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Pettyjohn Electronics Iron MKII Overdrive Guitar Effects Pedal
Pettyjohn Electronics Iron MKII Overdrive Guitar Effects Pedal Pettyjohn Electronics Iron MKII Overdrive Guitar Effects Pedal Pettyjohn Electronics Iron MKII Overdrive Guitar Effects Pedal

Pettyjohn Electronics Iron MKII Overdrive Guitar Effects Pedal

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  • Box and circuit handmade in the beautiful Pacific Northwest, USA
  • Dimensions: 2.75”W x 4.75”L x 2.5” H
  • Weight: 2 lbs

Manufacturer's Description

The Pettyjohn IRON MKII is a full re-work of our classic medium gain overdrive. Since its release over three years ago the IRON has become one of our most popular drives. The IRON has been loved for its ability to musically thicken your tone with the harmonic richness and touch sensitivity of vintage American amps pushed to the edge of breakup.

Originally developed as a second stage drive as part of the PettyDrive, it excels at being a second stage drive, stacking on top of another, largely in thanks to the clean mix feature. We have listened to feedback from players and dealers alike and have come up with a refined IRON MKII exemplifying Pettyjohn’s uncompromising approach in studio-grade tone engineering and product aesthetic.

The IRON MKII also represents Pettyjohn Electronics step toward more modular and customized pedal builds. We’re proud to announce the IRON MKII offers four customizable upgrades to build the ultimate tool for tone.

The Pettyjohn IRON MKII is a full re-work of our classic medium gain overdrive. Below is a deep-drive into the features of the IRON MKII.

All New EQ

We sharpened our pencils and set out to improve one of our favorite pedals. We decided to start by vastly increasing the frequency range of the pedal. The original circuit had a decent amount of built-in filtering and relatively limited tone shaping tools, which in some rigs could be too dark. We redesigned the whole pedal for full audio frequency response, 20Hz to 20kHz. To compensate for this extra range, we added our signature wide-range sweepable Low and High cuts, giving the user complete control over the tone!

The LOWS control sweeps at 6dB per octave from sub frequencies to 1kHz allowing the user to precisely set the low-end profile. Furthermore, the low cut is pre-overdrive stage so the way it is set greatly impacts the way the overdrive circuit loads and clips.

The HIGHS control is a similar sweep from the other side of the frequency spectrum ranging from 20kHz down to 1kHz. The HIGHS control utilizes a genuine Orange Drop capacitor that has been selected for its classic, smooth tonal qualities, i.e. MOJO!

We also offer a custom shop modification to the HIGHS control which give several other “flavors” by exchanging this Orange Drop capacitor for other types of capacitors. Tune your highs to be more clean and punchy with the WIMA MKP10 mod or more transparent and open with the Audiophile mod. These mods have a subtle but noticeable effect on the tone and feel of the highs, especially at higher overdrive levels.

More to Gain

We also expanded the gain range making the IRON MKII much more versatile. The lower gain range has been extended, giving more settings akin to preamp or clean boost without overdrive. The GAIN control now tops out with almost 2x the original gain amount!

With the greatly extended controls and gain range the IRON MKII can satisfy almost player in a wide range of applications. Whether looking for an always-on low-gain sweetener, fully overdriven, thick rhythm playing chords or soaring, classic leads this pedal has something for everyone. Through much toil we believe we have taken this pedal to the next level both sonically and functionally.

High Voltage

We have also updated the IRON MKII with our new proprietary dual rail power supply offering an industry leading 36 Volt swing from a 9V, 200mA standard adaptor. As far as sound quality goes, high voltage means high headroom, and 36v is the maximum level most opamps are designed to operate safely at so the high quality opamps are operating at maximum potential.

High headroom and high voltage imparts an openness and 3D quality to the sound that sounds amazing and just feels great while playing. Now everyone can have the tonal experience of high headroom when they plug in the pedal, without the need for a special adaptor. There is also an internal switch to reduce the power rails to a cool 20 Volts, offering a bit more sag and vintage vibe for players who love that sound!

Clip Blend

Continuing the trend we started with the CHIME MKII, we have replaced the mini toggles with mini pots for extended sonic control. Now you can use the CLIP mini pot to blend between lower headroom Silicon diodes and a pair of Red LED with higher headroom before clipping to accomplish the perfect amount of saturation and drive at any gain setting.

Use the internal switch to change the silicon (SI) settings from asymmetrical (lifted from the IRON V1) and symmetrical silicon diode for even lower headroom and more grit.

Further dial your clipping tones by selecting from our two new clipping mods. The Fuzz Head mod offers Germanium diodes or slam in some brand new quantum tech with the Nanolog N2! It gives tube-like, smooth distortion from a unique solid-state device based on vacuum-deposited Carbon. Designed to be used in place of the usual silicon or germanium diode pair, the N2 is like having a pair of vacuum tube diodes in the loop offering dynamic, open, and warm tones. Want to nerd out more? Check out the full spec of the Nanolog’s N2 device.

