| The same concept led to his creating almost complete vacuums in thermionic tubes. |
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| This is the fundamental operating principle of vacuum tubes, once called thermionic tubes. |
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| It consists of a thermionic tube with a cathode, an anode and a third electrode which is called the collector or counter electrode. |
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| At the time it was the world's most powerful transmitter using thermionic valves. |
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| In the West transistors had long replaced the thermionic tube in audio circuits. |
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| The basic thermionic tube with three electrodes is called a triode in view of the number of electrodes. |
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| All this time the thermionic tube played a major part and went through a lot of development by large corporations to engineer a superior device. |
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| His work with the thermionic valve in 1904 and 1905 was important to the development of radio. |
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| Electricity can be generated by the thermionic effect, that is, the use of dissimilar metals can cause electrons to flow in the presence of heat. |
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| In 1914 the thermionic valve was in use as a receiver, but as a transmitter it was still in the experimental stage. |
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| The electromagnetic wave generator comprises a thermionic tube having a cathode, an anode and at least one grid. |
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| The thorium dispersion enhances thermionic electron emission, which in turn improves the starting characteristics of gas tungsten arc welding electrodes. |
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| The vacuum tubes used to create the effect of thermionic electrons and direct them and pack them. |
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| As their name suggests, thermionic valves need to be heated to work. |
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| There is one particular wartime project which is of considerable historical interest, since it involved the first large-scale use of thermionic valves for digital computation. |
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| To many people, the thermionic valve or electron tube is history. |
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| The other device was a type of proximity fuze using a photoelectric cell and thermionic amplifier. |
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| These methods are particularly adaptable for amplification of very weak impulses and require careful insulation and even special thermionic tubes for best results. |
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| Fleming called his device the thermionic valve because it used heat to control the flow of electricity just as a valve controls the flow of water. |
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| Their new wireless sets were built around thermionic valve or vacuum tube technology. |
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| A thermionic power converter has two electrodes. |
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| Study of the problem of bulb blackening led to the discovery of the Edison effect, thermionic emission and invention of the vacuum tube. |
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| In 1916 Ediswan set up the UK's first radio thermionic valve factory at Ponders End. |
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| This area, with nearby Brimsdown subsequently developed as a centre for the manufacture of thermionic valves, cathode ray tubes, etc. |
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| For a good thirty years, researchers have been looking for alternatives to classical thermionic emission sources, and have been working intensively to develop new «cold» electron sources. |
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| As for algorithms S I once had to reproduce a diagram of a thermionic valve. |
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| The age of electronics began in 1906 with Lee De Forest's invention of the vacuum tube, or, as the British described it, the thermionic valve. |
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| This work contains the principles of operation of The Thermionic Vacuum Tube, and coordinates the phenomena encountered in a study of this field. |
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