Re: Poor solderability of old components, solutions?
Some emery paper leaves an oily residue, first rule with soldering is everything as to be clean, i do like other scrape the wire clean.
I cannot find the report now but a housing estate was troubled with failed copper water pipe joints, the copper pipe and joints were top quality, the investigators found the problem of a plumber using a type of emery paper that left an oily residue that ruined the internal soldered joint in the couplings.
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Frank
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