Hi i use a peavey

Question

Hi i use a peavey 6505 Amp head and when i run a seymour duncan pickup booster through the effects loop it blows the amp (possibly the pre-amp fuses) i want to get a volume boost in a distorted setting hence using this pedal, when i run it through the front it doesnt increase the volume in this mode, only in a clean mode. any suggestions what i can do to stop the head blowing ???RegardsAlan