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A four-element electron tube containing an anode, cathode, control grid, and additional electrode.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Electronics) an electronic valve having four electrodes, namely a cathode, control grid, screen grid, and anode
2. (Electronics) (modifier) (of a transistor) having two terminals on the base or gate to improve the performance at high frequencies
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a vacuum tube containing four electrodes, usu. a plate, two grids, and a cathode.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||tetrode - a thermionic tube having four electrodes|
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