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Purchase the Boss SD-1 Modification Sheet
On this page you can purchase the Fuzz Central Boss pedal moficiation information for the SD-1
Super Overdrive and the DS-1 Distortion. Each information packet is a PDF download that contains four pages. Page one
is the modification reference table that lists the number of the part on the circuit board, the original part value, the
modified part value, and the part number that you can use to order from Digikey.
Page two is a table the explains what the modifications do in the circuit and it also includes a picture of an SD-1 with a modified
circuit board. The third sheet is a schematic of the pedal as it comes out of the box...completely unmodified. The fourth and final
page is the modified schematic of the pedal, with the modified parts highlighted for easy reference. You will need Adobe Acrobat Reader
installed on your computer to view these PDF files.
The Boss SD-1 Super Overdrive is one of the premier Overdrive pedals that's currently being
manufactured. It's also probably one of the best overdrive pedals that's ever been manufactured by any company.
(In my opinion, it's hands-down the best overdrive bang for the buck!) It's about half the price of an Ibanez TS-9,
and it's also quite a bit more durable, especially the switch that controls the JFET electronic switching of the
pedal. Here's the description of the SD1 from the Boss website:
"Provides warm, smooth overdrive tones that respond to your picking style the way a tube amp does, even at low
volume levels. Exclusive BOSS asymmetric overdrive circuitry delivers a genuine overdrive effect for a classic
guitar sound."
Believe it or not, the SD-1 actually lives up to the manufacturer's description, and then some! But like most mass-produced
effects pedals, there's room for improvement. The manufacturers tend to use the parts that they can acquire the most
of for the lowest cost, which usually means that they aren't the best sounding parts that could be used in the circuit,
but they're good enough to make a lot of people happy...but the advanced guitarist will want more from the circuit. By performing
the modifications provided in my SD-1 modification sheet, your SD-1 will have a warmer tonal response, a wider overdrive range (more aggressive
at extreme settings) and a lower noise floor.
A great deal of time and energy went into acquiring the Boss pedals (money out of my own pocket), and then carefully tracing out
the circuit board to generate a completely accurate schematic of the pedal, including the Boss trademark JFET electronic switching.
After running Fuzz Central as a completely free site for 4 years, I thought that it wouldn't be imposing on my regular visitors to
ask a small amount for these great, fully functioning modifications.
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Purchase the Boss SD-1 Super Overdrive Modification Sheet
$8.00
Be sure to include your email! The modification sheet will be emailed to you
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Important! Please read this before purchasing!
These modifications are to be performed only by persons experienced with effects pedal modification.
The SD-1 is a complicated pedal, so it's easy to make mistakes and damage the circuit board with a soldering iron. I DO NOT
provide technical support for these modifications. They work perfectly, as I have performed them on my own pedal, but I make
no warranty or guarantee. Due to the complicated nature of the Boss circuit boards, I have to label these modifications as
"perform at your own risk."
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