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  • MXR-BA78D
  • MXR-BA78D

MXR M78 Custom Badass '78 Distortion

Huge amp-style stack tones and old-school distortion

Brand New


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Product Description for the MXR M78 Custom Badass '78 Distortion

This pedal features a hot-rodded classic circuit that roars with huge amp stack tones and old school distortion with a Crunch switch to boost harmonic content.

The MXR Custom Badass '78 Distortion is a factory-modded pedal that roars with huge amp stack tones and old school tube amp-like distortion.

We took a classic distortion circuit and hot-rodded it to the next level for over-the-top soaring leads and rich, saturated rhythms. With only three knobs, dialing in Badass tone is a cinch. The CRUNCH button allows you to choose between two different modes of diode and LED clipping, boosting the harmonic content of the distortion.

The '78 Distortion's wide open amp-like sound sounds great whether it's in front of a clean amp, a slightly dirty amp, or a full on overdriven amp. Under the hood, this high performance machine features top notch circuitry and hardware meant for a lifetime of use.



  • A hot-rodded classic circuit
  • Roars with huge amp stack tones and old school distortion
  • Delivers soaring leads and rich, saturated rhythms
  • CRUNCH button boosts the dynamic range and harmonic content of distortion


The MXR Custom Badass ’78 is powered by one 9-volt battery (remove bottom plate to install), a 9-volt AC adapter such as the Dunlop ECB003/ECB003E, or a DC Brick power supply


  • Run a cable from your guitar to the ’78 Distortion’s INPUT jack and run another cable from the 78 Distortion’s OUTPUT jack to your amplifier.
  • Set all controls to the 12 o’clock position
  • Turn the effect on by depressing the footswitch.
  • Rotating the DISTORTION knob clockwise increases the amount of distortion while rotating it counterclockwise decreases it.
  • Rotate the TONE knob clockwise for a brighter sound; rotate the Tone knob counterclockwise for a darker sound.
  • Rotating the OUTPUT knob clockwise raises the volume of the effect while rotating it counterclockwise lowers the volume.
  • Engage CRUNCH button (blue LED lit) to boost the dynamic range and harmonic content of distortion.


  • Input Impedance : 1 MΩ
  • Output Impedance : 6 kΩ
  • Nominal Input Level : -22 dBV
  • Max Output Level
  • Crunch Off : -5 dBV
  • Crunch On : -2 dBV
  • Noise Floor* : -84 dBV
  • Distortion Range : 27 dB at 500 Hz
  • Max System Gain : 43 dB
  • Tone Control
  • Tilt EQ : ± 4 dB at 100 Hz ,± 5 dB at 2 kHz
  • Bypass : True Hardwire
  • Current Draw
  • LEDs Off : 2.5 mA
  • LEDs On : 6 mA
  • Power Supply : 9 volts DC


  • CRUNCH button increases dynamic range of distortion
  • TONE knob controls the color of distorted signal
  • OUTPUT knob controls the volume of the effect
  • DISTORTION knob controls the amount of distortion
  • Footswitch toggles effect on/ bypass (red LED indicates on)
Brand MXR
Weight 0.8400
Dimensions (WxHxD) na


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