How vacuum tubes are made

Ok, I've been talking about upgrades I'm making to my tube based 2 channel stereo, and I ran across this video. From a manufacturing viewpoint, this is really labor intensive and insane to imagine how they can train employees to build these things with any consistent quality. From a tube audio fans view point this is really cool. Tubes were built by the thousands starting in the 1930's and were vital components to almost everything built (TV's to airplane electronics) till the 1960's when solid state became the new standard. Enjoy the video.