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A high-vacuum diode designed to serve as a rectifier in appliances requiring high voltage and low current.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a vacuum diode designed for rectification of industrial-frequency alternating current. Kenotrons are used in rectifiers of radio-receiving and amplifying and measuring apparatus, as well as X-ray equipment. Low-voltage kenotrons (rated inverse voltage at the anode up to 2 kilovolts [kV]; rated direct current up to several amperes) have directly or indirectly heated oxide cathodes and blackened or etched ribbed anodes (usually two). High-voltage kenotrons (voltage up to 100 kV, current up to 500 milliamperes) have an oxide or carbonized cathode and also one blackened ribbed anode. With the development of semiconductor technology, kenotrons are gradually being replaced by semiconductor diodes.


Batushev, G. A. Elektronnye pribory. Moscow, 1969.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.