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Why Can't Tubes Be Mass-Produced Cheaply?

I often read that old tubes manufactured from the 60's or earlier are collectible items and often much sought after, and new tubes are not as valuable. Reasons cited are that these older tubes are a rare species, and they often sound 'better' and hence the hefty price tag on them. I am puzzled as to how these older tubes are different from the new ones and why they are better-sounding. Why can't technology today produce tubes that are similiar in quality to those in the yesteryears, or even better them? After all vacuum tubes, electron tubes or valve tube(where they call it in Britain) are electronic components made up by plates and filament. What happens if these old tubes become extinct? Why are there still so many of these old tubes available for sale although it has been almost 4 decades since they were manufactured? I mean once these tubes have run out of life they will basically be disposed off.

Pardon my ignorance as I cannot seem to find any discussion on this matter elsewhere. Any opinions would be much appreciated.
ryder

Showing 2 responses by sugarbrie

sugarbrie
3,854 posts
 
My mother was the one of the highest paid workers on the Sylvania tube assembly line for many years. She could do all the jobs from start to finish and would train the new workers. She worked there from 1943 to 1957. She is 83 now.

You guys will cry because she says they use to throw out tubes that were absolutely perfect in every way, except the Sylvania printed label on the glass or the base was crooked, smeared, incomplete, etc. Too late to fish through their trash...LOL !!
sugarbrie
3,854 posts
 
Tested as NOS is more likely, not actually NOS.

I do own a few tubes I know to be NOS only because I have owned them since before the internet and AudiogoN existed; and I knew the person I bought them from had owned them for decades. I may only be the second owner. The boxes even look like new.
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