When I visted Siegfried house for the first time, I asked him what would be a good reference to read to understand how to use OPAMP's, as I was eager to understand how the Orion crossover worked. He pulled out a large white book entitled "Walter G. Jung, editor, Op Amp Applications, Analog Devices, 2002" and said -- this is what you need. I purchased this and started reading -- not easy going, but a vertible gold mine of information. So I was convinced that I could make a preamp based on OPAMP's, epecially as I had built three sets of Jim Hagerman' Oboe.
INSIDE OF PREAMP
Basically, you are looking at a superb sounding Single Ended preamp that costs less than $150.00 US dollars to build. I am using a Burr Brown OPA2134 for the first stage, and an AD8620 for the second stage. I am using a Jim Hagerman Bugle Power supply and a Twistedpear Audio Joshua Tree Volume Control. My plan is to modify this preamp to use the Analog Devices AD8599 when it comes out.
Beautiful uncompressed and realistics sounds come from this preamp. I plan to make a killer RIAA stage and put everything in a beautiful box.