Joh DL6ID sent me the above video. We have been e-mailing each other about the W9YEI Television Receiver built in 1939 or so. We have kind of concluded that the builder used an RCA 913 tube as the CRT. This was an oscilloscope tube and was often described as looking like a metal 6L6 with a tiny screen on top. This is kind of neat -- like using something from the old days to peer into the new world of video.
We wondered about the image persistence of this tube. Fortunately for us, we found several YouTube videos showing recent builds or repairs of oscilloscopes with RCA 913 tubes.
Of course, Mr. Carlson has a video on one of these devices (and -- as expected -- has another in his junk box. Mr. Carlson has at least two of everything.)
Here are a few other videos showing RCA 913 tubes in action.
https://www.youtube.com/watch?v=IfN2mmEIfTE (with Men at Work audio)
https://www.youtube.com/watch?v=TJF22Ra2kIM (Summertime.... And the Livin' is Easy)
Here's a nice video from Tektronix on CRTs:
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