基于真空管技术，三极管提供了使用当前电流打开或关闭一个电路能力。
Built on vacuum tube technology, the triode provided the ability to turn an electrical circuit on or off using current flow.
在那个时候唯一可靠的真空管就是Western Electric 中继器三极管，而如果需要变阻器时，就用金属丝缠在木卷轴上自己做一个。
In those days the only reliable vacuum tube was the Western Electric repeater triode, and if one needed a variable resistance he wound a lot of wire on a wooden spool.
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