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Aha, the true ham spirit!
To avoid all the work, light bulb filaments could be stolen and used in =
the tubes. All one has to do is make the grid, plate and bulb. Then =
evacuate.
If you are planning on any space exploration, you may be able to just =
stick the thing out the window.
Feel free to try some new experiments. Instead of a vacuum, try =
hydrogen. Liquid hydrogen would be another interesting experiment. Or, =
try argon. This would allow you to tune the amplifier just by looking =
at the glow of the tube. =20
Rich might have some parasitic free gas.
In order to justify production, you could make the plates out of gold =
and sell them to audiophools at $10,000 apiece. =20
=20
If you make the tube, you can give it a designator - which could be your =
call sign. The ultimate in homebrew.
73, Colin K7FM=20
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