This was made with reference to the circuit of the Marshall Shredmaster. The circuit board uses a quad op-amp, so it is not the early type or made in the UK. ● This is a distortion effector famous for being used by My Bloody Valentine's Kevin Shields, and Radiohead's Thom Yorke, Jonny Greenwood, and Ed O'Brien. ● It is handmade on a universal circuit board with hand wiring. ● 9V batteries can be used. ● A 9V center-negative adapter can be used for power. ● A φ5mm high-brightness blue LED is used. ● True bypass is implemented. ● The size of the aluminum case is 60 x 112 x 31 (height) mm. ● EBK is a name used only for auctions. In the original business, we specialize in blues-related equipment, such as amplifiers and effectors, and we adjust, manufacture, and adjust guitars. The number of units produced has exceeded 4000 (as of August 6, 2024), and many professional musicians use our products. ● Six-month warranty: We manage customer records, so if a failure occurs during normal use, we will compare it with the shipping records and repair it free of charge within six months. (However, you will be responsible for the shipping costs.) ● Price includes shipping. ※ Returns are not accepted except for initial operational defects. ※ This is made only as a reference, so we do not use the exact same parts. Therefore, if you want to get the exact same sound, we recommend purchasing the actual unit. ※ Please note that the decal may differ from the photo. We also have vacuum tube amplifiers and effectors for sale, so please take a look.