About 10 years ago I had a guy in TX rebuild a tube for me, cost $80 then!
It went in this set, still works good AFAIK.
http://www.vintagetvsets.com/rcaswiv.htm
I can't remember his name but we corresponded a little and he told me he had a 21" Hoffman Colorcaster, wish I'd been a little more interested in early color, I might have made a trip to Texas!