Silicon Fuzz Face - White noise, exceptionally hearable with gain all the way up

[rybelke]

Hello, everyone!

So I've decided to switch from BC109c to BC108c in my fuzz face builds. Now, with my new transisors all soldered (CDIL brand), a white noise is present all the time, and gets really loud when I turn the "fuzz" (gain, if you wish) knob all the way up.

Here's a (poor) sample:
https://clyp.it/rlbeqxgc
In the sample, all I do is turning the fuzz knob. Changing the volume pot's value doesn't affect the noise.

I used this schematics:
http://fuzzcentral.ssguitar.com/fuzzface/fuzzfacenpnschematic.gif
with a 200pF cap added between the Base and Collector of the Q1, which seemed to get rid of the oscillation I had to deal with in my previous (BC109c) builds.
What can I do to get rid of this noise, with no effect on the gain?

[Cozybuilder]

That sounds suspiciously like 60Hz. Is this boxed? Is it powered by battery or a wall wort? You might try a low-pass filter for your 9V source (47R then 100uF to ground).

[rybelke]

It's not completely boxed, as the enclosure isn't ready yet. To check if it's about the shielding I've grounded the circuit to the non-drilled enclosure and put it inside without closing it completely - nothing seems to change. I might try the filter, the noise is so loud at the high end of the pot's range I highly doubt this will help.

[smallbearelec]

This kind of problem is typical with high-gain silicon in the FF. Try adding a small snubbing cap (100 to 300 pf.) between Q2 B and C as well. You might also put a socket in place of Q2 and try a different device.