Kedoades, you will probably find it on the back of your preamp. It frequently is part of the IEC chassis mount where the power cord plug into. If so, you will need to remove the power cord out.
If it is not there, try inside by removing the top cover. You may just see fuses in fuse clips or it may be in a black box that is a little wider and longer than a fuse, which you open with a small screw driver that fits into the square hole in the cover at one end.
You will need to know the amp value for the fuse, which is in print on one end. You will also need to note whether it is "slow" blow or " fast blow' and how long it is in millimeters. The short ones are 20 mm and the large one 32plud mm. You will need to remove the existing fuse and insert the new one. You beed to be careful doing so. Then there is direction. All I can say is that direction matters The manufacturer may tell you or alternatively say you are crazy to ask. Your best course is to insert the fuse one way and listen and then reverse its direction and listen again. Leave it where it sounds best.
If it is not there, try inside by removing the top cover. You may just see fuses in fuse clips or it may be in a black box that is a little wider and longer than a fuse, which you open with a small screw driver that fits into the square hole in the cover at one end.
You will need to know the amp value for the fuse, which is in print on one end. You will also need to note whether it is "slow" blow or " fast blow' and how long it is in millimeters. The short ones are 20 mm and the large one 32plud mm. You will need to remove the existing fuse and insert the new one. You beed to be careful doing so. Then there is direction. All I can say is that direction matters The manufacturer may tell you or alternatively say you are crazy to ask. Your best course is to insert the fuse one way and listen and then reverse its direction and listen again. Leave it where it sounds best.