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Registered Member #1591
Joined: Wed Jul 16 2008, 06:34PM
Location: Livermore Ca
Posts: 14
The cathode is aluminum and the anode is copper. The vacuum flask and the test tube (inner electron gun) are both boro. The gun housing is made from a softer glass I purchased from a kitchenware store. Its defininately not what you would call high quality. However, due to its 1/4" wall thickness its very suitable for low temperature vacuum use. The electrodes sealed into this gun assembly are indeed tungsten. From one electrode, I have spot welded a stainless steel tig line to the copper anode. I learned a lot from this design and am ready to upgrade.
As of now I have pretty much discarded the entire gun assembly exept for the flange. My new gun will be a bit longer with a biased focusing anode, smaller anode aperature, and all stainless construction.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
teslacoolguy wrote ...
How did you coat the phosphor to the inside of the flask?
reign wrote ...
aonomus wrote ...
Wow, never would have thought of using a filter flask.....
How did you transfer the phosphor coating from fluorescent tube to flask?
From what I have read in the past, you can mix the phosphor coating from the fluorescent with water (I think) and leave it sit in the bottom of the flask. When the water evaporates the phosphor is left behind and coats the glass.
I may be incorrect, though. I am just working off of memory here.
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Homebuilt Cathode Ray Tube
