Color crt testing?

[ctc17]

I have seen several round tubes with one open filament so I would not cook it, I have also seen several of them gone or go to air with normal handling and not to mention the bent shadow masks. I have a set with a super strong crt and horrible cataract and have decided to leave it. The odds of damaging the crt are too great. I am reluctant to even remove the base or move my round sets.
If we were talking a rectangular tubes i would say who cares... but the round ones....handle with care!