[Guest]

I recently acquired a Philco model 38-5 tombstone that is missing the speaker. I have placed requests in the "Wanted" sections of various radio sites but have come up empty. As a temporary solution I would like to install a permanent magnet speaker until I someday find an original. While I've restored a quite a few radios in my time I have never had to replace an electrodynamic speaker with a permanent magnet type and am unsure how to proceed.

I'm missing:

- the output transformer
- the field coil

(are the output transformer and the field coil the same thing?)

- the voice coil

I've done some searching and it sounds like using a choke of the appropriate rating is preferred to using a resistor and bumping up the capacity of the filters when replacing the field coil so I'd like to go that route.

In the absence of the original speaker how can I determine what the voice coil resistance is?

I'm not even sure how to begin . Any advice would be appreciated.

Thanks,
Geoff