[radiomikee]

Here is the other option no one mentioned, I did this once. Use a hacksaw, cut open the frame holding the field coil in place, slide it off the metal shaft it rides on. Remove all the wire from the coil form, and rewind the form with new wire. Attach larger stranded insulated wire to the magnet wire, tape it securely and presto, new field coil. Wind enough #36 wire to get at least 200-2500 ohms in the field coil itself, and series mount another 500-750 ohms under the chassis to make up any shortfall. Put the field coil back in place, rewire it into the speaker unit as previously. Have a metal shop weld the back end of the frame back in place. It's alot of work, but you will have saved another bad speaker which keeps another set running!