The smart guys had always dabbled in music production ,where a remix of a remix of a pinched sample could see you hit gold on the underground club scene,by the time the pre-cursor chemicals for MDMA (extascy) stopped being produced in quantity that was the end of the end of the good old days of rave and club culture here. For a while it was like the goose that layed the golden egg ,but that bubble burst too when all the bedroom DJ's realised that aside from playing at parties for their friends ,there really wasnt much money to be made from it. The hifi shop I worked at in the early 2000's took advantage of the reemergence of the Dj scene around that time ,initially it was just a few big old reliables like Technics ,Pioneer,Vestax ,but as time went on the market became flooded by newer players in the market ,well in one sense, old names with new product lines ,Stanton, Newmark and Behringer. I am not too concerned with cost, my goal is to make the highest performance PSU I can, so I am looking for ways to improve this circuit, I have searched a lot on Google and the information is great, but I don't find many schematics beyond the simplest ones I find on Texas Instruments data sheets etc. You'll also see a random inductor preceding the rectifier bridge, I am thinking about including an AC line filter before the primaries of toroidal transformer (see below attachment).

Is it possible to strap inductors across the 4 filter caps? Is there an improvement in performance to be gained and is this even the way to do it? I've started reading about LC Pi filters. I am considering using the LM117 HV (or LM317HV) as regulator, but am keen to see where I can improve on this circuit, whether through zener reference diodes, or possibly a discrete design, (series pass transistor design?) I have put together a basic and preliminary schematic to start refining. I am learning as I go, and reading every available resource on power supply design.

The PSU is to power a clone of the Bozak CMA 2DL that I am building. My goal is to design a high performance, low noise and ripple, 40 VDC power supply capable of supplying 1.5a of current to the load. I am in the process of learning about linear regulated power supplies.

Pi filter audio power supply design