I'm thinking the same way as Albertporter. I can't ever remember hearing of them actually making one. Atma-Sphere may know. Also whether the tube says Made in Germany on it might give you a better idea.
Telefunken 6AS7
Anyone have any listening experience with these tubes? I am currently running RCA's in my OTL amp and was wondering if changing to these are going to give a wow factor, or just a different sound. They a very expensive at $700.00 - $800.00 for a quad of NOS. Or are they just pricy because they are a collector's item (which I am not interested in)?