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The IRON has been loved for its ability to musically thicken your tone with the harmonic richness likened to vintage American amps pushed to the edge of breakup.

The IRON MKII is a upgrade to our classic medium gain overdrive. Originally developed as a second stage drive as part of the PettyDrive, it naturally excels at being a second stage drive, stacking on top of other drives.

We have listened to feedback from customers and artists to come up with a refined IRON MKII exemplifying Pettyjohn’s uncompromising approach in studio grade engineering, boutique tones and product aesthetic.

The IRON MKII also boasts an all new EQ experience. For starters, the MKII has vastly increased frequency range. 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.

FOUNDRY Series - Dual Rail Power Supply
All Pettyjohn FOUNDRY Series now include one of our biggest innovations ever: a new proprietary dual rail charge pump. This little gem is a major upgrade from our CORE Series charge pump and is a sophisticated dual rail dc to dc converting internal power supply. Our charge pump provides an incredible +/-18v of internal power, for a total of 36v, and all from a standard regulated 9v power adapter (200mA). Say what!?

When you increase voltage you increase the headroom which then affects the tone and feel of a pedal. Dual rail power supplies are usually found only in classic studio gear, until now. The FOUNDRY Series charge pump delivers up to a massive four times the headroom of most guitar pedals. This high headroom imparts an openness and 3D quality that is unique to Pettyjohn FOUNDRY Series pedals. 36v is the maximum spec for most opamps empowering the high-qualify opamps in FOUNDRY Series pedals to operate at their maximum potential.

FOUNDRY Series - Silent Bypass
We have had many requests for this over the year and were happy to announce all FOUNDRY Series now shop with a totally quite foot switch enhanced with 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 on our website for those who may prefer this option.

FOUNDRY Series - The Indestructible Enclosure

While most pedal companies opt for an off-the-shelf enclosure, we took the path less traveled. FOUNDRY Series boasts a nearly indestructible two-plate custom enclosure design forged from mild steel right here in the USA. The boxes feature a gentle sloped front edge to protect the top control panel, features recessed bottom screws, and is finished with a thick powder blast of sparkling hues that will have you gitty as a goon.

FOUNDRY Series - Studio Grade Components

At Pettyjohn we build true studio-grade pedals. No, this isn't some cheeky marketing jargon; we accomplish extremely low signal noise with carefully selected top-shelf components:

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 
Carefully selected upgrade mods for every Pettyjohn pedal

IRON MKII

From $299.00

IRON Opamp Mods

IRON Tone Cap Mods

Quantity

Dual 990 Discrete Opamp Mod - Our standard IRON MKII ships with high quality Burr Browns opamps taking care of input and output buffering. Upgrading to the IRON MKII opamps replaces one Burr Brown with a dual studio-grade 990-style discrete opamp. This chip runs the input buffer and the active level control stage giving the IRON a more natural, open sound quality that is truly uncompromising.

Audiophile Mod - Tune your highs with the Audiophile mod, replacing the standard Orange Drop cap's creamy, vintage tone with the more clean and punchy Auricap for highs that are more transparent and open. This mods has a subtle but noticeable effect especially at higher overdrive levels.
High voltage power! 36 volts of internal power from standard 9v adapter (200mA).

True relay bypass switching with a soft touch switch providing totally quite switching and auto-bypass when power is off.

Extended highs and lows with wide-range sweepable filters.

Re-designed active level control.

Increased headroom and lower noise on all stages.

Discrete opamp upgrade option: Upgrade to studio grade dual 990 style discrete opamp for extra clarity and depth.

Knobs & Labels – Easier to read on stage.

Foundry Series MKII custom enclosure with in-set screws.

Updated internal “secret settings”.
The DRIVE control now tops out with almost 2X the original gain amount. 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.

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.
Now with IRON MKII 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.
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.

IRON MKII

PEDAL MOD UPGRADES

FEATURES

LEVEL KNOB

DRIVE KNOB

LOWS KNOB

HIGHS KNOB

CLIPPING MINI POT

CLEAN MINI POT

INTERNAL SWITCH

DIMENSIONS