Hi @Berry_B is the the correct current doubler that you used? https://www.gak.co.uk/en/voodoo-labs-pedal-power-cable-21mm-barrel-current-doubler-plug-output-10cm/100985?gclid=CjwKCAjw3azoBRAXEiwA-_64OqLrTDJLbE1c6DNGJoJv7uC531nFzH2c5FIPrsavIcREvdSvuJB2-xoCotAQAvD_BwE&gclsrc=aw.ds