Cathodes heated directly by an electric current

Introduced: September 1968

Last revised: January 2006

Full Title

Details of vacuum tubes of the types covered by group > Electron-emitting electrodes; Cathodes > Thermionic cathodes > Cathodes heated directly by an electric current

Classification Context

Section:: ELECTRICITY
Class:: ELECTRIC ELEMENTS
Subclass:: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS