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The thermionic vacuum tube and its applications . iver. Its operat-FiG. 127.—Western Elec- ing filament current and voltage are 1.1trie Receiving Tube, amperes and 2.5 volts, and its amplifica-Length: 10 cms. ^
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The History, Working, and Applications of Vacuum Tubes - Science Struck
The History, Working, and Applications of Vacuum Tubes - Science Struck