File:RCA 24-A screen grid tube anode characteristics.png

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English: Graph of anode (plate) characteristic curves of the RCA 24-A tetrode vacuum tube, one of the first tetrodes which came out in 1929. It shows the plate current (Ib) as a function of plate voltage for different values of control grid voltage (EC2). The lowest curve shows the screen grid current (IC2). This early tetrode illustrates the negative resistance "kink" in the plate current (labeled "values unstable") caused by secondary emission of electrons from the plate, that caused instability and parasitic oscillations in early tetrodes. Modern tetrodes have a coating on the plate which suppresses secondary emission, eliminating the "kink".
Date
Source Retrieved March 20, 2015 from RCA Tube Handbook HB-3, Vol. 5 & 6, Receiving Tube Section Part 3, Radio Corporation of America, Harrison NJ, 1953, p. 24-A on https://archive.org/
Author Unknown authorUnknown author
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(Reusing this file)		 Creative Commons license: Public Domain Mark 1.0
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This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
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This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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