Wot Si says...

Les's PSU is a take on Simons original, which with the new cap I'm running at 20V, significant over the 15V stock but improves things no end.
Wouldn't want to go much higher, 20V is enough folks.

So the cap mod to your Young, get a linear PSU (seriously) and sit back knowing you have many K's worth of Dac.
Heard mine directly compared to a Naim Dac and the dealers face was a picture...ended up putting and XPS on it to show its superiority..and it was different rather than better.
Honestly, went in with the cash to buy the Naim, came away happy with my Young.