I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in a string itself vibrating in a magnetic field, almost identical to a ribbon microphone. To couple the string to an amplifier an impedance matching transformer is used (as well as in ribbon mics). Can I avoid designing a transformer and use an active preamplifier instead? Here is my naive take on its schematic
The resistance of a string is a fraction of Ohm. It's decoupled and weakly tied to the ground via high value resistors to suppress capacitively coupled external interference. What else I have missed? What drawbacks does it have in comparison to a transformer?