Replacing fuses, either the outer main AC, or the inner rail fuses is pretty straight forward. Just unplug the amp, use the right sized screwdriver (or tool) to avoid burring up the fasteners, and remove the top. Be sure you use the correct replacement fuse.
My McCormack amp DNA2 uses a "Slow Blow" outer fuse and will constantly blow standard fuses of the same amperage rating during turn-on. The "slow blow" fuses allow the initial rush of higher amperage to pass through the fuses with out blowing them. Replace the cover with the same care you removed it, and have a nice cool Bud. Cheers. Craig
My McCormack amp DNA2 uses a "Slow Blow" outer fuse and will constantly blow standard fuses of the same amperage rating during turn-on. The "slow blow" fuses allow the initial rush of higher amperage to pass through the fuses with out blowing them. Replace the cover with the same care you removed it, and have a nice cool Bud. Cheers. Craig