thermionic vacuum tube

DEFINITIONS OF: thermionic vacuum tube

1

n electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

Synonyms:
electron tube, thermionic tube, thermionic valve, tube, vacuum tube
Types:
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acorn tube
a small vacuum tube; used at high frequencies
diode, rectifying tube, rectifying valve
a thermionic tube having two electrodes; used as a rectifier
electron multiplier
a vacuum tube that amplifies a flow of electrons
gas-discharge tube
a tube in which an electric discharge takes place through a gas
klystron
an electron tube used to generate or amplify electromagnetic radiation in the microwave region by velocity modulation
magnetron
a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators
pentode
a thermionic tube having five electrodes
television pickup tube, television-camera tube
a tube that rapidly scans an optical image and converts it into electronic signals
tetrode
a thermionic tube having four electrodes
triode
a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible
X-ray tube
a vacuum tube containing a metal target onto which a beam of electrons is directed at high energy for the generation of X rays
CRT, cathode-ray tube
a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
glow lamp
a gas-discharge tube with a hot cathode; used in stroboscopes
glow tube
a gas-discharge tube consisting of a cold cathode and a diode in a tube filled with gas; the color of the glow depends on the particular gas
iconoscope
the first practical television-camera for picture pickup; invented in 1923 by Vladimir Kosma Zworykin
image orthicon, orthicon
a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
Type of:
electronic device
a device that accomplishes its purpose electronically
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