| 摘要 |
PROBLEM TO BE SOLVED: To prevent the degradation of characteristics and damages of an electron tube and alleviate loading of an power supply device by suppressing an excessive helix current flowing upon starting up of a power supply voltage, without causing deterioration of a maximum gain during normal operation of the electron tube such as a travelling wave tube. SOLUTION: The electron tube or a power supply device includes a detection circuit to detect current flowing in a helix electrode, a voltage restriction circuit which controls the potential difference between the helix electrode and an anode electrode to a prescribed voltage, and a switch which switches over whether to connect through the voltage restriction circuit or by short-circuiting between the helix electrode and the anode electrode according to the output of the detection circuit. COPYRIGHT: (C)2009,JPO&INPIT
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