This is a Japanese-made DS-1 from 1980, which debuted in 1978. It has a 9700 serial number and silver screw specifications. It has the old circuit specifications, different from the current model. The IC is Toshiba's TA7136AP. Operation has been confirmed. The pots were cleaned before listing, and it has been confirmed that there is no noticeable scratchiness and the output is good. Some of the control knobs have been replaced. Although there are some scratches on the exterior, the condition is good compared to other units from the same period! It has the best sound! Please consider it. Accessories None