Low Temp Indium Cast Universal Galena Crystal Radio Radio Detector Diode-INB

Description

Precision Galena Crystal Radio Crystal Radio Diode
Cast in Low Temp Indium alloy
The Casting alloy Contains 50% Indium to improve the Alloy Conductivity and permitting a very Low Casting Temperature of 144 Degrees Fahrenheit.
A low Temperature Casting Temperature prevents any damage to the Galena Crystalline Structure.
My Cost of this very expensive Casting Alloy is .00 per Ounce
This Indium Casting Alloy Contains absolutely no Cadmium or Lead.
Universal Size Suitable to fit Most Older and Newer Detectors
This Cast Crystal is Brand New and recently Manufactured
Galena Crystal Detector (Actual crystal may vary in shape and size from picture)
Crystal mounted and Cast in a extremely Low temp alloy to prevent any Crystal damage
.38 inch diameter and approx. .38 inch high
Casting alloy is made from Tin, Bismuth and 50% Indium
Freshly Cast Galena Crystal to Optimize Whisker Contact
FACTS ABOUT OLD SCHOOL CRYSTAL DIODES
Not every contact position on the Galena crystal will perform, so fiddling with the ‘cat's whisker’ to find a sweet spot does take patience and skill.
Cat Whisker:
The "cat whisker", a springy piece of thin metal wire, formed the metal side of the junction. Phosphor bronze wire of about 30 gauge was commonly used because it had the right amount of springiness.
Cat whisker detector:
It consisted of a pea-size piece of crystalline mineral in a metal holder, with its surface touched by a fine metal wire or needle (the "cat whisker"). The contact between the tip of the wire and the surface of the crystal formed a crude unstable point-contact metal–semiconductor junction, forming a diode. The wire whisker is the anode, and the crystal is the cathode; current can flow from the wire into the crystal but not in the other direction.
Having a lot of patience and a steady hand are needed when you listen with a piece of the rock. But this can also be very rewarding when you can hear the first station using a cats whisker detector.
I can cast custom crystals in any virtually any size and the mineral of your choice
Just send me an eBay message and I can create a new listing of your choice in size and mineral