Negative ground bass overdrive

[JebemMajke]

Hi i need an negative ground od for bass. I've built a Russian bass booster/preamp with a negative ground and it makes my friends yamaha rbx 170 ( with 2 year old strings!!! ) sing like heaven. And i would like to put an od in the same enclosure, nothing too harsh, just a subtle OD ( this one is too harsh http://www.youtube.com/watch?v=xrRi25jZRFY, and this one is almost what i want, but i would like more OD http://www.youtube.com/watch?v=VHQx7PxFIgI ).

[JebemMajke]

I guess this thing is what I'm after http://www.youtube.com/watch?v=swNwK3MlcSs

[Earthscum]

I own one of those. They aren't too bad, but I loose low end. It is basically a tube screamer, but with a  (Fender?) type tone stack, with the bass and mid essentially fixed. Basically, the tone stack sucks a big one, IMO.

Look up the Hermida Zendrive, then take the input cap and double it to .1uF, output should be good. It is basically a Tube Screamer with some nice clippers, excellent drive, and a RAT tone section. I would also try a .22uF instead of the .1uF to ground in the feedback section.

Then take a look at how the FX91 "Blends" the dry and wet signals and copy that. It's pretty simple. I'm still at a toss-up whether I mod my FX91, or just build a "ZenBass" from scratch.

[JebemMajke]

I guess ill go with diodes first, just for the experiment. But your idea of "zenbass" is cool. I'll give it a go. Thanks for advice.