[fixed] Hum in H&K Rotosphere on Input 4

[Merlin]

I have a Hughes and Kettner Rotosphere pedal that recently gives a very disturbing hum, I have it in via output / input 4 and have to use the gate to dampen the hum, but in such a way that my tone also stops quickly. (i use a clean rJC120 ampsim so that one does not gice the hum)
When I put it in front (guitar - Rotosphere - Axe) everything is super quiet, does anyone have any idea how that could be? I allready tryed different cables without result.

 

[FractalAudio]

Ground loop. Use a Humbuster cable or break the loop.

 

[Merlin]

Thank you for the quick reply, I used the Humbuster cables which i bought at G66 without result. Still have the hum.

Also tryed the Behringer HD Hum Destroyer without result.

 

[yek]

Power the Rotosphere with the same power strip as the Axe-Fx, but make sure that the Rotosphere is not grounded (use a two spong plug with the Rotosphere).

 

[Merlin]

I will give that a try, thank you very much both.

 

[Merlin]

Power the Rotosphere with the same power strip as the Axe-Fx, but make sure that the Rotosphere is not grounded (use a two spong plug with the Rotosphere).

Thank you Yek this helpt a lot.