7AK7

7AK7
Classification Pentode
Service Digital computers
Height 3 532 in (80 mm)
Diameter 1 316 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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