I'm just going to come right out and say it:
Those guys over there in Pakistan are just pigs.
Yes, I know: third-world conditions, extreme poverty, close to zero regulation and a desperate need to do whatever it takes to earn a living.
But they must realize just how shitty their working conditions are, all that toxic shit they're dealing with without much regard for the consequences. Pouring out all that toxic sludge right back into their own environment. They seem quite oblivious to all that.
Ugh.
On the other hand, I love this video showing making tubes by hand in China:
Similar working conditions; notice the dirt floors in some places. But these guys exercise much more care, and their construction techniques, while fairly primitive, are actually pretty exquisite. (Love those floral ceramic tube bases!)
They're making 100-watt power triodes; wonder what their mu is, and how much variation there is from tube to tube? Notice how the filaments are cut and bent without the use of a template.
The only part that makes me a bit queasy is when they're exposing themselves to strong RF fields when energizing the getters in the tubes. Other than that it seems like a pretty well-thought-out and executed process.