My father-in-law used to build tvs in the 50’s as a hobby. He saved a box of vacuum tubes that my mother-in-law is trying to get him to throw out. He is determined to hold on to them. Maybe I can get him to part with one! LOL!
Just visited ebay to see how muck those old tubes I tossed might have been worth. Probably not much - 110 for $25 are listed.
Although he had some that were HUGE - 2 to 3 inch diameter and 10 to 12 inches tall IIRC.