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Other reasons for using a top cap include improving stability by reducing grid-to-anode capacitance, improved high-frequency performance, keeping a very high plate voltage away from lower voltages, and accommodating one more electrode than allowed by the base.

There was even an occasional design that had two top cap connections.

is a free of charge integrated software tool based on the Monte-Carlo simulation method.

It permits statistical modelling of different radio interference scenarios for performing sharing and compatibility studies between radiocommunications systems in the same or adjacent frequency bands.

Tubes have different functions, such as cathode ray tubes which create a beam of electrons for display purposes (such as the television picture tube) in addition to more specialized functions such as electron microscopy and electron beam lithography. Phototubes and photomultipliers rely on electron flow through a vacuum, though in those cases electron emission from the cathode depends on energy from photons rather than thermionic emission.

Since these sorts of "vacuum tubes" have functions other than electronic amplification and rectification they are described in their own articles.

Tubes with grids can be used for many purposes, including amplification, rectification, switching, oscillation, and display.

Invented in 1904 by John Ambrose Fleming, vacuum tubes were a basic component for electronics throughout the first half of the twentieth century, which saw the diffusion of radio, television, radar, sound reinforcement, sound recording and reproduction, large telephone networks, analog and digital computers, and industrial process control.

Most vacuum tubes have a limited lifetime, due to the filament or heater burning out or other failure modes, so they are made as replaceable units; the electrode leads connect to pins on the tube's base which plug into a tube socket.

This type is called a thermionic tube or thermionic valve.

A phototube, however, achieves electron emission through the photoelectric effect.

However, there are still a few applications for which tubes are preferred to semiconductors; for example, the magnetron used in microwave ovens, and certain high-frequency amplifiers.

One classification of vacuum tubes is by the number of active electrodes, (neglecting the filament or heater).

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