@twoleftears Partsconnexion's ad says they are made from "Gold-Plated Copper" but without specifics it is not clear whether this is actual copper or an alloy containing copper. I could not find out any more on their website but the items in their line-up appear to be of a high quality.
Interestingly, I looked up several of the other banana connectors listed and found a wide range of conductivity based on the metal used. Bananas typically use an alloy of copper to improve ductility and durability over that of pure copper. KLEI is an exception since they use pure copper plated with silver. Below are some others and the associated conductivity relative to the International Annealed Copper Standard (IACS);
-Furez Tensioned Split Tube Banana Plug, C14500 Tellurium Copper - 93% IACS
-Mundorf BFA Beryllium Copper Banana Plug - 60-63% IACS
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ConneX Connector Banana Plug, Brass - 28% IACS
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Furutech FP-200B(G) Banana Connector, Phosphor Bronze - (? see below)% IACS
(Phosphor Bronze is typically rated from about 15-20% IACS but apparently there is an "E" version (
1.25% Phos. Grade E) that is rated up to 50% IACS.....I have no idea which Phosphor Bronze is used for the Furutech bananas)
I already own some of the Furez bananas so will use them if I need bananas.
