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electron tube
Also known as a valve, an evacuated glass or metal tube which may contain gas at low pressure, through which electrons flow between two or more electrodes. A heated filament, the cathode, emits electrons which are attracted to the positively-charged anode. By varying the voltage on intermediate (grid) electrodes, the electron flow can be regulated and the tube made to work as an amplifier.
Related categories
• ELECTRICITY AND MAGNETISM• ELECTRONICS AND SEMICONDUCTORS
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