The vacuum-tube is the first electron tube of type Triode. The vacuum-tube made it possible to carry out the electronic amplifying first .

History

The first electronic amplifier was produced in 1906 by the American inventor Lee De Forest, using the first version of one of its inventions: the vacuum-tube. In 1908, Lee De Forest improved the vacuum-tube by adding an electrode to him, thus giving rise to the first Triode.

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