| 7AK7 | |
|---|---|
| Classification | Pentode |
| Service | Digital computers |
| Height | 3+5⁄32 in (80 mm) |
| Diameter | 1+3⁄16 in (30 mm) |
| Cathode | |
| Cathode type | Coated Unipotential |
| Heater voltage | 7.0 V (6.3 V nominal) |
| Heater current | 800 mA |
| Anode | |
| Max dissipation Watts | 8.5 W |
| Max voltage | 200 V |
| Socket connections | |
 Pin 1 – Heater | |
| References | |
| https://web.archive.org/web/20221114011216/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".
The tube was developed in 1948, designed at the request of L. D. Wilson for use in the Whirlwind computer. Significant attention was directed towards its manufacturing process in order to ensure the part's reliability. Dubbed the "computer tube", it became a popular tube for computers for a while. IBM, however, switched to more compact miniature tubes, starting with the IBM 604 in 1948.
See also
References
- Sylvania. Engineering Data Service. 7AK7. July 1953.
- ^ Green, Tom (2010). Bright Boys: The Making of Information Technology. CRC Press. p. 141. ISBN 978-1568814766.
- Wilson, L. D. (1954). "Tube Reliability in the Univac". Proceedings of the National Electronics Conference. Vol. 10. National Engineering Conference, Incorporated. pp. 699–703.
- 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
- Haigh, Thomas; Priestley, Mark; Ropefir, Crispin (2016). ENIAC in Action: Making and Remaking the Modern Computer. MIT Press. p. 211. ISBN 9780262334419.
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