Restoration Idea 3
Repairing and Restoring an American Bosch Model 360 Radio Speaker
Repair and Rebuilding an Electrodynamic Speaker Complete Restoration Date August 2013
I was given a American Bosch Model 360 tombstone superheterodyne multiband radio made around 1931-1932. Every electronic component had to be replace. When the radio was tested no sound. It turned out that the speaker voice coil was open. Since the speaker was electrodynamic, meaning it has a large electric magnet that doubles as a filter choke attached to it. I could have kept the coil, mount in somewhere and replace with a modern permanent magnet speaker. However this would be a repair not a restore and it would be visible from the rear of the set. I decided to take on the challenge and build a new voice coil.
3. Contact Cement was swabbed on the coil form. This will help tack the wire to the form so it won't loosen suddenly.
4. A coil winding jig was setup to maintain tightness when the coil is being wound.
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