Muff clipping - mosfet versus silicon

[SprinkleSpraycan]

I've been tinkering with big muff circuitry just for the fun of learning how it all works. Right now I'm trying different clipping options. I read that I can tie the drain and gate of a mosfet and it should be smoother than a silicone diode. I'm using bs170 MOSFETs and comparing them to 1n4148. I don't think I hear a difference. Is it that subtle or am I perhaps doing it wrong?
As you can see I have leads run up from the first gain stage clipping to a bread board with the MOSFETs on it.

[idy]

How do you have them hooked up? The Gate is soldered to which? At the very least that makes a higher clipping threshold.
There is a configuration which sounds like(is) a silicon diode.

D and G together and the S separate, one direction its Si diode, the other its higher voltage.

[Fancy Lime]

If you don't hear a difference, you are probably using the body diodes, which are indeed perfectly normal Si diodes. This is the way that almost all commercial "MOSFET clippers" like the Fulltone OCD or Hermida Zendrive and MOSferatu use them. The difference to 1N4148 is extremely subtle and only audible under ideal listening conditions. It's just a marketing gimmick in commercial pedals. Using the MOSFETs "the other way round" as clippers is quite different, though.

[m4268588]

http://www.muzique.com/lab/zenmos.htm

[Mark Hammer]

When a signal is clipped TWICE, as it is in a BMP, I don't know how a person could hear any difference other than level.  Not to disparage use of MosFets, but it's simply not the context to detect nuance.

[SprinkleSpraycan]

Thanks for the input. Probably isn't the place for MOSFETs. I'm going to start working on a king of tone. Perhaps I'll try the MOSFETs there.

[iainpunk]

Thanks for the input. Probably isn't the place for MOSFETs. I'm going to start working on a king of tone. Perhaps I'll try the MOSFETs there.

if you use a single mosfet, it does asymmetric clipping in a very nice way!

cheers