You just couldnât help yourself, could you?
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Interesting. Did you try reversing the fuse direction. Proponents say that also makes a difference.
Iâm not in that camp but would consider removing the fuse completely and use a copper IEC inlet.
No, I didnât. I put it in as instructed: the side of the fuse with the S where the fuse clamp is in contact with the live pin of the power cable.
Science is science and I know a lot of it ! No need to try miraculous fuses or reversing the fuse, it is completely nonsense⊠You can see that about the directionnality of fuses !!! The power is alternative current, so the current is half time in one direction and half time in the other ! But I am sure you can ear difference between the two directions. If you really want !
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Dunning kruger effect at its best 
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âIgnorance in physical lawsâ effectâŠ
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We can go on like this until weâre blue in the face, or maybe you can actually try for yourself, instead of believing something is absolutely impossible because of, well, science. I used to be in that camp, but now that I have heard differences through several tweaks, Iâm not so resolute anymore. Not because I wanted to hear differences, on the contrary, I wish I hadnât heard some of them. It would have been cheaper and sometimes also less disappointing. And if youâre not open to try and experience something you deem impossible, thatâs cool too. I donât give a fuse As long as we can all enjoy our hobby and system the way we like.
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Nothing personal, of course, but with your âblind testâ setup youâve described Clever Hans to a tee.
Itâs always nice to be compared to a horse, especially one with my name. You might have had a point, had you been there to see the test with your own eyes, instead of (again) assuming to know how things went down. But you werenât there. Unless you are âInvisible Borisâ.
Letâs just agree to disagree. 
I said, nothing personal 
We could believe that a directional 
fuse plugged in AC line before a power supply that rectifies and regulates its output has effect thatâs clearly audible. Thatâs not just Nobel prize material. That would be the greatest discovery in physics since Archimedesâ bathtub fell out of an apple tree and hit Newton on the head. Seriously. And to think that a device that demonstrates a slew of heretofore unknown phenomena while disproving a number of laws of physics is available everywhere for pretty low price!
We could believe that. Or, we could just read your experiment description, see the number of rather glaring shortcomings in the setup, and conclude that nope, our understanding of the world had not been turned upside down. Just another test of subconscious biases.
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No worries Boris, I didnât take anything personal. Itâs just a fun discussion that will never end if weâre not careful.
I get all the science and I donât get why a fuse or whatever unlikely tweak might make a difference, when science says âNOâ. I told you, I was in your camp - I still am for the main part - but I do believe that some tweaks can make a difference, whether itâs illusion, self-delusion, or something science one day will have an answer to (stranger things have been discovered). I donât know. I also donât really care, because when it makes me enjoy my system even more, itâs worth it to me and to many other audiophiles alike, who enjoy their fancy cables, fuses, LAN isolators, fog lifters, ground boxes, vibratrons, hftâs (I know), acoustic dots, sound pebbles (grin), frozen cdâs (really?), etc, etc. I drew the line at fancy cables and a fuse (which blew me away). And I once tried an isolator, which didnâ't do anything at all. I try to keep an open mind and try some stuff every now and then, just for fun. Nothing wrong with that, I hope.
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Well, I think there we have it. This The Science 
does agree with â if youâve subconsciously hoped for there to be some difference, there will be a vast perceived difference. Science has no problem there, just like it also says that the time it take to turn Rose off, replace the fuse, and boot it back on, is longer than human auditory memory, so by the time the switch is done, you donât really remember what the previous incarnation sounded like. This is all the stuff that has been studied, measured, and documented.
In the end, if it makes you happy, itâs fine, and 200 Euros isnât so terrible, but it is also a purely subjective result. Objectively there is no difference.
My main objection here isnât really people spending their money whichever way they see fit, itâs supporting people peddling directional cables (and, yes, fuses) âŠ
I know auditory memory is short, but when you learn how to actively listen to music and make notes while you listen, you can actually hear and pinpoint differences in small things like the distortion of a tine in a Fender Rhodes, the reverb tail of a cymbal, a damper lightly touching a piano wire, the hight of an instrument, itâs place in the stereo image, the blackness of the background, how much a voice is pushed to the back when a guitar is played at the same time (or not), well you get the idea. Small details that can have an impact on how one perceives the music coming from the speakers. Thatâs how I listen to different amplifiers, speakers, dacs, streamers, cables, etc. If I would just listen more or less casually, the differences would have be rather obvious (like with different speakers) for me to spot.
Most of the time I just enjoy the music though and if you were to change my interlinks or powercable without me knowing, Iâm sure it would take me a while before Iâd notice
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Well, yes, just like youâve described. If you try really hard, you can hear any kind of differences, regardless of whether they are there or not.
Psychology of perception is a science, too, just like electronics
Well, thatâs not what I said, but that does not seem to matter, so letâs just leave it.
Thanks for your insights, next time I wonât buy a new amplifier. Iâll just image one.
It might even work for you. Although unlike fuses, amplifiers actually do something.
PS yes, this is a pointless discussion since âI know memory is short BUT MY golden ears will hear differences in a test that is neither random nor blindâ isnât something that can be argued factually.
Not any kind of personal attack, but there are ways of doing those tests properly, and there are well known, measured and documented capabilities of hearing. You can ignore them s long as it makes you happy with your system, it is perfectly fine, just not transferable to anyone elseâs listening experience.
Hi Hans,
Which size fuse do I need for the RS250A? The 5x20 mm or the 6.3 x 32 mm?
Looking forward to try it and see if I notice an improvement in sound quality.
(Je mag me trouwens gewoon in het Nederlands antwoorden ).
Groet,
Hendry
Ha Hendry,
De 5x20. Als je de stekker eruit haalt zitten de zekeringen (Ă©Ă©n reserve) in een soort laatje die je eruit kunt wippen met een schroevendraaier. Dan kun je precies zien wat je nodig hebt. Ben benieuwd wat je ervan vindt straks!
Dank je wel Hans. Ik ga er dan Ă©Ă©n bestellen en zal het je laten weten.
Groet,
Hendry
Hallo Hans,
Vandaag de purple fuse binnengekregen en natuurlijk meteen geprobeerd.
Helaas werkt mijn HifiRose niet wanneer ik de purple fuse plaats. Er komt geen stroom door.
Leverancier gemaild en op zijn advies de contactpunten iets verbogen, maar ook dat had geen effect. Kon helaas niet anders dan het terugsturen. Wel vreemd dat het hier niet werkt. Volgens de leverancier was het niet mogelijk dat ik een defecte fuse opgestuurd heb gekregen.
Het was dus een kort avontuur 