Amplifier Question (About Fuses)

I have a 4 channel amplifier with 2 speakers (the whole set is pretty old, my dad has had it for a good 10 years).

Basically, on the back of the amplifier there’s a little screw cap thing where a fuse is supposed to go, it’s missing becuase I took it out years ago for some reason.

I think it needs a 1 amp fuse, on the back it says ‘Mains 1A’ or something.

What would happen if I put a 1.5 amp fuse in it? Would it still work fine? I can’t find any 1 amp ones… It uses those glass ones.