| 摘要 |
A method of aging a cathode of an evacuated cathode-ray tube having an electron gun including a heater, a cathode, a control electrode, a screen electrode and a focus electrode is proposed. The cathode and the focus electrode are interconnected. A first potential is applied to the heater while a second potential is applied to the cathode and focus electrode. At the same time, a third potential, more positive than the second potential, is applied to the control electrode. A fourth potential is applied to the screen electrode. A change in the fourth potential is sensed and the sensed change in the fourth potential is used to generate a control signal to vary the first potential to the heater. The aging process is terminated when the control signal causes a predetermined value of the first potential to be achieved. A structure to provide at least some of the above-indicated potentials as well as to sense the change in one of the potentials and to generate the control signal is also disclosed.
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