Oberheim DX For Sale. We paid our tech for over 8 hours of his time to lovingly refurbish this unit in an attempt to futureproof it so that it will hopefully outlast all other DXs out there. This unit was disassembled and cleaned inside and out.The battery was replaced with a new one. All pads were opened and contacts were cleaned. The power supply capacitors were replaced to hopefully extend its life. All faders were replaced with brand new ones. This unit was tested thoroughly and is in excellent working order. This significant investment of time and money and the fact that this unit should work better than most if not all other DXs on the market is of course reflected in its relatively high price.