I want to replace the preamp in this lovely bass. Just to experiment. I can't afford to swap pups right now, and I may leave them alone anyway. But I am not sure of what preamps would be electronically compatible. I am told that MTDs high end USA stuff have Bartolini preamps (and pups) so that seems like a logical choice. But I know there are lots of great preamps out there. This bass has a 3 band EQ. Also blend pot and a volume pot. Any suggestions would be much appreciated! Thanks.