2020-01-10 Corrosion and Damage On Diode Leads

This photo is a detector diode that was broken during replacing the electrolytic capacitors.  The lead on the top was twisted, apparently putting stress on the glass package.  I replaced it with a 1N270 germanium diode.

comment from fb group Vintage Transistor Radios

Did you notice that the leads are magnetic? They stick to the speaker magnet or tools. I think they use an alloy like kovar to make the leads have the same temperature coefficient as the glass package. So the alloy has iron that rusts and corrodes much faster than copper. I’ve replaced stranded copper wire that had wicked up battery juice and was corroded inside, but it was still conducting okay. It just wouldn’t tin with solder.

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