This article has the answer of the question that I was on my mind since long it was about the premp design they promise but yet not delivered. I search a lot about this design and finally I got it from bestessay com while I was taking help from them on my final year project.
Second of all, as much as a Diezel preamp would be a tantalizing prospect, I feel the powerstage of the Diezels is a HUGE component of what makes their sonic alchemy so amazingly perfect (to my ears). So, regardless of the preamps perfection, which if ever created would be "perfect" as to be expected, it would only be 50% of the equation. That's leaving a lot up in the air when it comes to getting what we think we might "expect" from such a preamp.
Formidable project for sure. I opt to just buy all the Diezels and keep it simple