dtmcdonald, rebuilding a CRT is a complicated multi-step process. Replacement guns are no longer available, so old ones must be rebuilt. Replacement cathodes, heaters and spacers may not be available. Pyrex tubes introduce more issues.
Take a look at these links to see what is involved:
http://antiquetvguy.com/Web%20Pages/...ie%20Page.html
http://www.earlytelevision.org/pdf/C...t_williams.pdf
We are attempting to set up a facility to do it, but there are many issues that still remain:
http://www.earlytelevision.org/crt_project.html