from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A tetrode with grid and plate potentials so arranged that plate current decreases when plate potential increases.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a tetrode in which the voltage on the screen grid is higher than that on the control grid, causing the plate current to decrease as plate voltage increases; was used in oscillators


Greek dunamis, power; see dynamic + -tron.
(American Heritage® Dictionary of the English Language, Fourth Edition)


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