Edward A. Feustel wrote:
"jm" wrote in message
...

Hi,

I need informations on old radio system based on galena stone.
Is there anyone on this newsgroup that is specialist in this or is there
anyone that can route me on another newsgroup more appropriate or any
community ?

Thanks for answers


I think you are speaking of galena crystals that were used in crystal radio
receivers.
The junction with the galena crystal rectified rf signals that were
amplitude modulated, producing
an audio output directly to headphones or an amplifier.
Ed


Yes exactly, In fact I'm French and I didn't know before your response
the exact term. Thanks for that.
Somebody told me that the wire directly in contact with the galena
cristal must be in bronze. I would like to know if someone could confirm
this and if it's correct I should be very interested to know where I
can find some.