Editing UNIVAC I (section)

===Major physical features===
[[File:7AK7 vacuum tubes.jpg|thumb|[[7AK7]] vacuum tubes in a 1956 UNIVAC I computer]]
UNIVAC I used 6,103 [[vacuum tube]]s,<ref>The vacuum tubes used in the UNIVAC I were mostly of type [[25L6]] (3,947), but the machine also used tubes of type 6AK5 (412), [[7AK7]] (363), 6AU6 (57), 6BE6 (?), 6SN7 (264), 6X5 (?), 28D7 (274), 807 (27), 829B (47), 2050 (151), 5545 (?), 5651 (?), 5687 (14), 5915 (96), 6AL5 (199), 6AN5 (136), 6AH6 (?), 5V4 (?), 5R4 (?), 4D32 (?), 3C23 (64), and 8008 (?).</ref><ref>{{Cite book |url=https://archive.org/details/sim_electronic-industries-tele-tech_1954-03_13_3/page/n4/ |title=Tele-tech & Electronic Industries |date=1954-03-01 |publisher=Chilton Co.  |volume=13 |pages=3 |language=English |chapter=Totals: Germanium Diode Sales; Supply of Engineering Graduates - Computer Components |issue=3}}</ref> weighed {{Convert|16686|lb|ST MT|1}}, consumed 125 [[kilowatt|kW]],<ref>{{Cite web|url=http://www.ed-thelen.org/comp-hist/BRL61-u3.html#UNIVAC-I|title=UNIVAC I|last=Weik|first=Martin H.|date=March 1961|website=ed-thelen.org|series=A Third Survey of Domestic Electronic Digital Computing Systems}}</ref> and could perform about 1,905 operations per second running on a 2.25 [[megahertz|MHz]] clock. The Central Complex alone (i.e. the processor and memory unit) was 4.3 m by 2.4 m by 2.6 m high. The complete system occupied more than 35.5 m<sup>2</sup> (382&nbsp;ft<sup>2</sup>) of floor space.{{citation needed|date=July 2022}}