Two tube preamp for bass design

[billyz]

I think you can have your cake and eat it too with the Baxandall.

http://amps.zugster.net/articles/tone-stacks#Baxandall

Also, download the Duncan tone stack calculator to see the controls in action.
http://www.duncanamps.com/tsc/

With a few mods the baxandall/james stack can be quite flexible.

Remember with the bax circuit to get a mid boost your cut the treble and bass, increase the volume and there is your mid control.