How to use a fuzz face calculator

[spi]

I see a bunch of online tools where you punch in some resistor values and specs for your transistor, and it spits out a bunch of voltage and current values.
example: Fuzz Face Calculator (muzique.com)

I'm not quite sure how to use this. Am I supposed to tweak R values until I find a set of voltages and current that look good? And if so, what am I looking for?

 

[Big Monk]

IIRC, those calculators are not very accurate.

 

[andare]

Breadboard the FF and pop the trannies in. Measure the voltage on Q2c first and tweak the 33k resistor until you get around -0.7V (Ge) or 1.3V (Si).
Then do the same for Q2c and the 8.2k. Shoot for -4.5V for Ge and 5.5V for Si. Adjust this value to taste.
Maybe use trimpots for both resistors and then measure them and use the closest value resistors you have.

Look up Gray Bench Electronics on YouTube. Joe made a video where he does exactly that. It's perfect.

 

[T-Go]

Breadboard the FF and pop the trannies in. Measure the voltage on Q2c first and tweak the 33k resistor until you get around -0.7V (Ge) or 1.3V (Si).
Then do the same for Q2c and the 8.2k. Shoot for -4.5V for Ge and 5.5V for Si. Adjust this value to taste.
Maybe use trimpots for both resistors and then measure them and use the closest value resistors you have.

Look up Gray Bench Electronics on YouTube. Joe made a video where he does exactly that. It's perfect.

I know this is an old thread, but I was trying find similar info and found your input helpful, so thank you! I believe this is the video you referenced for anyone interested.