Vladika
SOC-14 1K
LOL! Also, to make a vacuum tube computer to replace even current day super computers would make them larger than a 100 Dton scout and they would be HORRIBLY unreliable. ANYONE who has spent anytime studying those old machines knows this.
They are horribly unreliable! And the heat given of is massive. (This could explain the energy requirements...)
My Dad owned a vending machines company when I was a kid. He had 1000s of tubes around and diagnostics was a real nightmare. (The best diagnostics seemed to have been "look for the blown valve" it's very visual. Problem is, it doesn't tell you WHY the tube blew in the first place.
I think HG_B is very correct. And spare parts? Maybe that's why the X Boat tender is so large for the ships it supports.
I seem to remember that the US Military thought highly of the Mig 15 IIRC, until they got their hands on one. Vac Tubes throughout.