i have a Spider IIHD 150. the fuse on my amp was blown before while i was letting a friend borrow it years ago, and he had it repaired by a certified Line6 technician.
recently my head started cutting out, popping and such. when i checked the fuse i noticed that it was a 5a125v, even though the fuse holder AND the writing underneath the power input say to use a 4a250v fuse. so i looked at the stock fuse that had blown years ago(yes, i kept the old blown parts!) and it was also a 5a125v.
i'm wanting to replace the fuse to see if it has anything to do with the cutting out, but i'm not sure to go with a 5a125v or a 4a250v.