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There is a project underway to try to rebuild the tube, but it is a very complicated process. Guns are no longer made for the tube, so the original ones must be rebuilt. Then, they must be attached to a stem, which is also no longer made. Finally, the problem of leakage has to be solved. The bond between the metal face and the glass shell has admitted air on most dud 15GP22s. The only sealant that has been found cannot be used at the high temperatures that are required in the rebuild process. And, there is the question of whether the phosphors will survive the process.
The first tube to be tried will be one that still has its vacuum but has no emission. If it is successful, a tube full of air may be tried.
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