Re: Poor solderability of old components, solutions?
A lot of the fish-cans these days are aluminium.
Check with a magnet to see if it's plated-steel or something else. [I can confirm that 'Branston' baked-bean cans are solderable, plated steel, having today used a slice of one to make-up a grounding strap for the outer-braid of some thick coax]
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