Katzenkonig hiss issues.

[Jouve]

Hi guys.
Yesterday i've built Princess Rawr PCB by Rullywow, which is Catalinbread Katzenkonig thingy . And overall it sounds very good, but the hiss is kinda annoying. Transistors are 2n3904 around 360 HFE. The most hiss I get is from Gain Knob.

Here is what I tried to do:
1. Decreased R5 from 10 k to 1 k. Was kinda helpfull to decrease hiss for the input knob.
2. Omited R8 (150Ohm)


After that i've installed a 20k trimpot instead of R10, and got quite nice sounding gated effect with no hiss by cranking gain knob. But using lower gain it still goes hissing.

So, maybe someone, has built it without these noise issues?

Best Regards,
Ivan

[Matt]

Small value caps between the base and collector of Q2 and or Q3 might help
10p might be a good starting point

[Betty Wont]

I've built a few of these. They are quite hissy, just like the rat.