Here is a vintage 1980s Yamaha DX7 Digital Programmable Algorithm Synthesizer keyboard. This particular example, serial number 51752, is in excellent all original condition and works perfectly. The DX7 is arguably one of the most popular digital synths ever produced. It featured a whole new type of synthesis called FM (Frequency Modulation). While it is not analog, the digital era gave the DX7 a whole new set of parameters for tweaking and customizing sounds. With evidence of storage wear, namely a slightly bent back panel near the corner, this keyboard is by no means a mint example, however, it is in generally good/average cosmetic condition. All membrane buttons work perfectly without issue, and all of the other hardware is in excellent functional shape.