| 词条 | 7AK7 |
| 释义 |
|classification = Pentode |service = Digital computers |height_in = 3+5/32 |diameter_in = 1 +3/16 |weight_lbs = |cathode_type = Coated Unipotential |heater_voltage = 7.0 V (6.3 V nominal) |heater_current = 800 mA |max_dissipation = 8.5 W |max_voltage = 200 V |pinout = Pin 1 – Heater Pin 2 – Anode (Plate) Pin 3 – Grid 2 (Screen) Pin 4 – Grid 3 (Suppressor) Pin 5 – n.c. Pin 6 – Grid 1 (Control) Pin 7 – Cathode Pin 8 – Heater |reference = http://www.nj7p.org/Tubes/PDFs/Frank/137-Sylvania/7AK7.pdf }} The 7AK7 is a pentode vacuum tube (thermionic valve). According to its manufacturer, Sylvania, it was "designed for service in electronic computers".[1] The tube was developed in 1948,[2] designed at the request of L. D. Wilson for use in the Whirlwind computer.[3] Significant attention was directed towards its manufacturing process in order to ensure the part's reliability.[4] Dubbed the "computer tube",[5] it became the standard tube for all computers into the late 1950s.[2] References1. ^Sylvania. Engineering Data Service. 7AK7. July 1953. (Archived by WebCite® at https://www.webcitation.org/6hLZjuBJs) {{comp-hardware-stub}}2. ^1 {{cite book |first1=Tom |last1=Green|title=Bright Boys: The Making of Information Technology|publisher=CRC Press|year=2010|page=141|isbn=1568814763}} 3. ^{{cite conference |first=L. D.|last=Wilson|title=Tube Reliability in the Univac|book-title=Proceedings of the National Electronics Conference|volume=10|publisher=National Engineering Conference, Incorporated|year=1954|article=746|pages=699–703}} 4. ^David R. Brown, T. F. Clough, and P. Youtz. Investigation of 7AK7 Processing, Emporium, Pa., March 2, 1948.URI: http://hdl.handle.net/1721.3/38986 5. ^{{cite book |last1=Haigh |first1=Thomas |first2=Mark |last2=Priestley |first3=Crispin |last3=Ropefir |title=ENIAC in Action: Making and Remaking the Modern Computer |year= 2016 |publisher=MIT Press |isbn=9780262334419 | page=211}} 1 : Vacuum tubes |
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