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SiriusHardware · 3rd Jul 2022, 2:10 pm

Agree, it's flux which was part of the original soldering process. The modulator is a large metal can which can absorb a lot of heat so the process of soldering those tabs would have required much more heat, solder and flux than on the other solder joints.

Don't worry about it.

3rd Jul 2022, 2:10 pm	#3
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,568	Re: Rust on the PCB? Agree, it's flux which was part of the original soldering process. The modulator is a large metal can which can absorb a lot of heat so the process of soldering those tabs would have required much more heat, solder and flux than on the other solder joints. Don't worry about it.