Spark Fuse Upgrade?

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cipriano

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Spark Fuse Upgrade?
« on: 7 Jan 2020, 05:11 am »
I recently purchased a Spark for my main system and I am enjoying it so far. Probably still in the break-in stage (less than 20 hours). Has anyone upgraded their stock fuse in their Spark? I'm just curious if there are any subtle gains to be had by rolling in an "audiophile" fuse or something like that? 

Wind Chaser

Re: Spark Fuse Upgrade?
« Reply #1 on: 7 Jan 2020, 05:42 am »
Can’t speak for the Spark, but as for fuses making any kind of an appreciable audible difference, I once scoffed at the idea but now I know better.  :D

How do you like the Spark so far?

cipriano

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Re: Spark Fuse Upgrade?
« Reply #2 on: 7 Jan 2020, 07:59 am »
I like it. So far so good. I am comparing it to stiff competition - An Allo Volt+D from India. I will know more after I live with it for a week.

Audiovista

Re: Spark Fuse Upgrade?
« Reply #3 on: 7 Jan 2020, 01:18 pm »
Hi there!

It’s great to hear that you like the Spark! Mundorfs take some time to break-in, but changes are very, very subtle: if the unit (and this is my general rule when designing) does not sound good right out of the box, no amount of break-in will make it exceptional... burn-in can make mediocre product tolerable at best.

As for fuses - they are safety-critical parts, and I do not recommend changing them. The “HiFi fuses” that I have seen do not come with adequate data sheets to determine their suitability for circuit protection. All fuses operate on simple principles and I am not confident that different part with the same rating, I2t figure and time characteristic will sound different.

This is not to say that there are no opportunities for sensible and audible Spark upgrades... probably topic for a separate thread  :D

Boris

cipriano

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Re: Spark Fuse Upgrade?
« Reply #4 on: 10 Jan 2020, 01:22 am »
Thanks for the insight Boris. I will not try and upgrade the fuse. Listening to Brian Eno's Ambient 1: Music For Airports on my Spark as I type!

Audiovista

Re: Spark Fuse Upgrade?
« Reply #5 on: 10 Jan 2020, 03:41 pm »
 :wave:

cipriano

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Re: Spark Fuse Upgrade?
« Reply #6 on: 10 Jan 2020, 09:07 pm »
Just out of curiosity, have you heard of any Spark owners upgrading the 2 Mundorf caps? What would the values be, if so? Thanks!

Audiovista

Re: Spark Fuse Upgrade?
« Reply #7 on: 12 Jan 2020, 09:15 pm »
Sorry for delay in replying... 1uF caps will be adequate.

As far as I know, a customer in Germany upgraded input caps (after warranty expired) and one in Hong Kong went through more extensive modifications even though he was aware that it voids warranty - a risky proposition, but he had it done by a local expert.

Best,
Boris

cipriano

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  • Posts: 12
Re: Spark Fuse Upgrade?
« Reply #8 on: 13 Jan 2020, 11:25 am »
Any thoughts on Vdc value. Do I need to stick with 250V or can I go higher? I can't go lower, is that correct?

If I can go 1.0 Uf with greater than 250V that opens up a whole world of possibilities. Although I know size is important (can't go with crazy large Duelunds  :D

I probably won't rush into anything, just gathering ideas. The factory Mundorfs are certainly no slouches!


Audiovista

Re: Spark Fuse Upgrade?
« Reply #9 on: 13 Jan 2020, 06:07 pm »
Technically, anything rated above 50V will work. Higher voltage film capacitors will generally have lower loss and distortion, when used judiciously. 250-400V are my favorites, and I avoid going above 630V, unless required by a specific circuit.

I agree with not rushing to upgrade... one should live with a new unit for several months before upgrading: that improves chances of being objective about post-upgrade improvements.  :D