Posted by
Nov 14, 2018

The Vertex Ultraphonix is an overdrive inspired by the sound of the legendary and ultra-rare Dumble Overdrive Special amps. It was built using four of those amps built between 1970 and 1990 as a reference.

Here are a few recent videos of this pedal:

The Ultraphonix Overdrive is designed to re-create the overdrive produced by a Dumble™ Overdrive Special amplifier. Using a sample size of four generations of Overdrive Special amplifiers from 1970-1990 to voice and calibrate the pedal, the Ultraphonix is more than able to provide the D*style overdrive to any clean amp platform.


Voiced alongside four Dumble™ ODS amps ranging from 1970’s-1990’s
Quintessential D*style tone, note bloom, & harmonic overtones
100% Analog Circuitry
Mechanical “True Bypass” Switching
Designed & Assembled in California
9VDC center-negative power operation (adapter not included)