I recently picked up two of these (because i'm beginning to work on and modify microphones and figured since I didn't have any schoeps style circuits it would be a fun place to start) for next to nothing. As far as i can tell, they have the normal Schoeps Jfet feeding a pair of PNP transistors. I've traced the circuit and even drew up a schematic using LTspice to see what was going on circuit wise and to see the frequency response. I've only showed the plot from the positive side (XLR pin 2) as Pin 3 is nearly identical just at difference phase. Any tips or recommendations for mods on these? The capsule appears to be a K103 single diaphragm style copy, but without the correct backplate holes. They don't sound bad, but wondering on ways to improve?
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