Fuse directionality

Fuse directionality

Postby rateourmover » Mon Sep 04, 2017 5:23 pm

Here I am, buying catastrophically expensive fuses to replace the standard ones at approximately 400 times the price. Unlike the standard ones they are apparently DIRECTIONAL. So, your mega bucks can be largely negated by putting them into your equipment the Round Way Wrong...

If you have kit where you don't know which end of the fuse holder is the Hot end - and all documentation is unclear or non-existent, what to do ?

I'm aware of the "listen and see" advice but if it means moving the hotel a little to the left just to change fuses it becomes an unattractive option. Add to that the typical burn-in time for these fuses is around 200 hours so I can't be sure if the rubbish I'm initially hearing is burn-in or Wrong. Add to that it may be that Directionality is acquired with use - and how do I then assess turning around that directionality after a fuse is allegedly zapped with a trillion volts of Quantum Stuff before I even get to unpack it.

Gnawing nails to the bone in the foetal position is no way to enjoy your hi fi.

To be specific, and in case helpful, I'm talking about Hovland HP200 pre-amp, Hovland Radia power amp (8 internal and 2 external fuses), Nakamichi CR7 (I doubt even they know where the fuse is) and an Ayon CD35 SACD/CD player. Not to mention a Naim NAT02 Tuner or the highly modified EAR 834P phono stage lying fallow at present.

As you may detect, I've sort of decided which of my next itches to scratch but am somewhat apprehensive.

Any advice VERY gratefully received.
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Re: Fuse directionality

Postby Ayre Conditioned » Mon Sep 04, 2017 7:36 pm

I thought about upgrading my fuses, but because of the very issues you bring up, I decided not to. I have since found two inexpensive tweaks that have improved the sound of my system for under $5.00.
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Re: Fuse directionality

Postby madrac » Mon Sep 04, 2017 8:00 pm

Ayre Conditioned wrote:I thought about upgrading my fuses, but because of the very issues you bring up, I decided not to. I have since found two inexpensive tweaks that have improved the sound of my system for under $5.00.


Mind sharing?
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Re: Fuse directionality

Postby JimTimP » Mon Sep 04, 2017 8:53 pm

Since you can't make fuses of a larger gauge to be more responsive to transients (or whatever marketing mumbo jumbo they are selling them with), I can't for the life of me see where upgrading fuses to those cost tens of dollars is anything but hocus pocus.

But then, I also have an issue with those people who spend hundreds if not thousands of dollars buying power cords the size of small branches, plugging them into power outlets cryogenically treated and made out of 5 nines copper and gold plated. All connected to 14 Gauge Romex house wiring in the wall on a shared circuit with the dishwasher. :shock:

You cannot usurp the laws of physics. Sure, you can use contacts plated in gold, but the fuse holder is zinc plated something. I get lost by those thoughts that seem to have lost the end-to-end solution.

I guess what I'm saying is $40 fuses are (IMHO and IME) not going to improve the sound of the music beyond a placebo effect. You will most likely forget about them, until the blow and those $40 fuses are now $60. And since AC current flows both positive and negative, I'm scratching my head on fuse directionality.
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Re: Fuse directionality

Postby MOON » Mon Sep 04, 2017 9:39 pm

I just went through this last week. I replaced synergistic research original synergistic sr20 fuses with their new black fuses. Yes, they are directional. You place them in the direction where you get the most detail and soundstage, easily heard by the way.

I kept the lids off both my pre and phono stage while doing the directional changes. The black fuses offer a big sound ipgrade. I already had a black fuse in my amp. These fuses take around 100 to fully break in. Yes, the synergistic black fuses are expensive however well worth it once you hear the improvement. 30 day money back guarantee.
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Re: Fuse directionality

Postby Ayre Conditioned » Tue Sep 05, 2017 11:48 am

madrac wrote:
Mind sharing?


That would bring out the double blind listening test police who would tell me that I can't possibly hear any difference.
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Re: Fuse directionality

Postby JimTimP » Tue Sep 05, 2017 1:30 pm

Here's a tip if you want to do that double blind test. Start with NEW off the shelf run of the mill fuses.

Fuses will deteriorate over time and their resistance will increase. It's why fuses blow for no known reason.

So, start with 25 cent a piece fuses before you listen to those 60 dollar a piece fuses. Because, unless you replace the 75 cent fuse folder and the 2 cents a foot wire leading to them, and solder with 4 alloy, silver and gold bearing solder, You have not improved a thing. Except several commercial sales peoples bottom line.

Weakest link folks. That's where the trouble is.
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Re: Fuse directionality

Postby Mr_Putty » Sun Nov 25, 2018 1:09 am

My testing has popped way more speaker fuses than I could afford if they were the high dollar ones. I have not seen any discussion of what I am now doing, so for someone with a bit of time and patients consider this: Generic fuse end casing is chrome plated over some alloy that is copper color. (the round Cooper Bussman brand is what I am using) My current fuse test is in my speaker signal path. Using a good loupe it is easy to see that the signal transfer plating is not very smooth. And the chrome is just another layer the signal has to cross to get to my speaker. So, I put some black Friction tape on one end and lightly clamped the fuse in my drill. Using some used wet dry 320 grit paper I removed most of the plating. Then I switched to 3000 grit paper and finally used clear coat polishing compound. I used a paper towel in the final polishing. With both ends polished I added a blue tape wrap on the glass. I not saying the tape makes any difference, that’s just what I did. Then I cleaned the fuse contact points with MoFi contact enhancer, and installed them with matching orientation (only to be consistent). If I were more patient I would have removed all of the plating (see photo). I do think the result is audible. I hear tighter drums and better bass definition. So, it seems there is another worthwhile tweak within my budget.
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Re: Fuse directionality

Postby Golear » Sun Nov 25, 2018 4:15 pm

I love my Hi-Fi Tuning fuses. I bought a mid-level one and a premium one. The premium one is a lot better. So I wouldn't skimp on them. They're among the very cheapest mods/enhancements out there.

A Hi-Fi Tuning fuse made a HUGE difference on my Classic 3. I'd start there, then do the phono stage, the pre and then the power amp.

The Hi-Fi Tuning fuses are, indeed, directional. Do one at a time. You can take months and months dealing with this. But that's what makes this a hobby. If your system doesn't reveal a difference when you reverse the fuse, there's something that needs to be looked at.
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Re: Fuse directionality

Postby YoungDave » Sun Nov 25, 2018 7:31 pm

This fuse business requires a leap of faith - that is, a belief not justified by engineering practice - that I will not make. You can tell me about how much they improve the device, but I do not believe it and furthermore, I cannot imagine any circumstance that would lead me to waste the time and money "testing" the proposition.

Cheers!
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