fuse ?

Need to replace the fuse in the AC adapter for a friends external computer
speakers, and can't make out the rating of the one in there. *I* think it
looks like a 1A fast blow, but the adapter is rated at 1A. Bought some 2A
fast blow fuses to put in it, just on a hunch, cause I can't remember the
formula for calculating fuses for power supplies. Anybody else know? Would
2A fb be a *bad* choice for a 1A power supply?

Thanks,

Dave

 

Ended up putting a 5A fb in it, 'cause I *think* that's what the one that
came out says it was. Any input from anybody is welcome.

Thanks,

Dave