2. cables
  3. 124345-1776

Direction of aftermarket fuses (only for believers!)

It is with reluctance that I start another thread on this topic with the ONLY GOAL for believers to share their experience about aftermarket fuses.
To others: you can call us snobs, emperors w/o clothes,... etc but I hope you refrain posting just your opinion here. If you did not hear any difference, great, maybe there isn’t.

The main driver for this new post is that I am starting a project to mod my NAD M25 7 ch amp for my home theater. It has 19 fuses (2 per channel, 4 on the power supply board, 1 main AC) and I will try a mix of AMR Gold, SR Black and Audio Magic Platinum (anyway that is the plan, I may try out some other brands/models). As it is reasonably difficult to change them, esp the ones on each channel module that requires complete disassembly, I would like to know what the direction is for these models mentioned and of course, others who HAVE HEARD there is a difference please share your experience on any fuse model you have tried.

Fuses are IME directional:
Isoclean is one of the first to indicate the direction (2008/2009) on their fuses. Users of HiFi Tuning (when the awareness rose quite a bit amongst audiophiles) have mostly heard the difference.

As an IEEE engineer, I was highly skeptical of cabling decades ago (I like the speaker design of John Dunlavy but he said on many occasions that cables nor footers matter at all, WRONG!). Luckily, my curiosity proved me wrong as well. I see the same skepticism that I and many others had about the need for aftermarket cables many, many years ago now on fuses and esp on the direction on fuses.

Another example is the direction of capacitors (I do not mean electrolytic types). Even some manufacturers now and certainly many in the past did not believe it can make a difference sonically. Maybe some do but it takes time in the assembly to sort and put them in the right direction/order (esp as some of the cap manufacturers still do not indicate "polarity") so that maybe is one argument why this is not universally implemented.








jazzonthehudson
jea48
2,944 posts
 
geoffkrait
Just as I suspected. You can’t.

Ignorance is bliss. Google can be your friend.


Two freebies, no charge.....


Quote:


What is a NRTL?

A Nationally Recognized Testing Laboratory (NRTL) is a third-party organisation that certifies products for the North American market.


http://www.tuv-sud.com/activity/product-certification/nationally-recognized-testing-laboratories-nrt...

>>>>>>>>>>>>>>>>>>>>

Quote:


“Certified” or “Listed” means that:
•
The product has been tested and certified to comply with a product safety standard.
•
The product was tested and certified by an accredited third-party certification agency, also known as:
Nationally Recognized Testing Laboratories (NRTLs)
•The product is listed in the NRTL’s registry of certified products.
•The product manufacturer has license to bear the NRTL’s mark on the certified product.
•Manufacturers can then mass produce that certified product for use in any location.
12


Types of Full Certification: See page 15.


http://iaeisj.org/sitebuildercontent/sitebuilderfiles/newjersey_iaei__navigating_the_certification_m...


geoffkait's avatar
geoffkait
14,147 posts
 
That’s all really interesting Jea48 but what’s it have to do with audio or audiophile products? Everyone knows there is *such a thing* as third party testing, in fact I was involved at one time with third party testing for VERY big projects, you know Government and Military projects. But the challenge to you was produce any case of an *audio product* that required or third party testing. And you couldn’t. In fact you didn't understand what the bet was.  So I win.

jea48
2,944 posts
 

geoffkait,

You're an idiot!

geoffkait's avatar
geoffkait
14,147 posts
 
Jea48 wrote,

"geoffkait,

You’re an idiot!"

I didn’t see that coming. Be that as it may that you still haven’t provided a single example of a audio product for which third party testing is required is duly noted.

mross1949
17 posts
 
I was certainly a skeptic years ago, when I first tried the old Hi-Fi tuning fuses. Of course, I never expected that they would turn a $20K system into a $50K one and I was not disillusioned: they didn't . But they did make an audible -- and much more significant -- difference than I ever expected they would and I still have them in my equipment today.
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