heptoden.
/ˈhɛptəʊd/ Radio.
A valve with seven electrodes. Also attributive.
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
1932 Post Office Electr. Engin. Jrnl. 24 iv. 299/2 A complete electrode assembly of this type includes seven electrodes —hence the name ‘Heptode’ for the double-acting balanced thermionic valve.
1934 Times 11 Aug. 7/3 The days when one could speak simply of a screen-grid valve or a pentode are almost gone, for now there are in general use the double-diode-triode, the heptode, and many others with a double and even treble purpose.
1942 Electronic Engin. 14 629 The frequency changer follows normal practice..a separate triode with hexode or heptode comprising the local oscillator.
1943 Gloss. Terms Telecomm. (B.S.I.) 30 Heptode, a vacuum tube with seven electrodes normally comprising a hexode with an auxiliary anode between the first grid and the first screen grid or with a suppressor grid between the second screen grid and the (main) anode.
1945 Electronic Engin. 17 648 A circuit composing a heptode oscillator.
This entry has not yet been fully updated (first published 1976; most recently modified version published online September 2018).
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n.1932