Vintage tube suggestions


Need help with tube selection. What would you consider a great value 
(budget of $100 per tube) for 12AX7 vintage tubes? Application would 
be preamp, and possibly DAC.
markj941
Telefunken has a great 3D soundstage. I have tried lots of others but keep coming back to Tele. I use them in my pre amp, power amp and phono amp. Ymmv.

thanks rotaryphone Will any Telefunken 12AX7 do? Are there a variety to chose from?
IMHO, one of the best 12AX7 is the Mullard CV4004.  I have drawers full of tubes and these have always sounded great.
Telefunken Black Diamond ECC83?

I'm pretty sure that rotaryphone is talking about NOS Teles, not new production, which the Black Diamond Series is.