Hi Pat - what are/is the plating layers on the turrets? Silver? I assume 
the solder is tin/lead.

Dave



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[TN] Black substance






Ok got a new one.    Found on the plated portion of a turret a black fuzz, 
also on the riveted backside and the plated portions of all of the lands 
outside the soldered areas.
It cleans right off with alcohol leaves no residue, is crystalline in 
structure and grows away from the metal has a coral like appearance.

I have attached pictures but Steve is off today so don't know who else can 
post.

Again a 40 year old board.

Any ideas????

Pat

.


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