两极管由一根钨丝和一块金属板组成,钨丝被加热时放出电子,当电场方向合适时,这些电子便向金属板流动.
（这是最老式的电子两极管,玻璃罩子里可以看得见钨丝和金属电极,跟一个15瓦的小灯泡差不多,俺玩过,呵呵）
英语翻译The two-electrode tube consists of a tungsten filament,w
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