Jam Pedals releases Rattler Mk.2 with custom op-amp and mid-boost

March 17, 2025 · 3 sources

Jam Pedals has released the Rattler Mk.2, an updated version of its RAT-style distortion pedal, according to Delicious Audio, which published its report on March 17, 2025¹. Guitar World reported the pedal earlier, on July 22, 2024, saying it was available to order for $249 with worldwide shipping².

The Mk.1 used the LM308 chip found in vintage RATs, which Delicious Audio describes as now almost impossible to find; for the Mk.2 the Jam team designed its own custom op-amp that, the report says, delivers the same tube-amp character as the original¹. Guitar World describes an all-new circuit design and custom op-amp, and notes that the LM308 chips that powered the original ProCo RAT and the Rattler Mk.1 have been replaced².

The Mk.2 adds an extra footswitch and a 2-way toggle. The footswitch engages a mid-boost circuit placed before the distortion, and the boost's frequency is set with an internal trim pot that affects level and bass content¹. The toggle selects between the original asymmetrical clipping and a new symmetrical voice¹². Like the RAT, it has three knobs: Level, Gain and Tone². Internal controls set output level and bass response, and the boost trimmer is factory-set at its highest setting². Guitar World also lists click-less footswitching and true bypass².

Guitar World gives the US price as $249, with a special "Borealis Window" version at $319². Guitar Pedal X lists the pedal at $249 and describes its controls as Level, Gain, Tone, a Clipping switch for asymmetrical or symmetrical, a Mid Boost footswitch and a Bypass footswitch³.