: an electron tube evacuated to a high degree of vacuum
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That model was unlike anything else on the market at the time, with separate amplifier circuits for cleaner separation in each channel, and a vacuum tube preamp stage for analog smoothness and warmth – sort of emulating an audiophile's full system setup.—New Atlas, 17 Feb. 2026 Those equations could be a blueprint for designing brighter lightbulbs and more powerful vacuum tubes.—Natalia Sánchez Loayza, Scientific American, 12 Feb. 2026 Officials say the same core technology could eventually support space launch systems and vacuum tube transport concepts.—Sujita Sinha, Interesting Engineering, 26 Dec. 2025 The transistors were smaller, used less power and generated less heat than previous vacuum tubes.—Christopher Howley, AZCentral.com, 23 Dec. 2025 See All Example Sentences for vacuum tube
: an electron tube from which most of the air has been removed
Medical Definition
vacuum tube
noun
: an electronic device in which conduction by electrons takes place through a vacuum within a sealed glass or metal container and which has various uses based on the controlled flow of electrons