Frank,
Your "control amplifier" looks like a great product, but I'm surprised that, with all the great preamps you build, you have made this integrated without a preamp stage. I noticed the design goals you have set for your pre-amps in your post to Tyson below, and how they generally aren't achieved using passives. So, now I'm confused. Doesn't the control amplifier use a passive? Not trying to be cute or smart, just wondering if I'm missing something.
Thanks.