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SD-1 GT Mod

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WARNING! — The OPA2134PA opamp, of which are included in many of my kits, is currently extremely hard to find. Mouser and Digikey are currently out of stock with none expected until 2023. I have hundreds in stock. BE CAREFUL BUYING THE OPA2134PA ON EBAY. THE MAJORITY ARE FAKE! Manufacturers in China are rebranding cheaper opamps and selling them as OPA2134PA opamps. I test all my OPA2134PA opamps I buy. You can easily test whether a OPA2134PA has been rebranded. Do this, take some Acetone on a Q-tip and rub across the lettering of the opamp. If it is Fake the ink used to print the labeling will dissolve into the Q-tip.

Boss SD-1 GT DIY Pedal Mod Kits – This is my third mod for a Boss SD-1. This mod is built around a 2N3440 Transistor. A 2N3440 Transistor in this circuit, along with a few other tweaks here and there, transforms this pedal into an absolute tone monster! This mod combines the positive qualities of my first two SD-1 Mods to create an unbelievably great overdrive. The SD-808 is one of my personal favorites. Some say it’s the best SD-1 mod available. The SD-1 GT is more transparent than either of my other two SD-1 Mods. It has a very slight mid boost which helps you stand out in a mix. But the real magic happens in the upper frequencies. If you’ve ever played a vintage Script Dyna Comp or Ross compressor you’ve experienced the magic that happens in the upper range of those pedal and give them the magic that pro players rave about. That same magic is present in my SD-1 GT Mod. Note clarity is the best of any pedal mod I sell to date. My RAT 2 Fat Rat Mod comes very close but the GT has a tad better note clarity. Think early Led Zepplin Tone here.

I’ve also incorporated two switches into the SD-1 GT Mod. One switch adds presence and gain while the other switch toggles between Asymmetrical (Boss) and Symmetrical (Ibanez) Clipping. There are a ton of tonal options available here. Want clean boost. No problem. Want note articulation and clarity. No problem. Want smooth creamy overdrive. No problem. Want a combination of them all. You got it. Very versatile Mod that offers a wide pallet of tonal colors. To add a little icing on the cake I am including the extremely popular and quiet OPA2134PA Burr Brown op-amp. So, you thought the SD-808 was a great mod? Wait till you hear the GT!


IMPORTANT — Boss has started using surface-mount components on some of their new pedals. I’ve created a page to help you determine if your pedal is moddable. Read about it here.

Hear For Yourself! (.mp3s)

SD-1 GT Mod.mp3 SD-1 GT Sound Sample – This mp3 was recorded on a Strat with a DiMarzio PAF Pro at the bridge and two DiMarzio Virtual Vintage pups at the neck and middle positions. The amp was a 1975 Fender Super Reverb and the mic was a SM57. Some parts of the mp3 were recorded with the bridge pickup coil split.
Phantom.m4a SD-1 GT Sound Sample – This mp3 was graciously submitted by Simon Bowker. You can visit Simon’s Band’s website “The Fuse” by clicking here. Simon used the following gear to record “Phantom”. GT Modded SD-1, Opto Modded CS-3, TC Electronic Nova Delay, Fender American Standard Strat, an old Orange Amp from the 70s. Thank you Simon for sharing your music with us!
Mod Options

For Guitar, For Bass

LED Color

Blue, White, Yellow, Green


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SD-1 GT Mod
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