Fuses fuses fuses

Thanks, Ralph (Atmasphere).

I’ve been assuming that the "m" in the HFT paper stands for "milli." If in fact it stands for "micro" then the 0.000038 ohm figure that has been cited to illustrate how miniscule the differences are in their measurements for the two directions would actually be 0.000000038 ohms!

Although I’m thinking that "milli" may actually be the correct interpretation. For example this Littelfuse datasheet lists for their 3AG Series 313 glass-bodied 6.3 x 32 mm slow blow 2 amp 250 volt fuse a "cold" resistance of 116.9 milliohms. Which is very close to the numbers shown in the HFT paper for a T 2 amp 6.3 x 32 mm "standard glass fuse" if "m" is interpreted as milli and the commas in their numbers are interpreted as decimal points.

Fuses having significantly higher current ratings have much lower resistances, of course, with the resistance of the 10 amp Littelfuse in that datasheet indicated as 8.3 milliohms, which seems consistent with HFT’s measurements of their own fuses having relatively high current ratings. (Their paper doesn’t provide measurements of standard glass fuses rated above 3.15 amps).

Either way, though, I of course agree with everything else in your post, and it is consistent with and further emphasizes what I, some other members, and others who like yourself are designers of highly respected audio electronics have said here in various fuse-related threads.

Best regards,
-- Al

tubegroover
Yeah I read it Ralph and am mystified why Geoff didn’t acknowledge it in his explanation which completely avoided it. It is a truism in audio that MANY things can affect sound, often in quite subtle ways, some more profound, of that i’m a witness . Unfortunately it is often taken as a monetary opportunity for some that make their livelihood by exploiting for profit, sometimes substantial, the differences. Geoff wouldn’t you agree that Audioquest has a vested interested in promoting "truthful hyperbole"? It’s all about marketing savvy and understanding the customer. Hundred dollar fuses, really?😂

That’s got to be the dumbest thing anyone said so far. What possible financial motive would Audioquest have in promoting cable and wire directionality? Heck, most audiophiles are like you and don’t believe it anyway, and wouldn’t buy it because you think it’s a scam. But to further destroy your silly argument Audioquest is by no means the only cable manufacturer selling directional cables. In fact any cable manufacturer that wants to compete for audiophile dollars must certainly be aware of directionality and actually mark their cables accordingly. Anti Cables obviously, Goertz, and I’m sure many others. Not only that almost all high end cable manufacturers cryogenically treat their cables. Why? To be able to compete. So what have we learned here. It’s performance that drives the market of cables not hyperbole. Duh!

On the data sheets they use m for milli, as in when they write m Amp. One assumes the commas are just the convention in Germany. You know, HiFi Tuning is German.

Now, correct me if I’m wrong but in the interpretation of measurements section on the HiFi Tuning data sheets that I posted the other day the statement is made that the differences in resistance between one direction and another of fuses is generally around 5%. I’m not seeing that; what I’m actually seeing is almost an order of magnitude less than 5%. Agree/disagree? Talk amongst yourselves. Smoke if ya got em.

Geoff, regarding your question just above, in one of my posts here yesterday I had quoted the following statement I made in an earlier fuse-related discussion:

... all or nearly all of the directional differences in resistance were vastly smaller than 5%, with the exception of the "standard glass fuse."

However, note that what the paper says is "the difference is in the range of 5%," not "generally around 5%."   Differences that are "vastly smaller than 5%" are WITHin the range of 5%. So their statement is arguably accurate, although highly misleading.

Regards,
-- Al
 

atmasphere
Not to make too fine a point of it, but has anyone here noticed that I have confirmed by measurement that if you place the fuse in backwards that you may indeed hear a difference?

>>>Let me help you out. What we are actually saying is that not only is there a difference between one way and the other but that it’s PREDICTABLE which way will sound better than the other - when you control the manufacturing process. There is no backwards or forwards! Didn’t you read the Audioquest paper? That’s why we say fuses are directional. That’s why we say ALL WIRE is directional. It’s because of the wire manufacturing process that the wire becomes "directional." So, it’s not just that it SOUNDS DIFFERENT, it SOUNDS BETTER one way than the other. and it's predictable if you control the process. That’s the whole point. We don’t even have to get into the atomic physics of why that’s true. Does that help?

Now, cable manufacturers who mark their cables with arrows obviously control the manufacturing process. Not so sure fuse manufacturers control the process of fuse manufacture, which is not really a problem since the user can simply try any fuse both ways and pick the direction that sounds best. And for cables and interconnects that aren’t marked with arrows then obviously the user should try both directions and see which one is best.