High pitched hum???

[bassist_lewis]

I'm getting a very high pitched hum (like 15k+) from my pedalboard. I have two loops. Loop 1: octave and overdrive. Loop 2: Moog Low pass filter. I've narrowed it down to the Moog, it's centre positive (opposite to everything else) so the plug (part of a daisy chain powered by a 1spot) has an adaptor to reverse the polarity. When I unplug the Moog the hum goes away, problem solved but i want to keep using the Moog! Is there a way to get rid of the hum? would a better quality adaptor make a difference?

Lewis

[dannybuoy]

Separate power supply for the Moog, or invest in a supply with isolated outputs!