In StackExchange ElectricalEngineering there is the question:
Were Vacuum Tube Computers made of Logic Gates?
Is StackExchange - Retrocomputing the more appropriate area?
Note: I have no idea if or when it is appropriate to move a question. How to move a question if that is even possible. Or how you are can inform people in one forum about a topic of interest in another forum.
Don't worry, I'll delete this question in 24 hours. It really comes down to how do you inform people of an interesting question in another forum.