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I will need to find a schematic, but have the following information. I do have a 46-420 and it does have a speaker with a field coil winding-not PM. Philco made radios using this case until 1949(49-XXXX) at least. I looked at one of my 1949 models and it has a PM speaker. Once I look at a schematic, I will re-post.
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