This paper describes a method which can effectively improve the brightness of the conventional triode electron gun by reducing the distance between the anode and the grid cap.

本文通过试验论述了缩短三极电子枪阳极与栅极的间距是提高低压电子枪亮度的有效方法。

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But a few researchers, seeing the analogy between them, tried to put a grid into the crystal detector to turn it, too, into an amplifying triode.

ECONOMIST: The middle age of the transistor