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Old 18th Aug 2022, 11:23 am   #16
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: 'Spirits of Salts' as soft solder flux?

If it's metal chassis soldering, Mark, then you may simply not have enough heat to get whatever flux you hae tried fully active. A brute of a soldering iron is needed.... 200W or so.

As plan B a bolted solder lug is a viable alternative, even if not original looking.

If it's wire out of a transformer, then "heavy formvar" varnish doesn't solder through and no flux will touch it that wouldn't destroy the copper. The usual tool is a set of motorised spinning blades which machine off the varnish. This is the varnish for proper serious transformers, designed to run hot and survive.

David
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