I have Aragon 8002. I have a problem because I have no fuse. What fuse is used at 220V? Thanks, John

Have you the remains of the fuse, or was it just not in place when you got it?
The reason I ask is that the amp's fuse doesn't have much to do with the voltage of the mains supply (in your case a 250V fuse will cover it). It goes on the load in Amps or Milli-amps. Shown as A or MA. If you have the old fuse you might be able to see it on the case of the fuse. It might say 1.5A or 500ma etc. Also there are two main types of fuse, known as fast and slow blow fuses. Again if you have the old fuse the remains of a coil inside will mean it's a slow type. The other type is just a wire. However you can fit a fast blow for a slow one. If the fuse blows again it will be a fault that causes it.
If you have no fuse left at all you will either need to find someone who has the same amp and to tell you what it is, or the circuit diagram for the amp. Sometimes it's even printed on the PC board!