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- Newsgroups: alt.guitar
- Path: sparky!uunet!cs.utexas.edu!torn!csd.unb.ca!UNBVM1.CSD.UNB.CA
- From: META <META@UNB.CA>
- Subject: Re: MOSFET distortion
- Message-ID: <21JAN93.19396363.0067@UNBVM1.CSD.UNB.CA>
- Lines: 30
- Sender: usenet@UNB.CA
- Organization: The University of New Brunswick
- References: <1993Jan19.053551.21436@leland.Stanford.EDU>,<TILL.93Jan19105733@acid-rain.lucid.com> <1993Jan19.210942.27341@ultb.isc.rit.edu>
- Date: Thu, 21 Jan 1993 21:57:34 GMT
-
- In article <1993Jan19.210942.27341@ultb.isc.rit.edu> whc2993@ritvax.isc.rit.edu writes:
- >>I've built JFET preamp stages that match a 12AX7's transfer characteristics
- >>to within around 1% or so. And Craig Anderton's "Tube Fuzz" project in
- >>fact uses the complementary MOSFETs in a CMOS inverter to get a tube power
- >>amp distortion. So yeah, it works.
- >
- >Is the Craig Anderton's "Tube Fuzz" project from a book or magazine?
- > Bill
- >
- The circuit can be found in Craig's book "Electronic Projects for
- Musicians" (2nd edition). It uses a single 4049 hex inverter chip
- and is remarkably simple to build. I've been using a variant of
- that circuit for some time and like it a lot. I might point out
- that the onein EPFM is, IMHO, inferior sounding to a cirrcuit Craig
- had in GP some time back in 76 or 77, also using a 4049.
-
- Personally, I prefer to stick an op-amp gain stage ahead of the
- 4049. For whatever reasons, the 4049 seems to distort more sweetly
- if it is being called on to field a large-amplitude signal, as
- opposed to creating one. So, instead of using the 1-10meg resistors
- that Craig sticks in the feedback loop, I use 100k and 220pf caps to
- take out the top end, and stick a x20 gain stage ahead of that. Gives
- a very soulful dirty sound.
-
- The EPFM book can be had from a variety of sourrces, but I recommend
- getting Stewart-MacDonalds' Guitar Shop Supply Catalog, and
- orderring from them. (ohmygOD! wAS THAT A COMMERCIAL ENDORSEMENT?)
-
- Mark Hammer
-
-