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However, tubes are still used in several specialized applications such as guitar amplifiers (also called a valve amp outside the U.

S.) and high power RF transmitters, as a display device in television sets and in microwave ovens.

The simplest vacuum tubes resemble incandescent light bulbs in that they have a filament sealed in a glass envelope which has been evacuated of all air.

When hot, the filament releases electrons into the vacuum: a process called thermionic emission.

Amps should only be serviced by a qualified technician.

On July 29th, 1923, James Charles Marshall was born in Kensington, England.

In the 1940s Jim began playing the drums professionally and performed regularly as a big band drummer.

This led to him opening his own drum school in 1953, teaching Mitch Mitchell (The Jimi Hendrix Experience), Micky Burt (Chas and Dave), Micky Waller (Little Richard), and Nicky Underwood (Ritchie Blackmore) among many others.

On most tubes, the leads are designed to plug into a tube socket for easy replacement.

For most purposes, the vacuum tube has been replaced by the much smaller and less expensive transistor, either as a discrete device or in an integrated circuit.

and Canadian English) or (thermionic) valve (outside North America) is a device generally used to amplify, or otherwise modify, a signal by controlling the movement of electrons in an evacuated space.

Vacuum tubes, or thermionic valves, are arrangements of electrodes in a vacuum within an insulating, temperature-resistant envelope.

Although the envelope was classically glass, power tubes often use ceramic and metal.

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