wires and the yellow wires and the green wires and yellow wires, again there should be none.

That wouild leave the unshielded as the internal electrostatic shield, if so this is a good transformer. Others are better at hunting manufactering codes then I, so I will suggest another route if that does not work out.Ī quick guess is that the black and black/yellow are your primaries, your greens are your heaters and your three yellows are your HV with CT.

Power transformer pt113a wire color code