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There's an old site with a nice run down of building simple DIY CRT's using a glow discharge electron gun and laboratory flasks: http://www.sparkbangbuzz.com/cr
by MisterTea 2y ago
There's an old site with a nice run down of building simple DIY CRT's using a glow discharge electron gun and laboratory flasks: http://www.sparkbangbuzz.com/crt/crt6.htm http://www.sparkbangbuzz.com/crt/crt6.htm The glow discharge stuff is very easy to build as you dont need a filament/heater and power supply, it's a cold cathode gun. I wound up coming across another simple and fun project that demonstrates a very simple glow discharge gun in a glass bottle: https://hackaday.com/2011/08/30/diy-electron-accelerator/ https://hackaday.com/2011/08/30/diy-electron-accelerator/
I built one of those bottle accelerators but with some mods using a smaller Stuart's soda bottle. Cathode is a 0.5 in diameter Al spacer bushing mounted to one end of a 0.25 inch aluminum tube punched through a rubber stopper and the other to a tube adapter screwed to a KF25 vac flange. I then rigged up a stand to hold a vacuum manifold connected to my Alcatel 2008 vac pump and could pull a nice vacuum down to 0.4 Pa. The bottle gun's anode is a loop of 12 AWG copper wire inserted into a drilled hole and sealed with Faraday wax (safe and easy to make but messy and does not easily clean up.) Finally, wired it to my 200W Bertan +10kV 20mA supply. The +10kV lets me setup the gun as a common cathode putting the electron gun parts at ground potential. Only the anode is at high potential. I then decided to see if I could focus the beam and MacGyverd a lens out of a big 2 inch conduit bushing I had lying around in the electrics bin. Wound a bunch of 20 AWG magnet wire around it and found that building a big enough field to focus and sat it around the bottle neck. That big hunk of steel took a crap ton more power than I thought - I could focus the beam to midway of the bottle at around 300W (30V DC @ 10A)into the focus lens (yes it got very hot)! At full beam power I can melt holes in tin foil sheet using a focused beam.