| 单词 | hard valve |
| 释义 | > as lemmashard valve hard valve n. Electronics (now chiefly historical) a thermionic valve or tube with a hard vacuum, or evacuated sufficiently for any remaining gas not to affect its performance; cf. sense A. 25. ΚΠ 1917 Wireless World 5 219/1 The ‘soft’ valve will require a lower voltage battery in the plate circuit than with a ‘hard’ valve... Some very ‘hard’ valves are at present being successfully used in which a high voltage direct current dynamo is used in the plate circuit. 1953 F. G. Spreadbury Design Electronic Measuring Instruments 16 Most instruments employ hard valves and make use of rectification. 2003 W. D. Hackmann in J. L. Heilbron Oxf. Compan. Hist. Mod. Sci. 819/2 In 1913, Harold Arnold of the American Western Electric Company made the first successful high-vacuum or ‘hard’ valve. < as lemmas |
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