07-29-2024, 08:19 AM
Yes I’d be happy to add some photos. Silly me; I should know by now to start out a post with some photos! The IF transformer in question is a Philco 32-4257. It is the first FM IF transformer in the Philco 49-906 (also in the 49-905). The base measures 3/4” by 3/4”, and is 1-7/8” tall. It has a resonant frequency of 9.1 MHz. It is a slug tuned circuit; the inductors are adjusted, but the capacitance is fixed. The unit in question is Z300 on the attached schematic. The primary and secondary impedance DC impedance are both 1 ohm.