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Vertex Ultraphonix Overdrive Pedal

Written by

Elliot Stent

The Vertex Ultraphonix Overdrive emulates the sound of one of the world's most desired amplifiers - the Dumble Overdrive Special. With originals selling for thousands of pounds, this offering from Vertex gets remarkably close to the genuine article without the over-inflated price tag.

Designed to be used in front of a clean amplifier, the Ultraphonix delivers that sweet, musical overdrive tone that players have craved to attain without the enormous cost of the real thing. With all of the rich harmonic content you'd expect, you can adjust the top end of this pedal with the Filter control, and the amount of drive with the Gain knob.

Here's what Vertex say about the Ultraphonix Overdrive 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)
Inc. VAT

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