| 摘要 |
<p>An electron tube device comprising an electron tube having a line cathode, and an electric power source for supplying power pulses to the line cathode, characterized in that the electron tube device comprises determination means for determining, during a power pulse, the value of a physical quantity which depends on the temperature of the line cathode, comparison means for comparing the value with a reference value and for supplying a control signal, and termination means to end the power pulse in dependence on the control signal. Consequently, the temperature of the line cathode is more stable.</p> |
