Help with Fuzz circuit Bias

[sonolink]

I've breadboarded the classic NPN Fuzz Face circuit and it sounds great although a bit limited for my taste. So after reading the articles on Fuzz Central about several mods I began by replacing Q2 collector resistor with a 10k pot. The pot is a great add-on but I feel that half of the range of the pot is useless. All the changes, from sputtery to fully open happen in a very short portion of the turn of the pot, if you know what I mean.
I tried with other values, basically what I had at hand (25k, 50k and 100k) but it's pretty much the same. Am I guessing right if I think that I should lower the resistance of the pot to be able to use the whole turn or should I combine the pot with another fixed resistor?
Any help/ideas are very welcome, thanks

The classic FF NPN circuit:



The modded FF circuit:

 

[JohnRoberts]

When making distortion on purpose for an effect, the rules are "there are no rules".

Experiment and do what sounds good to you.

JR

 

[sonolink]

Hey John,
Thanks for your reply. That's exactly what I'm trying to do
But I'm asking for help to exploit the full turn of a pot. I must be doing something wrong or not understanding how it works, hence some ideas/advice on that would be great

Cheers
Sono

 

[CJ]

Try a 1 K resistor under that pot.

 

[sonolink]

Try a 1 K resistor under that pot

Thanks CJ. I'll give it a shot
Cheers

 

[ccaudle]

All the changes, from sputtery to fully open happen in a very short portion of the turn of the pot

Linear or logarithmic taper? You could try the opposite taper of whatever you are currently using to see if it gives a more usable adjustment range.
You may also need to connect a series resistor to the pot so that you have a minimum resistance and can't get all the way to 0 collector resistance.

 

[heatwalk]

5k pot and 5.6k resistor gives you a good range above and below the normal value

 

[sonolink]

Linear or logarithmic taper? You could try the opposite taper of whatever you are currently using to see if it gives a more usable adjustment range.
You may also need to connect a series resistor to the pot so that you have a minimum resistance and can't get all the way to 0 collector resistance.

I'm using linear. I'll try a resistor in series beginning with 1K and see what it gives.

Thanks!
Sono