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Quantum (Legacy)

Based On
Ibanez® Mostortion
Effect Type
Overdrive / Distortion
Build Difficulty
Project Summary
A reproduction of a rare and very expensive low-to-mid-gain overdrive with 3-band EQ that is popular in the Nashville scene.

Legacy PCB

Designed for the 1590B enclosure with side-mounted jacks, which some builders prefer. Bypass PCB (optional) sold separately.


In stock

Updated Version

The same circuit, but updated for the 125B enclosure format for a more streamlined build. The bypass switch PCB is integrated.


In stock

Project overview

The Quantum Distortion is a clone of the Ibanez MT-10 Mostortion MOS-FET Distortion, a fairly obscure pedal in Ibanez’s “10 series”. The MOSFET op amp that gives this pedal its name, the CA3260, is obsolete as well. This op amp is the only MOSFET component in the pedal, and there are no suitable current-production substitutes, so if you’re building a clone, you’ll have to hop on eBay and find one.

That said, the MOSFET op amp isn’t the only thing unique about this circuit and it’s still worth building even if you can’t find one—it just won’t be a MOSFET distortion. It will still have its own character whether you use the CA3260 or a JRC4558 or anything else, and who knows—you may find you like one of those better!

Along with the Marshall Guv’nor and Shredmaster, this is one of the first pedals to use a full 3-band tonestack, and the only one in Ibanez’s history.


Project Documents