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Glite Dictionary
acorn tube

acorn tube

9.8
A small vacuum tube shaped like an acorn used for high-frequency radio signals
  • noun
  • Archaic
translation icon : tubo bellota
  • Early radar systems often used acorn tubes for their high-frequency performance.

Examples

  • The distinctive shape of the acorn tube made it easy to spot in old radio equipment.

  • Collectors sometimes seek out acorn tubes as rare examples of vacuum tube technology.

  • The acorn tube is essential for high-frequency applications.

  • Can you hand me the acorn tube?

  • Many enthusiasts appreciate acorn tubes for their unique design and functionality in vintage electronics.

  • In high-frequency circuits, acorn tubes are praised for their reliability and efficiency.

  • The acorn tube is often sought by engineers for its ability to amplify signals at high frequencies.

Surface Forms

acorn tube singular
acorn tubes plural

Morphology

acorn + tube

As a noun–noun compound, 'acorn tube' is compositionally predictable: a B1 learner who knows 'acorn' and 'tube' can infer a tube that is acorn‑shaped or related to acorns. The precise technical sense (a small vacuum tube for high frequencies) requires specialist knowledge, but the core shape-based meaning is directly derivable from the constituents.

Etymology

Acorn tube is named for its shape. Early engineers made a tiny vacuum tube that looked like an acorn, so the name stuck and now it means a small tube used at 'high frequencies'.