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
Lacee: Not all designs lend themselves to that kind of modification. From power cords to internal wiring.

I still think its a stretch that a fuse, now as simple as it is could be such an object of desire, so to speak. At some time, I'll just let that go.

If the gear priced in the statosphere (today's reality) has been built with a cost is no object way, it still seems kind of odd that someone might still find shortcomings (non "audiophile" fuses). No one has mentioned if any products such as that actually have gold cryo treated fuses, fuse holders etc. Aren't many or most of these "mods" driven by the aftermarket?

Certainly, my particular stuff would suffer greatly from such changes. But that's neither here nor there...If, for example the power cord on my 7T can handle 1100 watts, that is 9 amps, & the tested load as I use it, averages 1.5 amps or less, how much more overcapacity might one need for something to show up? It is also fused @ 1/8 amp. & comsumes 9 watts. And, let's not for purpose of those questions, consider audio performance as subjectively as some do here.
Gvsale,is your gear so perfect that it cannot be improved?
You fear your "stuff would suffer greatly from such changes".
You are 100% certain of that?

You are throwing a lot of stuff out there such as "how much more overcapacity might one need for something to show up".

That may make sense to you, but you are missing the point about upgrades.
It's not about how much bigger,it's about how much better.

I used an upgraded fuse in a DecWare Zen 2 watt amp that cost 1/6 the price of the amp.
I plugged a Shunyata Annaconda power cord into the amp,the power cord was almost 4 times the cost of the amp.

Neither upgrade morphed the amp into a Krell with a 1000watts,but, Mr.Deckert and others will tell you that it's how good the first watt sounds that matters most, not how many.
So gear that can handle 1100watts /9 amps using a 1/8 amp fuse means moot to me.
I'm just concerned about how good I can make those all important first few watts sound.

So irregardless of what you think audio is all about,it means somethingelse to others.

In my experience, the amp just performed better with the fuse and power cord upgrade.
Those two watts were cleaner, more robust and would lead you to believe they gave you a few more watts than the two I started out with.

Of course that wasn't what was happening.
What was happening was that those important first few watts were given a bit less distortion, and because the electricity was cleaned up, or made to flow a bit more freely, the sound also was able to bloom.
More of what makes an SET low watt amp sound so pure and good,just became more apparant than before.
Subjective,yes, but repeatable results none the less.
Switching things back to normal, or stock, was a step back in information detail, clarity,and there was a loss of body.
Put the power cord and fuse back in and the little DecWare sprang back to life, able to reveal just how good this little wonder is.

But the same results are there when I use upgraded power cords and fuses in my cd player,and speakers, and phono stage.

That spare Annaconda is now used to power up my $60.00 TerDak power supply!
And yes way overkill, but it makes my Lightspeed Attenuator sound so much better than the wallwart.
Remember, it was a spare, I certainly don't think anyone needs a power cord of this price to make the TeraDak sing, but it hasn't hurt it's performance or made the gear "suffer" because of it.

So a pretty decent amp for the money can sound even better with upgraded fuse and power cord.The amp doesn't have to be 1100watts, it can be a two watt amp.

The power cord was a spare from when I ran mono blocks, I wouldn't suggest that anyone with a DecWare amp needs an expensive power cord or fuse to make it sound good.
But it is also good enough to let you hear the improvements such stuff can make.

If there was no difference in sound I could have concluded two things.
The first would be that which you might conclude, that the amp was so good it didn't need any help.

The second conclusion would be one that I would make, the amp was of such poor design and so distorted that nothing could make it sound any better.

I have personally never owned any piece of audio gear that was so good or so bad that it's sound couldn't be improved with an upgraded part or two.
That goes for vintage and new tube gear, solid state, and any speakers that were fuse protected.
It was easy to hear how anything with a power cord or a fuse was hindered by the quality of the fuse and power cord.

I hate to keep rehashing the fuse issue, but it was Peter Aczel from the Audio Critic of the late 70's early 80's who brought this to my attention way back when.

Nothing has changed,except that we now have some alternatives to using stock, sound degrading fuses, if we choose to.

Until this happened I was bypassing them,enjoying better sound, but was skating on thin ice.

Thankfully that's no longer necessary.
Snake oil, plain and simple. And, unless your power cord cannot handle the amperage required, spending uber bux on a PC is a fool's game.

Think about it, why is it that NO hi-end mfgr. I'm aware of includes these magic beans (fuses and PCs) with their gear? If these things *really* improved the sound, they would be installed at the factory. This is a prime example of audiophilia nervosa trumping common sense and basic electrical physics...

-RW-
Pack nailed it, the "improvements" you hear come from expectation bias. After all, if you spend $5,000 for a power cord and $100 for a fuse, you damn sure *will* hear an improvement. Wake up fellas, your expectations are trumping common sense and basic physics...

-RW-
Lacee wrote: "And from this you might even conclude that anything, even a simple fuse,that is in the signal path can also have an effect on your sound."

Lacee, the fuse is NOT in the signal path. It simply allows the juice to flow to the equipments' power supplies - no more and no less. Expensive hi-fi fuses are a prime example of audiophile snake oil.

You guys crack me up...

-RW-