Hi-Fi Fuses - SNAKE OIL? - or something in it?


There's a lot of chatter about the benefits of those high prices gold plated fuses with silver conductor etc. etc. all over the web and the consensus ranges from FANTASTIC!!! to much more subtle observations.

It makes sense to me, epseically in light of spending lots of $$$ on good power cables, that having a skinny piece of aluminum conductor in a glass tube (i.e. a cheap fuse), in the power loop would be detrimental to the performance of the components.

I decided to revamp my DIY power supply I'd built for the Cambridge Audio 640p phono stage and DACmagic in order to test this out - and since it's a DIY project there is no UL Certification to void.

First, I bypassed the fuse link completely to confirm there would be an improvement and give me the best benchmark to compare against - YEP - BIG DIFFERENCE - much more this, that and the other :-)

So then I started looking for hi-fi fuses - WOW!!! - talk about pricey.

Two fuses for the power supply was going to cost $120+ AND I thought I'd probably have to buy a better quality fuse block to make the most of those fuses.

Then a moment of enlightenment - most power supplies and conditioners are protected by pushbutton breakers and not fuses.

I found breakers of the required current rating and installed them into the power supply. I imediately noticed that there was no deteriation in fidelity when compared to the same unit with the fuse link bypassed - GREAT!.

On reflection, the fuses I had in place were rated at 3 amps - so they use a pretty thin fuse wire in them. If I had used a fuse of a higher rating, i.e. it uses a thicker conductor, then I believe that there would be less of a difference between the fused and bypassed implementations

SO - do the expensive fuses work?

Well the empirical evidence out there would suggest they do
- I do know the cheap fuses are not good!

I know bypassing them does improve the sound - a lot in my case
- BUT THAT'S NOT SAFE FOR ONGOING USE

I know breakers work as good as bypassing the fuse
- BUT MESSING WITH A POWER SUPPLY VOIDS UL CERTIFICATION - NOT GOOD!
- FYI a couple of licensed technicians I know WILL NOT change the design of a power supply at all.

I believe the amount of benefit is related to the fuse rating
- but don't go replacing 3 amp fuses with a 20 amp fuse - that's not safe either.

Whilst looking for fuses I discovered AMR Gold fuses priced at $20/fuse.

Now that's definately more affordable than most others at 3-4 times their price.

One supplier I know of in the US is Avatar Aacoustics

If you have had experience with quality fuses please share - especially if they are "modestly priced" i.e. $20-$30 per fuse. And please provide a source :-)

Also, can anypne confirm that Slow blow fuses are better than regular?

And Remember - IF YOU AIN'T LICENCED - GET A TECHNICIAN!

Many Thanks
williewonka
Inasmuch as those same AR speakers would be bested by most entry level sub $500.00 speakers of today, I am not sure folks would be as fooled as they were back in the old days.

That's a little like saying those same folks who viewed a 1950's TV wouldn't find much difference in a 4HD or whatever they call the latest in television technology.

I can say that my Aqos HD blows away my Marantz RPG, which back in the day was at the top of it's game.

Audio has moved on, and I admit that some of the old stuff is still good even today.
My old 1974 Acoustat montor X's are testament to that.
Except for the fact that they have had a few thousand dollars worth of upgraded parts.

The upgraded parts are the reason the Acoustats sound as good as they do.I know, before I had them upgraded, I knew how they used to sound back in the 70s.

But all the rest of the stuff I plug into the chain is also better than it was in the 70's.

I've put a lot of effort into getting the best electrical connection as I can to my gear,which means dedicated lines, upgraded connectors and even fuses.

All the stuuf that others will say can make no difference, has for me and in every other system where the owner has done similar improvemnts.

In fact listening to the before and after effects of some simple revisions to the power delivery to my friends system took me down the same road and I am very happy I did follow along.
My problem is that I don't have finances to pursue it to the level that he has.
And he is still experimenting with different power cords and their effect on his DCS dac.

So when does it all end?

It doesn't have to end,who says it's supposed to?

It can begin with a simple fuse, and end there I suppose, but what's the fun in that?
Neither arrogant nor presumptuous, but why then aren't such outstanding cables/fuses part of the OEM kit? Surley the ultimate amplifier maker would want to scrimp here & there so some other company could pick up what should be his domain? I'm certainly skeptical. I don't know which is easier...to prove they are an improvement or to prove they're not.
Dragon1952 wrote,

"IMO, to say that an upgraded fuse or power cord can't improve SQ because it "defies the laws of physics", or some other science, implies physicists and other scientists have learned 100% of everything there is to possibly know...which is pretty naive or arrogant if you ask me."

