Why aren't new vacuum tubes as good as old ones?

I think of the show called Bonanza, when it comes to carson city!

Hi Atmasphere, I am very interested with your finding of this new tube company in carson city, NV,, I believe if they have less dies, the tube will be made to last longer, and maybe be as good as ww 2 nos tubes, you said they were going to make the 12A-series tubes, I would be grateful if you could E-mail me information on them with pricing, if they have prices yet?, you can E-mail me thru audiogon here, thankyou Ralph.

Thanks for the info Atmasphere.

Ralph, Have you considered useing the tube company that you told me of, and mentioned here on this thread, as a possible replacement for the tubes you use now as stock tubes in your products?