Darkside hiss problem

[josetxu]

Hi everybody,

I've just finished my Darkside (must be one of the last madbean's PCB before he discontinued them). I've used the stock values (panasonic capacitors, xicon metal film resistors), BC549 transistors, 1N60P for D1&D2 and BAT41 for D3&D4. First I tried 1N60p for all the diodes but I found this combination gives me a little more bite. It sounds good at full guitar volume (I don't like very much when you roll it back) but I've found that if I pass SUS beyond 2 o'clock it starts to make a loud hiss noise. I'm a bit lost, I don't know where to start, bypassed it's dead silent (and below 2 o'clock).

Any ideas?

Thanks in advance!