[MrFixr55]

Haven't had the back off it for a few years, yes, 35B5 (I think). 35B5s and 50B5s were short lived. The pinouts somehow violated some UL directive, hence the 35C5 and 50C5. The newer ones I have definitely have 35C5s. I can't remember if I had the 820 apart; the dial cords are good, and it played without recapping. If my memory serves me right, most of the caps in the 920 are ceramic disks. The later Zeniths definitely have ceramic disks for all but the power supply. Fortunately, none have SMD.

Yes, the 7H820 had 2 FM bands. I have to assume that there was a period of time allowed for FM stations in the original band to migrate to the new 88-108 MHz band. This was one of the wars between Sarnoff and Armstrong that drove him to suicide. Per Wikipedia, RCA suggested to move the original FM band to make room for Experimental TV stations and TV Channel 1 (Which no longer exists) and because the existing FM Band was prone to "tropospheric and Sporadic E propagation" (skip zones). The FCC did so, relegating the existing band to "non-governmental fixed and mobile" radio, ignoring the propagation issue. All commercial FM stations had to stop transmitting on the original band by 01/08/1949. This may be the reason why Zenith (who, along with GE advertised their radios as "FM- The Armstrong System") had both bands on this radio which, I believe was marketed in the 1948 model year, meaning that it may have been introduced earlier, or at least designed earlier.

Close to 400,000 radios that covered only the original band were rendered obsolete for FM by this change.