If the wires are sodered on to yhe ends of the fuse you can carefully cut them right at the fuse but i would hold my sodering tip on the weld and pull the wire off when the solder melts. Unfortunatly you would have to solder a new fuse back in being realy,really carefull about how long u leave the heat on as it could cook the fuse Sounds like a job for a repairman as you dont want to be frying anything else or altering a good amp and if they screw it up they have to take care of it. please let me know how it goes,im curious.

Http://www.thetubestore.com/lib/thetubestore/schematics/Peavey/Peavey-Windsor-Schematic.pdf
https://assets.peavey.com/literature/manuals/Windsor.pdf