Solid State Guitar Amp Forum | DIY Guitar Amplifiers
Solid State Amplifiers => Preamps and Effects => Topic started by: manis404 on April 12, 2009, 02:16:17 PM
Hi everyone.
Basically, the title says it all; I need something really simple to drive my 2x100W STK 412-030 SS monster. 8) I've looked around pretty everywhere and bookmarked a few designs. But I wanna knw the opinion of you guys on this..
I'd like to point out that I do not need any distortion(or any other effects) in my preamp. It should sound as cleanest possible...I plan to drive it mainly with a Boss MT-2(cloned..hehe). In fact, its main purpose is to match the impedance of my guitar to that of the amp[input impedance 55k].
The closest match to what I need is the "Fender Blackface" preamp(fet version). Does anybody has a pcb/perfboard/verroboard layout?
Or can anyone suggest anything better suited to my scenario..?
Thanks.
manis404
Hi. If you want clean, stay away from those *very* poor "designs" that mimic classic tube circuits but power them with 9V and need a trimmer "bias" pot for every fet. Ugh! Fenderish, simple and clean is Rod Elliot´s Guitar Preamp. Go for it; it´s perfect for what you want.
You could try something like this:
I haven't built it yet but simulations I've run in spice look promising. The tone control doesn't have the characteristic FMV "notch" but rather is dead-flat at the middle position and gives a very wide range of adjustment and substantial boost/cut to the high or low end when adjusted accordingly.
Modify the circuit to run from a +/- 15V supply if you want the cleanest possible option. As it's drawn now there's DC across the gain cap so it may be scratchy.
I am building a small amp and found that these two circuits combined make a really nice clean preamp.
Don Tillman pre amp - http://www.till.com/articles/GuitarPreamp/index.html
into a LM386 amp I found here http://www.elecfree.com/electronic/simple-lm386-audio-amplifier/
leave out the gain cap in that second link to keep it clean. You can also try skipping the first circuit and see what you think. I know this works really good for the power amp I made, but I don't know for sure how it will sound with yours.
You can see the project I'm using it for in this thread
http://www.ssguitar.com/index.php?topic=1143.0
These are really easy to put together on a breadboard, so give it a try and see what you think.