Don't bend your wires, don't touch them at all!
Apr 18, 2011 at 3:39 PM Post #2 of 19

Steve Eddy

Member of the Trade: The Audio Guild
Aka: TempAccount555
Joined
Sep 28, 2003
Posts
6,609
Likes
546


Quote:
Cold working your interconnects can reduce conductivity by 2 to 3 times.



Yup.
 
Creates dislocations in the crystal lattice which reduces the electron mean free path and hence reduces conductivity.
 
You can always re-anneal the wire, but the insulation won't like it much.
biggrin.gif

 
se
 
 
 
Apr 18, 2011 at 7:55 PM Post #6 of 19

revolink24

Headphoneus Supremus
Joined
Jan 12, 2008
Posts
2,881
Likes
43
I can now see companies marketing completely inflexible "cable" for millions.
 
Apr 18, 2011 at 8:24 PM Post #7 of 19

cegras

100+ Head-Fier
Joined
Nov 26, 2008
Posts
426
Likes
10
I don't know, actually. But I remember how people were distinguishing between different elemental platings on connectors, which amounted to distinguishing the difference in the Fermi surface of a material ... and this is probably masked by the amount of bending and twisting you do to a cable when you move it around in between listening.
 
Apr 18, 2011 at 11:38 PM Post #8 of 19

SalsaPodio

New Head-Fier
Joined
Sep 23, 2009
Posts
17
Likes
10
You aren't really plastically deforming the Cu unless you bend the cable quite a bit. Therefore you aren't creating any dislocations.
 
Considering you are using drawn wire, there are already a massive amount of dislocations present, not to mention the low stacking fault energy of Cu, which gives it a huge propensity for twinning. 
smily_headphones1.gif

 
Apr 19, 2011 at 12:01 AM Post #9 of 19

SalsaPodio

New Head-Fier
Joined
Sep 23, 2009
Posts
17
Likes
10


Quote:
Cold working copper to 1% strain reduces conductivity by a factor of 100.



And I'm not sure where you are getting that info, but between coarse grained Cu and nanocrystalline Cu there is about an order of magnitude difference in the conductivity, not 2.
 
Just look at this paper about differences in conductivity due to twinning in nanocrystalline Cu
 
http://www.synl.ac.cn/org/mat/llu/PDF/japchen201006010686.pdf
 
Apr 19, 2011 at 12:37 AM Post #11 of 19

BobSaysHi

Headphoneus Supremus
Joined
Jun 28, 2010
Posts
3,370
Likes
90


Quote:
And I'm not sure where you are getting that info, but between coarse grained Cu and nanocrystalline Cu there is about an order of magnitude difference in the conductivity, not 2.
 
Just look at this paper about differences in conductivity due to twinning in nanocrystalline Cu
 
http://www.synl.ac.cn/org/mat/llu/PDF/japchen201006010686.pdf


lol, he was joking
 
 
Apr 19, 2011 at 3:11 AM Post #14 of 19

Steve Eddy

Member of the Trade: The Audio Guild
Aka: TempAccount555
Joined
Sep 28, 2003
Posts
6,609
Likes
546


Quote:
Considering you are using drawn wire, there are already a massive amount of dislocations present...


Only if you buy it "as drawn."
 
Otherwise, most all of the electrical grade copper wire out there has been annealed.
 
se
 
 
 

Users who are viewing this thread

Top