Here are some indexes of MODS:
This is a temporary solution to help find important post.
Video instructions to help open the top cover 1524
XS4400 Transformer mod 160
Link to manufacture 630
Circuit board explanation for transformers by Ted 1133
Document transformer mod install 1141
XS4400 Transformer layout 1749
Transformer comparison to pro gear 1662
Recommended de-solder for DYI transformer mod 1664
Not to use both XLR and RCA by Ted 1180
Transformer burn in recommendation by Ted 1592
Internal Analog power connector part number 195
Power wire twist 1503
First external power mod 312
Power supplies used 1722 & 1870
First internal power mod 434
Ted Smith linear power supply notes 497
Ted Smith on power up sequence 749
Internal power supply noise 1827
Block EMI / RF with stilpoints 830 & 1481
3M Sheet that seems to cover the emissions range 1647
Shielding photos 1713
DYI screen shield 1980
From Ted a few years ago regarding EMI absorption inside the DS 937
Teds original prototype 1106
Vented cover mod 1233 & 1377
First talk about The Power Supply Controller Board 1683 & 1760
Introduction to The External Power Supply Controller Board 1852
External Power Supply Controller Board Description of operation 1974
2-pin power connector used in the Power Supply Controller Board 1886
Install instructions for the External Power Supply Controller Board 1898
First photos of installed boards 1969
Photo of finished power supply board 2055, 2071 & 2090
Feel free to ad to this list. I can add it here from post to keep indexes in one place.