Synergistic Research Black fuese

I'm thinking about trying these in my monos but reading there were a couple of occasions of them blowing is slightly disconcerting...the manufacturer state to use sand filled T6.3A so would it be a straight swap or a different rating considering the sensitivity of the Black...??

I moved up to the 8A and had no further problems with the fuse blowing. Highly recommended due to the improved sound quality which iis a significant step up!

I just installed 2 black fuses in a nice
Tube intergraded amp.    I had to
Move my speakers out from the wall
And closer to gather.   Still great bass
Deep sound stage.   Dog
Out side of speakers music is there.  
One of a few Tweaks you can actually
Hear.    

Assuming these fuses do make a difference, I want to understand, why? Whats the technical explanation of what is happening?

Assuming these fuses do make a difference, I want to understand, why? Whats the technical explanation of what is happening? 

Think it's a faith based approach . That's all that matters .