The CKK SHXC Super Overdrive is a hand-made Klon-style overdrive pedal built in China by CKK Electronic, the workshop of builder Mr. Wu behind the Sinvertek name. Rather than clone the Klon Centaur, Mr. Wu redesigned the circuit from scratch, using new-old-stock germanium diodes sourced for sound and an ultra-rare TL072 opamp. It is a small-batch pedal: no more than a few hundred copies will be built, and the only way to order one is to email Mr. Wu directly1.
Circuit and design
As for what that means for the sound, Delicious Audio describes the SHXC as extending the original's tonal range and delivering a more detailed, dynamic and rich tone in all the frequency ranges1.
Controls
| Control | What it does |
|---|---|
| Level | Output volume |
| Tone | Treble character |
| Drive | Amount of overdrive |
| Buffer | On/Off switch for the pedal's buffer stage |
Guitar Pedal X listed the controls in its 2025 review as "Level, Tone, Drive, Buffer : On/Off"2. The Buffer switch lets a player take the pedal's buffer stage out of the circuit, which matters on a crowded board where stacking buffers changes the feel of the signal chain.
Availability and price
The SHXC is not a normal retail product. Delicious Audio reported at its October 2023 introduction: "Right now the only way to order a CKK SHXC Super Overdrive is to email Mr. Wu at officialsales, at -sinvertek.com."1 Guitar Pedal X listed it at $350 in its September 2025 Klon-variants roundup2.
Production is capped: "no more than a few hundred copies of this pedal will be built," according to Delicious Audio1. Once the run ends, the pedal will only exist secondhand.
What reviewers said
Delicious Audio reported that the pedal was "getting great reviews from the handful of tone connoisseurs who were able to put their hands on a review unit"1. Guitar Pedal X's Stefan Karlsson included it among Klon-style pedals in his 2025 Kapsule Collection, listing it at $3502.
The SHXC sits in a small family of hand-made CKK overdrives covered elsewhere on this site, including the CKK SH-1N Scream Honey Gold Edition, the CKK Scream Honey Overdrive and the CKK Lunar OD Special.
Videos
Pete Thorn
The Studio Rats
Michael Nielsen - Big Hairy Guitars
Questions
How do you buy the CKK SHXC Super Overdrive?
As of its 2023 introduction, the only way to order one is to email Mr. Wu at CKK Electronic directly. The pedal is not sold through normal retail channels, and Delicious Audio reported that email ordering was the sole route at launch. No more than a few hundred copies will be built, so availability depends on whether production is still running when you write.
How many CKK SHXC Super Overdrives will be made?
Delicious Audio reports that no more than a few hundred copies of the pedal will be built. It is a small-batch, hand-made pedal rather than a mass-produced product, so units are scarce and the run is finite.
What does the Buffer switch do on the SHXC?
The SHXC carries a Buffer On/Off switch alongside its Level, Tone and Drive controls, as Guitar Pedal X noted in its 2025 review. It lets the player choose whether the pedal's internal buffer stage stays in the circuit, which matters for how the pedal interacts with the rest of a pedalboard's signal chain.
What diodes does the CKK SHXC use?
The SHXC uses new-old-stock germanium diodes, which builder Mr. Wu sourced specifically for sound, paired with what Delicious Audio describes as an ultra-rare TL072 opamp. Germanium clipping is a defining part of the Klon-style circuit this pedal re-engineers.
Where is the CKK SHXC Super Overdrive made?
The SHXC is hand-made in China by CKK Electronic, the builder behind the Sinvertek brand. Delicious Audio introduced it in October 2023 as a new, hand-made Klon variant from that workshop.
Sources (2)
- CKK SHXC Super Overdrive (Klon Variant), Delicious Audio, 2023-10-03
- Guitar Pedal X, Guitar Pedal X, 2025-09-03
