pentagridn.

Brit.

/ˈpɛntəɡrɪd/, U.S.

/ˈpɛn(t)əˌɡrɪd/

Origin: Formed within English, by compounding. Etymons: penta- comb. form, grid n.

Etymology: < penta- comb. form + grid n.

Electronics.

A thermionic valve having five grids; a heptode. Frequently 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

1933 Wireless World 12 May 347/1 The Pentagrid Converter..has been recently developed in America.

1933 Wireless World 12 May 347/3 With the Pentagrid..the necessary coupling occurs within the valve and, by virtue of the screening, is entirely electronic in nature.

1950 P. Parker Electronics xiv. 549 Occasionally a frequency-changing valve..has a suppressor grid; it is then called a heptode or pentagrid.

1966 H. J. Reich et al. Theory & Applic. Active Devices vii. 165 Another useful tube structure is the five-grid or pentagrid tube, in which the five grids of helical construction are mounted between the cathode and the plate... Perhaps the most frequent application..has been in the mixer-oscillator section of radio receivers.

1999 Electronics Now 1 June 14 When five-tube superheterodyne circuits began to replace the four-tube tuned radio-frequency designs, the 6A7 pentagrid converter (also six-volts) began to appear.

This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022).

单词	pentagrid
释义	pentagridn. Brit. /ˈpɛntəɡrɪd/, U.S. /ˈpɛn(t)əˌɡrɪd/ Origin: Formed within English, by compounding. Etymons: penta- comb. form, grid n. Etymology: < penta- comb. form + grid n. Electronics. A thermionic valve having five grids; a heptode. Frequently 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 1933 Wireless World 12 May 347/1 The Pentagrid Converter..has been recently developed in America. 1933 Wireless World 12 May 347/3 With the Pentagrid..the necessary coupling occurs within the valve and, by virtue of the screening, is entirely electronic in nature. 1950 P. Parker Electronics xiv. 549 Occasionally a frequency-changing valve..has a suppressor grid; it is then called a heptode or pentagrid. 1966 H. J. Reich et al. Theory & Applic. Active Devices vii. 165 Another useful tube structure is the five-grid or pentagrid tube, in which the five grids of helical construction are mounted between the cathode and the plate... Perhaps the most frequent application..has been in the mixer-oscillator section of radio receivers. 1999 Electronics Now 1 June 14 When five-tube superheterodyne circuits began to replace the four-tube tuned radio-frequency designs, the 6A7 pentagrid converter (also six-volts) began to appear. This entry has been updated (OED Third Edition, September 2005; most recently modified version published online March 2022). < n.1933
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