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?
Those that say otherwise raise their hands:
Take another look at my posts on this topic. In all of them you will see that I confirm that what is being claimed as heard could be real and that it can backed up by measurement. The thing that seems to be tripping y’all up is that the measurement confirms what you hear and at the same time shows that the phenomena is **not** due to a fuse being directional but instead just simply the resistance across the fuse is different.
BTW, from the HiFi Tuning website, we find a PDF document with fun facts about these fuses:
http://www.partsconnexion.com/prod_pdf/hft_facts.pdf
Note that they list different resistances depending on direction. But also note that the resistance is stated in ’mOhms’. Its unclear what the small ’m’ is for, but if that is ’milli’Ohms then their measurements are a mile off.
On the HiFi Tuning fuses we have here, they measure about the same as the leads of the meter do shorted together, about 0.1 ohm. In milli-ohms that would be 100 milli-ohms (but we know that the probes are that much already, so the fuse is much less), so my guess is that by the ’m’ they are probably trying to say ’micro’ (which is normally expressed with a ’u’ which is as close as a keyboard can get to the Greek symbol Mu).
I’m not sure how you would measure that accurately, but one thing is certain and that is the meter and probes used for the test plus minor resistances across the contact of the device itself are likely responsible for any differences seen. Heck, if you simply took the same measurement twice with a meter with that resolution (which is a very expensive meter) you would likely find larger differences without reversing the direction!
So I think we can see that the idea of the manufacturer’s PDF as suggesting directionality is completely false. A better interpretation is that the *average* resistance of the fuse is going to be in that ballpark. I think they have done a mis-service as these numbers, when so obviously misinterpreted, spark a lot of useless debate.
Now I’ve already shown why there is directionality and that its not something within the fuse. This is confirmed by the numbers I’m seeing on the HiFi Tuning PDF- the latter are far too small to play an influence in the voltage drops I’ve measured!
So again: reversing the fuse can be audible, even though the fuse itself is not directional. So the people that hear this and find it repeatable are probably hearing it (unless they are experiencing expectation bias) and those that don’t may not be hearing it (unless they are experiencing expectation bias).
Those that say otherwise raise their hands:
Take another look at my posts on this topic. In all of them you will see that I confirm that what is being claimed as heard could be real and that it can backed up by measurement. The thing that seems to be tripping y’all up is that the measurement confirms what you hear and at the same time shows that the phenomena is **not** due to a fuse being directional but instead just simply the resistance across the fuse is different.
BTW, from the HiFi Tuning website, we find a PDF document with fun facts about these fuses:
http://www.partsconnexion.com/prod_pdf/hft_facts.pdf
Note that they list different resistances depending on direction. But also note that the resistance is stated in ’mOhms’. Its unclear what the small ’m’ is for, but if that is ’milli’Ohms then their measurements are a mile off.
On the HiFi Tuning fuses we have here, they measure about the same as the leads of the meter do shorted together, about 0.1 ohm. In milli-ohms that would be 100 milli-ohms (but we know that the probes are that much already, so the fuse is much less), so my guess is that by the ’m’ they are probably trying to say ’micro’ (which is normally expressed with a ’u’ which is as close as a keyboard can get to the Greek symbol Mu).
I’m not sure how you would measure that accurately, but one thing is certain and that is the meter and probes used for the test plus minor resistances across the contact of the device itself are likely responsible for any differences seen. Heck, if you simply took the same measurement twice with a meter with that resolution (which is a very expensive meter) you would likely find larger differences without reversing the direction!
So I think we can see that the idea of the manufacturer’s PDF as suggesting directionality is completely false. A better interpretation is that the *average* resistance of the fuse is going to be in that ballpark. I think they have done a mis-service as these numbers, when so obviously misinterpreted, spark a lot of useless debate.
Now I’ve already shown why there is directionality and that its not something within the fuse. This is confirmed by the numbers I’m seeing on the HiFi Tuning PDF- the latter are far too small to play an influence in the voltage drops I’ve measured!
So again: reversing the fuse can be audible, even though the fuse itself is not directional. So the people that hear this and find it repeatable are probably hearing it (unless they are experiencing expectation bias) and those that don’t may not be hearing it (unless they are experiencing expectation bias).