All New Clean Mix

We fully re-designed the CLEAN mix circuit on the IRON MKII. The control is now on the lower mini pot and well marked. When it is OFF, there is no clean mix active. As you roll the pot clockwise towards MIX setting it effectively pushes a fader up on a parallel clean signal. Blend in until the feel is just right, perfect for adding organic tone and feel to the overdriven signal or thicken a clean boost signal.

This feature really comes in handy when using the IRON MKII as a second or third stage drive, as using the clean mix allows the character of the previous overdrive pedals to still come through while also adding the overdrive of the IRON MKII in parallel. This helps avoid the “clamped” or “constricted” sound many people experience when stacking drives.
Quiet Bypass Switching System

The IRON MKII comes with our new relay based true bypass circuit with soft touch switch. We have had many requests for this and after a deep research and development cycle have designed a relay circuit which mets our demanding quality standards. We are very proud of our unique design accomplishing a totally quiet switch via a sonically transparent gold contact relay. It auto-bypasses when the power is disconnected, never leaving you in the dark!

Hardwire, classic true bypass is available via custom order options above for players wanting looper operation, however, this option does not offer a soft switch nor our quiet switching system.


  • New! High voltage power! – 36 Volts of internal power from standard 9v adaptor (200mA)
  • New! Relay True Bypass switching – Soft touch switch with totally quite switching and auto-bypass when power is off
  • New! HIGHS and LOWS wide range sweepable filters
  • New! Clipping mix knob, blend between Silicon and LED clipping
  • New! Increased headroom and lower noise on all stages
  • New! Active output level control for no tone loss and clean boost power
  • New! Discrete Opamp Upgrade Option – Upgrade to CHIME MKII Deluxe and the input and output stages become powered with our Studio Grade dual 990 style discrete opamp for extra clarity and depth
  • New! Knobs and Labels – Easier to read on stage
  • New! Foundry Series MKII custom enclosure with in-set screws

Audiophile, Studio-Grade Performance

  • Burr Brown OPA input and output buffer
  • Audiophile grade, through-hole 1% Metal Film resistors
  • Top-shelf WIMA and Silver Mica caps used in tone sensitive operations
  • Lead-free PCB constructed with Audiophile lead-free silver solder
  • Extremely low noise

Our Mission

Our team of musicians fuses the spirit of the local guitar shop with the convenience of the web by creating a reliable and worry-free buying experience.

At Music Store Live, our goal is to revolutionize the way gear is bought online. It’s not just about videos and know how; it’s about the person on the other end of the line. Whether you are in Tokyo or Toledo, we invite you to experience the reality of a living online music store and help us shape the best buying experience possible. As you'll see in the video below, we're musicians just like you. We strive to offer the best gear, the best online experience, and the best personalized service in the industry. We invite you to get to know our team, and we would love the opportunity to get to know you too!

Free Shipping - Free Return Shipping - 30 Day Returns

At we are proud to offer free return shipping and a 30-day return policy in the 48 contiguous states on all new* items over $30. It's all part of our mission to bring the guitar shop to your living room. This policy allows you to get your gear hassle-free and try it with your own rig to be sure that it truly fits with your playing style and sound. If it doesn't work the way you had hoped we'll send you a prepaid return label and work up an exchange or issue you a refund once we get the item back in the same condition it was purchased. It's that simple.

Please allow 2-4 business days from the receiving date for returns to be processed.
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In most cases we ship same day if your order is placed by 12 p.m. EST Monday thru Friday!

Return Policy Details
Is your instrument just not doing it for you? We understand and we absolutely want you to be thrilled with any gear that you buy from If you're not happy with your order, you can return it to us at no charge within 30 days of delivery.

  • Customers outside the continental USA must pay their own return shipping and are responsible for all applicable taxes and fees.
  • The return policy does not apply to custom orders or modifications (pickup installs, etc)
  • Contact MSL at or (866) 256-5725 to begin the return process. You can request a refund, store credit, or exchange.
  • We'll provide you a return label via email.
  • Ship the item back to us in its original packaging using the provided return label.
  • Customer is responsible for returning the item to Music Store Live in its original condition.
  • A refund or exchange will be issued within 3 business days from our receipt of the returned item.
  • All returns will go through a technical inspection and are subject to a restocking fee if the item is not returned in its original condition. Restocking fee to be determined by MSL.

Layaways & Financing


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  • Contact MSL at or (866) 256-5725 to place your initial deposit.
  • Pay it off at your convenience within 30 days.
  • $100 layaway fee for each additional month over the initial 30 days (on most items).


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