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pre-amp suggestions

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troublerat:
This is one thing that I may be able to give some suggestions on. If you need 9+9- go to http://www.geofex.com/ the circuit sweeping section and look for 9+9- from an 9 volt supply. Go to http://runoffgroove.com/doubled.html and use the jiggle side for an clean to overdriven fenderish type sound. Then theres my favorite  http://www.muzique.com/schem/projects.htm  the mosboost can be built from radio shack parts and gives an excellent fat clean boost [ you can use bs170, irf511, 2n7000]  Heres one chain to try it involves an boss comp. cs-3 with wampcats mods www.wamplerpedals.com   guitar/cs-3/mosboost/chip amp. I am probably going with the mosboost[one knob booster] [and the rog double d , just the jiggle side.and put the mos on an dpdt to switch it in and out in front of the jiggle. I am seriously pondering on the classic fuzz face circuit, I built one from the schem. at geofex with no variance from the schematic was very pleased with sound. Go to geofex at the top of the page "The tech of series".  Theres just to many good workable circuits  to bang my head and try to reinvent the wheel. All the above work well. I have use them in front of several amps. The hardest thing you have to do is deciding what kind of tone you want. I prefer the one or to knob types and try to keep the face of the amp from getting to cluttered with knobs.

edvard:

--- Quote from: troublerat on June 28, 2009, 12:55:55 PM ---This is one thing that I may be able to give some suggestions on. If you need 9+9- go to http://www.geofex.com/ the circuit sweeping section and look for 9+9- from an 9 volt supply. Go to http://runoffgroove.com/doubled.html and use the jiggle side for an clean to overdriven fenderish type sound. Then theres my favorite  http://www.muzique.com/schem/projects.htm  the mosboost can be built from radio shack parts and gives an excellent fat clean boost [ you can use bs170, irf511, 2n7000]  Heres one chain to try it involves an boss comp. cs-3 with wampcats mods www.wamplerpedals.com   guitar/cs-3/mosboost/chip amp. I am probably going with the mosboost[one knob booster] [and the rog double d , just the jiggle side.and put the mos on an dpdt to switch it in and out in front of the jiggle. I am seriously pondering on the classic fuzz face circuit, I built one from the schem. at geofex with no variance from the schematic was very pleased with sound. Go to geofex at the top of the page "The tech of series".  Theres just to many good workable circuits  to bang my head and try to reinvent the wheel. All the above work well. I have use them in front of several amps. The hardest thing you have to do is deciding what kind of tone you want. I prefer the one or to knob types and try to keep the face of the amp from getting to cluttered with knobs.

--- End quote ---

I love MOSFET preamps!  Here's two more for your grab bag:
- Use a CD4011 2-input NAND or CD4001 2-input NOR (unbuffered versions, of course) instead of a CD4049 for the "jiggle"; tie the two inputs of each gate together and wire each like an inverter. The internal structure shifts the bias point for asymmetrical clipping that sounds pretty darn good, and you don't have to worry about "throwing away" all those unused inverters in a 4049.
- Find a complement for the 2N7000 (BS250 probably) and wire the two together like the innards of an inverter.  It actually works, and again you don't have to worry about all those unused inverters, just build as many as you need!
Bonus: Same inverter-from-two-MOSFETs idea, only add another 2N7000 in parallel with the other one so you have a BS250 on top of two 2N7000s in parallel.  That shifts the bias point for asymmetrical clipping like the NAND/NOR gate.

Loudthud:
You can connect the MOSFETs in a CD4007U to be NAND and NOR gates. The 3 input NOR with a gain of about 2 is the most like a tube. Run the gates on 8 to 10V.

phatt:
Thanks , interesting. Q Will a 4007UBE work in this application?
Phil.

Loudthud:
That's the one. Jameco has 'em and has links to data sheets.

https://www.jameco.com/z/CD4007UBE-Major-Brands-IC-CD4007UBE-Dual-Complementary-Pair-Plus-Inverter-DIP-14_12597.html

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