An electron tube containing a near-vacuum that allows the free passage of electric current.
- 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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Syllabification: vac·u·um tube
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