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Original Message
I don't think you need to do that
Posted by Ralph on June 2, 2017 at 10:51:51:
Just use ground as a reference for the servo, so the DC output is 0V.
As far as the input, each preamp side will have its own resistor to ground so that the preamp can function; that value should be 23.5K so that the load on the cartridge is 47K.