Dr. Boogie mid pot mystery

[Subzero]

Hello.

I just finished building my Dr. Boogie, using gaussmarkov's layout, and everything seems to work just fine. The only thing that refuses to work no matter what, is the 5k mid pot. I have checked the wiring 20 times, I replaced several pots, but nothing seems to help. The weird thing is that everything else, including the other pots, works.
Does any one have any idea where should start looking or what could be causing this thing. I'm pretty new to this and any help would be greatly appreciated

Thnx

[ubersam]

The only thing that refuses to work no matter what, is the 5k mid pot.

The mid pot is supposed to be 2.5K, but still, the 5K pot should affects the mids as it is turned. double check the value of C12, it should be 0.22uF (220nF). other than that, double check the solder joints, particularly around C12 and the pad for the wire that goes to pin 2 of the mid pot and the solder joint of the wire and pin 2 of the mid pot (check the trace between C12 and that pad as well).

[Subzero]

You were spot on ... it was indeed C12, I don't know why but I got it wrong  ...
Thank you so much. 
Now that this thing's working I have to say it sounds pretty decent, but the Bass and Mid are not vary responsive. What can I do to increase the bass response with the original tone stack, and maybe increase the mid pot's range ?

[ubersam]

glad you got that one sorted.

It has been a while since I had my Dr. Boogie, but I remember the tone controls having adequate response. The DRB tone stack is a modified Marshall style passive tone stack, passive as in all cut and no boost, unlike an eq. It behaves very much like the controls you'd find on an amp, where turning one knob slightly affects the response of the others. Download the Duncan tone stack calculator to see how the controls behave: http://www.duncanamps.com/tsc/download.html - Then, play around with the values to find a response that you like and try it in your circuit. Another idea would be to change the tone control section with a BMP style control like this one: http://i112.photobucket.com/albums/n188/ubersam/schematics/Modded_BMP.gif.