Noise problem

[Chrissie]

experimenting with a FuzzFace like circuit, but while testing I did encounter a weird problem:
When I play the fuzz, it produces a "normal" amount of hiss and noise.
When rolling back my guitar-volume, it acts like it's supposed to do.
However, as I back off the guitarvolume completely, a huge amount of noise and hiss appears and I also receive radio moscou.
This happens with every guitar I try.

Can someone shed light on what is possibly causing this noise?

Thx!

[R.G.]

Your fuzz face is going into RF oscillation when you roll the guitar back. Put a 0.01uF ceramic cap across the power supply. Post back if that doesn't work.

[Chrissie]

Unfortunately putting the cap across the power supply makes  no difference...

[R.G.]

OK, do the same (0.01uF, ceramic) from input to ground.

[Chrissie]

putting a cap across  the input seems to lower the radio signal a little, but the noise stays at the same level....

[R.G.]

OK, put a 1K in series before the cap to ground at the input, and a 100 to 1000uF cap across the 9V.