Copper varies more because of slight impurities and more because of heating variations, i.e. tempering of the metal. Drawing, annealing and tempering are variations that have no electrical requirements but can have an effect on winding a string, not so much in the quality of the string but how the winder is effected. Electrical wiring fabricators are the sources of copper for our strings. We are such a miniscule consumer that WE have to bend to the available materials. Newton nhunt@jagat.com
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