I'm restoring an old 1950's I think floor standing Philco radio.  It's got a field-coil speaker and the voice coil is rubbing.  The field-coil seems good, so I thought I'd keep that, but replace the 12" speaker.  The VC resistance measures about 5 ohms.  For those of you unfamiliar with a field-coil speaker, the power supply choke is used for the speaker magnet - there is no permanent speaker magnet.Any thoughts?  Would an 8 ohm Eminance 12" work.  I though I'd try my Theater Pi 4's tonight to see if they work.
Thanks,
Tom