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Forum Home > Layout Gallery - GuitarPCB Build Documents, Mods and Tips > Bass Overdriver

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Bassists need dirt too!

No one, until now, has offered something that works, with all the full, rich bottom-end that you need, while dialing up big vintage tube tones, bright modern slap sounds, gnarly distortions, and all in between.


The Bass Overdriver is voiced using three stages, of easy to bias, FET transistors. Each stage has a carefully selected capacitor giving a natural, uncolored FATNESS to your tone.


By just adding a little grind, or replicating a raging SVT, you can sound like Chris Squire of Yes, to Jack Bruce in Cream, a little Grand Funk, or anything in between!

All of this is accomplished using only two simple (board mounted) controls.

Volume and Gain!

Why make it hard? Let you amps tone controls, or Bass Eq, do the tweaking!

Then enhance it for all it worth with the new Bass Overdriver from GuitarPCB

Bass Overdriver Build Documents

Biasing is mandatory to make this circuit sound correct.


Note: If you have trouble Biasing down to the correct Voltage you may substitute the 1k Resistor working from Q1 to Q3 with a simple jumper as needed. You may only have to do this once, starting with Q1 bias resistor which is R3. R6, and R9 would be next in line if needed.


Transistors are not all created equal so this is a solution to solve a problem if you cannot get your drain leg bias down below 6v.

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Welcome to my informational signature:

See our Home Page for all Guides!

Check the Layout Gallery section of the Forum and find your project before building.

Pre-Build Reading Guides:  Crash Course#1 , Crash Course#2 & Tips, Tricks and Tutorials.

Troubleshoot threads must have pictures and voltages.

All builds are 100% verified. Be sure to use Genuine Transistors and IC's

Any serious builder should have an Audio Probe to diagnose problems quickly.

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July 29, 2014 at 5:45 PM Flag Quote & Reply

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