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I believe that after the light bulb was finished and promoted to prime time, Edison

experimented on a light bulb with a second electrode inside it. This gave him the

vacuum diode, and it wasn't long before Lee DeForest came along and added yet

a 3rd element inside the bulb, which controlled the flow of current between the

first two. That enhancement is described as the 'triode', which immediately had

all kinds of applications as an oscillator and a small-signal amplifier.

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11y ago

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