Dave,
I'm glad to hear that the set "lives" again. For the gray scale and convergence, you just need to make sure the CRT is pointing to true north (of course with the 15 degree magnetic correction), set aside 2 to 3 hours, and have a nice comfortable pillow to keep your butt from falling asleep while you are diddling all those hidden front panel controls, and it will be back to making perfect pictures.
Chuck