Tube Sound Electric Guitar Effects


This article will help you to build yourself a Guitar pedal, that sounds like SansAmp GT2 and Behringer GDI 21.
The project is easy to build at home and will add a new impressive sound to your instrument.
In short, with this device you get:

- simple and low cost design, compact and lightweight device.
- 4 different basic settings (clean, clean+tube sound, distortion, distortion+tube sound), changed with a single push-button.
- low noise and natural distortion.
- low consumption, can be powered by a 9V battery.
- low output impedance, can directly drive earphones.

guitar_effects_case guitar_effects_pcb guitar_effects_circuit

Here you can hear recorded samples from the pedal.


The tube sound of a guitar amp has become almost mythical for musicians. The soft and natural distortion of tubes, combined with an output audio transformer, is the reason that any player with a sensitive ear is ready to spend big money on such equipment. For DIY projects it is best to use, what is called, a cabinet or speaker emulator.

Analyzing the output of a real tube amp, you will find that in contrast with the linear transistor one, it has peak at bass frequencies, a through at 1kHz and second peak above 4kHz.

tube_sound_cabinet_guitar_emulator
Tube sound (cabinet) output.
transistor_sound
Transistor sound output.