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Blow a fuse?

Alright, so soon my and my buddies will be jamming out, and recording a little bit of it (more jamming than recording) and I'm bringing over my audio equipment, plus all of our amps. We will be in a rather small room (size of a bedroom roughly, maybe smaller. As the room is at my buddies house so I do not have dimentions) and have a bit of equipment:

weird fuse problem

this question is for people with some electrical knowldge. I have a Marshall JCM800, and the fuse broke down, so I bouth a pack of 3 fuses, each is 1amp, like the Marshall requires. I replaced the bad fuse, and the new one broke down five minutes later, playing at mid level, when I replaced it, i broke again, and again... I need help, why is this happening?