Definition of vacuum tube in English:

vacuum tube


  • A sealed glass tube containing a near-vacuum which allows the free passage of electric current.

    • ‘We think of the 1950s as the golden era of the vacuum tube.’
    • ‘I didn't know much about transistors because my education was during the days of vacuum tube.’
    • ‘In 1948 the vacuum tube was replaced by longer-lived solid-state transistors, marking the dawn of microelectronics.’
    • ‘It wasn't until the vacuum tube and the transistor were invented that true computers became feasible.’
    • ‘A photocell is usually a vacuum tube with two electrodes.’