TMH003B Gamechanger Audio Plasma Coil Pedal 

The TMH003B Gamechanger Audio Plasma Coil Pedal is a special collaboration between Gamechanger Audio and Third Man Records, representing one of the most genuinely novel pieces of guitar hardware to reach the market in decades. Rather than relying on conventional transistor or op-amp circuitry, this pedal takes a fundamentally different — and dramatically more electrifying — approach to distortion, one rooted in actual high-voltage electrical discharge. It is a pedal built not just to sound extreme, but to literally be extreme, in the most scientifically literal sense possible.

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High Voltage Distortion Technology

At the heart of the Plasma Coil is Gamechanger Audio's innovative High Voltage Distortion technology, which expresses audio signal as a series of electrical discharges. The device literally amplifies the audio signal to 3,500 volts — making it the first and only commercial musical device to do so. The result is a distortion character that no conventional clipping circuit can replicate: raw, unpredictable, and viscerally physical. The PLASMA Tube itself is filled with Xenon gas, and the electrical arcing within it is not a metaphor — it is the actual sound-shaping mechanism at work.

The COIL Distinction: Effects and Octave Circuitry

What separates the Plasma Coil from the original Plasma Pedal is its expanded sonic palette. The Plasma Coil takes High Voltage Distortion to new heights by adding multiple Octaver-style circuits and an additional Effects footswitch that can be toggled as either latching or momentary. The EFFECT knob allows the player to select from six different special effect types: a Volume Boost, two Subharmonic modes (Bitcrush-style Octave Down), one Upper Harmonic mode (Octafuzz-style Octave Up), and two Mixed modes combining upper and lower harmonics. This transforms the pedal from a one-dimensional distortion box into a multi-dimensional tonal weapon.

Signal Purity and Control

Another key difference from the original Plasma Pedal is the removal of the BLEND control — with the Plasma Coil, the signal is always 100% PLASMA, take it or leave it. For players who want total commitment to the effect, this is a bold and purposeful design choice. Additional controls include two EQ knobs for boosting or cutting low and high frequencies, a Master Volume knob, and a Voltage knob that adjusts the amount of electrical current sent to the PLASMA Tube. Together, these controls give players meaningful shaping ability within an otherwise uncompromising signal path.

Why Our Gear Experts Appreciate the TMH003B

Our gear experts are drawn to the TMH003B because it offers something no conventional pedal can — distortion generated through actual electrical discharges at 3,500 volts , producing a texture that is organic yet alien. The six selectable effect modes, spanning subharmonic octave-down to octave-up and combined harmonic modes , give players an enormous creative range. The commitment to a pure, unblended PLASMA signal appeals to artists who want total sonic conviction, not compromise.

Top Ten Features

• High Voltage PLASMA Distortion circuit that converts audio signal into electrical discharges at 3.5 kV
• PLASMA Tube filled with Xenon gas
• Six selectable special EFFECT types via EFFECT knob
• Two Subharmonic modes (Bitcrush-style Octave Down)
• One Upper Harmonic mode (Octafuzz-style Octave Up) 
• Two Mixed modes combining upper and lower harmonics 
• EFFECT Footswitch configurable as latching ON/OFF or Momentary 
• Two EQ controls for boosting or cutting LOW and HIGH frequencies
• VOLTAGE knob to adjust the amount of electrical current sent to the PLASMA Tube
• Silent ON/OFF footswitch