My construction. Pictures don’t show the last touches but these are details.
Box is taken from old tuner Myryad Z130.
Power and led managed by bistabile electronic switch.
2 laptop PSUs, LCLCL filter with various capacitances and types, noise at the end is reduded to a couple uV.
Schematics slightly tuned.
PCB is completely redesigned, audio connections far from supply, separate masses for each section joined in 1 point, short paths. 2nd layer of PCB is just a screen, connected in 1 point so not transferring any currents. Everything surrounded by extra mass path (next screen).
Lots of steel for extra shielding. Radiators on opamps. Grounding without any loops. PCB painted with epoxy base and metallic spray
Steel, steel and more steel
Carefuly selected parts etc.
No noise or hum at any volume level.
It plays with Sony PS-X65 and AT VM95ML. The sounds is warm, though dynamic and detailed.
I planned it but being satisfied with the result I didn't try tantal capacitors in supplying opamps, any experience?
Cheers