those of you who have built the Sadowsky bass preamp

[Sensei Tim]

I've built a few of these and they've always seemed to distort when I use my EBMM bass, but when I split the coils it seems to be much better.

I've put trimmers on both JFETs which helps a little bit but not all that much.

I've only tried JohnK's layout with the volume at the output - does the other version with the volume at the input help with the signal clipping?

[rocket88]

I could be wrong, but I think the issue is that the EBMM is an active bass with a lot of output from the onboard preamp and its slamming the Sadowsky. Splitting the coils will reduce the output, think humbucker vs single coils in a guitar, there by reducing how much input is hitting the Sadowsky preamp. See if you decrease the volume from the bass does it decrease the distortion of the Sadowy. I have a similar issue with a Jazz bass I built that has an OBP-3 running at 18V, and I can’t run it into anything I want clean with the preamp switched on.

[Sensei Tim]

Mine are passive pickups (Warwick rockbass $$).  I should try running the preamp at 18v and see if that helps with headroom.

On Sun, Apr 14, 2019 at 10:50 PM rocket88 [via Guitar FX Layouts] <[hidden email]> wrote:

I could be wrong, but I think the issue is that the EBMM is an active bass with a lot of output from the onboard preamp and its slamming the Sadowsky. Splitting the coils will reduce the output, think humbucker vs single coils in a guitar, there by reducing how much input is hitting the Sadowsky preamp. See if you decrease the volume from the bass does it decrease the distortion of the Sadowy. I have a similar issue with a Jazz bass I built that has an OBP-3 running at 18V, and I can’t run it into anything I want clean with the preamp switched on.

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[j-pee]

so, what happened? :)

[Sensei Tim]

It’s still sitting on my desk looking at me lol.

I think it’s because I built the version with the volume at the output rather than at the input.

Seems like volume at the input could be used to reduce a hot signal and reduce clipping.