PreSonus MP20 Microphone Preamp Class A Discrete 2ch The unit and power cord will be shipped. Original price: 173,250 yen There are many scratches on the back from rack mounting, but the front and top are clean. There is occasional crackling, typical of the vintage MP20, but it resolves with use. This is a late 2003 model and does not have Jensen transformers. "IDSS" is a function that allows you to fine-tune the distortion components in the harmonics of each channel between 0.001% and 0.5%, which allows you to simulate the saturation of vacuum tubes and analog tape. It also functions as a 2-channel mixer, which is very convenient for recording acoustic guitars, etc. It also has pan controls. Each channel has inserts, HPF, +48V, and a 20dB PAD. #presonus #micpreamp #MP20