Intentionally ordered a 6.3A purple fuse for my 5A Rogue Atlas Magnum II. Sounds great and the Rogue hasn’t blown up...I will certainly let this forum know if there’s a problem.

@cakyol and @jasonbourne52   I've used SR Black and Blue fuses in two amps for about 7 years without blowing them (until a tube went and the amp had a bad cap/replaced).  I put an SR blue fuse in my EAR 864-immensely superior sound on CDs, LPs, R2R and cassettes (Nakamichi 7A).   NO PROBLEMS.  The cheap ass glass fuses are NOT made for audiophile purposes and diminish sound quality in no uncertain terms.  In a low end system you probably will not notice a difference.  In my high end system and even my lesser system, they make a HUGE sonic improvement.  The glass fuse permitted some recordings to sound good while diminishing the quality of others.  The SR fuses made ALL recordings sound better.  

My electronic and cable manufacturing friend uses circuit breakers instead of fuses after he heard my system.  He hates tweaks but acknowledges the superiority of audiophile protection circuit parts (breakers and audiophile fuses).   He also uses $25 fuses in his DAC and transport.  

Fuse standards are not UL. Safety standards are set forth by the N.E.C. in the US and I.E.C. for global standards. 

jerryg123

Fuse standards are not UL. Safety standards are set forth by the N.E.C. in the US ...

You are mistaken - UL most certainly sets standards and issues certifications for fuses. Some info specifically referring to fuses and fuseholders is here on its website:

" ... We can simultaneously provide Global Market Access solutions for the UL Mark in North America, as well as other certifications for markets around the world ... "

OK, so I finally (hesitatingly) just recently jumped on the audiophile fuse bandwagon. It’s my first time, even though I’ve been reading about them for years now. I just purchased two HiFi Tuning Silverstar series fuses, but have yet to install them. I realize the models I purchased are not the most expensive on the market, but it’s a first step.

What doesn’t sit well with me regarding these audiophile fuse ratings is the fact that some audiophiles, due to some audiophile fuses prematurely or mistakenly opening up (popping or blowing - whatever word you want to use) in equipment (from what I’ve read in this thread and on other message boards), may need to increase replacement fuse amperage ratings when replacing them.

IMO there shouldn’t be two different amperage ratings standards - one for standard non-audiophile fuses, and one for audiophile fuses. If my HiFi Tuning fuses blow on me, they will not be replaced with higher amperage rated audiophile fuses. It’ll simply be lesson learned.

I get the feeling that some of these audiophile fuse makers haven’t been in the business of making fuses long enough to have figured it out, or maybe haven’t done their due diligence research (as well known companies like Bussmann or Littelfuse have done), if they’re simply recommending increasing amperage ratings (other than what is spec’d by the equipment manufacturer) when replacing blown audiophile fuses.