John Curl's Blowtorch preamplifier part II

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#52,841
RNMarsh said:
Only if you think in terms of physical contacts, perhaps. Such as relay contacts and oxides on the contact surfaces which can be mechanically broken thru.

If there is an N (copper) and a P (oxide) then an N (copper) again there is a continuous voltage drop across the copper/oxide/copper path. That oxide level break-thru voltage could be a potential issue over time. Keeping an open mind about it.

When you consider a new copper penny coin's color and the change in color after only a few days.... we are all listening to heavily oxidated copper wires. Historically, the High-End solution is to not try to measure it so much as to just eliminate it... enter OFHC.

THx-RNMarsh
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Richard, your argument falls apart like a cheap suit...what does a new penny have to do with copper?😕

jn
 
#52,851
He look copper ....... 😛
 

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#52,852
Cables

Why is a PreAmp thread in Lounge ?

******

Does it make ANY difference if the current is AC or DC ? Power cables / Audio cables.

Anyway, the snake oil vendors are going to have a field with this 😀

Yeah, who can forget !

Don't forget, the terminal voltage of a system is:

V = L dI/dt + I dL/dt
Click to expand...

Originally Posted by RNMarsh

When you consider a new copper penny coin's color and the change in color after only a few days.... we are all listening to heavily oxidated copper wires
Click to expand...
.

Except that insulated cables therefore aren't exposed to the air, shouldn't suffer. Many times i've cut several inches etc off years old cables to replug etc them, & the copper is as new !
 
#52,853
Left photo has a lot of oxidation... right one a little better.

Ultra-Pure copper BTW is a pale pink color. Yours are turning dark brownish... oxidation. but they are power bars (?) and not signal wires. And you have good air tight connections.

Anyway, time to go beddy-by. Just something to think and talk about --

THx-RNMarsh
 
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#52,858
SE,
I was only being facetious, I really expect that Richard is just messing with us. I have cut wire open even in an automotive environment that were 40 plus years old and the copper wires looked fine. Now if I was on a sailboat I might be a bit more careful in a saltwater environment but otherwise I see this all as a red herring.
 
#52,859
JNeutron...re-written. Sorry about that:

What happens if you have wire that is either pulled or extruded,the former striae along its axis, the latter other radially and normal to the axis? After oxidation, don't these produce boundary conditions which could be described a "semiconductor" or "Capacities" ? Would these not affect the signals propagating down the wire?

I see you are all talking about this, just wanted to clarify my question.
 
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