[Jayce]

That's neat! Basically it was a way to add an EM speaker to an earlier radio that only took a PM speaker. Basically, the field is powered off the AC. Some late 20's consoles worked that way as well. I had a Lyric console that the speaker simply plugged into an AC outlet on the chassis. My Zenith 34P works in the same basic way. Looks like Magnavox was trying to do the same as RCA did with their one speaker model.