tetroden.adj.
/ˈtɛtrəʊd/, U.S. /ˈtɛˌtroʊd/ Zoology.† B. adj. Telegraphy.
A. n.
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1. A sponge-spicule with four equal rays in the same plane.
2. Electronics. A thermionic valve with four electrodes.
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the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > thermionic valve > [noun] > vacuum tube or thermionic valve
vacuum tube1859
trigger tube1894
audion1906
pliotron1915
diode1919
electron tube1919
negatron1919
pentode1919
power valve1919
tetrode1919
triode valve1919
magnetron1921
bright emitter1923
peanut valve1923
peanut1924
power tube1924
multiple valve1929
thyratron1929
heptode1932
hexode1933
pentagrid1933
acorn tube1934
octode1934
triode-pentode1936
triode-hexode1937
transitron1939
trochotron1947
steering diode1957
1919 W. H. Eccles in Electrician 18 Apr. 475/2 To be systematic I suggest ‘tetrode’ and ‘pentode’ for vacuum tubes with four or five electrodes.
1932 E. V. Appleton Thermionic Vacuum Tubes ix. 111 The five electrode tube or pentode possesses a screen grid as does the tetrode, but also has an additional grid situated between the anode and the screen grid.
1941 Electronic Engin. 14 385 The valves in this section are push-pull beam tetrodes.
1943 C. L. Boltz Basic Radio x. 164 The second method of suppressing the secondary emission is to align the control grid and screen very carefully so that the wires are opposite... Such a valve is a kinkless tetrode.
1962 D. F. Shaw Introd. Electronics xi. 234 The defect in the tetrode characteristics..is eliminated by the insertion of a third grid, called the suppressor grid, between the anode and the screen.
1976 Physics Bull. Aug. 359/3 (caption) This component is a new tetrode from Thomson-CSF.
Applied to a mode of multiplex telegraphy by which four messages can be transmitted along a wire simultaneously. Obsolete.
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society > communication > telecommunication > [adjective] > types of system
multiplex1873
quadruplex1874
diplex1878
sextuplex1879
simplex1884
diode1886
hexode1886
tetrode1886
triode1886
octuplex1893
selective1906
quadded1914
multiplexed1964
muxed1991
1886 W. H. Preece in Jrnl. Soc. Telegraph-engineers & Electricians 15 231 A two-way mode of working, or a mode by which two messages are practically sent at the same time, will be diode working, three-way triode, four-way tetrode, five-way penthode, and-six way [sic] hexode.
This entry has not yet been fully updated (first published 1911; most recently modified version published online March 2022).
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n.adj.1886