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Vacuum tubes: Difference between revisions
→Loss of vacuum
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Gassy tubes will draw more than the nominal heater power because convection transports heat away from the filament. | Gassy tubes will draw more than the nominal heater power because convection transports heat away from the filament. | ||
Slightly gassy tubes exhibit a blue glow from inside (ionization of gas molecules by the electron beam). | Slightly gassy tubes may exhibit a blue glow from inside (ionization of gas molecules by the electron beam) when operated with plate/grid supplies present. | ||
<gallery> | <gallery> | ||
Pristine tubes.jpg | Tubes with pristine getter | Pristine tubes.jpg | Tubes with pristine getter | ||