What are fuses used for?

After trying a few different brands of high end fuses on my McIntosh C2500 tube pre I have come to the conclusion that there are better ways to spend the money (like giving it to the homeless).  Either my system has such high resolution that they aren’t needed (doubtful), or it’s snake oil.  I go with snake oil.  

Thanks again!

Some fuse holders are square and require a push-in for release. Others are round and require a push-in with a twist before they can be pulled out.

Look on the back panel. Near the AC cord/outlet you will see a round (usually) screw-type cap. Below it will be a designation indicating the size of the fuse required. Unscrew the cap and pull it out. The fuse is held at one end by the cap. It is a press fit. Pull on the fuse to remove it. Hold the fuse up to a light and observe the very thin wire within. If it is intact the fuse is good. If the wire is broken the fuse needs replacement. Replace only with a fuse of the same rating on the back panel.

Thank you very much.

If you have the manuals for your equipment it shows you where to replace a fuse. If you don't have the manuals you can probably download them from the manufacturer. 

Where do you put the fuse????

“Contrary to popular misconception by the ill-informed fuses (like all wire) have NO effect upon sound quality. To think otherwise is to believe in magic!”

Here we go again.....hope this thread doesn’t turn into heated debate on the effectiveness of aftermarket vs. stock fuses. 

I almost forgot. Fuses are also used to torture naysayers. That’s the most fun feature of fuses as we have seen.  Fun for everyone! 

Fuses can be used to change or control the sound just like speaker cables, interconnects, capacitors, power cords or any wire or cable. Capacitors serve a function just like fuses. Yet capacitors are also directional due to the wire running through them. Since all wire is directional, including the teeny tiny fuse element, all cables, capacitors, fuses sound better in one direction vs the other direction. In one direction, that usually cannot be predicted by the user, the sound will be relatively more coherent, more natural and more musical than the other direction.

This proposition regarding directional can be illustrated most easily by reversing the direction of interconnects and evaluating which direction sounds better. Voila! I’m not referring to shielded interconnects, since they have their own independent issue regarding direction.

Contrary to popular misconception by the ill-informed fuses (like all wire) have NO effect upon sound quality. To think otherwise is to believe in magic!

All electronic devices/circuits require fuses at the inputs to the power supplies. The exception being battery (DC) powered devices where maximum current draw is limited by the battery size.

They are used to prevent damage to electric circuits from excess current. A fuse is a fine piece of wire with a selected melting point placed in series with one leg of the incoming AC voltage/current. If an electronic device draws too much current the fuse wire will melt and open. Preventing any AC voltage/current from entering the device. Thereby saving the device/circuit from further damage.