"Cathode Ray Tube 2 Worlds Smallest?" received numerous comments questioning its status as the worlds smallest CRT so I have made "Cathode Ray Tube Worlds Smallest? Second Version". Notice the question mark at the end of the title. I am not making claim to the worlds smallest, I am merely asking the question.
The outside diameter of this CRT is 3 mm (less than 1/8 inch). Actual working screen diameter is 1.8 mm because of the wall thickness. This CRT will fit loosely through a 1/8 inch hole.
Deflection is with magnetism.
These cathode ray tubes are very simple and easy to make so making them very tiny is not a big challenge. I made this one the size it is for the fun and curiosity of seeing if it would work, and I couldn't let all the challenging comments received with the first "Cathode Ray Tube 2 Worlds Smallest?" video go unanswered. The most challenging part of this project has been in getting good video's of it in operation.