It’s enough simple, remove rectifiers and filter (R11, R12, R13, R14, R15, C8, C9, C10, C11, C14, C15, D6, D7, D8, D9).
Then you can connect the different raw supply to the pads of C14 or C15 (upper pad is the positive one).
Thx. I did that…tried to measure the voltage before connecting it to the Drixo, slipped with the probe, got a little spark…and now we have always 26.5V…so no regulation basically…any advise on which parts to exchange (with part numbers ?)?