Hey folks. I just picked up a Vox 847 and decided to install a 9V jack in lieu of the battery-only option for the unit. What I thought was a simple job has now frustrated me. I wired negative to the tip and am using my DC Brick to power it. However, it appears to be "pulsing" through my amp as if an alternating current is still coming through it. I've used 9V battery jacks to hard wire my pedals before, but thought this might be a cleaner option. I also tried to power this with my OneSpot adapter, and althought I can get a clean sound through it, I can not get the pedal to activate. I am using a standard 5.5mm (OD)/2.1mm (ID) jack from Radio Shack, and the DC Brick using the same size cables according to their specs (plus it's a tight fit). Any suggestions as to what my two left thumbs have done? Thanks!!!