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vacuum tube

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{adj: evacuated} emptied by being pumped out or having a vacuum created
"a highly evacuated glass tube"

{n: A battery} battery used to heat the filaments of a vacuum tube

{n: B battery} battery for supplying a constant positive voltage to the plate of a vacuum tube

{n: C battery} battery used to maintain the grid potential in a vacuum tube

{n: De Forest, Lee De Forest, Father of Radio} United States electrical engineer who in 1907 patented the first triode vacuum tube, which made it possible to detect and amplify radio waves (1873-1961)

{n: 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

{n: acorn tube} a small vacuum tube; used at high frequencies

{n: cathode-ray tube, CRT} 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

{n: distortion} a change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal)
"heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion"

{n: dropper, eye dropper} pipet consisting of a small tube with a vacuum bulb at one end for drawing liquid in and releasing it a drop at a time

{n: electron multiplier} a vacuum tube that amplifies a flow of electrons

{n: grid, control grid} an electrode placed between the cathode and anode of a vacuum tube to control the flow of electrons through the tube

{n: 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

{n: neon, Ne, atomic number 10} a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts

{n: plate} the positively charged electrode in a vacuum tube

{n: tickler coil} a small coil in series with the anode of a vacuum tube and coupled to the grid to provide feedback

{n: triode} a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which making amplification possible

{n: tube, vacuum tube, thermionic vacuum tube, thermionic tube, electron tube, thermionic valve} electronic device consisting of a system of electrodes arranged in an evacuated glass or metal envelope

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