Thanks one and all. @jab, I know what you mean, but I'll be okay ;-) . I have only a coupla AX and AT in my RIAA phono amp (a Herron), my line stage using a pair of 7JD8, which are cheap. I'm not necessarily going to buy Telefunkens, but I want to know about them in case I find some for cheap. I recently worked with a bassist who is also a ham operator, and he tells me he has a large stash of vintage tubes. I'm gonna go have a look!
Telefunken Tube Information Sources?
Can those who are deep into vacuum tubes direct me to the best (The best Jerry, the best) sources of information on small signal Telefunken tubes, particularly the 12AX7 and 12AT7? I see them priced from reasonable to VERY expensive, and I don't even know the desirability of the ribbed vs. smooth plate versions. I gotta finally educate myself!