heptode Radio.
(ˈhɛptəʊd)
[f. hepta- + -ode.]
A valve with seven electrodes. Also attrib.
| 1932 Post Office Electr. Engin. Jrnl. XXIV. 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. XIV. 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. XVII. 648 A circuit composing a heptode oscillator. |