One crystal microphone.

Limited availability, can not be restocked.

These appear to be NOS (New Old Stock) crystal microphones. Aluminum case, with Japan stamped on back, no other data is available.  See dimensions below.

Great for radio and electronic project experimenter use, vacuum tube circuits, music instrument pickups, anywhere a high impedance microphone is required.

We have been told it is NOT an exact fit for the Astatic D-104, and might require modification to fit.  Unusual and hard to find item.

The elements have been tested for normal, consistent output with an oscilloscope.

High impedance, resistance measures open on 20 Megohm digital multimeter range.  NOTE:  Impedance test was done on test sample, items for sale are not subjected to voltage.

Aluminum case measures 0.98 inches in diameter, 0.37 inches thick, solder connections on back.


See our other listings for more Radio, Electronic and other RARE and UNIQUE items.

The seller makes no representation of any item(s) sold to be fit for a particular purpose and assumes no liability for its use or misuse. It is assumed that the unit(s) will be installed and operated by qualified personnel. The purchaser agrees that the seller shall not be held responsible or liable for any injuries or damages, whether incidental or consequential, associated in any way with the item(s). 


Photo below shows side and back views, you are receiving one piece.

See our other listings for other crystal mics.