> for gold to be used, resistance to corrosion must be important. from google, copy pasta: "Gold plating is the deposit of a thin layer of gold metal on a subs

> for gold to be used, resistance to corrosion must be important. from google, copy pasta: "Gold plating is the deposit of a thin layer of gold metal on a substrate, typically in the 0.25 – 5 micron range (0.00001”-0.0002”)." Not a lot of gold is used in plating the business ends of an RCA cable or TRS connector. Al, yes, more copy pasta: "Aluminum has a very high affinity to oxygen. When a new aluminum surface is exposed in the presence of air or any other oxidizing agent, it quickly develops a thin, hard film of aluminum oxide (or hydrated oxide in non-stagnant water). This aluminum oxidation is precisely what makes aluminum so corrosion-resistant." But I doubt the thin, hard film of aluminum oxide conducts as well as gold. Nope.[1] [1] https://hypertextbook.com/facts/2006/EuniceHuang.shtml https://hypertextbook.com/facts/2006/EuniceHuang.shtml