That's tellin' 'em, Dragon!
Expensive aftermarket power cords are seldom offered as part of the deal when purchasing a quality product simply because it comes down to a matter of taste and how one's system is already "voiced".
If you have a systen that tends to be warm or romantic as most tube systems are, you may want more of that or less of that and so you look for a power cord or product that gives you what YOU want.
This is why most gear comes with power cords that cost next to nothing that do the job,but don't really give you the performance that the component is capable of.

Hey, you or I have to do the homework and put in some effort to chhose what's right to our ears.
Some folks are quite content with what comes in the box, others are not.
I have access to some high end gear in another persons system and even gear priced in the $100,000.00 per component don't come with much more than throw away cables.
Needless to say the throw aways are thrown away until the right match , and then the full majesty of the pricey stuff shines thru.
I've heard it and as I said, that's how I was converted to switch my audio purchases from endless gear swaps to investing in things that really matter and improve what I have.And will improve what I purchase in the future ,or on to another round of searching for the right recipe.

The casual listener won't understand any of this stuff,be he a novice or a lover of the old tried and true system he has loved since day one back in the 70's.

But my old 70's Acoustats never sounded as good as they do now since I replaced the RCA and IEC inputs with the best Furutech has to offer,And yes I use HiFI Supremes(4 in total) in these amps also.

Before the changes, the sound was fine, most folks would have not gone any further.
I did, because I experienced what such simple mods using better updated parts can do from lessons learned in my friend's set up.

This is stuff that is voodoo to a lot of people,you are not alone Gvsale, I have a few audio friends like you, who just can't be bothered to try stuff that will improve their sound.In fact one is reluctant to even try a better power cord on his amp, because if he likes it,and can't afford it, he won't ever enjoy his current system again.

And I'm not belittling folks like that.
Everyone has their own take on what level they are willing to take their system to and I'm aware of all the associated
constraints that are involved when one has a family and the more pressing monetary demands of such.

Whether a manufacturer includes designer fuses or power cords doesn't diminish his efforts to bulid the best he can.
But neither do they state that their gear must only use a specific and supplied interconnect or speaker wire, although Naim and Spectral are two who used to share such thinking.

But times and attitudes change,some manufacturers now design their own power conditioners when once upon a time they frowned on them.
Naim now has gone for a more user friendly type of connection.

If some company supplied and I paid extra for a designer power cord that didn't match my sound, then I would be upset about this and feel ripped off.

People like to have the opportunity to pick and chose the sound they want, whether that is different from the designers intention or not, it's a fact of life, that no two people really like all the same things and sound is a very personal thing.

The more exposure I had to a variety of very good systems tended to alter some of the feelings I had about "how great my set up is".
You learn there are many different voicings .
It doesn't matter which one is correct, because none of them are, it's all an illusion and no one has arrived at the perfect cookbook for the perfect sounding 100% accurate system.

Even if you recreated all the same gear as what was used in the mastering studio, you would only approximate the sound in your home and only for that one particular piece of music from that studio at that time.Your listening room would sound different than the recording sound room with all it's differnt dimensions and room treatemnt.

Everythingelse will be different,so one size will not fit all.
One power cord will not fit all, nor will a fuse or anythingelse.

The only piece of gear that is immune to most of the voodoo would be a wind up RCA turntable with cactus stylus and horn.

No power cord, no power conditioning, no dedicated lines or fancy connectors, no interconnects,no speaker wires,no fuses.
Nothing much to argue about.
It was a simpler time, and for the music lovers of that era, state of the art and as good as it can ever get.
Then things changed.

For better or worse I'll let you decide.
I know where I stand.
For now, what does one need to do in order to take advantage of such a marvelous power cord when all (my assumption) amplifiers don't have detachable power cords?

This means you have to "tear" into the chassis & start replacing the leads up to the fuse holder? Then what happens...if on the other side of the fuse holder the type of wire to the the transformer turns out to be "substandard." Is the next order of the day to throw out that transformer & have a custom built one made to replace the OEM? If there was a chance that the unit came with a detachable cord like computers use, what would happen if that socket was "found" to be "substandard." What would be next? I'd like to know what gage of internal wire is used to build all these suprelatively performing electronics VS the "also ran" units.