Fairfield ~900 Fuzz (About 900)

[Ale_jellybelly]

~900

And when things are combined, is anything lost? And when something is lost, will there ever be more?But what is the gain?The ~900 is a ferocious fuzz pedal featuring two cascading JFET gain stages. Tracing its lineage back to our discontinued Four Eyes Fuzz, it offers a very wide range of gain...

fairfieldcircuitry.com

Sounds quite different from the Unpleasant Surprise but with quite a wide range of interesting sounds

I haven't been able to find a schematic online

 

[Harry Klippton]

Anybody else see jfets and think "hmm yeah nevermind. Maybe not" Just me?

 

[Fama]

Anybody else see jfets and think "hmm yeah nevermind. Maybe not" Just me?

It feels like more could go wrong with JFETs compared to BJTs or opamps, but I like how they sound.

 

[HamishR]

Yeah although for me it's not so much JFETs in general but J201s in particular. Maybe I have some excellent 2N5952s, J113s, 2N5457s etc, but I rarely have any problems with those. But J201s are needy. And I have bags of genuine J201s which get little love. When you can get them dialled in just right they can sound spectacular, but it does put me off going to the effort of building anything with them. It's a shame because there are some fantastic sounding Menatone circuits which are 100% J201. One day when I'm feeling brave I will build myself another Menatone King of the Britains...

 

[benny_profane]

Yeah although for me it's not so much JFETs in general but J201s in particular. Maybe I have some excellent 2N5952s, J113s, 2N5457s etc, but I rarely have any problems with those. But J201s are needy.

That strikes me as a bit odd since the J201 is spec’d with a much tighter Vp than the 2n5457.

 

[HamishR]

It could well be, but I've rarely had issues with just whacking 2N5457s in a circuit and having them work every time. J201s, however, seem to always need biasing whenever I use them. It's just how it's worked put for me.

 

[Ale_jellybelly]

Can't see much from here but here's the guts from the Fairfield website

 

[Feral Feline]

Maybe the Fairfield FOUR EYES should be in the wish list, too, especially since it's discontinued...

 

[Locrian99]

guessing from the writing they probably measure the jfets (guessing 201’s) and have resistor ranges already measured out for biasing? Seems like a trim pot would be easier just not sure why else they need to put the measurement there. I will however upvote this it just sounds wonderfully broken.

 

[Ale_jellybelly]

Maybe the Fairfield FOUR EYES should be in the wish list, too, especially since it's discontinued...

looks like there's a lot going on in the Four Eyes but could be VERY interesting to build:

 

[HamishR]

I think the problem you are having is because you left R9 off.

Sorry - thought this was the troubleshooting page...

 

[benny_profane]

looks like there's a lot going on in the Four Eyes but could be VERY interesting to build:

Make a new thread for this one.

 

[Ale_jellybelly]

Make a new thread for this one.

I will!
but to the people "liking" the first post, also upvote this one

 

[jwyles90]

Upvoted! I just put together the Desolate Fuzz, so having this to go along with it would be awesome.

 

[sticky1138]

Just discovered this on YouTube and then found it here in the wishlist. It has my vote!

 

[fontoponto]

Maybe the Fairfield FOUR EYES should be in the wish list, too, especially since it's discontinued...

it was mentioned on fsb by it’s creator that it has four layers