Dr. No Effects KUKULCAN

The Dr. No Effects KUKULCAN is a limited edition preamp pedal with three stacked gain stages that push the signal into natural clipping. Dr. No describes it as "a triple-stage powerfull preamp that pushes the signal into natural clipping," built around three of the maker's own custom transistors, the Skullsistors¹. The idea came from a single song: the "broken" guitar sound in "Annihilation of the Spirit" by Masters of Reality, which Dr. No calls the starting point for the pedal and a tribute to the track¹.

What makes it unusual is that each gain stage is completely independent. Instead of one circuit with three stacked stages, the KUKULCAN decouples them into three separate gain stages, each with its own circuit activation footswitch and its own gain potentiometer¹. You can run it mild and mellow with one stage, or stack all three for what the maker labels, in escalating weather terms, "Rain," "Storm," and "Earthquake"¹.

The controls and footswitches

The control scheme is the heart of the pedal. Each of the three gain stages gets its own pair: a circuit activation footswitch and a gain potentiometer¹. The footswitch colors act as a code, matching the corresponding light on the pedal, so you can see at a glance which stages are active¹.

The stages are labeled by intensity¹:

Even the knobs are a custom job. Dr. No found that the knobs he envisioned did not exist, so they were sculpted and cast exactly as imagined, and the in-house made knobs get a flock layer³. The housing is coated and the design silkscreened by Dr. No, with the KUKULCAN print on the front flocked³.

The pedal also carries a built-in power noise filter, which Dr. No added to eliminate the power supply noise often related with preamps¹.

Skullsistors and the circuit

The KUKULCAN's circuit is built as three separate single gain stages, each with its own circuit activation footswitch and gain potentiometer, stacked one after another¹. Dr. No's original prototype used a single circuit with three stacked gain stages, but it generated an overwhelming amount of distortion and proved too potent and uncontrollable, so the design was reworked in 2025 into three separate stages⁴. Integrating the stages "took more effort and time than expected," according to Dr. No's build update³.

The circuit went through a major redesign on the way to production. The original prototype was a single circuit with three stacked gain stages, but it generated an overwhelming amount of distortion that rendered it too potent and uncontrollable. In 2025 it was redesigned as three separate gain stages, the layout that shipped⁴.

Dr. No describes the result as "a unique, one-of-a-kind natural signal exaggerator, ranging from mild and mellow to its maximum extreme," generating a previously unheard tone without changing the character of the guitar, hand and amp¹.

A numbered limited edition and how it was designed

The KUKULCAN is a strict limited edition: handmade in two series of only 50, with a total edition of 100 handmade numbered and signed copies¹. A new last series of 30 was later built by reservation¹.

The series timeline¹⁴:

The first 50 handmade copies were released on February 28th 2026, with shipping starting March 5th 2026¹. Dr. No had been working around the clock to get the first series of 50 ready by the end of February³.

Number one of the edition, the KUKULCAN NO 1/100, is a special case. It is the first build of the pedal, numbered 01/100, and it lives in Dr. No's Analog Imaginarium as a unique display build, not for sale⁵. It was listed at 575.00 EUR, and the exact unit shown in the product photos is the one offered⁵.

Availability and price

The pedal was handmade in two series of only 50, and a final series of 30 was handbuilt by reservation only; reservations were made by contacting Dr. No at info@drno-effects.com or via the contact form on the website¹.

The list price on the Dr. No webshop is 372.00 EUR¹, which Guitar Pedal X reported in March 2026 as "$439" USD².

What reviewers said

Guitar Pedal X's Stefan Karlsson covered the pedal at launch, noting its triple-stacking transistor gain stages and Skullsistor design. His verdict on the overall design and usability²¹³:

So the trade-off a player weighs: three separate footswitches and gain knobs make it playful and interactive, but less board-friendly than a single-box preamp².

Questions