An electron tube, also called ‘vacuum tube’, is an equipment used for controlling the flow of electrons through a vacuum in a sealed container. It’s usually made of a thin transparent glass in a cylindrical shape. It is said that the vacuum tube was first invented by John A. Fleming although with the help of concepts discovered by Thomas Alva Edison while he was working on the invention of the light bulb.
The improved version of the vacuum tube, that is a triode, was invented by Lee Deforest in 1906. This led to a great improvement in telephony such as the first coast-to-coast telephone line in the US. It also made significant in the field of computer technology by making electronic computing possible for the first time. These tubes can be charged either by batteries or by AC power. Like any other electronic device, this also requires cooling.
