Editing Plate electrode (section)

==Construction==
The plate must dissipate heat created when the electrons hit it with a high velocity after being accelerated by the voltage between the plate and cathode.   Most of the waste power used in a vacuum tube is dissipated as heat by the plate.  In low power tubes it is usually given a black coating, and often has "fins" to help it radiate heat.  In power vacuum tubes used in radio transmitters, it is often made of a [[refractory metal]] like [[molybdenum]]. and is part of a large [[heat sink]] that projects through the glass or ceramic tube envelope and is cooled by [[Glowing anode|radiation cooling]], forced air or water.<ref>C H Gardner (1965) [http://www.r-type.org/static/story.htm The Story of the Valve], Radio Constructor (See particularly the section "Glass Base Construction")</ref><ref>Robert B. Tomer, ''Getting the most out of vacuum tubes'', Howard W. Sams, Indianapolis, USA 1960, Library of Congress card no. 60-13843, available on the Internet Archive.  Chapter 1</ref>