Hi,
In my eyes this is an example of a bad designed circuit.
* 0.1u and 1k input LPF creates a high pass filter with 1600Hz cutoff frequency
* 1k and 100k generates a gain of 100, but the 741 is not suitable for this (high frequency cutoff)
* an electrolytic capacitor in an audio path generates distortions
* 741 is not suitable at all for audio circuits (if you expect some quality)...expect noise and distortions
--> look for another preamp circuit ...with audio quality. There are plenty good circuits in the internet.
Klaus