I have a pair of Bohlender Graebener RD 50s for sale and upon inspection I noticed what I thought were 4 tiny cracks in the aluminum conductors on the ribbons, upon closer inspection with a handheld microscope they appear to be tiny wrinkles. I don't want unhappy buyers and was wondering if anyone has seen this before. Wrinkles are only on one speaker, I measured resistance and both were identical, I hooked them up to play some music with a cap for protection of course and both played fine, sounded fine and had equal output. Any insight or opinions would be welcome.
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Tiny wrinkles in conductor on B-G ribbons