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tickler coil

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noun Electronics, Radio.
  1. the coil by which the plate circuit of a vacuum tube is inductively coupled with the grid circuit in the process of regeneration.

Origin of tickler coil

First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for tickler coil

tickler coil

noun
  1. a small inductance coil connected in series in the anode circuit of a valve and magnetically coupled to a coil in the grid circuit to provide feedback
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012