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Boss SD-1 Super OverDrive. Made in Japan, 1986. Excellent condition. This version has the magical recipe of both the 1S1558 Diodes and the JRC4558DD chip for super smooth tone with tons of even-order harmonics. The 1986 version is the best sounding of all versions. Original ACA so it uses a 12V power supply. No other overdrive pedal ever made sounds as good with a Marshall amplifier. One of the greatest overdrives of all time.
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