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OK I saw in the introduction thread that what I described above is the focus coil. I have attached a picture from a later model restored on Phil's Old Radios website. What's in the frame behind the yoke is what I described. I surmise what's on the ground behind the chassis is the ion trap and it's electromagnetic. My 721 does not have that. It just has a metal band and I don't think it's magnetic in any way. I just looked at Bob Anderson's restoration on this site and his also has the electromagnet. Oy veh!!! Can an ion trap be just a passive metal band with symmetrical projections coming off of it?
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