Generally each is wound as a separate winding, center taps often as bifilar wire for symmetrical performance. Junctions are made under the wrap that goes around the coils as a final assembly step.
different methods Lee but I usually see wires twisted together and solderSo, what do the junctions look like Joe? Is the wire that is brought out soldered to the winding itself at the right place? Crimped? ?????
Great links thanks .
This is what I'm thinking about doing . Making a transformer with 5 secondary windings and 1 primary (orignal has 2 in parallel) . Each (secondary) will be a separate winding with a CT, except for the two 6.3VAC windings. I start with the smallest secondary coil and work out to the largest and then the primary . Using 18GA magnet wire for all windings(for now) which is rated for over 2 amps. The receiver has a 250w rating and has a 2.5amp primary fuse. Do I really need to know how much amperage each winding could draw ? .
If I can do it this , I will need to know if all these windings will fit in the original core .I need to practice winding first and maybe make one of those transformer kits . What do you folks think ? doable ?
What does wire size have to do with it? Strictly amperage dependent? The older PL 700's had HEAVY solid wire coming out, the later stuff smaller stranded stuff, and then finally a single center tapped stranded..I know tannins aren't wound with stranded...
Yes Lee, I2R loss is what it is about for low frequency transformers. Very high power transformers are wound with wide foil windings.
I am sure that PL gradually worked the cost aspect of the transformer hard which is why you saw degradation in the wires coming out of the transformer. Value engineering setting in.
"Value Enginering" eh?? Cute....
I'm not taking this build lightly ,so there will be more questions. I read its real import to kept the primary insulated from the core .At first I thought to wind the primary first just because it was the primary . More reading is needed and supplies . The wire and insulation tape aren't a problem , its the bobbin . I could make one but pre made one would be better .
I need figure out if the new windings will in the old iron before I start winding it .