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If it were possible to build a modern CPU with vacuum tubes instead of transistors, how large would it be? - Quora
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1950s Vacuum Tube Computer Replica Communicates Through USB | Hackaday
ENIAC Type Arithmetic System-Computer Museum
Single Bit Computer From Vacuum Tubes | Hackaday
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Amazon.com: Eniac Computer Vacuum Tubes, 18" x 15" - B&W Photo Art Print: Posters & Prints
What if a processor was made using modern vacuum tubes instead of 14 nm transistors, how large would it be? - Quora
Magnetic core memory from the '50s. Tubes! | Eletrônica
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