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So, there was nothing wrong with my soldering. At least not totally.
I found the solution in a YouTube video of an assembly of the same pedal, where the guy pointed (no talking) at the trim pot marked C1K as the contour knob. I used the C1K for fuzz...

I would have wanted this information in the kit's description:
B1K: 1 kOhm rev log
C1K: 1 kOhm lin

Maybe I should have understood which one was going where, but I didn't, and there were nothing explaining that to me.
I based my choice on the description of the potentiometer in the web shop, which says "rev log C":
https://www.musikding.de/Alpha-Potentiometer-16mm-1k-rev-log_1

So now I measure 4.7 V on Q2c, which I'm quite happy with for now.

Thank you for your replies!

Aaaaand he's back! 

This is just weird. After having left the pedal for a while (off) I fired away with the measuring again, and now I got around 8V on Q2c. And the voltage is dropping, ever so slowly. About -0.1V in 15 minutes.

Is this just more evidence of bad solder joints?

Hello again...

So I started scratching the PCB where the solder joints were close, and now I get around 5.4V on Q2 collector. And now the voltage changes when I adjust the trim pot. Progress, but it still sounds crappy.

I noticed that the 10K RV1 (trim pot) on max actually only measures around 7K ohm. So, would a 20K on RV1 perhaps get me to the magic 4.5V?

Did another measure now, and I don't know where that prior reading of 7.69 volts went. Now I'm getting these values:

10K trim pot only differs 0.06V at max. Sounds very low to me.
Q2-collector: 9.21V
Q2-base: 0.33V
Q2-emitter: 0.34V

Have not yet done any reflowing of solder joints. I'm guessing I would start by just reflowing Q2, or should I reflow everything on the PCB? 

OK, wow... After measuring it sounds even worse. Before it was usable to some extent. Now it's just crap. 

Here's a video clip of what it sounds like now:
https://youtu.be/V7V5lKlDkqk

OK, so now I have checked the resistors placements and color codes, and they are OK.
I'm reading 7.69 V on the Q2 collector, which would explain (?) the over saturated sound I guess.
Unfortunately the voltage doesn't change when I change the value of the 10K trim pot or the bias knob.
I have measured a difference in resistance in the trim pot itself, so it appears to be working.
The soldering looks OK I think (for a beginner). But if something would be wrong with it, there would be no sound at all right?

I do have a multimeter but I did not bias the transistors, simply because that wasn't mentioned in the kit's description. You live and learn.
But I'll try that as well this weekend then.

Thanks for the suggestions!

Hello pedal heads!

So I recently built my first pedal, a Fuzz Face 69 clone from musikding.de.
Schematics: https://www.musikding.de/docs/musikding/face69/69erschalt.pdf

The kit's Ge transistors are AC125 and AC125U, supposedly with 80-89 and 110-119 hFE values.

I was happy to see it worked right away, but not very impressed by the sound. Unless I have the fuzz knob set very low it is overly saturated. And when set it low the sound is quite boring.

I have tried switching the transistors, since I didn't take note of which one had which hFE value, and also tweaked the trim pot, but to no apparent avail.

Could the transistors be bad, or have I perhaps done something wrong?

Maybe easier to understand with some audio, so I'll try recording a clip this weekend.

(I'm using a Gibson LP Studio 2004)