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Why is so much general purpose connecting wire so hard to solder?

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jonpaul:
 Today (2 Jan 2023): We just struggled to get a WWII reconstruction debugged, with   vintage axial 1/2..1W resistors and capacitors,  plated but oxidized leads. Just found   5 poor connections  that looked OK at first glance but were in fact cold/intermittent solder joints.

That caused several unrelated issues. Just touching the board or probing made the bugs come and go.

Our  nice HOT Metcal SP-200 (my 1992 design!) with Kester 44 core 63/37 Eutectic tinned every bad solder joint nicely. All working reliably !

Jon

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