{{Short description|Twin triode vacuum tube}} {{Infobox vacuum tube |classification = Triode <!-- Mandatory --> |service = Digital computers
|height_in = 1+15/32 <!-- inches --> |diameter_in = 7/8 <!-- inches -->
<!-- Cathode --> |cathode_type = Unipotential <!-- Mandatory --> |heater_voltage = 6.3 V or 12.6 V |heater_current = 450 mA or 225 mA
<!-- Anode --> <!-- use either max_dissipation or max_current --> |max_current = 100 mA |max_voltage = 200 V
<!-- Socket Connections --> |pinout = thumb|9A Pin 1 – Unit 2 Anode (Plate) <br /> Pin 2 – Unit 2 Grid <br /> Pin 3 – Unit 2 Cathode <br /> Pin 4 – Unit 2 Heater <br /> Pin 5 – Unit 1 Heater <br /> Pin 6 – Unit 1 Anode (Plate) <br /> Pin 7 – Unit 1 Grid <br /> Pin 8 – Unit 1 Cathode <br /> Pin 9 – Heater mid-tap
(bottom view)
|reference = https://web.archive.org/web/20230314212705/https://frank.pocnet.net/sheets/137/5/5965.pdf }}
The '''5965''' is a miniature twin triode vacuum tube (thermionic valve) "designed for use in high-speed digital computers".<ref>Sylvania. [https://web.archive.org/web/20230314212705/https://frank.pocnet.net/sheets/137/5/5965.pdf Engineering Data Service. 5965]. November 1953.</ref>
According to an MIT Project Whirwind memorandum, the tube was developed c.1953 for IBM by GE, primarily for use in the IBM 701 computer, and was designated as a general-purpose triode tube.<ref>{{cite web |last1=Frost |first1=H. B. |title=Memorandum M-2135: Some notes on current tube types |url=http://bitsavers.informatik.uni-stuttgart.de/pdf/mit/whirlwind/M-series/M-2135_Some_Notes_on_Current_Tube_Types_May53.pdf |publisher=MIT |access-date=12 February 2024 |archive-url=https://web.archive.org/web/20210328194511/http://bitsavers.informatik.uni-stuttgart.de/pdf/mit/whirlwind/M-series/M-2135_Some_Notes_on_Current_Tube_Types_May53.pdf |archive-date=28 March 2021 |page=3 |date=May 4, 1953}}</ref> In European use the tube was labelled E180CC; sometimes the same tube was labelled with both names.<ref>{{cite web |last1=Wyatt |first1=Allan |title=5965 |url=http://www.r-type.org/exhib/abh0020.htm |publisher=The Valve Museum |date=27 December 2012|quote="It is also labelled as a E180CC showing that the two Types are equivalent."}}</ref>
[[File:IBM 700 logic module.jpg|thumb|Vacuum tube logic module from a 700 series IBM computer featuring 5965 tubes.]]
==See also== * 7AK7, a popular type of tube found in early digital computers * 25L6, another type of tube found in early computers
==References== {{reflist}}
Category:Computer vacuum tubes