I don't think people really tube roll Shindo preamps. I know that was an attractive point of the Aureigies L I purchased. Not messing around with power cords or tubes--just leaving it voiced as it was supposed to be.
That said, I believe I've read the original 12ax7 are Telefunken, not positive though.
That said, I believe I've read the original 12ax7 are Telefunken, not positive though.