Tone Tool
Blue Soul
Tone Tool is a Dumble JFET input and Echoplex preamp topology inspired circuit.
Blue Soul is a tool for blues to classic rock tone lovers that goes from treble boost to dirty fuzzy drive.

Tone Tool
With the passive treble and bass cut controls, it can take the role of a clean boost push with TS9 or Klon flavored middle frequencies. Three preset amp sound characters on an external switch. There is a reason why the previously mentioned circuits became so popular. They are awesome single JFET transistor gain stage musical tools. But I believe even these can be improved to fit the today's modern musicians needs. In my opinion a passive bass cut before and a treble cut after the amplification stage can open a whole plethora of new tone nuances. To push further the possibilities, if we study the biasing of the first gain stage in a tube amp, we can see that it is very similar to what is happening in these JFET circuits. Let's implement these by putting them on a switch, so we can have two of the most known amp sound characters available and taking the flexibility range even further. In a short story that's what the Tone Tool is. A JFET based amplification stage simulating the input of a tube amp, followed by a JFET buffer to accommodate the circuit with the pedals or amps that would follow it. I hope you will enjoy it as much as I enjoyed every little thing, I have added to it, and listening to it over and over on how it grows into what I consider that is now ready for everyone to work with it.

o Controls
Simple and self-explanatory, so I will rather give you a few visual examples of what I hear turning the knobs. To be mentioned, that both the Bass and Treble control act as gain of the overall amplification. Balance it with the Volume. Please see the Tone Settings I can recommend in the photos on the next page.

o Switch
US - Low mids are the predominant here with just the right amount of highs. The "big clean sound" character specific to American made amplifiers. This is the louder the better tone. Push a breaking up amp with it and you have a new channel on your amp. Try it with single coils.
- Infinity is having the most neutral tone coloration with a warmer sound and the least amount of gain. Start from everything at noon for clean boost. Go up with the volume for more power, cut from bass and treble for a good detox of your tone. Leave just what you need to achieve the tone in your head. Try stacking it after your dirt pedals.
UK - Cut through chime sound with the abundance of upper mids. It has the most presence focused tone with the tightest bass of the three options. Even when you are cutting all the treble and bass, pushing up the volume it makes a perfect rock to metal boost. Try it with humbucker coils.

o Secret Controls
If the above are not enough for your tone thirst, there are two micro switches inside. One is for boosting the bass as I am a bass player and I use it with this set to ON, and one is for cutting the highs, I have a TT unit set like this when I play boosting a high gain guitar amp. Please see the combination examples I have made for you in the photos.
From the little trimmer potentiometer, you can set the minimum level of the Volume knob or set it to 0 when pedal engaged. I always ship it with this set to maximum. When you have the Character switch set to Infinity, the microswitch to Modern, Treble and Bass to maximum and Volume to minimum the pedal should be at the same level as bypassed and act as a buffer.
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Blue Soul
Raw and biting, uncompressed simple pushing force. Easy to understand controls to set and forget, just switch it on and control the rest from your instrument. Based on old 70's topology but every component is different. I did not invent the transistor amplification nor the diode clipping and so is with this circuit. Started out from something like an Astrotone / Sam Ash Fuzz, stripped down to an Electra Distortion, when I realized that this is actually similar to the dirt engine of the obscure Ibanez No.83 Fuzz and Double Sound Fuzz Wah. I've built it up again by giving it an input blend between Rangemaster and Bazz Fuss and a tube amp inspired channel blend bias to be useful to me. If it's the same to you, well I'm glad and honored.

o Controls
For first the Gain is the Volume knob of your instrument! You will love how much control you can have without even thinking to switch off the pedal.
There is. This is actually the potentiometer you can adjust the output volume level of the pedal.
Clockwise blends in bass for saturation to the fuzz sounds and body for the boost and overdrive settings. Counterclockwise cuts the bass to accommodate humbuckers and prevent boominess when boosting the amp.
In the middle it has the least gain. Counterclockwise accentuates high frequency gain. This is where the treble boosted overdrive is for those Glassy blues licks. Clockwise ads the most gain for low end saturation and pushes the sound into the Fuzzy territory. Imagine like blending a bright and a bass channel on an amp. The plethora of sounds you can achieve here with a little modification is probably what inspired so many versions of the Electra circuit to be put out and sold by some pedal makers. Well... You have it all on one knob.

o Switch
Si - My favorite electronics store sale out treasure find silicon mojo diodes from the 60's in symmetric configuration. I will let the users decide what clipping character they hear. For me, these are the best sounding diodes with the most natural saturation and cleanup I've ever heard, and I'm an addicted collector of diodes.

0 - No diode clipping. Be aware that the pedal will be much louder in this position. A good amount of push with glassy highs or just transparent boost or slightly bass heavy sag, depending on what you set from the controls. Set the Range on glass and go nuts with the Texas blues licks.

Ge - Germanium diode added for creamy compressed character in asymmetrical clipping with a higher headroom less compression led diode, inspired by Marshall amps. It will be not as dirty as the silicon, instead it has that old-school burning tube sound that some would characterize as natural tube sag.

So, there you have it. My own challenge to have an old school sounding treble or full boost, overdrive, fuzz, distortion with Germanium and Silicon sound, out of one single amplifying stage, without any biasing issues from temperature and happily accepting daisy chaining with any other pedals.
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  • Please power the pedal with a proper 9VDC standard negative center, 5.5x2.1 plug power adapter, or 9V battery. DC voltage of more than 9V, or AC voltage will damage the circuit. Please be aware of this, as a faulty usage will void warranty.
    • Any kind of modification to the circuit or any type of physical damage made intentionally or by user negligence will void warranty.
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