Quasi ScientistMagnetic lens is really cool concept! Here is Crook's tube I've bought (was not able to make by myself yet) and magnetic lens was added. Actually it is a simple coil. By varying voltage, hence current in the coil. The spot can be concentrated to about 2mm
Magnetic lens
A project log for Different Vacuum Tubes
Nothing new here, you can skip it, it just for me. I am a nut head that love glass vacuum and high voltage
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