I'm trying my first amp build. It's just a mono 25W solid state. Nothing serious. I'm using a transformer I scrounged out of an old Onkyo receiver and don't know what all the wires are for. One side has 2 red, 1 black, 1 white and 1 yellow. The other side has 2 brown, 2 orange, 1 green and 1 blue wire. I think I only need to use half of the wires but I don't know which ones. Any suggestions?