Ron Hardin wrote:

There were some with an actual cat whisker instead of the diode,
but we went the modern way mostly.

I had a crystal set in the 1960's that used a real galena crystal which
was mounted in a small metal cup. The cup served as one of the
electrical connections for the crystal. The crystal was embedded in some
kind of metal which I assume was poured into the cup in a molten state.
Could it have been lead?


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