Just a little story.... I've always been of the mindset that NOS tubes where all hype and for gear snobs exclusively. Driving around the other day and pass a TV repair place. Curiosity got the best of me and I checked it out, and got a NOS 1968 Westinghouse 12AX7 for $5. Being as skeptical as I was, especially as it going into a hybrid as a single preamp tube, I didn't expect much. Wow. I now have a new amp....that sounds amazing. Tamed all the probs I was having before, even after trying many others (last one was a JJ that died after 3 months, EH was the best of the lot). I'm think a believer now....or just really lucky. What is/was the difference in the manufacturing process? Why can't they make good tubes now? What's so different?