Two (2) fully tested NOS tubes, platinum matched pair of rare ECC83 12AX7 Lorenz Stuttgart.
NOS - New Old Stock
NIB - New In Original Boxes
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.
EI made in Yugoslavia on genuine Telefunken made tooling machines .
They are real vintage NOS tubes in original boxes made back in late 80s - early 90s in EI tube factory in Nis, Serbia. (Elektronska Industrija Nis)
If you want to know more about Telefunken ECC83 12AX7 and different types of smooth plate and ribbed plate versions you should read this article: www.tubes.rs/ecc83-telefunken-12ax7/