Synergistic Research Black fuese

I can logically explain  the reason why better fuses sound better .
With yhd Blacks they use the nano Graphite coating which I have followed for 
Over 2 years now Nasal Developed and used in the best 3d printers, super conductor capacitOrson, Nasa Wiring . Synergistic uses it a as a coating .
It is many 1,000s denser molecular  wise.
Let me back up a moment , if you go online and look up metals resistance
Index ,Silver ,vs the cheap buss fuse is 7x less resistance Copper very similar to Silver in this respect. The steel fuse is loads of low level nois and a Huge bottleneck ,like a 1/8 the inch pipe  vs a 7/8th inch pipe Carrying  water.
Electrically resistance wise a similar effect friction resistance= noise
In simplistic terms. These new Black fuses x100 .diminishing returns 
But no matter what fuse.myself had Hifi tuning Black supreme fuses no contest 
The best fuse I have ever used in my Schiit Multibit Gungnir dac ,Aurender player 
Like a upgrade more detail more realistic analog if you will .
In my Pass 1st watt same thing,even my 300b preamp like a upgrade .
Well worth the $$ .parts connecxion will give you $$ off thd more uou buy 
I bought 6 and saved $100 during Xmas sale even at 150 hours still better better.
The nano coating takes 200 hours to fully settle in.

Regarding bigger fuses please remember a steel standard Buzz fuse can vary over 15%.this is why the Very accurate Black fuse or boutique fuse may have popped they are within 1% typically.  With these fuses Allways go one size up. 
From a 2smp slow yo a 2.5 amp is fine  the majority of electronics are built with at least A 20% on average over head  for voltages in towns  can vary .

I'm in the UK, and I'm going to order some of the new SR Blue Fuses, I need 315mA for my Nagra CDP, PSU - ACPS-II 230V, but some say use a slightly larger fuse like your previous posts.

The next fuse up is the 500mA, would it be okay to use the 500mA instead of the 315mA on my Nagra CDP, my CDP is plugged iny my Isotek Nova that as the RCD trip switch protection.

I got 6 blue ones they are even better keeping the blacks as a spare and they do live up to the hype.But what about bees wax??

I am currently using the SR Blue,  They are an improvement over the blacks.  The best fuse  I have tried are the Audio Magic Bees wax fuses.  I have had such a high failure rate with them  that I stopped using them and  am hesitant to buy any more.  Now Audio Magic has a "Super  Fuse"  costing $250,00 apiece.  Too rich for my blood..  Anyone out there has tried these $250.00 fuses?