They are spectacular. I have them in one of my systems and love them.
No tube is going to make Bruce sound good though.
Does anyone have experience to relate with the reissued Telefunken Black Diamond tubes?
I am specifically interested in their EL34s as Tube Depot has a sale going on ($54 ea) and my current set of one dozen reissued Tungsols may be getting into that phase of their life that having another set on hand might not be a bad idea.
What I did find by doing a google is that they are "made in partnership with JJ" and are manufactured in Slovakia.