eBay

Set of TWO unused crystal microphones.

Great for radio and electronic project experimenter use, vacuum tube circuits, anywhere a high impedance microphone is required. Unusual and hard to find item. We have no technical for them.

All elements are tested for normal, consistent output with an oscilloscope.

These elements have lower output than larger sized elements. They must operate into a high impedance load.

Elements measure 'open' on the 60 Megohm DC resistance scale of a DMM, which is normal.

Plastic case measures 7/8 inches in diameter, 7/16 inches thick. Has 2 leads attached as shown.

Below is actual feedback for this item, at the time the listing was originally made.

swell little crystal mics - Thank you!
shipped fast and packaged well
very pleased with transaction
Smooth transaction. A+
Sounds OK but not that fuzzy
Excellent transaction all around. I highly recommend this seller.
+++AAA Item as advertised, packed well, shipped quickly.
Great product. Great ebayer A+++++
Thanks, all good here.
Got'em. Thanks. Quick Shipping AAA+++
Very happy. Thanks.
Nice purchase
Good transaction
Very fine job!
Great ebay seller A++++++++++++++++
Good transaction. Thanks.
Smooth transaction. Prompt shipping. Thanks
100% o.k. for me, Thank you very much

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).

See our other listings for another similar size mic, and a larger crystal mic, see photos below.