There is a tag on the CRT with the number.
When you post that someone may be able to give
a list of subs.
When you change it the yoke is glued on. If it has removable
magnets on the neck keep them ON also, dont swap them.
That way you dont have to reset the convergence & purity.
Only need to do grey scale, focus & G-2 adjustments.
Tube swap is easy, if it dont have a degauss shield can whip
one in in 10 mins.
And yes always post the model & chassis in the opening
of a new thread
73 Zeno