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Ad Detail with Photo for Listing #1744860

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MISC - For sale: BRUSH Piezoelectric headphones

.
For Sale Piezoelectric (aka crystal) headphones
manufactured by Brush Clevite Factory.
Perect condition.
.
Extremely power sensitive (~120dB/mW, which is
necessary for crystal radios that are
powered entirely by
the radio waves they receive.
.
Piezoelectric headphones are electrically
compatible with modern audio signal sources.
.
Some people use BRUSH headphones
to make crystal microphones.
.
Asking $25 plus shipping, continental US only.
Payment by USPS Money order or by Personal Check.
My home address is good in QRZ.
.
Thanks for looking, KB9OLM,
SAN FRANCISCO EAST BAY AREA.

Listing #1744860 by KB9OLM
Last Edited on 10/14/25
Submitted on 10/01/25
Submitted from c-73-252-208-133.hsd1.ca.comcast.net

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