octoden.
/ˈɒktəʊd/, U.S. /ˈɑkˌtoʊd/ Electronics.
A thermionic valve with eight electrodes, used esp. as a frequency changer in a superheterodyne receiver. Now rare.
ΘΚΠ
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
1934 A. W. Haslett Radio Round World 191 There are many more complicated types of valve, ranging up to the octode which has eight different components instead of only three.
1961 Amateur Radio Handbk. (ed. 3) ii. 58/2 When provided with an additional grid used as a suppressor it [sc. the heptode] was referred to as an octode.
2000 C. E. Miller Valve Radio & Audio Repair Handbk. (ed. 2) xi. 61/2 Another valve..is the octode, in which an extra grid (G6) is placed between G5 and anode, where it acts like the suppressor grid in a pentode.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).
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n.1934