A sealed glass tube containing a near-vacuum which allows the free passage of electric current.
More 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.
Definition of vacuum tube in:
- The US English dictionary