MOSTLY MUSIC CERTIFIED INSPECTION

This Electro-Harmonix Hum Debugger was pulled from our floor inventory and thoroughly tested by our team. We checked the bypass switching, the hum-cancellation circuit, power draw, and overall functionality. It works exactly as it should.

THE PEDAL & WHAT IT DOES

The Electro-Harmonix Hum Debugger is a specialized tool built to kill 60Hz hum and electrical interference that single-coil guitars are famous for picking up—especially in high-gain rigs, older venues with questionable wiring, or when you’re recording direct. It doesn’t act like a traditional noise gate that chops off your sustain. Instead, it uses a clever cancellation circuit to target the hum while leaving your guitar tone and dynamics intact. It’s one of those pedals that quietly solves a problem a lot of players fight with every night.

TECHNICAL SPECIFICATIONS

• Power Requirement: 9V DC center-negative (standard pedalboard supply, not included)

• Controls: Single “Hum” knob that lets you dial in the exact amount of cancellation you need

• Switching: True bypass for completely transparent tone when the pedal is off

• Chassis: Tough metal with the classic EHX green-and-black look

• Current Draw: Very low—easy on any pedalboard power supply

CONDITION & COSMETICS – OUR BUY-IN REPORT

Rated Very Good condition. The pedal shows only light, honest signs of careful use. There’s a piece of Velcro on the back from previous board mounting. The graphics are clean, the knob turns smoothly, and there are no major dents, scratches, or issues. We photographed it clearly so you know exactly what you’re getting.

PERFORMANCE & SOUND NOTES FROM OUR TESTING

Tested with single-coil guitars in both clean and high-gain setups. It knocks down that annoying 60-cycle hum without sucking the life out of your tone when you find the right spot on the knob. The cancellation is musical—your note bloom and dynamics stay right where they should be. It’s especially handy when you’re stacking drives or recording, where hum tends to get magnified. Bypass is dead silent and transparent, just like you want from a utility pedal.

WHAT’S INCLUDED WITH THIS PEDAL

Electro-Harmonix Hum Debugger in the Very Good condition described. Ships with the pedal only—no power supply or original box.

MOSTLY MUSIC USAGE TIPS & REAL-WORLD APPLICATIONS

This is one of those “set it and forget it” pedals that quietly makes your life easier. Perfect for Strat and Tele players who gig in small venues or older buildings where the power is noisy. Home recordists love it because it cleans up the signal before it hits the interface. It plays nice on a pedalboard, draws almost no current, and doesn’t color your tone when it’s doing its job. If you’ve ever spent ten minutes chasing ground hum before a gig, you’ll appreciate what this little green box can do.

WHY BUY FROM MOSTLY MUSIC

We’re not just moving gear, y'all. We’re players who opened a store because we know this stuff inside and out. This listing is transparent because that’s how we operate. You’re getting a fully functional Electro-Harmonix Hum Debugger with honest condition notes, real testing from working musicians, and practical advice from folks who actually use this kind of gear on stage and in the studio. Questions? Message us anytime. We actually get it.