5965

The 5965 is a miniature twin triode vacuum tube (thermionic valve). One of its manufacturers, Sylvania, states that it was “designed for use in high-speed digital computers”.[1]

5965
ClassificationTriode
ServiceDigital computers
Height1+15⁄32 in (37 mm)
Diameter7⁄8 in (22 mm)
Cathode
Cathode typeUnipotential
Heater voltage6.3 V or 12.6 V
Heater current450 mA or 225 mA
Anode
Max voltage200 V
Max current100 mA
Socket connections

Pin 1 – Unit 2 Anode (Plate)
Pin 2 – Unit 2 Grid
Pin 3 – Unit 2 Cathode
Pin 4 – Unit 2 Heater
Pin 5 – Unit 1 Heater
Pin 6 – Unit 1 Anode (Plate)
Pin 7 – Unit 1 Grid
Pin 8 – Unit 1 Cathode
Pin 9 – Heater mid-tap

(bottom view)
References
https://web.archive.org/web/20230314212705/https://frank.pocnet.net/sheets/137/5/5965.pdf

According to an MIT Project Whirwind memorandum, the tube was developed for IBM by GE, primarily for use in the IBM 701 calculators, and was designated as a general-purpose triode tube.[2] The tube was also labeled as E180CC.[3]

See also
  • 7AK7, a popular type of tube found in early digital computers
  • 25L6, another type of tube found in early computers

References
  1. Sylvania. Engineering Data Service. 5965. November 1953.
  2. Frost, H. B. (May 4, 1953). "Memorandum M-2135: Some notes on current tube types" (PDF). MIT. p. 3. Archived from the original (PDF) on 28 March 2021. Retrieved 12 February 2024.
  3. Wyatt, Allan. "5965". The Valve Museum. Retrieved 12 February 2024. It is also labelled as a E180CC showing that the two Types are equivalent.
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