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Old 10th Aug 2021, 11:32 pm   #13
emeritus
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Join Date: Jan 2012
Location: Brentwood, Essex, UK.
Posts: 4,808
Default Re: Ferranti TC1004. Baptism of fire.

Copper progressively diffuses into solder and thereby progressively raises its melting point, which is why old solder joints can be difficult to melt. The usual solution is to apply fresh solder to the old, which should then make the old stuff melt. If necessary, you can then remove the old and new solder mixture and apply fresh solder.

Last edited by emeritus; 10th Aug 2021 at 11:33 pm. Reason: typo
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