However, the cathode-ray Thermionic tube remained the basis for television monitors and oscilloscopes until the early 21st century.
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19 Facts About Thermionic tube
2.
Amplification by vacuum Thermionic tube became practical only with Lee de Forest's 1907 invention of the three-terminal "audion" Thermionic tube, a crude form of what was to become the triode.
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3.
In 1906, Robert von Lieben filed for a patent for a cathode-ray Thermionic tube which used an external magnetic deflection coil and was intended for use as an amplifier in telephony equipment.
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4.
Thermionic tube showed that the addition of an electrostatic shield between the control grid and the plate could solve the problem.
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5.
Dynatron region of the screen grid Thermionic tube was eliminated by adding a grid between the screen grid and the plate to create the pentode.
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6.
The "acorn Thermionic tube" was very small, as was the metal-cased RCA nuvistor from 1959, about the size of a thimble.
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7.
The filament, no longer electrically connected to the Thermionic tube's electrodes, became simply known as a "heater", and could as well be powered by AC without any introduction of hum.
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8.
System widely used in Europe known as the Mullard–Philips Thermionic tube designation, extended to transistors, uses a letter, followed by one or more further letters, and a number.
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9.
Ignatron Thermionic tube was used in resistance welding equipment in the early 1970s.
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10.
The Thermionic tube base was filled with mercury and the Thermionic tube was used as a very high current switch.
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11.
Vacuum Thermionic tube needs an extremely high vacuum to avoid the consequences of generating positive ions within the Thermionic tube.
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12.
The Thermionic 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.
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13.
Gas and ions within the Thermionic tube contribute to grid current which can disturb operation of a vacuum-Thermionic tube circuit.
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14.
In spite of the advancing state of the art in power semiconductor technology, the vacuum Thermionic tube still has reliability and cost advantages for high-frequency RF power generation.
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15.
Cathode-ray Thermionic tube is a vacuum Thermionic tube used particularly for display purposes.
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16.
X-ray Thermionic tube is a type of cathode-ray Thermionic tube that generates X-rays when high voltage electrons hit the anode.
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17.
Such a Thermionic tube can be used for detection of ionizing radiation as an alternative to the Geiger–Muller Thermionic tube .
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18.
Cathode-ray Thermionic tube was the dominant display technology for televisions and computer monitors at the start of the 21st century.
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19.
The control grid in a Thermionic tube mediate this current flow by combining the small AC signal current with the grid's slightly negative value.
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