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Answer for the clue "Vacuum tube with three elements ", 6 letters:
triode

Alternative clues for the word triode

Usage examples of triode.

The breast insignia varied-a cogwheel, a triode circuit diagram, an integral dx, conventionalized waves and gram sheafs and thunderbolts-the heraldry of a government which at least nominally emphasized technology.

Those are where the black-hole triodes are generated that give you the I/O ports.