| 单词 | pentode valve |
| 释义 | > as lemmaspentode valve A thermionic valve having five electrodes. Also pentode tube, pentode valve. 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 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. 1973 R. M. Whittle & J. Yarwood Exper. Physics for Students xi. 296 The values recorded..are for a pentode valve used for audio-frequency operation, generally as the output stage of an audio-frequency amplifier. 2001 R. W. Cahn Coming of Materials Sci. vii. 256 Lee DeForest invented the vacuum triode tube, and..it (and its successor, the pentode tube) displaced the short-lived semiconducting detector. < as lemmas |
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