VACUUM TUBES


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VACUUM TUBES
1010604VACUUM TUBESMost people consider vacuum tubes to be electronic devices; however, they are very much electromechanical devices. A vacuum tube takes advantage of the fact that a glowing filament, when properly biased, will emit electrons. Figure 14-1 shows a demonstration of this phenomenon. The glowing filament is a piece of coiled nichrome wire. When the switch is closed, the filament starts to glow and a voltage can be observed on the voltmeter. When the switch is opened, the filam…
Citation
Brian S. Elliott: Electromechanical Devices & Components Illustrated Sourcebook. VACUUM TUBES, Chapter (McGraw-Hill Professional, 2007), AccessEngineering Export