When I got my my modded Hafler DH-220, they had cryo-treated, ceramic audiophile fuses. I melted them pushing Maggie MMGs at moderate volume playing mostly jazz music. Go figure.
I replaced them with standard glass fuses because it's what I had on hand, and they worked fine (same amp rating).
Then I read about standard ceramic fuses offering a slight increase in SQ, so I swapped out for them.
I DID notice a slight improvement in SQ, and stopped there. Ceramics are fine with me.
ALL of my research - which was considerable - had electricians and electrical engineers suggesting that using fuses with SMALL increases in suggested amp ratings posed little problem, and wasn't worth dithering over.
Would you want to replace a 6.3A with a 15A? Or even a 10A?Probably not.But an 8A shouldn't present a problem if your original fuse was 6.3.I would hazard an educated guess that that little 8A fuse will blow long before you run the risk of ...................burning down the house.
I agree with almarg and auxinput.