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Vintage inductor - crystal radio loopstick coil antenna


Vintage ferrite loopstick coil.
JW Miller 6313 adjustable inductor, 0.5mH - 5.0mH range. Appears to be NOS (new old stock). Screw adjustment works fine, and we have confirmed its value on an LC meter.
The winding is a sophisticated progressive High Q design. The outer side of the coil can be unwound to lower the inductance. We have done this on an identical coil, and successfully used it in a crystal radio receiver (see photos).
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NOTE: Photo showing partial winding removed.



Vintage inductor - crystal radio loopstick coil antenna