Definition of vacuum tube in English:

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vacuum tube

noun

A sealed glass tube containing a near-vacuum which allows the free passage of electric current.
Example sentences
  • A photocell is usually a vacuum tube with two electrodes.
  • In 1948 the vacuum tube was replaced by longer-lived solid-state transistors, marking the dawn of microelectronics.
  • We think of the 1950s as the golden era of the vacuum tube.
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