RM-503 oscilloscope TV project

[Notimetolooz]

Originally Posted by bandersen

I believe they used a special solder alloy containing silver for those ceramic terminal strips. Regular solder does not work very well if you need to to repairs.

That is right. The ceramic terminal strips have a coating of silver in the notches when the ceramic is fired. Silver has the right characteristics to bond with the ceramic. However silver dissolves to a certain amount in regular solder unless the solder has enough silver already. If you use enough regular solder when you replace a part, the metal will come unattached to the ceramic. It doesn't take very much silver in the solder to stop this happening, about 2% I think.