I'm working on a friend's dead Zenith 6S152 and replacing it with an 8S154. I need a 49-148 or equivalent 12" electrodynamic speaker. Please help lest I replace same with a magnetic speaker and separate field coil. Speaker needs to work and have plug on end. Thanks!

I'm working on a friend's dead Zenith 6S152 and replacing it with an 8S154. I need a 49-148 or equivalent 12" electrodynamic speaker. Please help lest I replace same with a magnetic speaker and separate field coil. Speaker needs to work and have plug on end. Thanks!

The speaker that came with the 6S152 is a 10" EM speaker, using a 1000 ohm field coil and an output transformer for a SE 6F6.
If you have the original speaker, you could make an adaptor board to fit the 12" opening. The 6S152 speaker has the same electrical specs as the 49-148 speaker needed.