7AK7

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
8V-L-O

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
References
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]

References

  1. ↑ Sylvania. Engineering Data Service. 7AK7. July 1953. (Archived by WebCite® at https://www.webcitation.org/6hLZjuBJs)
  2. 1 2 Green, Tom (2010). Bright Boys: The Making of Information Technology. CRC Press. p. 141. ISBN 1568814763.
  3. ↑ Wilson, L. D. (1954). "Tube Reliability in the Univac". Proceedings of the National Electronics Conference. 10. National Engineering Conference, Incorporated. pp. 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. ↑ 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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