Crossword puzzle clue "vacuum tube filler"

Here are the possible solutions for vacuum tube filler clue

Answer
Clue
Relevancy
argon
Clue
Vacuum tube filler
Vacuum tube gas
Definition
an inert gaseous element
anode
Clue
Vacuum tube part
___ dark space (region in a vacuum tube)
Vacuum tube part.
Definition
a positively charged electrode
anodes
Clue
Vacuum tube terminals
Vacuum tube parts
Definition
ANODE, a positively charged electrode
argo
Clue
Gas in a vacuum tube

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