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Old 6th September 2010, 03:12 AM   #431
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I agree with John regarding actually testing the material, and suspect that SY is ahead of the game given his training, occupation and access to the appropriate equpment.

It would be unwise, this far in, to allow conjecture to rule over emperical evidence - surely the reason we are here in the first place...
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Old 6th September 2010, 03:28 AM   #432
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The preferred high reliability lead material for military resistors is pure, solid nickel. I have many, many resistors with this type of lead.
Solid nickel, yes. But not nickel over copper, except perhaps for gold plated leads which these obviously are not.

And again, Bybee claims the leads are copper, not nickel.

se
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Old 6th September 2010, 03:28 AM   #433
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Quote:
Originally Posted by aardvarkash10 View Post
I agree with John regarding actually testing the material, and suspect that SY is ahead of the game given his training, occupation and access to the appropriate equpment.
Speaking of SY, where the hell is he?

se
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Old 6th September 2010, 03:52 AM   #434
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I now suspect that the leads are copper alloy with silver plating or maybe, nickel plating instead of silver. There are military grade leads with this spec.
 
Old 6th September 2010, 03:57 AM   #435
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SY is wearing a white trench coat, hunched over in his laboratory making evil scientist noises.

Either that or enjoying a nice bottle of wine somewhere.
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Old 6th September 2010, 04:03 AM   #436
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Originally Posted by Cal Weldon View Post
SY is wearing a white trench coat, hunched over in his laboratory making evil scientist noises.

Either that or enjoying a nice bottle of wine somewhere.
I hadn't realised the two options were mutually exclusive...
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Old 6th September 2010, 11:17 AM   #437
Cassiel is offline Cassiel  Libya
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Quote:
Originally Posted by aardvarkash10 View Post
this far in,
We haven't even passed through the leads, can't imagine what would happen when we reach the "nucleus".
 
Old 6th September 2010, 11:26 AM   #438
SY is offline SY  United States
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Quote:
Originally Posted by aardvarkash10 View Post
I hadn't realised the two options were mutually exclusive...

They're not.

The leads are absolutely not plated copper nor copper alloy- no amount of scraping causes copper to appear. And the attraction to magnets is fierce- when I held a loudspeaker a few inches over the workbench, the parts literally flew off the table.

There's pretty simple test for nickel that I'll run- basically, it's digested in nitric acid, potassium hydroxide added to bring the pH to something over 9, then adding DMG (a chelating agent). A red color indicates nickel- white precipitate in the alkali step indicates iron. The leads do solder well, so I think jlsem's speculation is most likely correct.

Whichever, the physical specs given by the manufacturer and vendors (size, materials) are false. And audiophiles who believe that ferromagnetic leads are the antichrist should beware.
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Old 6th September 2010, 12:28 PM   #439
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Perhaps JC could snap a few photos of the exposed copper after scraping?
 
Old 6th September 2010, 12:39 PM   #440
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SY, you do have entry level parts only. At a budget price 180 USD. You need to order more expensive and valuable devices, priced at least at 4.000 USD!
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