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Of the kind used in photocells.

Of the kind used in photocells.

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[–] • 1 pt

Too bad that electron gun from your other post is not operable. If you pump a thin flat piece of CdS, you can make a green, fan-shaped laser out of it. I used to have a book on lasers from the 70s that showed the apparatus setup and output using a CdS flat placed at the emitting end of the electron gun. It did need a vacuum chamber to make it happen, but otherwise it was a pretty simple setup. Wish I still had that book. I have no idea where it went.

[–] • 0 pt

The electron tube isn't damaged, it would just need to be under vacuum to be operational.

[–] • 2 pts

It might be difficult to burn out the organics and other impurities inside that tube since it's been open ended for so long. I don't see any getters in there either, but I guess they're not as necessary for electron guns compared to other vacuum tubes. It would be interesting if you could get it working though.

[–] • 0 pt

By the other material in there, I suspect they were drawing vacuum at time of operation. There were a number of these devices in various states of usefulness, almost all of them except three were smashed. A few had some sort of screen material on the front, damaged of course.