I don't have permission to share the Sadowsky preamp schematic, however, I can describe it to the point that you can develop your own. First off, it's a Blackface preamp done with JFets. The tone stack is scaled appropriately...which is to say, the 100K slope resistor becomes a 10K slope resistor and the capacitors go up by a factor of 10. For a built-in, you've got a 500K audio pot for volume up front instead of after the tonestack. 2x 2N5457 You could add a mid-range pot in lieu of the fixed resistor, which is 750 ohms instead the 960 you would expect. I've been told that the Aguilar two-knob built-in is the same circuit, but I can't confirm it.
I sort of think it's ironic that some bassists will say, "I'm all modern here with active electonics and all. I need a flat pre-amp." They're really just playing through a Fender.
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