Electro Harmonix Micro Q-Tron Envelope Filter - Used AC31721 and a series of effect

and a series of effect level LEDs all add up to a pedal that can fill out the sound of a low-volume amplifier to sound its best with enhanced harmonic resonance

the 420 Fuzz is built around an EL5420csz quad op-amp

as well as a removable top and fold-up design for increased portability

With its first introduction in 1934

High-pressure Laminate (HPL) Back and Sides

Electro Harmonix Micro Q-Tron Envelope Filter - Used AC31721 and a series of effectThe Electro Harmonix Micro Q Tron brings the quirky filtering tones of its predescessors into a more compact footprint. Roll back the effect for subtle movement or punch it for wild filtering sweetness. This Micro Q Tron is in good condition and is fully functional. There pieces of Velcro attached to the back of the unit.