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RE: w, we're sort of all tweakists; that's why we're in this particular Asylum.

I would be very careful about adding a 5k resistor unless I don't fully understand the design. Even then I would ask, why didn't the designer add one in the first place?

Adding a buffer like the BUF634 on an existing PCB might not be possible. But an OPA627/637-BUF634 combo makes for a great, very dynamic preamp. The OPA627/637 usually isn't suitable for low-impedance applications like phono stages and mic preamps, though.

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