Method and apparatus for quickly heating a vacuum tube cathode

Details Method and apparatus for quickly heating a vacuum tube cathode Method and apparatus for quickly heating a vacuum tube cathode

1985-08-23

1987-06-23

Chatmon, Saxfield

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

313337, 313341, 313347, 315 98, 315116, H05B 3900, H05B 4114

Patent

active

046755730

ABSTRACT:
Disclosed are a method and apparatus for rapidly heating a thermionic vacuum tube cathode, thereby enabling the vacuum tube to be placed in useful operation shortly after the tube is switched on. Rapid heating of the cathode is achieved by passing current through the cathode, thereby directly heating it. Simultaneously, the cathode is also heated by an indirect radiant heater and by electron bombardment by electrons emitted from the heater. When the cathode reaches its operating temperature, the direct heating current and the electron bombardment are stopped and the cathode is maintained at its operating temperature by the indirect heater alone. Cathode warm-up times of less than 1 second may be attained using this invention.

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