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Old vacuum tube
Answer for the clue "Old vacuum tube ", 6 letters:
triode
Alternative clues for the word triode
Word definitions for triode in dictionaries
Wiktionary
Word definitions in Wiktionary
n. A thermionic valve containing an anode, a cathode, and a control grid; small changes to the charge on the grid control the flow from cathode to anode which makes amplification possible
WordNet
Word definitions in WordNet
n. a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible
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.