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Horizon Amp Overdrive

Based On
Catalinbread® DLS Mk.I
Effect Type
Build Difficulty
Project Summary
An “amp in a box” drive pedal inspired by the sounds of 1970s Marshall amplifiers.
Horizon Amp Overdrive printed circuit board

Printed Circuit Board

What's included?
PCB only. Build instructions and parts list can be viewed or downloaded from this page.


In stock

Complete Kit

Not yet available.
Kits are developed based on interest, so if you’d like to see one for this project, let us know.
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19 people are interested.

Project overview

The Horizon Amp Overdrive is a recreation of the Catalinbread Dirty Little Secret Mk I, a unique drive pedal that resembles a Marshall amp stack in its response and tone.

The DLS Mk I was the first of three versions, and is often considered the best—or at least, different enough that subsequent versions should have been released as new pedals. They share some DNA in common, but they have very different tonestacks and tweakability.

The DLS circuit uses cascaded mu-amps as a foundation. There are no op-amps or clipping diodes. The clipping signal is generated entirely by the JFETs, giving it a different flavor than diode-clipping-based overdrives.