You guys are bound and determined to have a cable thread, aren't you?
I don't disagree with anyone who believes there are "technical" reasons for the efficacy of thin cables, or thick cables, or multi-stranded cables, or solid core cables, or Litz cables, braided cables, tubular cables, flat cables, ribbon cables, retangular cables or any other sort of cable they might choose. Most of us who ascribe to cables as components believe there will always be a technical reason for the things we hear. We do not find our answers in tea leaves, chicken bones and voodoo shamans. We believe in the value of technical theory and reasoned thought but cannot always find such midground among those who prefer to scream for the blood - and body parts - of the snake oil cable salesperson. As our current election cycle has proven there are goof-ball extremists on the far side of any argument. That those in the middle have such a difficult time agreeing on those things where there should be common ground is regrettable because they are often held apart by those very extremists who wish to do nothing more than shout louder than their opponents.
I'm not familiar enough with Carver's amplifier to discuss what he has done. That Bob Carver is an iconoclastic designer is not in question. The long term value of his thinking might be questioned to some extent since iconoclastic design has often driven his products, IMO, more than longevity and evolution of thought has managed.
I have a feeling the difference between current and voltage sources is more than just "a small amount of additional resistance in the 'current' output type."
If you read Nelson Pass's articles on his current source amplifiers, they represent an entirely unique construction method that cannot be achieved by simply adding resistance to the outputs. If the additional bit of resistance in parallel with the speakers is the answer to "tube sound", based on the thinking that transformer coupled amplifiers have a typically higher output impedance than a direct coupled design, then you would find that thinking falls apart very quickly with just a bit of resoning.
If resistance were the simple answer, anyone running too thin speaker cables over a long run and adding resistance by way of such cables to, say, remote speakers or rear speakers in a surround HT system would be hearing what could be described as "tube like" sound from those remote loactions. That doesn't happen.
Increasing the impedance of a direct coupled output stage by a few tenths of an Ohm isn't remotely the same as the complicated impedance and saturation effects that occur with variations of the signal frequency and current delivery in a transformer coupled amplifier. Nor would the addition of even a few tenths of an Ohm bring the typical direct coupled output stage to the average nominal impedance of a transformer coupled amplifier. Would the addition of a few tenths of an Ohm change the sound of the typical tube amplifier considering it may have a nominal output impedance of 1.0 Ohm or higher? To a small extent yes, depending upon the actual speaker load and its reactance but most listeners aware of the frequency response deviations that result from such high output impedances/reactive loads would agree that change would not make the sound more "tube like" nor would it be more desirable. It would simply result in broader frequency response deviations in the speaker's output.
And placing a relatively large amount of resistance in parallel with a driver doesn't produce "tube like" sound in an electrostat or any other driver. It controls the driver's inherent desire to ring. Try a Zobel network intead.
If you boil the tube sound down to ringing, then I guess you could make such an argument but I'm unaware of anyone who feels this (ringing) is the real answer to why tubes and transistors seldom sound alike. The typically high output impedance of a tube amp results in a lower damping factor than the infamous and fabulously high 1000:1 Bob Carver has promoted for the last three decades, but once again that is not the answer to why tubes tend to have more "air" than transistors.
A solid state amplifier driving a pair of electrostatic panels will still sound like a solid state amplifier and a Quad II-forty will always sound sweeter on a pair of 57's or ESL's.
As to magnet wire suffering less from "skin effect", first of all, I think you are confusing magnet wire and solid core wire on a basic level. This may be just a matter of terminology in some cases, however, the distinction should be made when you get around to discussing "skin effect". Either solid core cable or magnet wire can be had in such a gauge that skin effect could be a very real consideration. However, to the cable naysyers, this would only be a consideration when the signal has far exceeded the frequency range where audio signals travel. And so the very mention of skin effect in a cable thread is likely to draw harsh criticism from those who would have all cables be alike if they measure alike at audio frequencies. The implication that skin effect is relevant at audio frequencies will result in the "engineers" in the crowd questioning your education and your sanity. Therefore, I prefer not to venture down the path of whatever might draw such criticism as no opinions will be changed by the mention of such "voodoo" thinking. I use thin cables is about all I will say on that matter.
The conductor legs are spaced apart and are sufficient to carry the required current and voltage in my system. Unlike the unwieldy 12 A.W.G. solid core "anti-cable" cable sold at fairly steep mark up for simple magnet wire with spades attached, the dielectric on my cables remains thin yet protected by another thin layer of a relatively benign material. I use this cable for both interconnects and speaker cables. This is a major difference between my thin cables and the average audiophile cable. In this area I readily admit these thin DIY cables are not for everyone as they are not going to withstand the abuse heaped on too many cables by too many audiophiles. Nor will they appeal to the cables as jewelry crowd. In my system, for what I value, and for a few friends who are also using essentially the same cables, they work as desired despite all the reasons they might not.