# 5965

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{{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](/source/triode)  [vacuum tube](/source/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](/source/Massachusetts_Institute_of_Technology) [Project Whirwind](/source/Whirlwind_I) memorandum, the tube was developed c.1953 for [IBM](/source/IBM) by [GE](/source/GE), primarily for use in the [IBM 701](/source/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](/source/Mullard%E2%80%93Philips_tube_designation) 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](/source/Vacuum_tube) logic module from a [700 series](/source/IBM_700%2F7000_series) IBM computer featuring 5965 tubes.]]

==See also==
* [7AK7](/source/7AK7), a popular type of tube found in early digital computers
* [25L6](/source/25L6), another type of tube found in early computers

==References==
{{reflist}}

Category:Computer vacuum tubes

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Adapted from the Wikipedia article [5965](https://en.wikipedia.org/wiki/5965) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/5965?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.