Dear Eldartford: The last Piezo that I use was a very very old Zenith, because of time I can't comment nothing about. I never knew any High Fidelity unit like you mentioned, sorry.
Strain gauge, well Sao Win ( Win Labs ) designed one: the SDT10 that I never heard and that had not much success and in the last CES was presented a new strain gauge cartridge design that I can't remember the manufacturer. The strain gauge design has some advantages because there is no magnets/coils/armature/moving mass ( there are no problems with capacitance, impedance, hum and the like ), it can go down to DC!!! and goes easyly to 40-50kHz ( flat ), needs its own preamp that could be its " weak " link.
It will be interesting to test this one straing gauge cartridge bis a bis a " normal " one and compare the quality sound reproduction of both. Any one out there ( in controled conditions ) already hear it?
Regards and enjoy the music.
Raul.
