aion UBE SCREAMER Handbuch - Seite 2

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1 Project Overview

2 Introduction & Usage

INTRODUCTION

The

UBE Screamer

from Runoffgroove was originally developed as an experiment to see if something

tonally similar to the

CMOS hex inverters function somewhat similar to op-amps, albeit with much lower open-loop gain and

much different clipping characteristics. Craig Anderton's famous

Way Huge Red Llama is based on) also used hex inverters, as well as the

from 1979 and many other derivatives since that time.

Circuit-wise, the UBE Screamer has little in common with the Tube Screamer it's named for, but it

succeeds in occupying a similar space in the tonal spectrum and is well worth your time to build it.

The Aion FX implementation of the UBE adds two modifications: a clipping diode switch and a second

switch to change out the global feedback resistor. The original Runoffgroove article recommends

selecting this resistor for based on whether you'll be using single coil pickups or humbuckers, so we

took the step of putting it on a switch so the pedal can be used in any scenario without heating up the

soldering iron.

USAGE

The UBE Screamer has three knobs:

• Drive controls the amount of gain going into the feedback-clipping stage.

• Tone controls the treble response of the effect, cutting frequencies at 3dB/octave with a variable

cutoff frequency of between 1kHz and 10kHz.

• Volume controls the overall output of the effect.

In addition, there are two switch modifications included for added flexibility:

• Clipping selects between 2 diodes or 4 diodes in the feedback clipping stage.

• Frequency sets the mixing ratio of the clean path, which impacts the EQ or fullness of the overall

effect. Three options are available, with the down position being better suited for single-coil guitars

and the middle position being better for humbuckers. The top position is somewhere in between.

RUNOFFGROOVE UBE SCREAMER

Ibanez Tube Screamer

could be created with a series of CMOS hex-inverter stages.

Tube Sound Fuzz circuit

Electro-Harmonix Hot Tubes

(which the

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