1957 Admiral Imperial 400 needs a 21ATP4

[Electro44]

Hello all, I'm new on this forum but have been reading it for quite a while. I found this Admiral on the side of the road back in 1987. I have kept it all these years because of it's amazing style...lots of brass trim duel speakers cool grille cloth. The cabinet has issues (mostly spot on top) but I think it is really worth saving. I have collected mostly 7" and 10" sets over the years. Except for the space large sets take up...I really like the outrages looking consoles. now back to the point. I do realize that a 21ATP4 may not be that easy to find...in fact a friend of mine has posted on here looking for this tube a few years ago. No luck. I figured I would give it another try. I always thought I would find a parts set to sacrifice in order to get my tv going. Any Ideas?