Have you tried with the ground lifts on the back?
Edit: what kind of noise?
Ground lift doesn't help.
The noise is typical single coil humming, but more than it should be. In germany I don't have this problem. So far I learned that too many grounds can cause a problem like this. Now I have to find out if I have grounded outlets att all. I will buy a ground fault tester and check all the outlets. That's an investion I should do anyway, because it can save my life here in Thailand. Than I will try to disconnect everything and try only the KPA with headphones. My guitar is grounded, the cables are good. Hopefully I can get rid of the noise.