Cathode heating apparatus for an electronic power tube

Details Cathode heating apparatus for an electronic power tube Cathode heating apparatus for an electronic power tube

1979-06-07

1981-03-10

Smith, Alfred E.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Pulsating or a.c. supply to the cathode or heater circuit

328270, 315105, H05B 3904, H05B 4106

Patent

active

042556902

ABSTRACT:
An apparatus for heating the cathode of an electronic power tube, having a supply for delivering a heating current to the cathode, an interrupter circuit for periodically interrupting the flow of heating current to the cathode, and controls for controlling the duration of these periodic interruptions and for regulating the net amount of heating current. To achieve this, the controls include a voltage control that varies in such a way so as to bring the heating current from a value of O to Io (where Io is the correct heating current at which the tube will be in a pre-heated condition) during a first, predetermined time period, and then from a current Io to a current Im (where Im is the optimum value for the heating current when the tube is normally operating), during a second predetermined time period.

REFERENCES:
patent: 3568004 (1971-03-01), Parker

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