A 0.5 amp, 250 volt fuse is the same as a 1 amp, 125 volt fuse. http://www.radioshack.com/product/index ... d=2102746#
No! Bad advice! Fuses are designed to open when the current rating is exceeded, so a 1 amp fuse gets replaced with a 1 amp fuse, always. Oh, you won't hurt anything putting a 0.5 amp fuse in, but that means it might blow when it's working normally, which you don't want.
The voltage rating of the fuse is the maximum working voltage the fuse can have across it if it does blow. This is to ensure the fuse does not arc over if it blows. It is perfectly acceptable to replace a 1 amp, 125 volt fuse with a 1 amp, 250 volt fuse, provided the working voltage does not exceed 250 volts. Putting a fuse with a higher current rating in is NOT acceptable though.
To the OP, the slow-blow type fuse is important. The surge when the unit is first turned on might be enough to momentarily exceed the fuse rating, so a slow-blow is designed to withstand this. If you put a normal (fast blow) fuse in, it might very well blow even if nothing is wrong. So, to answer your question, it is fine to put 250 volt, 1 amp, slow-blow fuse in.