thermionic valve

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thermionic valve

A technician carefully replaces a thermionic valve in an old radio.

Definition

Noun: * Thermionic Valve: An electronic device that controls the flow of electric current in a high vacuum between electrodes to which an electric potential difference has been applied. It operates on the principle of thermionic emission, where a heated cathode emits electrons that are attracted to a positively charged anode (plate). It is a fundamental component in early electronics, used for amplification, rectification, and switching.

Usage
  • The thermionic valve was the key component in radios, televisions, and computers before the invention of the transistor.
  • To amplify the weak radio signal, the circuit relied on a thermionic valve.
  • Collectors of vintage electronics often seek out devices that still contain original thermionic valves.
Advanced Usage
  • In Technical Descriptions: The term is often used in historical or technical contexts to describe the specific operating principle (thermionic emission) and physical construction (sealed glass/metal envelope, electrodes in a vacuum).
    • The design of the thermionic valve was critical for the development of long-distance telephony.
  • In Comparative Contexts: Used to contrast with solid-state devices like transistors and integrated circuits.
    • Unlike modern solid-state amplifiers, the vintage guitar amplifier uses thermionic valves to produce its characteristic warm, distorted sound.
Variants and Related Words
  • Vacuum Tube: The most common synonym in American English.
  • Valve: The common short form in British English (e.g., "valve amplifier").
  • Electron Tube: A more general technical term.
  • Thermionic Tube: A variant of the term.
  • Diode/Triode/Tetrode/Pentode: Specific types of thermionic valves, named for the number of electrodes they contain (two, three, four, or five).
Synonyms
  • Vacuum tube
  • Electron tube
  • Valve (British English)
  • Thermionic tube
Related Idioms/Phrases
  • Valve Sound/Valve Warmth: An idiom used in audio engineering and music to describe the characteristic sound quality attributed to amplifiers using thermionic valves, often described as richer or more natural compared to transistor-based amplification.
    • Audiophiles often prefer the valve warmth of a classic tube amplifier.
thermionic valve

A technician carefully replaces a thermionic valve in an old radio.

Noun
  1. electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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