Re: Poor solderability of old components, solutions?
I've got some "Iskra" ceramic- and cracked-carbon resistors acquired at a bargain price some time in the 1980s (before Yugoslavia imploded). These have the difficulty-of-soldering issue - I use one of the little fibreglass brushes on these as a matter of course. Works every time!
The worst things for soldering, I find, are brass battery-tags which have ever suffered any kind of corrosion due to leaking electrolyte. Such tags go coppery-red when cleaned up, but the 'copper' is porous because the Zinc has been dissolved out of it, and it then won't reliably take solder.
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