Since the second generation transistorized computers there has been no use of vacuum tubes in computers except for one thing, CRT displays. In the last few years even that has been eliminated by modern flat panel LCD & LED displays, which are much lighter and less power hungry than CRT displays were.
Computer tubes, also known as vacuum tube computers are programmable computers that uses vacuum tube logic circuitry. They were used to solve computational problems much like modern day computers.
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Neon signs, and vacuum tubes, wave meter tubes, and helium neon lasers.
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No vacuum tubes on the Dakota. It uses electric servos.
Vacuum tubes still find uses where solid-state devices have not been developed, are impractical, or where a tube has superior performance, as with some devices in professional audio and high-power radio transmitters. Tubes are still produced for such applications.
A transistor is a solid state electronic device that replaced vacuum tubes for most uses.
Electronic computer is may faster and smaller than the first developed computer. Electronic computers today uses small electronic devices and integrated circuits. Long time ago they use vacuum tubes which are huge.
The rotary switch uses the engine vacuum system to operate the diverter "flap". If it is stuck in defrost mode then you have a vacuum problem... It can either be from the source (not generating vacuum), or in the transmission of the vacuum (the small plastic tubes). These tubes are prone to dry-rot/cracking causing them to loose their capacity to transmit the negative pressure.
Neon is used in lighting, most commonly known for its use in neon signs. It is also used in vacuum tubes, high-voltage indicators, television tubes, and helium-neon lasers.
Thermionic emission is commonly used in devices such as vacuum tubes and cathode ray tubes to generate and control electron beams. It is also used in some types of electron microscopes, x-ray tubes, and microwave tubes. Additionally, it is utilized in some types of detectors and ionization gauges.