Hi Fi Tuning Supreme fuse-Burn In?

@geoffkait 
I know you from the Stereophile forums... This is Glotz. Good see you're fighting the good fight in here as well.

Do you know how to tell the proper orientation of the fuse holder is (to match the directionality of the HFT Supreme fuse indicator)? I have the insertable type into an IEC power cord housing

One thing not mentioned on fuses is the cheap 50 cents zinc
buzz fuse can vary up to over 15% . This is why for example I used a 1 amp Hifi tuning and synergistic fuse 
in a preamp and it popped 2x reason being ,the quality fuses are accurate to within 1-2%. By going up to a 1,25 amp solved the problem .
Mfg build in over 20 % rating into most all products.with boutique fuses go one size up ,with slow blow fuses they  are more resistant and slower
to blow on turn on .

I have a couple of questions about audiophile fuses that I wanted to ask the experts in this forum:

- Given the same fuse type and generation, does a higher Amperage fuse sound fuller and better than a lower Amperage fuse (eg replacing a 500mA fuse with a 2A fuse) ? I assume the higher rated fuse has a thicker filament and could actually result in a better response.

- Is there any way to accelerate the burn-in process? The 200-300 hour burn-in process for these fuses means that I put in 200-300 hours on the very expensive and hard to find tubes that I have in my equipment before I get good sound. And, to compound that, since I periodically upgrade my fuses gradually (ie one fuse at a time), this means that I will be putting in many hours on the tubes in my DAC, preamp, and amp before the fuses are burned-in. By then, the tubes have aged considerably, which is very concerning.

I have experienced in some cases on preamps that have high current analog circuits (such as Class A) or on HT processors with a ton of op amps that a larger amperage fuse will improve things. For example, replacing the standard 800 mA fuse on a Krell preamp with a 2 A fuse will have a good impact. The music just hits with more authority (such as snare drums, kick drums, impacts, etc.), and it is more open as well. It is like the 2A is letting the music breath. With the smaller 800mA, the sound was more constrained and closed in. You want to be careful with how you do this because the fuse is supposed to be there to protect the entire device if there is a short that occurs somewhere in the circuit. On a normal stereo preamp with only op amps, I probably would not go higher than a 1A.

For amplifiers, I don’t recommend bumping up the fuse much because with amplifiers, the 4A to 15A fuses already carry a good amount of current.

And sorry to say, there is no fast way to burn in a fuse.  You can always burn the fuse in on a separate piece of equipment.