It seems that other things could burn up if a higher amperage fuse is in place.Yes it will destroy your amp if something is pulling too much current
I am compelled to simply stick to the mfg specs for something that I don’t understand because I don’t want to create problems just from a simple tweak.Just a good quality $2 Bussman or Little fuse of the same rating as the manufacturer suggest, and it will sound just as good as any BS "snake oil"fuse
Should I let them ship me a 6.3A or just be done with this?Not on your life, demand a refund asap.
Cheers George