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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Hi all,
I noticed something interesting, many of the newer tubes being made are using graphite anodes made from essentially the same material used in heatsink sheets and newer fluorescent tubes are starting to use PG as electron emitters as this degrades less than conventional "hot" thorium doped tungsten heaters with time.
If there are small amounts of nanotubes present in said sheets, could I make an atmospheric pressure tube by using a glow discharge plasma as the electron source? The anode would be that sheet of graphite and the grid would be placed between the GDP sheet and this so the whole setup would work like a conventional valve.
Most of the problems with operating vacuum tubes at high pressure have to do with degradation of the heater so this just might work if 100% N2 is used as the fill or just hydrogen.
This would be a bit like a flame triode but a lot more compact.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Thanks for the linkage PM!
BTW did you have any more luck than I did sourcing zinc sulphide? I had a crazy idea about making a homemade "plasma panel" using the OAUGDP effect, hard disk 80 wire cable and some carefully prepared striped ITO. Just the thing for vintage laptop rebuilds as this cable is good to 8KV p-p as long as the current is kept low and the frequency below 800Hz.
The biggest problem I ran into is the lack of a low frequency HV source, most laptop inverters are in the high kHz to low MHz range and this just won't do. Ignition coils are hard to come by as the scrapyards all remove theirs for resale or just dispose of them.
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Glow discharge plasma tubes
