I just got some Ei 12AX7 tubes from a seller on eBay. They are going for around $45-$50 per quad, and are really a great little tube. These are the pinched base version and were made, as you know, on the old Telefunken machinery. There is a lot of debate on the sound of these tubes, but the ones I received are dead quite and sound amazing. I really think you are buying a tube which is very close to the old smooth plate Telefunken for a little over $10.00 per tube, or about the same price as the modern production Russian and Chinese tubes..Tele's are now fetching over $50.00 per tube. If you're in the market for some nice 12AX7's, you might want to get a quad or two of these to put away. They aren't making these little guys anymore..and the seller can't have an infinite supply.