Hi Benjamin,
Thank you for the hints!
As you can imagine I played arround with the geometry and the rotation adjustment trimmers. That didn't help.
I measured the supply voltages, at the X amp which seems to be very stable. I measured also the voltages at the starting points of the staircase lines shown in one picture and the end points. All starting point voltages and respectively all end point voltages are the same. The voltages are measures at the inputs, in the middle and at the output stage of the X amp.
Regards
Loetroelli
