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Burn-in revisited

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Ash View Drop Down
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    Posted: 20 May 2021 at 7:11pm
I reckon subjecting an extruded conductor to a very strong electric field (high voltage, high energy per unit charge) could affect net dipole alignment or net dipole moment in the conductor. Not that the size/magnitude of the signal would vary at all going one way instead of the other but I reckon it could affect timing of the signal. It could cause phase shift, not loss of amplitude. Signals are alternating currents but they aren't necessarily symmetrical across the x-axis.

High voltage flash testing is an industrial safety test for the insulation around wires when they are made, to make sure that electrical faults don't allow the insulation to ionise and become conductive of high currents and cause harm/death, I guess. I would have to read more, this is just conjecture. I have no evidence.

Also, mechanically bending a metal isn't going to alter dipole arrangement.

Bottom line is I'm not a researcher so I have no idea about dipole moments in copper.


Edited by Ash - 20 May 2021 at 7:45pm
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R66 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote R66 Quote  Post ReplyReply Direct Link To This Post Posted: 20 May 2021 at 9:53am
Hi Ash, Why would Audio cables be subject to "Hi voltage flash testing" because if they are not changes to a piece of wires Molecular structure during manufacture is still a possibility. I cant engage on a science level but just bending a wire back and forth changes its structure.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2021 at 11:52am
At school, I was taught that metals are typically comprised of metal ions floating in a sea of electrons. So the electrons are delocalised and do not have to remain within the vicinity of their respective ions. This is part of the explanation for the efficient electrical and thermal conductivities of metals. Energy transfers like these propagate at high speed through the material. Metals are often described as uniform or isotropic in their chemical structure but this is not necessarily the case for their charge distribution or dipole moments, which are part of the explanation for magnetism, whether it is induced or permanent.

So if we consider that metals are fairly uniform in structure but when it comes to dipole alignment, there can be some variation (imagine a permanent version of Van der Waals forces in chemistry). If there may be subtle differences in the behaviour of charge and their motions and how they transfer signals down the length of cable so there could be a small difference in bias, caused as previously suggested, during high voltage flash testing when manufactured. Magnetic fields and electric fields are not simple things to understand but this is where I believe the explanation lies. I have personally been able to perceive differences in bass focus and phasing when I tried swapping cable direction in the past and I really don't think it was placebo.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote R66 Quote  Post ReplyReply Direct Link To This Post Posted: 19 May 2021 at 8:26am
My understanding of cable directionality and i can certainly hear the difference. Is when the copper wire is drawn through the die the molecular structure lines up in a certain way. So the signal can either be with or against this flow.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Ash Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 11:22am
Power supply will make a significant difference to the performance of audio electronics. The Reflex C was once a flagship product for moving coil so use of a switched-mode power supply will prevent it from conveying its full potential.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 10:40am
Originally posted by Bnes Bnes wrote:


I have purchased a new Reflex C phono stage



Who the hell sold it to you with a "green" PSU?

I'd prefer a proper judgment even if the other guy wins, than being legged down right from the start!

Graham
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RichW Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jan 2021 at 9:12am
Hi Bnes,
Give it at least a couple of weeks of continuous power. Patience is needed with run-in.
GSP don't supply the Reflex C with the 'get you started' green PSU - probably for good reason.
The PSU1 should improve the Reflex C noticeably - strongly advise you to try one before making a final judgement.
Majestic/Enigma, Accession MM & MC.
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