Sure a bit, but many homes have some air conditioning or humidity control.
How is the metallurgy better?
Some pure copper is not alloyed, so unless we are talking crystalline structures or something else… then how is it better?
I am no expert in how wire is made, but I assume that it is drawn or formed in much the same way now as 100 years ago.
Aside from whether it is speaker wire or IC cables…
And aside from the safety concerns…
I think we are missing the point of “WHY” the Western Electric in particular is renowned as being good.
- Was it the copper itself?
- Was it the cotton?
- Was it the varnish on cotton?
And the other point that may have been missed is that the insulation may be as, or more, important than the metal.
Especially for ICs.
In some digital wire the insulation may only be protecting the wire. Any stuff happening to the signal will either be decoded correctly, or result in bit errors. If we take the transatlantic undersea cable, then inductance and capacitance matter, but ICs are shorter.
However in terms of the capacitance, and speed of transmission, and the physics of what is happening, then the insulation plays a role.
Whether the capacitance, or speed, matters or not I don’t know… certainly the speed would not seem to be a factor compared to the capacitance. And the capacitance may not be as much of a factor with sources that have lower output impedance.
Having made exactly the same cable with different dielectrics, it makes a significant difference in sound, and there are measurable differences in dielectric absorption, triboelectric noise, mechanical damping and of course propagation speed.
The wire's manufacturing process and material purity also matters, TPC vs OFC vs UPOCC copper all sound different, annealing wire can also make for a difference. I don't know a lot about the intricacies of drawing wire to it's final diameter, but that process does have an effect on the structure and grain boundaries of the wire, forming it into a chevron type structure which is likely responsible for directionality of conventionally drawn wire. I think we can assume the machinery used to draw wire is not exactly the same as it was decades ago, even though the process may be the same in general. Small differences in how the wire is drawn are likely to have an effect on the grain structure of the wire and may account for at least part of the reason why vintage WE wire sounds good.
Also, while some WE wire may be "salvaged" a lot of it was sold as NOS (New Old Stock), and has not been used before. I have used at least a half dozen or so different WE wires and they were all NOS and in surprisingly good shape for their age. I still have some heavy gauge tubular wire I've been meaning to make into a PC, but unfortunately that source dried up well over a decade ago. It's pretty hard to find genuine WE wire anymore. It is good wire but modern UPOCC is better.