Carborundum Crystal for Philmore or Whisker Crystal Radio Diode with Threads

Description

These Cast Crystals Have a Threaded insert. This is a significant advantage for the Do It Yourselfer that is constructing their own Crystal Radio Detector stand since you only need a screw to secure it to the base of your stand instead any metal clips. While these have a threaded insert, the threaded insert is not needed for many of the older style Philmore Stands and just doesn't need to be used.
Carborundum For Philmore or Whisker Detector Crystals Are Here and now with a Threaded Insert
Genuine
Carborundum
High Grade
Carborundum
Semiconductor Crystal Radio Crystal Radio Diode Cast
Perfect for a Replacement or DIY Detector
Crystal has a 3mm Threaded Brass Insert For Mounting
The Brass Insert is Molded into the Alloy during the manufacturing process
See the Crystal Detector construction Cross Section Image in the picture Gallery
The actual crystal shape you receive may vary slightly from picture
Crystal Has Been Electrically Tested
Crystal Mineral Size and Shape may vary from Photo
Carborundum
Crystal Radio Crystal Radio Diode Cast in Low temp alloy. Universal Size Suitable to fit Philmore or Most Older and Newer Detectors
Casting alloy is made from Lead ,Tin and Bismuth-(NO Cadmium) and Freshly Cast
Carborundum requires a High contact force and can often be achieved with a phono graph needle or just a metal plate to contact with. The early Carborundum detector stands used the crystal with a metal metal plate to contact with.
No whisker is needed.
Carborundum is very stable once it is set correctly and will not require any additional adjustments once set correctly. It is most critical to have the contact force or pressure set correctly to achieve the long term stability.
Carborundum is not a very radio-sensitive material.
It turns out that Carborundum's problems can be mitigated through the careful application of what is called a "bias voltage." The idea is to use a small battery to apply an electrical potential on the detector to make it function properly.
Note: A typical bias circuit diagram is in the Photo Gallery.
1 piece
Crystal
Carborundum
Detector
Crystal Size 13mm Diameter and Approx.. 9mm-11mm
Tall
Casting alloy is made from Lead, Tin and Bismuth-(NO Cadmium)
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