My 21CT55 (CTC2B) has a 21AXP22 and has never lost it's vacuum. I understand that the set originally came from the Las Vegas area to Omaha and has been moved around locally, and still has really good emission. Although It was replaced with a "new" 21AX in 1957, so the original must have crapped out a few years after the set was built.

So who did it? I thought you haven't done a color tube yet?

It's a side note near the bottom of this page.
http://www.earlytelevision.org/yurkon_15g_project.html

Twas' a cattle call for dud 21AXPs here for that attempt some time ago...

John Yurkon here in Michigan did it. He apparently has a rebuilding setup.

I was moving it at the same time you were editing it! :yes:

My 21ax is a colorama rebuild from '62. The emissions are very strong and it performs great. It's a tough one having survived the 1200 mile trip from mass through multiple potholes and frigid weather. I attribute it's long life to the conditions I have in my room. I run a dehumidifier and keep my room at a constant 72 degrees. The only thing that scares me is that the damn evacuation nipple is one of those copper ones that have been known to leak rarely.