Fulltone FatBoost 3 FB-3

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$95.00 Price Tier: Standard

4.5 (21)

2 Reviews

This product is Vintage or Discontinued

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22 wishlisted

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Page last updated Jun 30, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated June 30, 2026.

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5.0 (29)

$95.00 4 available Used

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Average Price: $95

Standard/Professional

$60

$151+

Price Tier

In the Boost Effects Pedals category, Fulltone FatBoost 3 FB-3 is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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High-end

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Description

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Elevate your guitar's presence with the Fulltone FatBoost 3 FB-3, a pedal that has become a staple for musicians seeking to add up to 35dB of clean gain to their sound. This third iteration of the beloved boost pedal continues to impress with its refined design and features. The 11-step FET MuAmp circuit is at the heart of the FB-3, delivering a pristine boost that retains the natural tone of your instrument while adding the power you need to cut through the mix.

Perfect for live performances and studio sessions alike, the FatBoost 3 ensures that your signal remains strong and clear, even when using long cable runs or passive pickups. The proprietary anti-pop function ensures smooth, noise-free operation when engaging or disengaging the pedal, making it a reliable choice for any gig. With intuitive controls for gain, treble, and bass, you'll have no trouble dialing in the exact tone you're after.

Whether you're pushing your amp to achieve a rich, saturated overdrive or simply enhancing your clean signal, the Fulltone FatBoost 3 FB-3 is a versatile tool that will find a permanent place on your pedalboard.

Key Features:

Up to 35dB of clean gain
11-step FET MuAmp circuit
Proprietary anti-pop function for silent operation
Intuitive controls for gain, treble, and bass adjustments
Ideal for both live and studio settings

Product specs

Brand	Fulltone
Model	Fat Boost FB-3
Finish	Silver
Year	2010s
Made In	United States
Categories	Overdrive and Boost Pedals

FAQs

What type of circuit is the Fulltone FatBoost 3 FB-3 based on?: The Fulltone FatBoost 3 FB-3 is based on a FET transistor amplifier circuit, which provides a transparent boost to your guitar signal.
How does the Fulltone FatBoost 3 FB-3 affect my guitar tone?: The Fulltone FatBoost 3 FB-3 enhances your guitar tone by adding a clean boost with increased headroom and clarity, making it ideal for pushing your amp into natural overdrive.
Can the Fulltone FatBoost 3 FB-3 be used with both electric and acoustic guitars?: Yes, the Fulltone FatBoost 3 FB-3 can be used with both electric and acoustic guitars, offering a clean boost that enhances the natural tone of either instrument.
Does the Fulltone FatBoost 3 FB-3 require a specific power supply?: The Fulltone FatBoost 3 FB-3 can be powered using a standard 9V DC power supply or a 9V battery, providing flexibility for different pedalboard setups.
Is the Fulltone FatBoost 3 FB-3 suitable for live performances?: Yes, the Fulltone FatBoost 3 FB-3 is suitable for live performances due to its robust build and ability to deliver consistent, transparent boost to your signal chain.

Videos

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ProGuitarShopDemos

Fulltone Fat Boost 3

ProGuitarShopDemos

Fulltone Fatboost 3 vs Fat Boost 2 guitar effects pedal shootout w Telecaster & Blues Jr amp

gearmanndude

Fulltone Fat Boost FB-3 - Gear Review

YourGuitarSage

Fulltone Fat Boost 3 stacked with Gearmanndude Luther Drive guitar effects pedal demo

gearmanndude

Fulltone Fat Boost 3 (FB-3).MOV

AskAGuitarPro

Fat Boost FB-3 Fulltone Demo 9v VS 18v

MrSonG St

Fulltone Fat-Boost FB-3 - Martin's Monday Pedal Playthrough

Martin Cliffe - Music, Minimalism & Mental Health

Reviews

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PROS

Provides a full, tube-saturated boost for a richer sound
Super transparent, offers ultra-clean boosting to light-medium overdrive
Adds musical life to sounds, enhancing depth, brightness, warmth, and push
Unique percussive sound quality, making string snaps shine distinctively
Highly versatile with more tonal options compared to other boost pedals
Reacts like a class A amp due to its use of FET
Can be used to highlight solos or add body to overall sound
Functions well when left on constantly for an additional punch

CONS

Placement in pedal chain may affect optimal performance

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Fulltone FatBoost 3 FB-3.

Features and functionality

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The Fulltone FatBoost 3 provides a substantial 35dB of clean boost, allowing users to fine-tune their sound with bass and treble controls for a warmer, fatter tone.
Source

Comparisons

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Users find the FatBoost 3 superior to the MXR Micro Amp, noting it avoids excessive treble when cranked and delivers a fuller sound.
Source

Use cases and applications

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Many users keep the FatBoost 3 on 'always on' duty, appreciating how it enhances signal warmth with gain settings at 12 o'clock or higher.
Source
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The FatBoost is effective for fattening up a signal in jazz solos and pushing a Marshall Plexi for a satisfying crunch.
Source

User experience

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Owners appreciate the transparency of the FatBoost 3 when gain is minimized, while also valuing its ability to add fatness and warmth to their signal.
Source
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A long-term owner has successfully used the Fulltone FatBoost for over 12 years, highlighting its reliability and versatility across different amplifiers and musical styles.
Source

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4.5 out of 5

Based on 2 Reviews and 21 Ratings

5 star

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gato

143

over 5 years ago

An Exemplary Booster

I've had this pedal for years and I think it's one of the best on the market.

When I bought it, I was looking for a boost pedal that would add a little magic to the mix, and this pedal has it! The extra life it gives your sounds is very musical, it adds depth, brightness, warmth, and drive. With it, you can not only highlight solos, but you can also use it to give your sound more body or keep it connected all the time to get a little extra punch that makes the snap of the strings shine in a very particular way; the percussive sound that this pedal can provide is very unique, irreplaceable. In addition to being a solid, high-quality, and very versatile pedal. I wouldn't take it off my pedalboard for anything.

This review has been translated automatically into English. See original

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