Adding A Tone Stack To A Preamp Schematic...

[AG...]

So I have this here 'high gain preamp' schematic;

And I was wondering if I could add this tone stack design to it, and would it be a case of just sticking it on the back end of the scematic, like on the output part?

http://amps.zugster.net/images/articles/to.../fmv-layout.gif

If it's not as simple as that, or would work better before the gain stage, could one of you fellas gimme some direction on how to incorperate it?

[JoeAArthur]

So I have this here 'high gain preamp' schematic;

And I was wondering if I could add this tone stack design to it, and would it be a case of just sticking it on the back end of the scematic, like on the output part?

http://amps.zugster.net/images/articles/to.../fmv-layout.gif

If it's not as simple as that, or would work better before the gain stage, could one of you fellas gimme some direction on how to incorperate it?

You could replace C2 with the tone network. Since the values for the tone network aren't given, you might have to scale them from either the Fender / Marshall / et al values. The output impedance from the preamp appears to be much lower than what you would have in an amp.

[AG...]

Sorry, should have included the schematic, which has the values on it.

http://amps.zugster.net/images/articles/to...s/fmv-schem.gif

I was planning on putting this in a pedal form, not to be used as a stand alone preamp, as a kinda boost type thing.

[JoeAArthur]

Sorry, should have included the schematic, which has the values on it.

http://amps.zugster.net/images/articles/to...s/fmv-schem.gif

I was planning on putting this in a pedal form, not to be used as a stand alone preamp, as a kinda boost type thing.

In that schem... the values of C2 and C3 are flipped. It looks like you might have copied them from Duncan's TCS - at least at one time he had them backwards. The current version has them corrected. You might want to download it to help experimentation with values.

The tone control network is going to have some insertion loss. You might be able to make it up with the preamp's gain. Since you are planning on using it as a pedal, there is the option of sticking a volume control after the treble control output... and then adding another gain stage for recovery and buffering the output to the amp.

[AG...]

Cheers for your help, I'm not completely sure how everything works, but I'll have a play about and see what happens, I learn better that way.