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What are fuses used for?

I have, I’m sure to many, a very dumb question. I keep reading about fuses.  I have a fairly sophisticated system and have never come across the need for a fuse.
Can someone tell me where these fuses go and what they’re used for?
128x128rvpiano
rvpiano's avatar
rvpiano OP
2,664 posts
 
Thank you very much.
roberjerman
4,319 posts
 
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.
roberjerman
4,319 posts
 
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.
rvpiano's avatar
rvpiano OP
2,664 posts
 
Thanks again!
stereo5's avatar
stereo5
6,404 posts
 
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.  
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