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The Clue

Some vacuum tubes (7 letter answer)

The Answer

TRIODES

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Notes

The answer TRIODES is so rare that it appears less than once every 2900 puzzles.

Related Clues

Electron tubes
Vacuum tubes
Old TV tubes

Definition

TRIODE as a noun:

1. a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible