Vacuum tube type

This time we are looking on the crossword clue for: Vacuum tube type.
it’s A 16 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: DIODE, TRIODE, CATHODERAY.

Last seen on: –Eugene Sheffer – King Feature Syndicate Crossword – Dec 21 2019
-Eugene Sheffer – King Feature Syndicate Crossword – Nov 25 2017