They are real vintage NOS tubes in original boxes made back in 90s in EI tube factory in Nis, Serbia. If you like sound of Telefunken's smooth plates ECC83 12AX7, you'll like these too, because they are (almost) exact copy. The only differences are in thickness of halo getter and in "staples" which are facing each other. I have few 100 pcs boxes of these tubes and I had enough time last few months to carefully measure them on my.Metrix and Tesla tube testers for plate currents and Hickok for transconductance. And to make platinum matched pairs with balanced triode sections.
You can find them rebranded Telefunken, Philips and Siemens, because all three factories had contracts with EI. You can also find them relabeled Telefunken with diamond mark on the bottom last few years!
Diamond bottom is not proof any more.. I collect tubes and tube gear for more then 30 years and I start to sell recently, please be sure to check my other items and visit my store for more rare NOS tubes and parts. I really do care about your satisfaction and Ill do my best to solve any kind of problem. I have more than 200000 NOS tubes in stock and just small part is listed here, if you are interested in any specific tube or part, please send me message. The item "ECC83 12AX7 EI Yugoslavia Telefunken Long Smooth Plates 17mm NOS Matched Pair" is in sale since Saturday, October 3, 2015.
This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Parts & Accessories\Vintage Tubes & Tube Sockets".rs" and is located in Belgrade. This item can be shipped worldwide.