It made in Taiwan 2020 and Modified in Japan 2025. Modified part_1:【IC1】【IC2】【IC3】Changed operational amplifier from JRC022D to NE5532AP. It is modified to reduce noise. Modified part_2:【C21(1μF)】【C22(1μF)】【C32(1μF)】【C12(47μF)】【C17(100μF)】The capacitors were changed to audio grade electrolytic capacitors or tantalum capacitor.
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