
 Anthony Easton
Anthony Easton
The Flat 4 Boost by Vox is a vacuum tube booster pedal that offers versatile functionality as a mid-boost, treble-boost, overdrive, and full-range boost. It incorporates a Baxandall tone circuit that allows adjustment from the flat position to the desired boost or cut range. The pedal features an all-discrete circuitry, true bypass design, and a tough die-cast body that can withstand the rigors of the road. The newly developed Hi-Volt technology allows the tube to operate at 200V, even on battery power, and the gain control lets users adjust the tonal character. Additionally, the heater current’s slow start circuit ensures vacuum tube longevity.
Specifications:
- Input Impedance: 1M Ω
- Output Impedance: 2.2k Ω
- Vacuum Tube: ECC83 / 12AX7
- Connections: INPUT jack (guitar input), OUTPUT jack (line output), AC
adapter jack
The Flat 4 Boost is suitable for guitarists looking to achieve vintage tube- driven boost tones and is particularly useful for blues guitarists who wish to highlight their picking nuances. The pedal's independent mid-boost switch allows users to switch the response of the mid-range, making it ideal for lead playing.
Watch the latest video demos and reviews for the Flat 4 Boost from YouTube. Stompbx updates this every six months to reflect the most popular reviewers and guitar pedal demos for each pedal.

Below are live Reverb listings for the Vox Flat 4 Boost from Reverb. Stompbx automatically aggregates current offers to give you a quick look at available models, conditions, and prices. Perfect for comparing options and making an informed purchase.

Browse through eBay listings for the Flat 4 Boost compiled in real-time. From vintage finds to brand-new units, see a variety of purchasing options. This automated collection helps you explore deals and find the right pedal at the right price.

Used
$192.50

Used
$146.65

Used
$208.79

Used
$181.86

Open box
$150.00

Discover pedals with similar features or sounds to the Flat 4 Boost. This section leverages data to suggest alternatives that complement or expand your pedalboard. Ideal for exploring related sounds or finding a pedal that matches your specific needs.

Free The Tone
FB-2 Final Booster

Keeley
DDR Drive Delay Reverb

Shnobel Tone
Daily Driver

XAct Tone Solutions
Tejas Drive

Tone City
Mandragora Overdrive

ZVEX
59 Sound

Radial
Tonebone Trimode

Lollygagger FX
Canaglia

Cusack Music
More Louder

Pettyjohn Electronics
PreDrive Studio

Beetronics FX
Royal Jelly

Vertex
Steel String Clean Drive MKII

ThorpyFX
The Heavy Water

Bogner
Wessex Overdrive

Wampler
Clarksdale Delta Overdrive

EarthQuaker Devices
Arrows
Check out the latest news and articles from around the pedal world.

 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton
 Anthony Easton
Anthony Easton