[ARC5] Excellent WWII Vacuum Tube training film

[Robert Nickels]

Everyone here probably knows this stuff, but if you've got a friend or 
student who would be interested in knowing how vacuum tubes work, this 
one is hard to beat, and is one I hadn't seen before (including the eye 
candy at 6:48):

https://www.youtube.com/watch?v=ptB_4c5oulw

A veteran friend once told me the Navy method of teaching was to "tell 
'em what you're going to teach 'em, then teach 'em, and then tell 'em 
what you just taught 'em".    It works!

73, Bob W9RAN