Could museums help? ;-)
Maybe I'm being a little tongue-in-cheek with this.
But...I do know of one instance where quaint, abandoned
technology was 'borrowed' from a museum for modern use.
I'm too ashamed to explain the circumstances, but it's true.
BTW, when I lived in Ottawa, Ontario, the Science & Technology Museum there
had a room displaying actual, possibly still functional [depending if vacuum tubes
are still available for some] electronic computers dating from the 1950's upto the 1980's.
As an aside; there was an actual Atlas missile displayed outside; a donation, thanks to the USAF.
Oh, there is the need to find people who know how to operate those 'ancient' machines.
Nursing homes anyone?