Marshall JTM45 Output TFMR. Fender PN: Marshall PN: 784-103. PAM-OT-45-30T. For over 40 years, we have been designing and manufacturing transformers for the most iconic amplifiers ever created. Built with paper, steel, and copper to vintage specs for that true vintage sound, because plastic sounds like plastic. We now bring you the RED Series. Identical to our renowned vintage replica line, assembled in our international manufacturing facilities using the exact materials and specifications as the products built in California. Additionally, the RED Series products feature cherry red powder-coated end bells, combining classic vintage sound with a hot new look.