From the pictures online it looks like a 3AG fuse holder. The cap unscrews and the fuse is held in a cup on the cap. The 3AG fuses are 1/4" diameter x 1 1/4" long. Which are just about the universal glass fuses used.
Usually they manufacture will mark ampere rating by the holders. If not check the manual. Or
Remove the old fuses and look around the silver ends of the fuse. Usually engraved is 3AG, 250V and some number with an A after it. This is the amp rating of the fuse.
However! Power input fuses may be a "slow blow" type to handle turn-on Inrush current. You can tell a slo blo fuse by the extra stuff inside the fuse. The standard fuse just has a wire running across. Your amplifier may have been supplied with like an 8amp slo blo input fuse. Someone replace it with a standard 8 amp and it blows frequently upon turn-on. If not immediately. So they upped the rating of the fuse. Wrong way to go.
Search ebay for 3AG fuses.
FYI Also available are Fast Blow fuses. Those fuses have a white ceramic cover instead of glass.
Usually they manufacture will mark ampere rating by the holders. If not check the manual. Or
Remove the old fuses and look around the silver ends of the fuse. Usually engraved is 3AG, 250V and some number with an A after it. This is the amp rating of the fuse.
However! Power input fuses may be a "slow blow" type to handle turn-on Inrush current. You can tell a slo blo fuse by the extra stuff inside the fuse. The standard fuse just has a wire running across. Your amplifier may have been supplied with like an 8amp slo blo input fuse. Someone replace it with a standard 8 amp and it blows frequently upon turn-on. If not immediately. So they upped the rating of the fuse. Wrong way to go.
Search ebay for 3AG fuses.
FYI Also available are Fast Blow fuses. Those fuses have a white ceramic cover instead of glass.