B-Stock refers to units that were previously used as demonstration units, press review samples, or temporary replacement units. After being returned to us, each unit is thoroughly tested, fitted with new tubes, and fully recalibrated. In terms of technical performance, B-Stock units fully comply with our factory specifications and are covered by the same warranty terms as all other products manufactured by Gainlab Audio. You can read about this terms here. However, their cosmetic condition may show signs of previous use resulting from normal handling. These may include wear around the rack-mounting ears, polished or shiny areas, minor scratches on the front panel caused by operating the controls, or light marks on the chassis from being installed in and removed from a rack. All B-Stock units are shipped in original factory packaging, and any included software product licenses remain fully valid and can be activated as usual.