The thermionic tube which has the oxide coated cathode

摘要

The thermionic tube, especially, being the cathode ray tube, the thermionic tube which at least possesses one which has with the cathode itself which has the cathode canning of the electron emission material which includes the alkaline earths oxide which is chosen from the cathode base which consists of the cathode metal and the group which consists of the oxide of calcium, strontium, and barium oxide coated cathode.