5bc3 why such a weird tube

[rcaman]

i have bought a few old zenith sets about 10 or 12 and a couple of motorola 19" tube hybrids. this one old zenith uses a 5bc3 for the low voltage rectifier why didn,t they use a 5u4 i have tons of those. the first 2 zenith 19" b&w came up with raster after a cap reform. i also ended up with a 22" zenith color tube type metal table set. there is still 2 consoles there that i didnt get 23" tube types. think i will get them if nothing but for the crt,s and chassis. on the 22" table top set the 6lb6 has cracked and gone to air and someone had pulled the high volt regulator tube it was laying inside and the green bellfuse was missing. i believe the regulator is a 6hv5. crt on green and red is like new blue is slow comming up but getting better on my sencore cr70 not going to rejuvinate it just yet. will post pics shortly. oh also got 4 nifty appliances from the early 1950,s 2 stoves and 2 ref. love the old appliance styling. havent got them home yet. heavy as hell. steve