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Old 22nd November 2012, 03:09 PM   #5571
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Quote:
Originally Posted by rondr View Post
Almost finished here.
I wonder why so few people take care of shielding their SMPS. They raditate EMI inside the box, and avoiding-them to reach the amp can have only positive effects.
 
Old 22nd November 2012, 03:15 PM   #5572
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Originally Posted by mr_push_pull View Post
now the <replace with audiophile fuse price> dollars question: is that a very expensive alloy that requires very high tech equipment in order to be fitted inside a glass/ceramic tube with metal endings?

Constantan wire in small quantities is about $10 per meter, so the raw material for a fuse should cost about $0.1. No exotic or special equipment needed compared to normal wire fuses.

Only issues with constantan is a higher resistance than copper or silver, and a strong sensitivity to strain, so very theoretically it could cause microphonic effects.
 
Old 22nd November 2012, 03:21 PM   #5573
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Quote:
Originally Posted by Esperado View Post
I wonder why so few people take care of shielding their SMPS. They raditate EMI inside the box, and avoiding-them to reach the amp can have only positive effects.
the arrangement that Bruno used for demo/evaluation purposes has the SMPS very close to the amplifier board and it's unshielded. if it were that bad I'd guess that the evil effects of the SMPS would be visible in measurements.
also, it looks like everyone forgets the fact that the amplifier itself is a switching device carrying amperes at hundreds of kHz's. the PCB traces that carry those signals are millimeters away from tens of SMD devices. at least on my UCD modules.

@Julf:
then the $70 each audiophile fuses must be justified by the measures taken to reduce microphony.
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Last edited by mr_push_pull; 22nd November 2012 at 03:25 PM.
 
Old 22nd November 2012, 03:28 PM   #5574
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Originally Posted by mr_push_pull View Post
then the $70 each audiophile fuses must be justified by the measures taken to reduce microphony.
Aren't they intrinsically justified by the adjective "audiophile"?
 
Old 22nd November 2012, 03:35 PM   #5575
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Originally Posted by Julf View Post
Aren't they intrinsically justified by the adjective "audiophile"?
I must be succeeding very well in hiding my sarcasm.
truth is that I'm curious how (if) those expensive fuses try to justify their prices. and let's say that since we're on diyaudio, we like to try to understand things, not just swallow whatever the hand wavers throw at us. otherwise we have the option of blindly ordering whatever component reaches the Stereophile recommended list.
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Old 22nd November 2012, 03:40 PM   #5576
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Originally Posted by mr_push_pull View Post
I must be succeeding very well in hiding my sarcasm.
I apologize for emphasizing the sarcasm - I have found that sarcasm needs to be taken to slapstick levels to translate non-native-language and cultural boundaries.

Quote:
let's say that since we're on diyaudio, we like to try to understand things, not just swallow whatever the hand wavers throw at us.
Some of us do. Others resort to cargo cult engineering (random tweaking, tube rolling etc.)
 
Old 22nd November 2012, 03:51 PM   #5577
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Default Audiophile Fuses...

Are justified by their performance. If you do not believe it, try some at no risk yourself. Synergistic Research offers a money back guarantee on their fuses. Simple...
IME, actually using them, they offer performance gains well worth their price.
 
Old 22nd November 2012, 04:03 PM   #5578
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Originally Posted by barrows View Post
Are justified by their performance. If you do not believe it, try some at no risk yourself. Synergistic Research offers a money back guarantee on their fuses. Simple...
IME, actually using them, they offer performance gains well worth their price.
Looking at their web pages, I see a bunch of claims (" a noticeable increase in sound staging, resolution and air thanks to a lower noise floor and blacker backgrounds") but no explanation of what they think is causing the difference, apart from the "custom alloy treated with 2,000,000 volts of electricity!"

So what do you think causes the improved performance? And BTW, have you used double-blind ABX to compare them to regular fuses?
 
Old 22nd November 2012, 04:08 PM   #5579
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Originally Posted by barrows View Post
Are justified by their performance. If you do not believe it, try some at no risk yourself. Synergistic Research offers a money back guarantee on their fuses. Simple...
IME, actually using them, they offer performance gains well worth their price.
this is diyaudio, right?
for many of us, at least part of being here is about having an interest on how things work. there are many subjective forums out there where no one is interested in how and why things work, good for them. I'm not aware about any explanation for the audiophile fuses and if it's only about that negative temperature coefficient material, it looks that they have the largest profit margin on the market. so I'm wondering if there's something else that can make a 2 cm piece of wire fitted on a tin socket improve the sound.
if we just succumb to the "just listen to it, it doesn't matter how it works" then there's no point for diyaudio to exist anymore.

Quote:
Originally Posted by Julf View Post
So what do you think causes the improved performance? And BTW, have you used double-blind ABX to compare them to regular fuses?
excuse my bluntness, but you haven't been around much, haven't you? bringing DBT in any discussion of the kind is naive. it's like telling "let's just be civil" to the guy with a bat. "DBT can't possibly work" is the bat, you can't fight it, it's made of tough aluminum
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Last edited by mr_push_pull; 22nd November 2012 at 04:14 PM.
 
Old 22nd November 2012, 04:20 PM   #5580
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Originally Posted by mr_push_pull View Post
for many of us, at least part of being here is about having an interest on how things work
+1

I grew up on stuff like "Wireless World" where the authors - leading designers of their time, such as Williamson, Linsley-Hood, Bailey and Radford - explained their designs and why they thought they were better than previous designs.

I am very happy that Bruno has followed in their footsteps, and shared his design ideas to an amazing detail. The nCore deserves more than just to be chucked into a box with random "audiophile" paraphernalia based on subjective praise. But, oh, well, it is just a hobby, and what works for me might not work for you...
 

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