Why would a nonlinearity have to be biased to a point one might refer to as 'on' in order to possibly contribute to audible distortion?
The difference in sound was quite obvious when A/B between old/new.....the dirty/clean window comparison fits.
Surprising part was how long it took me figure it out......I knew it was off kilter but never realized how bad until changing it......funny part was the first attempt at buying wire from the hardware store wasn’t productive, I ended up buying 14awg ‘speaker wire’ got it home and realized it was cca (I thought it was a little light!) tried it anyhow and found the sound worse than the corroded monster! Finally ended up with cardas 101 for one amp and Belden 1313 for the other.....quite reasonable when you buy it off the spool.
Richard, that kimber has some relatively high capacitance, almost as much as the cardas 101 (which did not agree with my hint amp section at all)
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For the very same reason a resistor without current through has no noise. There isn't anything like distortions (or noise, for that matter) in an electrostatic problem, charge has to move around.
Agreed.
However, since cables have capacitance between conductors and during use there is opposing phase AC voltage across the conductors, as one point on a cable changes from + to - on one conductor (and the opposite on the other conductor), then electrons will move laterally by having been first repelled by the - voltage on the other conductor to then being attracted to the other conductor as it becomes +.
Of course, charge is also moving along each conductor to and from the load. It means that charge will be moving both laterally and longitudinally in each conductor, does it not?
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As far we are speaking of speaker cables, it seems difficult to use mono strand ones with big enough diameter to keep a low serial resistance. So, I doubt lot of people tried-it and can report a difference in listening comparison, don't-you think ?
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John, I'm just curious, what brand of J-fets did you use in your production JC-1+? Toshibas or Linear?
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Well, capacitors (in general, any pure reactive impedance) do NOT have noise 😀. Neither do they intrinsically distort, the material non linearity (like having electric/magnetic field dependent properties) is a different story.
Word salad ahead
: Materials have what is called a band gap between the conduction and valence bands; for metals, this gap doesn't exist, the conduction and valence bands are overlapping. When bringing two materials in contact, even a metal and a dielectric, the Fermi levels align while the valence and conduction bans are bending. This results in a potential barrier that electrons have to cross in order to provide conduction. Anything under this barrier doesn't go through, as a result no current (tunneling is a different quantum story) no noise, no distortions. Silicon diodes have a roughly 0.7V barrier, germanium has 0.2V, cupric oxide has (if it would be crystalline) a bandgap of about 1.2eV, close to silicon which is about 1.1eV. The Simmons model will give you the potential barrier for the copper-cupric oxide (if of any interest), I'm too lazy to look it up right now.So unless you bias a copper-copper oxide interface with more than the potential barrier (that's actually the forward voltage of the diode) there's no current flowing, meaning no distortions from these wire strands in contact.
What JN is describing is real, but a (less than) second order effect, currents induced in adjacent wires due to Faraday law (that is, one oxide isolated wire strand, carrying a significant current, can induce a current in an adjacent wire strand). Unless JN or anybody else could put some numbers around this effect, it is safe to consider it, for any audio purposes, negligible.
This would be a $25 donation to a charity of your choice, sir 😀. Richard, sorry for boring you with such mundane details.
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Thanks Mark Johnson and Markw4 for your links. I would think on the patent application that fig 20 would approximate a Music Rail closely enough. You should build your own Richard, we ultimately are. For the record, these circuit designs were made by Mike, our mutual associate and not Jack Bybee. Jack and Mike have worked on numerous projects together. I have only worked with Mike on a 'special' power amp over the years. Mike's new amp might even sound 'better' than my Parasound design. I don't have both to compare, but Mike also knows what he is doing, AND he has an open mind like me! That makes him a formidable opponent in the circuit design world.
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The high C would be more important if the circuit Z was high. But at low Z of speakers, the series L is much more important.
in addition, the power amp has plenty of current capacity to quickly charge the C of the cable. Not an issue... unless it causes amplifier instability.
THx-RNMarsh
I would like to buy and try before I think of spending a lot of time on it. To hear its affect and learn the potential.
Probably try it on Damir's design.
THx-Richard
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Yes, but things are more complicated when we look at bulk diode transfer characteristics. They are not discontinuous through the origin, or anywhere else for that matter until failure...
Also, regarding audio frequency signals in cable, the speed of light in cable is very fast compared to rate at which voltage between conductors change. As a consequence, it would seem that the path that charge takes through cable conductors may simply change slightly over time as voltage difference between conductors changes.
No idea if it has has any audible effect at all.
Moreover, hopefully we are not overly focusing on one element of complex low level effects in cable to the exclusion of others.
The task before the group IMHO should be to start with the assumption that listening reports such as Bob's are true, then focus on finding out what effects exist in cable and how to best measure each one.
Making a few back of the envelope calculations then pronouncing Bob nuts will get us right back to attacking each other, with the first punch being the attack on Bob.
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Hmm. Scott, is everything ok? You seem under the tech weather lately.
As to forward basing diodes, you understand we are not discussing .7 volt diodes, no?
It is trivial to run Ls/Rs scans on virgin and baked stranded zip, the results are trivially understood. As I pointed out, it is spectra, harmonics, and level of effect that are important. Anybody with an AP is better poised to measure any effect on audio, I can easily specify the required test regimen. I only have tools for pure Ls/Rs, and work the low micro joules regime and mega joule regime. Neglect the former, you end up in the latter..
Firmly soldered is a triviality. I do that daily with cables that are extreme skinners. It has no effect when it comes to dI/dt effects. I have to worry about interstrand resistivity, twist pitch, twist pitch in relation to conductor turn radius, and that is the simple cables. The six around one is far more challenging, as the inner wire sees an entirely different e/m enviro.
There is a reason litz conductors are random, always going from inner to outer, current sharing.
As to numbers, did that. I assume you haven't reached those posts yet.
Jn
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Not too boring text book regurgitation....
The oxide on copper wire does not make a very good diode. It is a fairly lossy diode... it is a more gradual interface. So, current does flow thru some of the semi material.
... details.
THx-RNMarsh
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There you go bringing actual measurement stuff into the fray...how dare you..😀
Interesting the gap between book/google and reality, no?
Had to fight gold/tin frit last year, as well as silver relay contact (non wiping) problems..you remember, the real world problems..
Jn
From the initial attempt to pataphysics to the task before the group IMHO should be to start with the assumption that listening reports such as Bob's are true I totally disagree. Enough said, I don't want to wake up the moderators with some crass language.
I'm pretty embarrassed about any of those bybee stuff. Never tried or even seen any of them, but, reading the Bybee web site and the crazy prices, you know, when it look like snake oil, when it smell like snake oil, when it is supported by snake oil B.S., what else could-it be ?
As I think my instinctive reaction can be shared by a lot of people, I wonder how a serious manufacturer can use/make a reference to those devices on a simple commercial point of view.
This said, the gear you used is some kind of cap multiplier, traditional engineering with no proton involved ? If yes, OK, but BYBEE name lead to confusion.
I have some questions. With such a big number of power devices, could we not consider different quiescent currents between each pair to make the A-AB transition smoother?
About level of feedback, how did-you make your mind ? Trying various combinations and comparing by listening ? And if, yes, any correlation with measurements or not (IM) ?
I believe you use power BJTs. If yes, why do-you have a preference for them instead of Lateral Mosfets and all their advantages (No tempco, no secondary breakdown).
Do-you noticed a change in character with the add of the cascode ?
I'm very interested to read your point of view.
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