Hears about extremely old valves - Crossword Clue

Below are possible answers for the crossword clue Hears about extremely old valves.

7 letter answer(s) to hears about extremely old valves

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

Other crossword clues with similar answers to 'Hears about extremely old valves'

Old TV tubes
Some vacuum tubes

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