The Fulltone Fat-Boost FB-3 is a versatile analogue boost and preamp pedal built around a discrete Class-A FET circuit.

With up to 35dB of available gain, an 11-step Drive control and separate Bass and Treble controls, it can cover everything from clean level boosting to thicker, harmonically rich preamp-style tones.

This pre-owned example is in Good Condition and is supplied without a power supply.

Up to 35dB of Gain

The FB-3 offers plenty of output for:

• Solo boosts

• Driving valve amplifiers

• Gain stacking

• Adding sustain

• Pushing other pedals

• Always-on preamp use

• Restoring level in larger rigs

Lower Drive settings favour cleaner boosting, while higher settings add more harmonic character and mild clipping.

11-Step Drive Control

The 11-position FET Bias Drive control is one of the FB-3’s standout features.

It allows the pedal to move from relatively clean boost sounds into warmer and more saturated territory without becoming a conventional high-gain overdrive.

Bass & Treble Shaping

Controls include:

• Drive – Sets FET gain and character

• Volume – Controls overall output

• Bass – Adjusts low-frequency content

• Treble – Passive high-frequency roll-off

The Bass control is particularly useful when pushing an amp harder, helping keep the low end tight and controlled.

Key Features

• Fulltone Fat-Boost FB-3

• Boost / preamp pedal

• Discrete Class-A FET circuit

• Up to 35dB gain

• 11-step Drive control

• Volume control

• Bass control

• Treble control

• Clean-to-mild-drive capability

• True bypass

• 1MΩ input impedance

• 10kΩ output impedance

• Approx. 5mA current draw

• 9V battery operation

• 9–18V DC operation

• Centre-negative power

• Good Condition

Condition

Pre-Owned – Good Condition

This pedal shows cosmetic signs of previous ownership and normal pedalboard use.

It remains fully functional and ready for rehearsal, recording or live performance.

Please study the listing photographs carefully for the individual cosmetic condition of this pedal.

What’s Included

✔ Fulltone Fat-Boost FB-3 Booster Pedal

✘ No Power Supply Included

Power Requirements

The FB-3 can be powered by:

• 1 x 9V battery

• Suitable regulated 9–18V DC centre-negative power supply

Current draw is approximately 5mA.

Running at 18V provides additional headroom for a cleaner and more open response.

No external power supply is included.

Checked & Tested

This pre-owned Fulltone Fat-Boost FB-3 has been checked by the Fair Deal Music team for general operation before being offered for sale.

Ideal For

• Blues

• Rock

• Country

• Roots

• Clean boosting

• Valve amp boosting

• Gain stacking

• Solo boosts

• Always-on preamp use

• Guitar

• Bass

Fair Deal Music Verdict

The Fulltone Fat-Boost FB-3 is a flexible boost that offers considerably more control than a basic one-knob design.

Its 35dB of available gain, 11-step Drive control and dedicated Bass/Treble shaping make it useful for everything from transparent level boosts to warmer preamp-style tones with added harmonic character.

The ability to run at 9V or 18V adds further flexibility, particularly for players who want extra headroom and a more dynamic response.

This example is in Good Condition and is supplied without a power supply.

Fair Deal Music is an independent, family-run music retailer established in Birmingham in 1987.