Vacuum setup
I planned to use a charging hoses with integrated valves to control provide and control the vacuum in all parts of system. But I found that the valves [...]
Vacuum pump running
I finally cleared the pump from mercury (at least what I found), placed new o-ring (what I destroyed myself) and refilled the original Ultragrade 19 oil. The pump [...]
Spot (tack) welder
We can't use a soldering inside the vacuum tube, the tin would melt during the heating of the tube because of the tin low melting point. Instead of [...]
Borosilicate glass
As I mentioned before, I am going to use a borosilicate glass in combination with tungsten wire. This glass is used in labs for scientific glass blowing, so [...]
Vacuum pump
I bought a used Edwards E2M5 vacuum pump for $150. I had thought the vacuum pump would be the most expensive part of the system, what a luck [...]
Tungsten wire
I started searching for material by looking for tungsten wire.. I found several expensive offers on eBay, too much money for several inches of wire :-( Then I [...]
Vacuum gauge
For the rough measuring we can use a common manometer, for more exact measurement at lower pressures, it is necessary to use a gauge for high vacuum. As [...]
Glass to metal seal
The essential matter when making vacuum tubes is good contact of electrodes and glass case, it is called glass to metal seal. It looks simple - just to [...]
