Music / Guitar Effects
User Manual for Electro-Harmonix Nano Big Muff Pi Distortion Pedal
Quick guide for the Electro-Harmonix Nano Big Muff Pi distortion pedal. Learn about controls, power requirements, battery replacement, and warranty information.
Table of contents
Quick guide from the manual
The Electro-Harmonix Nano Big Muff Pi is a compact harmonic distortion-sustain pedal for electric guitar. This guide provides essential information on operation, power requirements, and maintenance.
Controls
- Sustain Control: Adjusts the amount of sustain and distortion.
- Tone Control: Adjusts the frequency range from high treble to deep bass. Turning clockwise increases treble and decreases bass.
- Volume Control: Sets the overall output level.
- Footswitch & Status LED: The footswitch toggles between effect and True Bypass modes. The LED lights up when the effect is active.
Connections
- Input Jack: 1/4" jack for audio input (130 kΩ impedance).
- AMP Jack: 1/4" jack for audio output. In Bypass mode, this is connected directly to the Input jack.
Power Requirements
The pedal can be powered by a 9V battery or an optional 9VDC AC Adapter. The adapter must be center negative and capable of delivering at least 25mA (e.g., EHX9.6DC-200). The current draw is approximately 3mA at 9VDC.
Changing the Battery
To replace the 9-volt battery:
- Remove the 4 screws on the bottom of the pedal.
- Remove the bottom plate.
- Replace the battery.
- Reattach the bottom plate.
Warning: Do not touch the circuit board while the bottom plate is removed to avoid damaging components.
Warranty and Support
Electro-Harmonix offers a one-year warranty for original purchasers from authorized retailers. Register online at www.ehx.com/product-registration or return the enclosed warranty card within 10 days of purchase.
For service, contact EHX Customer Service:
- USA & Canada: 47-50 33rd Street, Long Island City, NY 11101. Tel: 718-937-8300. Email: [email protected].
- Europe: John Williams, Electro-Harmonix UK, 13 Cwmdonkin Terrace, Swansea SA2 0RQ, United Kingdom. Tel: +44 179 247 3258. Email: [email protected].
Official resources from the manual
Practical help
Common problems
No sound or effect not working
Check if the battery is dead or if the AC adapter is properly connected and providing power.
Battery replacement difficulty
You must remove the 4 screws on the bottom plate to access the battery compartment.
Power supply issues
Ensure the AC adapter is 9VDC, center negative, and provides at least 25mA.
Before use
- Ensure the AC adapter is 9VDC with a center negative plug.
- Check that the battery is installed correctly if not using an adapter.
- Connect your guitar to the INPUT jack.
- Connect your amplifier to the AMP jack.
Specs in practice
- Input Impedance
- 130 kΩ
- Current Draw
- Approximately 3mA at 9VDC
- Recommended Adapter
- 9VDC AC Adapter, center negative, minimum 25mA
Model compatibility
- Compatible with 9V battery or 9VDC AC adapter (center negative).
Manual page author
Michael Turner
Technical manual editor
Reviews PDF manuals for structure, safety notes, and practical product details so readers can find the right information quickly.