I'm trying to replace a blown fuse from my stereo system. The fuse has the following markings on one end: 125V 5A and the following on the other: 51MS, an H with a circle around it (I'm assuming this means Hitachi), and some other symbols including the Underwriter Lab logo, an "SA" logo and an inverted triangle with a "T" inside (drawing below) and a line just above the T. It's 5mm x 20mm
The fuse has a wire, then a small blob of metal, then another wire (which, to my untrained eye seems a bit thicker).
I think this is an M Spot Fuse, as described by @Harry Weston in this answer: Slow Blow vs Fast Acting Fuse
As far as I can tell, this is a Hitachi FN00373. Unfortunately this is a really rare fuse. I should also mention this stereo system is about 10-15 years old.
Is it possible/advisable to use a different fuse in its place (I'm not sure I can even get the Hitachi fuse anymore). Or, is it possible/advisable to use a slightly different fuse (e.g. one that isn't "M Spot" or has a slightly different voltage/current rating)? If you can recommend one, that would be ideal!