Keeley Modded Boss SD-1 Super Overdrive Effects Pedal

Keeley Modded Boss SD-1 Super Overdrive Effects Pedal (Pre-Owned)

Product code: bst2uksd1kmod

The Keeley 5 Star Germanium modification adds a switch so you can choose between germanium diodes or LED clipping stages for fantastic flavours of overdrive and an overhauled buffer for no tone loss when the pedal is turned off! Boxed, in Excellent condition and with blue LED, too!.


  • Keeley Modded Boss SD-1 Super Overdrive Effects Pedal (Pre-Owned)

    The Keeley 5 Star Germanium modification adds a switch so you can choose between germanium diodes or LED clipping stages for fantastic flavours of overdrive & an overhauled buffer for no tone loss when the pedal is turned off! Boxed, in Excellent condition & with blue LED, too!


    Robert Keeleys 5 Star Ge mod for the SD-1 includes a two way gain switch that allows you to select between two different diodes for the clipping/distortion section of the pedal. The 'down' position selects a germanium diode (the 'Ge' part of the name). The Ge diode clips the signal more than a standard silicone diode, providing a more saturated, compressed, and smoother sound with more distortion available. The 'up' position selects an LED for the clipping section, which clips less, allowing a clearer, more 'open' sound, with less compression, more dynamic response, and more output available. Both are asymmetrical and both are an attempt to make the pedal more 'tube-like' since tubes and transformers rarely produce a symmetrical distortion.

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    NOTE, this is not just a switch to make it like a TS9 as some folks do. This makes it MUCH fatter, cleaner, and more defined, AS WELL AS gives it another mode to increase the gain beyond what a stock SD-1 offers!

    NEW BETTER BYPASS! Keeley modify the BOSS switching making it even closer to true-bypass! In stock form, these units may suffer a bit of bleed through when off if the level and gain are set very high. No longer! We now have the best sound pedal both on and OFF!

    This pedal is a key element to many heavy rocker's tone. It's like the TS9 with more transparency and more edge. If you are looking for something in the Tube Screamer vein, but with a little more hair on it, not as much midrange push, this is it! Plus, this mod has got a Germanium diode in the clipping section as a standard part of the mod! The Super Overdrive, GE***** 5 STAR MOD! You saw it here first! Complete with metal film capacitor and resistor upgrade. Increased Bass, Drive, and Fidelity!

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  • Additional Information

    Brand Keeley
    Condition Pre-owned

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