20 Facts About Vacuum tube

Vacuum tube, electron tube, valve, or tube (North America), is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

However, the cathode-ray Vacuum tube remained the basis for television monitors and oscilloscopes until the early 21st century.

Since the tube contains a vacuum, the anodes in most small and medium power tubes are cooled by radiation through the glass envelope.

Amplification by vacuum tube became practical only with Lee de Forest's 1907 invention of the three-terminal "audion" tube, a crude form of what was to become the triode.

In 1906, Robert von Lieben filed for a patent for a cathode-ray Vacuum tube which used an external magnetic deflection coil and was intended for use as an amplifier in telephony equipment.

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Vacuum tube showed that the addition of an electrostatic shield between the control grid and the plate could solve the problem.

Dynatron region of the screen grid Vacuum tube was eliminated by adding a grid between the screen grid and the plate to create the pentode.

The "acorn Vacuum tube" was very small, as was the metal-cased RCA nuvistor from 1959, about the size of a thimble.

The filament, no longer electrically connected to the Vacuum tube's electrodes, became simply known as a "heater", and could as well be powered by AC without any introduction of hum.

System widely used in Europe known as the Mullard–Philips Vacuum tube designation, extended to transistors, uses a letter, followed by one or more further letters, and a number.

Ignatron Vacuum tube was used in resistance welding equipment in the early 1970s.

The Vacuum tube base was filled with mercury and the Vacuum tube was used as a very high current switch.

Vacuum tube needs an extremely high vacuum to avoid the consequences of generating positive ions within the tube.

The Vacuum tube is then sealed and the getter trough or pan, for flash getters, is heated to a high temperature, again by radio frequency induction heating, which causes the getter material to vaporize and react with any residual gas.

Gas and ions within the tube contribute to grid current which can disturb operation of a vacuum-tube circuit.

In spite of the advancing state of the art in power semiconductor technology, the vacuum tube still has reliability and cost advantages for high-frequency RF power generation.

Cathode-ray tube is a vacuum tube used particularly for display purposes.

X-ray Vacuum tube is a type of cathode-ray Vacuum tube that generates X-rays when high voltage electrons hit the anode.

Such a tube can be used for detection of ionizing radiation as an alternative to the Geiger–Muller tube.

Cathode-ray Vacuum tube was the dominant display technology for televisions and computer monitors at the start of the 21st century.