Firstly you should stick with the voltage stabiliser and not worry about a variac as I suggested, the voltage stabiliser will do what you are after given it is rated down to 187V, even if the input falls to 184V then this will not make a significant difference to the output for B&W work.
Originally Posted by foto-r3
There are generally two types of fuses fast or slow (there is no 'normal' , but because fast blow are more common they could be considered 'normal' !). Don't assume that the fuse which came with the unit is correctly rated. As Michael suggests, get a copy of the manual, by going to the link he found and requesting it. That will tell you straight away the correct rating and type of fuse you need.
A fast blow fuse has a straight filament of wire in it, whereas a slow blow fuse will have the wire coiled at some or all of its length http://www.microfuse.co.kr/4fuse%20g...%20guide06.htm (this site names the fuses normal, medium slow-blow and time-lag. Normal is 'fast blow' and the 2nd two are slow blow)
here's a close up piccy of a slow blow fuse http://www.marcucci.it/prodotti/imm_comp/3004646.JPG
If the fuse case is glass then you will be able to see this for yourself.