I've been wondering for a while why it is that D'Addario makes their light gauge (J62) only in 80/20 bronze (brass) and the medium/heavy ones (J74/75) only in phosphor bronze. Is there a fundamental reason for this, to do with the mechanical properties of the alloys at the different string tensions, or is it just a question of supply and demand? Why not make a light gauge string in phosphor bronze or a heavy one in brass?
Martin
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