This is allegedly an OT from a 2203. I bought it cheaply enough. I sent it off to Mercury Magnetics to be tested, and if good, baked out, varnished, and re-leaded. It did test good and here it is. BUT...the wiring mystifies me. Or more specifically, it seems to have an extra winding I don't know what to do with. The primary side is simple enough. Red, white, brown. Easy to figure out which one is the center tap. The scondary side...I'm trying to figure out why they put cloth insulated heavy gauge solid core wire only on the green and brown taps coming out of the left side exit. The black and yellow coming out of the right side exit are connected to the green and brown taps. So there are my speaker taps. Black, green, brown, yellow. But the black wire is much smaller gauge, and the yellow wire isn't solid core or cloth insulated. And then there are the two mystery wires: Light gauge green and brown wires that form a circuit that my meter sees as having 2 ohms DC resistance. (My meter is not very usable at very low ohmages. ) I have no idea what that winding is for.