Based on the BOSS OD-1 circuit diagram, I've created a quad op-amp version with true bypass. This version improves the low volume issue that was a drawback of the original. The op-amp used is the NEC μPC4741C (UPC4741C), which was also used in the original. These are NOS (New Old Stock) parts, so they will be replaced when the stock runs out. This is a handmade product. No printed circuit board is used; each part is point-to-point wired. The black case version is available for an additional 500 yen. Please inquire about other colors. Power: 9V center negative (battery not supported) Top Left Knob: LEVEL Bottom Right Knob: OVER DRIVE Right Jack: in Left Jack: out Size: Equivalent to 1590A, approximately 92.5(D) x 38.5(W) x 31(H) mm Op-amp: NEC μPC4741C If you have any requests regarding the case or LED color, or case size, I may be able to accommodate them, so please consult separately. #guitar #overdrive #effector #distortion #TAeffects