Serendipity - Crackling/Clipping Noise

[madbean]

Both the NE5532 and JRC4558 have BJT inputs. So, why one would cause a problem and not the other, I'm not sure. Unless there's something with input offsets, maybe? I know I have used the 4558 in this circuit in the past.

On the other hand, perhaps the problem lies in the clipping portion. Depending on how involved you want to get in this: you could try temporarily shorting the two mosfets and see if the problem persists with only the BAT41s working. This might be a good guess since the crackling is layered on top of the signal.