25-04-2025, 09:47 PM
(25-04-2025, 04:02 PM)ppppenguin Wrote: The cathode is activated in a vacuum and is spoiled immediately as it's exposed to air.Personally, I have high hopes for using H/C sets from a working CRT. During such work, the activated cathode will of course be exposed to contact with air. There is no clear data on how much time (seconds? minutes? hours?) is needed for irreversible destruction of the cathode and significant loss of its emission. At least I have not found such studies. Certainly, a very dry environment will slow down this process - slower hydration. In the glory days of electron tubes, such phenomena were not thoroughly studied, I think, because they had no practical use. Rebuilding the CRT consisted of installing a new gun taken from the shelf, not transferring it from another. The first experience with the CRT that I have planned will be the elimination of the vacuum and its quick restoration without manipulating the electron gun. Emission control after such a test will be interesting.
