Iso Clean Fuses


I just installed the Isoclean fuses in my Marantz SA-11S1 SaCd player. This player has 5 fuses inside. Turned it on and boy did it sound bad. The worst tweek I have ever tried. The highs were gone. In fact the over all volume was reduced! My heart sank. Faintly remembering the info sheet says these fuses have a direction to them, I had hope. Out comes the player from the stand. Fuses pointed in the other direction, now towards tha front of the player. Back in the stand, all connections remade. When i turned off the amp I left the volume at the same level. Power on. Hurray! SET magic sound restored. The crystal clear mids are there and the delicate highs have returned.
These fuses are supposed to be placed following the direction of current. I do not know if I have each circuit fused correctly as I do not have a diagram of the current flow. But in the Marantz the fuse arrow sounds better pointing to the front versus all pointing towards the rear.
So if you try an Isoclean fuse, try it in both directions before deciding if it helps or not.
David Pritchard
128x128davidpritchard
Chashas1,
Well said.

I do not pretend for a moment to be an expert. I base my opinions on an education at, in my day, a top ten engineering school, experience in the audio retail industry, and my personal experience as an audiophile. I am knowledgeable, but not perfect.

I know that I have not tried the audio fuse. Of course, this is the big hole in my argument. If I had the means to do so for free, I might. However, my argument is that it is absurdly priced, and that it has no technological basis behind it.

In my system I can clearly hear the difference in tubes, capacitors, cables, and power line conditioners, among other things. I would make a gentleman's bet that the fuse I put in it would not make a difference. I would do that in any system because it has no basis in engineering principles. (I would also bet real money on it, if my opponent required it.) Of course I understand that the argument is that high end audio and engineering are at odds with each other. I hold that that need not be. I believe that sound engineering principles, if the designer were to pay attention to the minutiae, would coincide with great sound as far as an audiophile is concerned. That is the basis upon which I have built my system, and upon which I modify my amps.

Having worked in the industry, I witnessed a lot of snake oil being marketed. This was especially true of accessories where there is the highest profit margin. I am very skeptical of accessories and tweaks. Forty dollars is an exorbitant price too pay for something that most likely costs pennies to make. It seems that what you are paying for is perceived value and mystique. That is the only conclusion that I can draw when no one, including the sellers, can offer some technical principles for the supposed improvements on which this product is based.

I understand your Julian Hirsch comment. I am open to trying new ideas. However, I still maintain that there is a rational and scientific explanation to improvements in the music coming from the speakers. So far, there have been none concerning these fuses.
Bicycle_man ... "Audiophile" fuses are not over the top. We still have cryo-treated audiophile fuses, installed in a preferred direction, and probably more after that!
How many of you nay-sayers have actually tried the Hi-Fi Tuning, IsoClean or Furutech fuses again? Surely you're not simply offering unsubstantiated, empty opinions? I've upgraded every power supply and signal path in my audio chain with OS-CONs, FREDs, bulk foil resistors, polystyrene/polypropylene caps. Selected cables, interconnects and NOS tubes, with care, towards the most transparency possible, and done the same for many aurally pleased clients over the years. When I tried the Hi-Fi Tuning fuses in my Cary monoblock power amps, there was an obvious and quite audible improvement. The technology to actually observe electrons, and their behavior within the crystaline structures of various metals, must have escaped the professors at Case Institute. I don't remember that being presented during any of our courses.
Hi Bicycleman, you have every reason to be skeptical, based on what you currently believe and on your past observations.
So tell us, what amp are you using now? and what value and type is the main fuse?

And I'll tell you a quick story:
A friend and I had swapped amps for a while, and while he had mine, he replaced the main fuse with an isoclean. When I got it home, I thought, sounds okay, I like his amp better. After he told me what he had done, I thought that's nice, but no great shakes at all. But then I got down and inspected it, saw the directionality arrow on it, and decided to place it the other way. Oila! The difference was amazing! It was gorgeous. Now, this is certainly better than tube rolling, because in the fuse case you either have greatness or you don't, not mere differences.
Surely a man of science can relate.
Neodymium magnets, circumference treated with AVM, same area then electro insulated, circumference area mumetal shielded. Yet to determine influence of north or south pole of magnet on signal flow and resulting sound. Tom.