The acid core flux they sell for soldering copper pipes
does a good job on old copper.
Rick N6RK
Tony Brock-Fisher wrote:
> What's the best way to clean old, brown oxidized stranded copper wire so
> it can be soldered? Many times I need to modify or repair old wire
> antennas. I've tried sanding with 400 grit and also wire brushing.
> Nothing works well and quickly - mostly it's tedious, and the
> solderability is mediocre at best.
>
> Any ideas?
>
> -Tony, K1KP
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