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Aion FX Refractor Professional Overdrive

$Aion FX Refractor Professional Overdrive main image$ $Aion FX Refractor Professional Overdrive image 2$

$Aion FX Refractor Professional Overdrive$

Aion FX Refractor Professional Overdrive

5.0 (1)

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Page last updated Oct 26, 2025

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Description

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A part-for-part replica of a mythical overdrive effect noted for its high-end tone and price. The Klon Centaur and its successor, the KTR, remain highly original designs in an industry full of clones and tweaks to existing circuits.

The Refractor Professional Overdrive is a clone of the Klon® Centaur Professional Overdrive and its successor, the KTR.

While the original Centaur was buffered bypass, the newer KTR added the option to switch between buffered bypass (called “Almost Always Better” by the designer) and true bypass (called “Almost Always Worse”). There were an overwhelming number of requests for this to be added to the Refractor, so this updated version implements the switch.

As of its release, the Refractor is the only DIY version of the Centaur or KTR that uses the correct true/buffer switch wiring from the original unit. Several other projects use a simpler wiring method that does not preserve the original circuit in buffered mode, which was one of the inventor’s stipulations.

Aside from the addition of the true bypass / buffer switch, the KTR is identical to the original Centaur circuit except for two components:

A pulldown resistor, RPD, has been added to counteract switch pop in the true-bypass mode.
R2 has been changed from 1M to 2M so that the input impedance stays the same with the addition of RPD (since two 2M resistors in parallel make 1M, which was the original value).

Product specs

Power	9V
Bypass	true bypass
Analog/Digital	analog

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R.J. Ronquillo

Aion FX Refractor Professional Overdrive - Klon Centaur / KTR Clone

$Video thumbnail for Aion FX Refractor Professional Overdrive - Klon Centaur / KTR Clone by R.J. Ronquillo$

Aion FX Refractor Professional Overdrive - Klon Centaur / KTR Clone

R.J. Ronquillo

$Video thumbnail for Refractor Professional Overdrive by Aion FX$

Refractor Professional Overdrive

Aion FX

$Video thumbnail for Aion FX Refractor Kit - Realtime Build by Aion FX$

Aion FX Refractor Kit - Realtime Build

Aion FX

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Aion FX Refractor Professional Overdrive.

Features and functionality

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The Aion Refractor includes a switch for true bypass to buffered bypass, mirroring the functionality of the Klon KTR.
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The resistors in the Aion Refractor are custom-made for Aion kits, adding a unique touch to the pedal’s design and performance.
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Build quality

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The kit features custom high-end red resistors with values printed on them, sourced specifically by Aion FX.
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Users note the clean and professional finish of the Refractor, with some opting for custom graphics using waterslide decals for a personalized look.
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Owners appreciate the clean cable management in the Aion Refractor builds, contributing to a tidy and professional interior appearance.
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User experience

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Builders appreciate the inclusion of ribbon cables and on-board components, simplifying assembly and disassembly.
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Owners appreciate the aesthetic appeal of the pedal, often receiving compliments on the knobs and overall design.
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Aion Refractor's pre-designed enclosures save time for builders, allowing them to focus more on assembly and sound rather than exterior design.
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Use cases and applications

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Owners find the Aion Refractor to be a standout addition to their pedalboards, often becoming a favorite due to its engaging build process and sound quality.
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The Refractor is praised for its sound quality, with builders expressing satisfaction upon completing the project and integrating it into their setups.
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Other

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All components, including the enclosure, are provided in the kit, though specific sourcing details are not disclosed.
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5.0 out of 5

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remdef

253

over 5 years ago

A really good clone

Obviouisly, I can't say if it sounds like the original, but at the end, it's a really great overdrive. Sounds amazing as a clean boost, it can enhance the sound of any drives put after it.

Roles:

Singer Guitarist Composer

Genres:

Rock Pop Indie pop

Artist usage

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$See how Wayne Sermon uses Aion FX Refractor Professional Overdrive$

Wayne Sermon

Guitarist, Keyboardist

Imagine Dragons

Verified via Aion Electronics

Wayne Sermon uses the Aion Refractor Professional Overdrive, as detailed in the Aion Electronics Build Reports. Kevin, the owner of Aion Electronics, custom-built this overdrive pedal for him, inspired by the Klon Centaur design.