And when the tube subject arises this video can teach you to make your own

FASCINATING !

LOL nice. Yea I think I can pull that off.  I watched that video pt 1 and 2,3. then I watched one of a tube manufacturing facility in England around the 1920's.  I was wondering... who taught that frenchman how to hand make vacumetubes if they were being mass produced like soda pop by the 20's. Very cool. Maybe I could get him to make one for me.