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Old 29th April 2009, 12:04 AM   #1
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Question Solid vs stranded wire in amplifier circuts

OK...another musing from this toob noob. What is the logic regarding stranded vs solid wire in amplifier circuts? All vintage amps I have worked on have stranded wire...easier to manipulate because it's more flexible ? The amp I just built...with LOTS of help from this forum...I used solid wire. Probably about 22ga...leftovers from my day job and proper colors as well. I like it because you can keep it routed where you want it and it is easier to insert into crowded terminals. Any input? Advantages/disadvantages of either?
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Old 29th April 2009, 01:18 AM   #2
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Default hey - don't you know?

wire is only usable if its oxygen-free, teflon coated, cryogenically treated and available from a single supplier by invitation only. Outside of those specifics, any wire will fatally degrade the signal path, inject noise, delete bits from a data stream, switch your fridge off overnight and leave your dog pregnant. Sheesh. It must be true - Audiophile Noodlers Monthly tested it and said so.
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Old 29th April 2009, 01:28 AM   #3
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Solid core wire has less resistance than stranded. Stranded has less tendency to break after being bent several times. I use solid core wire inside my amps. You wouldn't want a solid core wire for something like a power cord, the copper would eventually crack from being moved around.
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Old 29th April 2009, 01:38 AM   #4
rdf is offline rdf  Canada
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Default Re: Solid vs stranded wire in amplifier circuts

Quote:
Originally posted by bereanbill
I like it because you can keep it routed where you want it ....
That's a big advantage. It allows short direct shots between nodes and doesn't require harnessing or bundling interconnects to keep it neat. When your signal is swinging hundreds of volts with high drive impedance every pF counts.
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Old 29th April 2009, 02:02 AM   #5
DHT112A is offline DHT112A  United States
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Actually I believe stranded wire is lower in resistance. Electricity only flows on the surface and since stranded would have more surface it stands to reason it would be lower resistance.

http://www.stanford.edu/class/ee281/...esistances.pdf
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Old 29th April 2009, 02:11 AM   #6
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Default solid core has less resistance?

really? How so, in practical, day to day application?
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Old 29th April 2009, 02:16 AM   #7
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Default oh puleeease

you must be a card-carrying member of Audiophool Elite Core to beleive that solid vs stranded has any realistically measurable difference at the sort of currents and voltages present in a valve amp. Capacitance possibly, but even then, only at the margins. Mechanical issues as noted are the BEST possible reason for selecting one over the other. IMHO.
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Old 29th April 2009, 02:31 AM   #8
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Default Re: hey - don't you know?

Quote:
Originally posted by aardvarkash10
wire is only usable if its oxygen-free, teflon coated, cryogenically treated and available from a single supplier by invitation only. Outside of those specifics, any wire will fatally degrade the signal path, inject noise, delete bits from a data stream, switch your fridge off overnight and leave your dog pregnant. Sheesh. It must be true - Audiophile Noodlers Monthly tested it and said so.
AND Silver coated and sleeved in raw silk insulation

You'll get your best improvements with proper routing, using shielded signal input lines, and twisting leads that need to be twisted (like AC filament wires). Well - using the proper gauge of wire to carry the required amount of current helps a lot too!!

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Old 29th April 2009, 02:55 AM   #9
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Quote:
Actually I believe stranded wire is lower in resistance. Electricity only flows on the surface and since stranded would have more surface it stands to reason it would be lower resistance.
I'm having trouble understanding how stranded 16-ga wire has more cross sectional area than solid, unless the overall diameter of the stranded bundle is larger than the solid core, in which case I have learned something today which would be a good thing.

Skin effect is frequency dependent and is quite a bit deeper than these strands are thick for audio frequencies. Read the wikipedia article on skin effect. There is a nice table for skin depth vs. frequency for copper.

Quote:
you must be a card-carrying member of Audiophool Elite Core to beleive that solid vs stranded has any realistically measurable difference at the sort of currents and voltages present in a valve amp. Capacitance possibly, but even then, only at the margins. Mechanical issues as noted are the BEST possible reason for selecting one over the other. IMHO.
I never said it was measureable in a valve amp

I believe RDF was saying you could route neatly and not run wires parallel and bundled. This could have a measurable difference in some situations. In all but extreme cases I would expect it not to.

Really mechanical reasons are the right answer to use solid core, just don't use it where the wires will flex or vibrate!

Trust me, I'm no Audiophool. I'm one of the biggest skeptics here. I also understand that it takes only one counterexample to disprove a theorem. Never say never unless the answer really is NEVER.
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Old 29th April 2009, 03:07 AM   #10
DHT112A is offline DHT112A  United States
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Sources where "anyone can edit it" are not credible.
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