Micro Acoustic Cartridges


Does anyone remember the operation principle of these cartridges?
128x128leica1925
I owned one of the 2002 series (when my ears were younger) and I remember fantastic amounts of "micro" detail.
Yep.  Loved the 2002e back in 1978.  It was pretty good in my basic system powering Large Advents.  Piezoelectric, if I recall.
Tubegb, thanks for the link. I have never heard the shimmering symbols on Paul Simmon's " Slip Slide'n Away" reproduced better than a Mico Acoustic cartridge did it. Also, the rain in "Fresh Air One" was extraordinarily palpable.