Crazy Tube Circuits is a boutique guitar pedal company based in Athens, Greece, founded by Christos Ntaifotis — an amp enthusiast and vintage tube collector whose friends nicknamed him the "Crazy Tube Guy." The company designs and hand-builds all-analogue effect pedals with a focus on capturing the warmth and feel of classic tube amplifiers. Their tagline, "Just Insane Tone," reflects a design philosophy rooted in "amp-in-a-box" drives that emulate legendary guitar rigs, along with time-based effects spanning reverb, delay, and modulation.

The lineup includes standout pedals like the Unobtanium (combining Klon-style and Dumble-voiced drive circuits), the Falcon, the Crossfire, the TI:ME delay, and the White Whale V2 (featuring genuine spring reverb and analog tremolo). The Starlight fuzz/distortion was one of the brand's earliest designs, originally called "Dr Boogie" before being renamed "Black Magic" and eventually becoming the Starlight. Despite the name, most Crazy Tube Circuits pedals don't contain actual tubes — the exception being the Space Charged Overdrive — but the goal is always to deliver the organic response and harmonic richness of real valve amplifiers.

Crazy Tube Circuits pedals have found favor with a wide range of professional guitarists, including Billy Gibbons, Peter Frampton, Brad Whitford, Nels Cline, Lee Ranaldo, Dweezil Zappa, Doug Aldrich, Bill Frisell, James Valentine, and Pete Thorn, among others.

Crazy Tube Circuits has 55 products cataloged on Equipboard, including Overdrive Effects Pedals, Reverb Effects Pedals, and Fuzz Effects Pedals. Their gear is featured by 16 artists, with the strongest followings in Rock, Jazz, and Folk, World, & Country. Notable users include David Hidalgo, Nels Cline, and Pete Thorn. Crazy Tube Circuits's catalog spans the full price spectrum — from entry-level options to high-end flagships.