Zenith and other Chicago area factories

[andy]

I actually picked up an old RR-4 from the trash earlier this year. It was in pretty bad shape, but did still work. I saved the magnetron which was made by Raytheon (who owned Amana). It's about twice the size of the common Japanese design that's been used since the late 70's. It has the antenna mounted in a glass bulb on top and you can see the filament glow through the perforations in the wave guide. Interestingly, my RR-9 which was made in the same year as this RR-4 uses a typical Toshiba magnetron. I guess this RR-4 was very late production. Does anyone have the first one they sold in the 60's (RR-1?)?