(1 customer review)


A versatile overdrive pedal optimized for bass guitar, offering a range of crunch, distortion, boom, sizzle, and boost. Based on the classic DOD 250/MXR Distortion+ topology.

Out of stock

SKU: UOD1 Category: Tags: , ,


The Uncle 125 Bass Overdrive (or simply “The Uncle”) is Carcharias Effects’ boomier take on the classic op-amp gain topology—specially modified with bassists in mind. Its features and modes provide a wide range of tonal options, giving you everything from crunchy distortion, to subtle overdrive, to dirty boost.

With the clipping diode switch, you can select between Germanium diodes or LEDs. Guitarists and bassists alike can enjoy the sizzling overdrive of the Germanium diodes. The boomier, bassier, LED-driven overdrive gives the bass an undeniable presence, with crispy and brittle highs perfect for pick attacks. Turn up the gain (but beware of the output volume!) and take your bass to Russian muff-like overdrive territory.

The Blend knob allows you to control how much of the distorted Uncle signal is mixed in with your dry signal, letting bassists preserve their clean signal while dialing in the dirt (great for Germanium diode mode). The Uncle is also excellent in gain-stacking setups, e.g., into a Rat, or a Model T.

Each pedal in this first run of Uncles was entirely hand-made—so each one of them is unique! This means that each circuit board was soldered and tested, each enclosure hand-sanded, polished, and finished, and each bolt was meticulously fastened by one person in his home workshop, in his free time.



  • Optimized for bass frequency response
  • Blend knob mixes the distorted signal with the clean input signal
  • Clipping diode switch allows you to toggle Germanium and LED clipping diodes
  • True bypass
  • 100% Hand-made


  • GAIN – controls the amount of voltage gain going into the op-amp
  • VOLUME – output volume of the dirty signal
  • BLEND – controls the amount of dirty signal that is mixed with the clean signal
  • SWITCH – toggle between Germanium (left) and LED (right) clipping diode modes


  • Power: 9V DC, center negative. No battery compartment.
  • Consumption: less than 5mA


1 review for Uncle 125 Bass Overdrive

  1. WestyBassBob

    I bought mine used on a popular bass forum. What a great pedal for the price. You can spend a lot more for big name pedals that don’t even do what this one can.

    I keep looking at other pedals but I can’t seem to find one that will give me anything that this doesn’t.

    Well done sir!

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Return Policy

I gladly accept returns and exchanges.
Contact me within: 7 days of delivery
Ship items back within: 14 days of delivery

I do not accept cancellations on custom orders.
But please contact me if you have any problems with your order.

I cannot accept returns or exchanges for custom or personalized orders
unless the item arrives damaged or defective.

Conditions of Return:
Buyers are responsible for return shipping costs. If the item is not returned in its original condition, the buyer is responsible for any loss in value.

Shipping Information

Processing Time:
Depending on availability, the time I need to prepare an order for shipping varies. For custom builds, please allow 3-4 weeks lead time. For finished builds, please allow 1-2 weeks for processing.

Estimated Shipping Times:
Eco Post: 7–5 business days estimated distribution time for most destinations (see below), 10–12 business days estimated distribution time to Australia and Hong Kong.
Registered Mail: 4–8 weeks
I will do my best to meet these shipping estimates, but cannot guarantee them. Actual delivery time will depend on the shipping method you choose.

*** UPDATE***
Postal systems around the world appear to still be adapting to the global impact of COVID-19. This means that shipping times may be longer than we had previously been used to. I ask that you please be patient while we track the status of your package together.

Shipping Methods:
I ship out all pedal orders via Eco Post. This method is typically quicker than Registered Mail (advertised estimation is 7–5 business days, but due to the current situation has been known to take a bit longer, depending on the country), and it also features computerized tracking and proof of delivery.
This method is available in the following countries: Austria, Australia, Italy, Ireland, the United States, Belgium, Brazil, the United Kingdom, Germany, Denmark, South Korea, the Netherlands, Hong Kong, Greece, Japan, Norway, Spain, Poland, Portugal, Finland, France, Canada , Sweden, Switzerland, Thailand, Russia.

For PCB orders, you can choose between Eco Post and Registered Mail.

Customers living in Israel can arrange for Local pickup, just contact me for arrangements.

Customs and Import Taxes:
Buyers are responsible for any customs and import taxes that may apply. I am not responsible for delays due to customs.


Each Carcharias Effects pedal is hand-made by one person in his home workshop who loves making music, and making things that make music. Every purchase you make enables me to continue making more pedals, so your support is very much appreciated. That said, I take responsibility for the build quality of every pedal I make comes, and offer a 24-month warranty on each one, not covering normal wear-and-tear or abuse.

All the PCBs that I sell on this site were designed personally by me, but the fabrication is outsourced to third-party PCB fabrication services. Once they are designed, I order them in relatively small batches. I personally test every batch that I receive; however, as I am a strong believer in minimizing waste, there are cases in which I may sell perfectly functioning PCBs that might have some design flaw. I take responsibility for these design flaws (if any) and will specify their fixes or workarounds in the product's specific build document.

If you should encounter any issues with your product, please feel free to reach out to me via the contact form on this website. As I am based in Israel, I understand the inconvenience added by international shipping, and so I will be happy to assist in troubleshooting with you any problems before resorting to international shipping in case a repair needs to be made.