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The only time I use Silver solder is for speaker terminals, is has less resistance.
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This is a good example of taking a small tidbit of knowledge and extrapolating beyond reason. Okay, so you know that silver is more conductive than lead or tin or even copper. So you think silver-bearing solder must be more conductive than regular solder. But is it? I doubt it. This stuff is only 2% silver, which isn't much. The reason it's in the solder is not to make the solder more conductive - that's got nothing to do with it. The reason silver-bearing solder exists is to prevent the solder from leaching silver from silver-plated contacts. It has other characteristics that can be positive or negative depending on the situation. But the conductivity of the solder has nothing to do with it. Besides, if your soldering skills are good you'll have direct contact between the conductors, rather than having gaps between them that are filled with lead, tin, and maybe a little silver.
But then again, silicon is only semi-conductive. Maybe we should mix in a small amount of silver. For that matter, a vacuum is a relatively poor conductor. Maybe we should fill up 2% of that empty space inside our tubes with silver.