awade replaced the North common path op-amp AD829JR (U3 on the schematic), and this has removed our huge offset on the North common path, which has removed our saturation of the PZT path.  Good jorb!

We have become curious as to the level at which the PZT path rails with excitations applied to the input of the common path (Test Point 1).  The output of the PZT path is represented by Test Point 19.

100 Hz, PZT output rails at input excitation of 16 mVrms. 

1 kHz, PZT output rails at input excitation of 16 mVrms. 

10 kHz, PZT output rails at input excitation of 24 mVrms. 

100 kHz, PZT output rails at input excitation of 147 mVrms.