Keeley Modded Boss SD-1 Stacked IC's and Clipping Switch Guitar Effects Pedal  

Item #: 
127474168686028438
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The Keeley SD-1 has a great tone to start with, but now every component added is of the highest quality. Metal film capacitors are used to provide the smoothest midrange and high frequency components ... Click To Read More About This Product

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Overview

The Keeley SD-1 has a great tone to start with, but now every component added is of the highest quality. Metal film capacitors are used to provide the smoothest midrange and high frequency components to your tone while increasing the bass response of the effect pedal. Metal film resistors are used in all of Keeley's changes to give the guitar pedal a consistent sound with extremely low-noise. In addition the BOSS switching has been improved making it even closer to true-bypass.

Keeley stacks two TI4558P chips for much better distortion, articulation, and transparency, while generating less noise. These two TI chips work in parallel, mounted on top of each other and soldered together.

Secondly, the Keeley Modded Boss SD-1 pedal includes a two-way gain switch that lets you select between two different diodes for the clipping/distortion section of the guitar pedal. The "down" position selects a germanium diode. The diode clips the signal more than a standard silicone diode, providing a more saturated, compressed, and smoother sound with more distortion available. The Keeley pedal's "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 symmetrical distortion. Some modifications simply take out one of the Keeley SD-1's stock diodes and call that sufficient. Keeley gives you a much wider range of professional tones.

All of the stock the Keeley SD-1 Boss wah pedal settings are still possible throughout the midrange of the control. Plus, none of the singing sweet midrange tone is gone. But you will also notice that your Keeley Boss SD-1 pedal has an improved bass response due to careful changes in the pedals design. Again Keeley used metal film caps to ensure the best tone possible.

A recommended starting point:

All Controls set at 1 O'clock, toggle "down.": good biting drive and gain.
Set the Level to 3 O'clock, Drive at 9 O'clock, and toggle switch "up," and the tone anywhere that sounds good to you. This is a good boost and great for distorting the input of a tube amp.
Set the Level to 4 O'clock, Drive off, and toggle switch "up." This is an ideal clean boost.
Set Drive to 4 O'clock and the Level to 12 O'clock and toggle switch "down." This is a super GE sustain setting. The Keeley Modded Boss SD-1 effect pedal is great for lead work that is very saturated while retaining the essence of your guitar!

Features
  • Level control
  • Tone control
  • Drive control
  • Gain switch
  • Boss rugged housing
Specifications
  • 2 - TI4558P chips (internal)
    Weight: 1.05lb
    Dimensions: 6"D x 3-3/4"W x 2-1/2"H
  • Customer Reviews
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Review Snapshot

by PowerReviews
KeeleyModded Boss SD-1 Stacked IC's and Clipping Switch Guitar Effects Pedal
 
5.0

(based on 2 reviews)

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Reviewed by 2 customers

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5.0

Classic rock sound

By chet

from detroit, MI

Comments about Keeley Modded Boss SD-1 Stacked IC's and Clipping Switch Guitar Effects Pedal:

I mostly play metal but I like to do some blues solos and this moded pedal is awesome. I want the most out of my money so I always buy the moded ones because they have a little extra something.

 
5.0

Great mod!!!

By jordan dietsche

from Minneapolis, MN

Comments about Keeley Modded Boss SD-1 Stacked IC's and Clipping Switch Guitar Effects Pedal:

this keeley mod is a great upgrade to the SD-1. it sounds much more transparent and the gain is a great "tube drive" recreation. the clipping switch gives you an option for different gain at different volume levels. much better than any stock SD-1 i've heard, and also better than many boutique drives i've heard/tried. great investment, great value, great sound!

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