Guma Drive - Overdrive kit

Item number: 1707

Bass overdrive.

Category: Schalltechnik_04


starting from 38,50 €

Final price incl. VAT, plus shipping (mitttel)

Available now!

Shipping time: 3-7 Working days


The Guma Overdrive is based on the famous overdrive made by an finnish company.

This kit is a creation by Schalltechnik_04 in cooperation with If you have any problem with the content of the kits like mising or wrong parts, please contact Musikding (Klaus) at For any technical problem relating to building this project, please contact Julian. You can get him here:

Here´s the parts list: Parts List (BOM)

This kit contains all parts you need to build a fully functional effect pedal. Not included in the kit, but also good to have:

  • 9V DC power supply
  • 3 knobs for smooth 6.3mm shaft
  • Decal, transfer or transparent sheets for labeling
  • Documents: Guma docs.

    Instrument: Bass
    Effect-Type: Distortion Overdrive

    Ratings (11)

    Average product review

    4 Stars
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    Total entries: 4
    5 from 5 Great sounding Overdrive

    This is great sounding overdrive for bass guitar. I dont own B3k Microtubes so I have nothing to say about comparision but sound of this kit suits my requirements. Very nice and warm overdrive can be more agressive using Attack switch. You can mix your bass native sound with overdrive thanks to blend knob so sound spectrum is not as narrow as in other overdrive effects. This is my second kit of Guma Drive (first was for my friend).

    Soldering is quite simple thanks to detailed instruction with step by step walk through.
    The only disadventage is about Grunt switch - when it is set to Fat sound, you can hear more hum. I have enough grunt from my bass guitar so no need to increase it.

    ., 08.03.2018
    5 from 5 Really nice kit. Sound is great.

    This overdrive sounds wonderfull. Very powerfull, clean, flexible... You can get lots of different sounds from ligth overdrive to even pretty distorted sounds, but always warm. The kits was easy to assemble and worked perfectly fine.

    ., 07.05.2018
    5 from 5 Nice bass overdrive

    El clon está muy conseguido. Es muy versatil y es practicamente un b3k. Hacer todo el kit puede suponer un dolor de cabeza, pero siguiendo los pasos no tendrás problema. Se necesita experiencia en soldadura para poder montar bien el kit, hay pistas muy juntas. Soldar los JFET no es facil.

    ., 04.06.2018
    5 from 5 Great overdrive, great kit!

    Its taken me a couple of years to finish the build: most effort went into learning to spray paint the case. The kit is really nicely put together and the thought and effort contributed to a low-stress build. I had an error with one component which was replaced quickly and without fuss.
    Im no connoisseur of overdrive sounds, but this unit delivered when I first plugged it in, and it sounds every bit as Id expected.
    The PCB is densely populated, and the build needs some thought and care in construction - check out the SchallTechnik instructions (I followed them step by step).
    I love that the kit had a bag of pre-cut hookup wire. Classy!

    ., 28.02.2022
    Total entries: 4

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