I registered as a P/L repair facility around March of 1983. I requested manuals and received everything available at that time including a 37 page "SERVICE DEPARTMENT PARTS LISTING" dated 3/1/83. Ed, I'll scan the list and send it to you. Please message me with an email address.
From 1978 to 1980 I worked at Custom Coil and Transformer as an engineering tech. They went out of business a few years ago. If they made P/L transformers it was likely before my time. They would make one custom transformer if some one wanted it. I got pretty good at reverse engineering burned up transformers. It never occurred to me to check the customer list, otherwise I would have had the designs.
For what it's worth, the coils were wound on a machine similar to a wood lathe. A paper rectangular tube two feet long was fitted into the machine. The rectangular tube inside dimensions were based on the size on the E-I transformer lamination dimensions. The width of the tongue on the "E" was one dimension and the stack size (number of laminations) was the other dimension.
If the height of a coil was 2", about 10 coils would be wound simultaneously on the 24" tube. The winding machine would be fitted with 10 spools of wire. The machine had gears that I would set up so the wires were properly spaced on the coil. Operators would tape the wire down on the tube and with a foot peddle, set the winding machine spinning to wind one layer. A sheet of craft paper would overlap the tube and the next layer was wound.
I think I still have a turns counter and could produce a spec if some one had a sacrificial transformer to dissect.
