Ok, further to my adventures in audio nervosa tweakdom, I today finished hotrodding the Pace Car I use with my Wadia iPod transport. Here's what I did: I ordered several shunt modules from Paul Hynes + one serial supply. For the shunt modules I purchased separate R-core transformers. I installed all in an aluminum box. I then removed the Pace Car from its box, snipped the supply leads to the Superclock 4, and removed the 7805 and 7809 regulators. I then wired a 12V Hynes shunt to the Superclock, wired 9V and 5V shunts to the 78XX regulator inputs, and wired the remaining 12V serial supply to the 12V input to the Pace Car (I'm actually not sure this is even needed, but I don't know the Pace Car circuit).
So all in all, four Hynes supplies powering the Pace Car! Total cost was something of the order of 4 x $175 for the supplies + 3 x $40 for the transformers = $820.
My god! What a ~ s-w-e-e-t ~ upgrade! I have to say, Steve's Pace Car is one remarkable machine. I'm speechless. No grating digititis whatever, just soft, detailed, analogue-killing sound. I can hear the difference here as I type, one floor down. I'm now going to walk back upstairs and retrieve my jaw from the floor.