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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
mapman's avatar
Ag insider logo xs@2x
mapman
15,679 posts
 
So gotta ask this question.

Is it a fact that there is no "snake oil" involved with fancy fuses?

Based on my experience, I would say there is no basis to say this is a fact.

Almost anything marketed for profit is likely to include some "snake oil" in the mix to make things more appealing.

Are fancy fuses any worse than the norm?

I'd say in general high end audio in general is perhaps worse than normal, with the more "esoteric" products providing a strong bias that way.

I'd say fancy fuses qualify as a fairly esoteric product. Definitely NOT the most out there in concept though.
schubert
4,867 posts
 
Prices are high in audio because the makers know damn well we're a bunch of suckers. And I'm first in line.
geoffkait's avatar
geoffkait
14,147 posts
 
And something is happening here
But you don't know what it is
Do you, Mister Jones ?

You have many contacts
Among the lumberjacks
To get you facts
When someone attacks your imagination
But nobody has any respect
Anyway they already expect you
To all give a check
To tax-deductible charity organizations.
You've been with the professors
And they've all liked your looks
With great lawyers you have
Discussed lepers and crooks
You've been through all of
F. Scott Fitzgerald's books
You're very well read
It's well known.

:-)
geoffkait's avatar
geoffkait
14,147 posts
 
Mapman wrote,

"Regarding fuses, I would say its a fact that no two electrical devices, including fuses, are 100% equal. Even two instances of the same design may not function 100% equivalently. So it is reasonable to expect that each performs differently. How much so and to what effect is the only question case by case. Plus all teh things that go along with that to determine value, which is pretty much always in the eye of the beholder/consumer."

I don't think I've seem quite so much angst and bs in more than a fortnight.
pack
14 posts
 
OK, I guess you guys think with your audio hearts and thats OK,after all if one thinks its true then in his ears it may be so. But if you do a square wave sweep thur a circuit with its well thought out fuse you will see no difference at all. I stand by my statement that its all in your head, please take no offense, I think your passion is why we love the Audio arts and this love drives the engine of progress.
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