Revolution IV

Project overview

Modern high gain drive, that’s what the Revv G2, G3 & G4™ pedals are known for. This is your chance to build your own version of this insane preamp in a box. Accurate OpAmps emulations of the purple and the red channel from the Generator tube head.

There is no need to tell you how good this thing sound. You can find plenty of insane videos on YouTube if you do not know them yet. You will find why it has been chosen as the best pedal of 2018 by multiple specialized media after trying it.

Introduction

For this pedal, we can say that it’s an amazing conversion of the original Revv Generator Tube Amp, where you can see a pretty similar schematic to the ones present here. Is it possible to use the same principle of Tube-to-Jfet we have seen in many of the modern high gain pedals such as the Friedman Be-OD or our Wolfgang 5150.

As you can see, both pedals look very similar, not only by the controls but also by the components and the schematic; though they sound pretty different, they complement each other. In the words of Revv, “if the G3 is a scalpel, the G4 is a sledgehammer.”

The Revolution III it’s about clarity, punch, & precision. The Revolution IV is more about a thick, saturated distortion. However, when you try them tougher, you can see how good they blend; that’s why this pack includes for free an extra order switch, so you can place them both in the same enclosure as your own portable preamp and play it everywhere!

Going back to the circuit analysis, one of the most interesting things about is the 3-Band hybrid EQ. Composed by a Baxandall control for bass and treble, plus an active mid control after volume, it makes sure that you can dial this pedal in any way you want it, yet keeping on the definition you need on each frequency.

Both pedals feature an aggression switch that engages different settings of resistors and capacitors to change how the gain on the first stage behaves. Although you must notice that this pedal might squeal on with the aggression switch engage and the gain knob over 75%, we can assure you; you’d have plenty of gain by then.

This board has been designed to feature a special grill for the ground net to keep all the unwanted noises as low as possible.

Controls

• Gain
• Volume
• Bass
• Treble
• Mids
• Aggression Switch

For any technical questions regarding this build don’t forget to check out our Facebook Group and our forum at Free Stomp Boxes.

Revolution III&IV 1.1v – Building Docs

Revolution III&IV – Building Docs

Revolution Common – Drilling Template 125b