Cryptic crossword clue
A type of vacuum tube to deter conversion 7

The most common and most likely answer to this crossword clue is the 7 letter word TETRODE

T
E
T
R
O
D
E

Buddy explains!

The straight part
We know that "A type of vacuum tube" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a type of vacuum tube = tetrode.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does TETRODE mean?

TETRODE noun
  1. A thermionic valve similar to a triode with the addition of a screen grid to protect the control grid.
  2. A dynatron.
  3. A dual-gate MOSFET.

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