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tickler coil

noun, Electronics, Radio.
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
1920-25 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tickler-coil

tickler coil

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
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