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MXR MX-103 Blue Box (Vintage - Script Logo)

MXR MX-103 Blue Box (Vintage - Script Logo)

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$99.99 to $189.00 Price Tier: Standard

4.5 (4)

1 Review

This product is Vintage or Discontinued

Newer option

MXR M103 Blue Box

$88.24 - $113.00

4.0 (94)

Find out who is using MXR (Script Logo)

1 community setup

3 wishlisted

13 saved

Page last updated Jun 27, 2026

Pricing and availability

We compare 600+ stores and found this item at 6 stores. Prices updated June 18, 2026.

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Reviews

Price

4.5 (13)

$99.99

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4.5 (12)

$99.99

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$189.00 12 available Used

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4.0 (35)

$99.99

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4.3 (61)

$114.00 $113.00 $1.00 · All time low

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£100.50

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Average Price: $117

Standard/Professional

$60

$181+

Price Tier

In the Fuzz Effects Pedals category, MXR MX-103 Blue Box (Vintage - Script Logo) is priced in the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

Budget

Standard

High-end

Price History

Based on price data from 5 merchants for "MXR MX-103 Blue Box (Vintage - Script Logo)". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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Unleash the beast with the MXR Blue Box (Script Logo), where simplicity meets sonic chaos in a pedal that has carved its niche in the world of fuzz effects. This pedal doesn't just enhance your sound; it transforms it into a wild, untamed force, thanks to its unique two-octave-down tone generator. Whether you're looking to create monstrous fuzz tones or dive into the abyss with glitchy, 8-bit inspired sounds, the Blue Box offers a playground of auditory possibilities.

Inspired by the likes of J Mascis and King Buzzo, the Blue Box is perfect for those who revel in the unconventional. With just two knobs, you can effortlessly sculpt your sound. The Output knob lets you control the fuzz level, while the Blend knob allows you to mix in that unpredictable double-octave magic. This pedal thrives on simplicity, yet offers a depth of creative potential that few others can match. Whether you’re channeling classic rock vibes or pushing the boundaries of noise rock, the Blue Box stands as a testament to innovation and tradition.

Crafted for those who dare to venture beyond the ordinary, the MXR Blue Box is more than a pedal—it's a gateway to a new sonic frontier.

Key Features:

Aggressive fuzz tones
Unique two-octave-down tone generator
Simple interface with Output and Blend controls
Operates with a 9V battery or optional power supply

Product specs

Brand	MXR
Model	MX-103 Script Blue Box 1973 - 1975
Finish	Blue
Year	1975 - 1984
Made In	United States
Categories	Octave and Pitch-Shifting Pedals
Pedal Format	Standard

FAQs

What kind of sound does the MXR Blue Box (Script Logo) produce?: The MXR Blue Box (Script Logo) produces a unique octave fuzz effect, combining your guitar signal with an octave below for a thick, subharmonic tone. It's known for its raw, vintage fuzz sound that's perfect for experimental and psychedelic music.
How does the blend control on the MXR Blue Box (Script Logo) work?: The blend control on the MXR Blue Box allows you to adjust the mix between the fuzzed signal and the two-octave-down effect. This enables you to customize the balance of fuzz and octave to suit your tonal preferences.
Is the MXR Blue Box (Script Logo) suitable for bass guitar?: Yes, the MXR Blue Box (Script Logo) can be used with a bass guitar, offering a deep, gritty octave fuzz effect that enhances the lower frequencies for a powerful, unique sound.
What power options are available for the MXR Blue Box (Script Logo)?: The MXR Blue Box (Script Logo) can be powered by a 9-volt battery or a 9-volt AC adapter, such as the Dunlop ECB003/ECB003E, making it versatile for various setups.
Does the MXR Blue Box (Script Logo) work well with other pedals?: The MXR Blue Box (Script Logo) is known for its compatibility with other pedals, especially when placed before or after overdrives and distortions, allowing for creative and experimental soundscapes.

Videos

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Noise Trust

Uncontrollable Defiance - MXR Blue Box Script Guitar Pedal

Noise Trust

MXR Blue Box Script Re Issue

Guitar Bazaar

Reviews

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR MX-103 Blue Box (Vintage - Script Logo).

Features and functionality

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The right knob on the MXR Blue Box controls a blend from two octaves down to a clean signal, offering a wide range of tones in between.
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The Blue Box has been noted to sound particularly large when paired with a Big Muff, though it requires nearly maxed volume for unity in certain models.
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Use cases and applications

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Works exceptionally well for creating glitchy synth-like effects when paired with heavy reverb and long delay settings.
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The MXR Blue Box is effectively used as a sub-oscillator for a modified Korg Monotron, providing perfect tracking without glitches.
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Running the Blue Box into a Turbo Rat or pairing it with a Speaker Cranker is suggested for unique tonal effects.
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Mods and upgrades

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A Keeley mod offers a toggle switch with three modes: stock, more stable octaves, and more glitchy, each with improved volume.
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The C11 mod is praised for enhancing volume output and is recommended as a switchable option for added flexibility.
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The C11 mod is praised for enhancing headroom and midrange; it's a simple mod requiring the removal of a single component, with no soldering needed.
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A switchable mod allows the pedal to toggle between 2 octaves and 1 octave down, which thickens the sound, especially for chords.
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Comparisons

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The pedal is likened to a defective OC-2 due to its quirky monophonic tracking, adding to its charm.
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The script logo version reportedly achieves unity volume earlier and offers a slightly better fuzz tone compared to the block logo version.
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The Blue Box is compared to a combination of an old OC-2 and a cheap fuzz, with some users preferring the latter for better sound and adjustability.
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For those who didn't enjoy the Data Corrupter's overwhelming pitch drop, the MXR Blue Box offers a more manageable level of glitchiness and a usable fuzz.
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User experience

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Owners report that using the neck pickup and rolling back the tone control can improve tracking, albeit at the expense of some excitement.
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Some users report that even when the octave is dialed out, it can still bleed through the amp, which can be unwanted if only distortion/fuzz is desired.
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Value and pricing

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Owners have noted that a used MXR Blue Box can be found for around $50 at Guitar Center, making it a low-risk investment for those curious about its sound.
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4.5 out of 5

Based on 1 Review and 4 Ratings

5 star

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1 star

ashtraycat

205

about 5 years ago

fuzzzz

I was made aware of this octave fuzz pedal by Rowland S. Howard. It sounds like an evil motorbike about to explode. It's groovy. Sonic Youth & Dinosaur Jr. think so too.

Roles:

Guitarist Bassist

Genres:

Electronic Rock Experimental