Pro Co Fat Rat Selectable Mosfet Clipping and Boost Distortion Pedal

Guitar/Bass Distortion Pedal with Vintage and MOSFET Clipping Circuits, Bass Enhancement, and 9-18V Operation
Pro Co Fat Rat Selectable Mosfet Clipping and Boost Distortion Pedal image 1
Pro Co Fat Rat Selectable Mosfet Clipping and Boost Distortion Pedal image 1
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Pro Co Fat Rat Selectable Mosfet Clipping and Boost Distortion Pedal
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The Rat On Steroids

The iconic Rat has had an overhaul, and here at Sweetwater, we're very excited! Pro Co's new US-made Fat Rat distortion pedal gives you a choice between the original or a new MOSFET clipping circuit, which delivers a smoother upper midrange for a more amp-like tone - without losing that classic, inimitable Rat feel. Also onboard is selectable bass enhancement that increases your low end response - perfect for bassists and down-tuned guitarists. Fat Rat now runs on 9-18 volts, juicing your headroom and fidelity, and sports a socketed op-amp, which lets you easily change between popular chips for even more tonal dexterity.

Pro Co Fat Rat Guitar Distortion Pedal Features at a Glance:
  • A cool update of the classic Rat!
  • Choose between original or new MOSFET clipping circuit
  • MOSFET circuit delivers smoother upper mids for more amp-like tone
  • Selectable bass enhancement increases low end response for bassists and down-tuned guitarists
  • Socketed op-amp lets you change between the stock OP07DP and other popular chips
  • Runs on 9-18 volts, juicing your headroom and fidelity
The Pro Co Fat Rat: it's the Rat on steroids!

Tech Specs

Pedal Type Distortion
Inputs 1 x 1/4"
Outputs 1 x 1/4"
Manufacturer Part Number FATRAT

Customer Reviews

Based on 3 reviews
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Follow up Review......

This is a follow up to my original review, hopefully this information will be useful to anyone looking at this pedal. As much as I love the classic Rat tone, sometimes the mids feel a little too forward and the pedal feels a bit stiff. I recently switched the clipping switch from Stock to MOSFET and the difference has been substantial. The pedal is much more natural and responsive in MOSFET mode, and mids are slightly more relaxed. Medium gain tones are more convincing and the pedal just feels better to play. I am using this pedal with two LP's and a vintage Gretsch, all played through clean Fender amps. I set the Fat Rat up for a good medium gain tone, then boost it with a Mini Tube Screamer for leads and heavier sounds. Initially I preferred the Stock sound, which is based on the Whiteface Rat. After several more hours of playing I now prefer the MOSFET setting. Overall, I am still very happy with this pedal and continue to find good sounds in it. I am glad I purchased a real Rat and not a clone. I hope this information is helpful. Rock on!!

A Modern Classic

I purchased two Fat Rats from Sweetwater and I am extremely satisfied with them. One is on my board and the other serves as a backup. The stock chip sounds very good, but I did end up replacing the chips in both pedals with some old LM308N's. To my ears the 308's are slightly darker and smoother. This pedal replaced an OCD and a Crunch Box and works much better with my Fender amps. The different modes work very well and offer very usable tones, although I prefer the stock settings most of the time. The large case, vintage style knobs and silk screened logo remind me of the old Rats I used to own. Best thing is the tone, it sounds like my old Rats and has some added versatility as well. The socketed op-amp is a simple but brilliant idea, more manufacturers should do this. The pedal is built like a tank and everything is neatly wired and assembled. If you are a Rat fan or are looking for something different and more "old school" I highly suggest you consider the Fat Rat.

High price for a Rat, but some really nice options.

This is a solid pedal. Great old rat sound with some nice new mods. It is big on a pedal board, but could possibly be your one distortion depending on your needs. For me, it fits at least half of my applications. The bass boost give something more to a Big Muff type sound, while the new mosfet switch gives me a much smoother sound that allows the pedal to be used more in blues applications.
See also: Distortion Pedals, Pro Co, Pro Co Distortion, Overdrive, Boost & Fuzz