At least one hobbiest designed and built vacuum tube computer was built after 2000. It is probably still runningtoday.
The ABC recreation vacuum tube computer at Ames, Iowa still runs today as a museum exhibit.
Four panels of the original ENIAC are still running today as a museum exhibit.
The last UNIVAC I was shutdown in 1971 by a Tennessee insurance company that had used it for over 13 years.
The last SAGE air defense AN/FSQ-7 vacuum tube computer was shutdown in 1986.
Vacuum tube, roughly from 1940s to 1958.
A vacuum tube is simply a tube with no oxygen nor carbon dioxide in it (aka no air).
The IBM 701 vacuum tube computer was announced May 21, 1952. It had 2K words 36 bits long (~9K bytes) of Williams Tube CRT DRAM.
Kilobytes and vacuum tubes are not in the same category. At best, a twin triode vacuum tube is a single flip-flop and can hold 1 bit of information, making a vacuum tube about 0.000122 of a kilobyte.
1940s to 1958: vacuum tube computers, primary I/O magnetic tape or punched cards.
the vacuum tube
vacuum tube computers
Vacuum tube, roughly from 1940s to 1958.
It means that the glass envelope has leaked and is no longer a vacuum. Air inside has oxidized the getter. They generally no longer work in this condition.
cathode-ray tube
Computer tubes, also known as vacuum tube computers are programmable computers that uses vacuum tube logic circuitry. They were used to solve computational problems much like modern day computers.
Vacuum tubes are neither useful nor advantageous in modern computers. These were replaced decades ago by the integrated circuit.
A vacuum tube is simply a tube with no oxygen nor carbon dioxide in it (aka no air).
Millman's theorem
The IBM RAMAC 350, which was part of the IBM 305 vacuum tube computer publicly announced on September 14, 1956.
who made the vacuum tubes
The IBM 701 vacuum tube computer was announced May 21, 1952. It had 2K words 36 bits long (~9K bytes) of Williams Tube CRT DRAM.