Crazy Tube Circuits Heatseeker Overdrive

A Nod to the "Secret" Preamps of the Seventies

The Crazy Tube Circuits Heatseeker draws inspiration from a detail often mentioned by vintage tone enthusiasts: the preamp built into certain 1970s wireless systems, known for adding presence, punch, and harmonics to the guitar signal. The idea is not to "copy" an amp, but to recapture that very rock feel: a livelier attack, mids that naturally stand out, and dynamics that make the amp seem to breathe better. Here, Crazy Tube Circuits modernizes the approach in a sturdy pedal format, designed for today's pedalboards.

Who It's For: Vintage Rock, Nervous Riffs, and Solid Tonal Foundations

The Heatseeker is aimed at guitarists who want to build a credible British tone foundation, whether in muscular clean, expressive crunch, or more generous drive. It works equally well as an "always-on" pedal to thicken the grain or as a main preamp/overdrive to energize a tame amp. In live settings, it helps cut through the mix thanks to its midrange focus; in studio, it adds an organic texture and a very immediate response to playing.

Controls, Voicings, and Integration: Simple but Highly Effective

At the heart of the Heatseeker is a fully analog JFET circuit with an internal voltage boosted to 27V via a voltage amplifier: the result is more headroom, better transient response, and saturation that remains clear. The Gain, Volume, and EQ controls allow quick shifts from a punchy boost to a meatier overdrive, while the voicing selector offers three British amp-inspired starting points. The WoS (Wall of Sound) mode enhances the sense of breadth: tighter lows, denser mids, and a wider soundstage, ideal for thick rhythm parts. Finally, the passive effects loop facilitates integrating your other pedals to maintain a coherent rig without complicating your chain.

Sound

Expect a British rock character: a clear attack, present but non-aggressive upper mids, and saturation that responds finely to your touch and the guitar's volume knob. At low gain, the Heatseeker delivers that "bigger signal" feel: more stable, denser, and livelier. Increasing the gain enriches the harmonic content, adding a warm and muscular quality reminiscent of a pushed amp, while maintaining good chord definition.

Technical specifications

Effects	Preamp, Overdrive	Type	sector
Format	Pedal	Use	electric guitar
EQ	Yes	Color	Red

Technology	Fully analog JFET circuit	Input/output	6.35 mm mono jack
Internal operating voltage	27V (via standard 9V DC power supply)	Power supply	not included
Controls	Gain, Volume, EQ, voicing selector	Required power supply	9V DC, center negative
Bypass	True Bypass	Consumption	115mA