I've been looking for some guitar preamp schematics with little success. I have 4 12AX7 tubes (3x Sylvania, 1x Wurlitzer) that I'd like to use. I'm looking for some good tube distortion, maybe similar to a Marshall. I'll be feeding a solid state amplifier from this, so of course it won't be the same.. but I want to get some of that crunchiness.
I've got a Fender Champ II which sounds good when overdriven, but I need a bit more.
I'm not looking for a lot of overall gain, I can always drop it back down after all the gain stages with a pair of resistors for a voltage divider.
Can I use two wallwarts back to back to get a high enough voltage? I don't know *anything* about designing tube amps (or solid state ones, for that matter).
I've got a Fender Champ II which sounds good when overdriven, but I need a bit more.
I'm not looking for a lot of overall gain, I can always drop it back down after all the gain stages with a pair of resistors for a voltage divider.
Can I use two wallwarts back to back to get a high enough voltage? I don't know *anything* about designing tube amps (or solid state ones, for that matter).
The McTubeII really overdrives very well, Has a very low parts count and is a fairly easy build. I built and own a couple !!
The McTube Site has a very comprehensive walk-thru on the build, And allows easy variations for modifications of original design. As near a perfect 1st project as I've ever seen.
I have another project that might be worth a shot but is as of yet untested, Basically it is roughly following the McTube mindset on its power source, This schematic goes a few steps further.
Roughly based on Seymour Duncan pre-amp modules*, Tone controls added & Drawn in indivual module stages for easy mods.
You can download it here classicpreamp
The originall idea was to build it for my brothers B-Day as an add-on to his solid state amp, I even went so far as to (ducking eggs and rotten tomatos) Make up the artwork for the printed circuit board.
Well, I set the project aside, And built him a 6AQ5A SE setup and just never got back to the project.
Hopefully I will find time to prototype it soon, then i can finalize & Debug the artwork and schematic.
NOTE, Not intended for beginners.
Gene
* note, there are about 9 interchangable modules with extremely effective tone and distortion/gain factors. Most of which are just value changes. Most can be modded on the same board.
Gene
The McTube Site has a very comprehensive walk-thru on the build, And allows easy variations for modifications of original design. As near a perfect 1st project as I've ever seen.
I have another project that might be worth a shot but is as of yet untested, Basically it is roughly following the McTube mindset on its power source, This schematic goes a few steps further.
Roughly based on Seymour Duncan pre-amp modules*, Tone controls added & Drawn in indivual module stages for easy mods.
You can download it here classicpreamp
The originall idea was to build it for my brothers B-Day as an add-on to his solid state amp, I even went so far as to (ducking eggs and rotten tomatos) Make up the artwork for the printed circuit board.
Well, I set the project aside, And built him a 6AQ5A SE setup and just never got back to the project.
Hopefully I will find time to prototype it soon, then i can finalize & Debug the artwork and schematic.
NOTE, Not intended for beginners.
Gene
* note, there are about 9 interchangable modules with extremely effective tone and distortion/gain factors. Most of which are just value changes. Most can be modded on the same board.
Gene
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