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Vacuum Tube (new & used)
Manufacturers & Services
In
electronics, a vacuum tube, electron tube (in North America), thermionic
valve, or just valve (elsewhere, especially in Britain) is a device
used to amplify, switch, otherwise modify, or create an electrical signal
by controlling the movement of electrons in a low-pressure space. Some
special function vacuum tubes are filled with low-pressure gas: these
are so-called soft valves (or tubes), as distinct from the hard vacuum
type which have the internal gas pressure reduced as far as possible.
Almost all depend on the thermal emission of electrons, hence thermionic.
Vacuum tubes were critical to the development of electronic technology,
which drove the expansion and commercialization of radio broadcasting,
television, radar, sound reproduction, large telephone networks, analog
and digital computers, and industrial process control. Some of these
applications pre-dated electronics, but it was the vacuum tube that
made them widespread and practical.
- Wikipedia
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- Tube Base Diagrams
- A Course in Radio Fundamentals-Vacuum Tubes
Sep 1942 QST
- Electrons on Parade
Tube Production Video by RCA c.1942
- NEETS Module 6 - Vacuum Tubes
- Vacuum Tube Vendors
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