05-09-2020, 09:21 AM
Look at the service info for the PT-4:
https://philcoradio.com/library/download...20Book.pdf
36-1533 is the field coil of the electrodynamic speaker (this is before the days where they could cost effectively make strong permanent magnets). The field coil doubled as part of the original filtering design.
https://philcoradio.com/library/download...20Book.pdf
36-1533 is the field coil of the electrodynamic speaker (this is before the days where they could cost effectively make strong permanent magnets). The field coil doubled as part of the original filtering design.
