Quote:
Originally Posted by jr_tech
A slightly earlier model used a 16” metal cone round tube...
http://www.tvhistory.tv/1950-Admiral-26X56A-16in.jpg
My guess is that the set in question has a first generation rectangular CRT, like a 20CP4 instead of a later, more common 21inch tube. Might be difficult to find a replacement. 
jr |
Or, it may just be a 17 inch CRT which is from about that era.