MXR M66S Classic Overdrive

$34.99 to $75.99 Price Tier: Standard

4.5 (3)

1 Review

All time low price

Find out who is using MXR M66S

2 community setups

1 wishlisted

15 saved

Page last updated Jul 01, 2026

Pricing and availability

We compare 600+ stores and found this item at 3 stores. Prices updated July 1, 2026.

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Reviews

Price

4.5 (38)

$75.99

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5.0 (21)

$34.99 29 available Used

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5.0 (5)

$75.99 $59.99 $16.00 · All time low

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Average Price: $57

Standard/Professional

$50

$176+

Price Tier

In the Overdrive Effects Pedals category, MXR M66S Classic Overdrive 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 2 merchants for "MXR M66S Classic Overdrive". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

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Introducing the MXR M66S Classic Overdrive, the quintessential addition to your pedalboard that serves up a delectable range of overdrive tones without overshadowing your guitar's inherent voice. This pedal offers a perfect blend of grit and gain, with an independent output and gain control that allows you to fine-tune your sound.

Easily adjust your gain for a rich, creamy overdrive or just a hint of grit, and balance the output volume to suit your venue, whether you're jamming at a local bar or rocking an arena. The straightforward footswitch makes it easy to toggle the overdrive effect on and off, letting your guitar's natural tone shine through when you need it.

The M66S isn't just about great sound, it's also built for the road. With a robust, die-cast enclosure, it's designed to withstand the rigors of touring, ensuring the same great overdrive sound gig after gig. Power it with a 9V battery or a Dunlop AC adapter for even more flexibility.

Key Features:

Independent output and gain controls for versatile tone shaping
Simple bypass footswitch for easy toggling
Rugged die-cast enclosure for durability
Can be powered by a 9V battery or Dunlop AC adapter
Provides a range of overdrive tones without sacrificing your guitar's inherent tone

FAQs

What kind of sound can I expect from the MXR M66S Classic Overdrive?: The MXR M66S Classic Overdrive delivers a warm, natural overdrive that enhances your guitar's tone with added grit and sustain, perfect for blues and rock genres.
How does the MXR M66S Classic Overdrive differ from other overdrive pedals?: The MXR M66S Classic Overdrive features output and gain controls for precise tonal shaping, allowing you to maintain clarity and definition across various volume levels.
Is the MXR M66S Classic Overdrive suitable for use with both tube and solid-state amplifiers?: Yes, the MXR M66S Classic Overdrive works well with both tube and solid-state amplifiers, providing versatile tonal enhancement regardless of your amp setup.
Can the MXR M66S Classic Overdrive be used as a clean boost?: Yes, by adjusting the gain control to a lower setting, the MXR M66S Classic Overdrive can function as a clean boost, adding volume and clarity without significant distortion.
Does the MXR M66S Classic Overdrive pedal require a specific power supply?: The MXR M66S Classic Overdrive can be powered using a standard 9V DC power supply or a 9V battery, offering flexible powering options for different setups.

Videos

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gearmanndude

MXR Classic Overdrive GC exclusive guitar effects pedal demo with Semi-Hollowbody Gibson

gearmanndude

This Pedal Has A Secret Switch On The Inside!

Robert Jackson

Did You Know MXR Has A Line Of Budget Pedals? | I Bought ALL 3 For Under $100!

Robert Jackson

MXR Classic Overdrive M66S Hidden switch Zakk Wylde Mode - Metal Demo and Review

Solomonic Demons

Reviews

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PROS

Adds life to the sound, especially when paired with other pedals
Provides the right amount of drive without excessive distortion
Offers beautiful mid boost and sustain
Transparent effect in both overdriven and clean amp setups
Versatile second mode with flat mids for humbuckers
First mode excels with tube screamer-like qualities without cutting lows
More gain and volume available than typical tube screamers
Responsive to pick attack and dynamics
Wide tone knob sweep
Affordable, making it accessible for budget-conscious musicians

CONS

Second mode may not meet expectations for a ZW overdrive sound
Not ideal for metal genres; better suited for blues and classic rock

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about MXR M66S Classic Overdrive.

Features and functionality

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The pedal is described as having a "brown sound" overdrive, warm with a limited gain range, suitable for classic rock tones like AC/DC.
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The pedal doesn't mention the internal switch feature in the manual, making it an "Easter egg" for those who discover it through forums or experimentation.
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Some models share circuit board designs, allowing quick manufacturing adjustments by flipping the switch, enabling different pedal variants to be produced efficiently.
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Mods and upgrades

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Inside the pedal, a micro switch can change the voicing from Zakk Wylde OD to MXR GT-OD, accessible with a paperclip.
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Some owners drill a hole in the pedal's casing for easy access to the internal switch, turning it into a dual-function pedal without needing to open it.
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A user replaced the internal switch and removed op amp clipping diodes, adding a switch with hard clipping for enhanced output, customizing the pedal's tonal capabilities.
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Comparisons

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The pedal's tone is compared to a sound between Bonamassa and Clapton, offering a bluesy, creamy solo tone.
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Owners note the Zakk Wylde OD setting is suited for heavier music styles, contrasting with the classic tone preferred for more traditional sounds.
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Use cases and applications

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Works well with a Squire Obey Series Tele with Bridge Duncan Humbucker, providing a good greasy slide tone and gritty double stops.
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Value and pricing

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Scored for $20 on clearance, significantly lower than the original $120 price, making it a valuable find.
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Other

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Earlier pedal versions may lack the internal switch, suggesting a manufacturing change that not all models share, which can affect modding potential.
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4.5 out of 5

Based on 1 Review and 3 Ratings

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crockett

143

about 8 years ago

Classic Overdrive

This is a great lead pedal if pushed the right way. I use this pedal stacked with the EHX Soul Food. They sound great together and pair well with wet effects.