This question might be better suited in another thread but I thought I would get some opinions here first. My friend has an SR500 with a very week sounding A string, but only with the blend knob rolled forward with the P pups on. I suspect that its the P pups? I pulled them out and they look like they have an internal pre-amp? I was thinking of trying to swap out the pups with some P's I have lying around just to check, but not sure if standard passive pups will work or not? Anyway, any help on whtat to do or anyone else have the same problem to share would be greatly appreciated!