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A very engaging and informative thread. Im grateful you started it.
I have a Crosley RFL60 with a Musicone speaker, which also lacks a permanent magnet, using plate current to generate a magnetic field. It looks great, goes with the set, but is a poor performer. I use it for show, but for serious listening I use a Western Electric WE540, which sports a big fat horseshoe PM. The tubes I use are #30, a substitute for the ubiquitous 01A of the time but with MUCH less filament power (60ma @ 2V). So two D cells can power the fils in my 5 tube Crosley for almost 30 hours.
I attach some pics for those interested..
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