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This is similar to the old Berning TF-10

That preamp was prone to sounding different on account of the chip used in the servo, which was not really sorted out.

The goal is to have the circuit immune to the opamp(s) used.

We had to solve the same issue when we developed our MP-1 preamp back in the late 1980s. The MP-1 has a direct-coupled balanced output.

The thing to do is to hang a capacitor off the output of the servo so as to give you additional filtering. Experience has shown that you want to give it a nice long timing constant; IOW its going to be an electolytic.

Another point: you can integrate the response of the opamp by using a capacitance in the feedback loop of the opamp. So you don't really need the low pass filter as a separate circuit, although it won't hurt.


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