Hi Mark,
I first tried the stock SMPS just to see how much it affected performance, definitely a drop in sound quality
I then tried basic LM317 which was better than the SMPS , I then added a cap multiplier which improved things further, I then tried ALW super reg and standard Teddy reg which was also pretty good but for me so far I got best results running from the 9v PH PR3 used to run the Duet, I just added an inductor onto the lead feeding the input of Superclock4, I was even going to try a battery
I'm going to build a Superteddy reg supply and see how this compares, I want to try it with the Caiman dac , Duet etc anyway , I've got most of the components so just need the bare pcb .
Its fun trying all this stuff out comparing results
Cheers,
Leo