KT88/6550 Golden Lion Premium Output Power Tube. Modelled After the the Legendary Gold Lion KT88 - the classic tube used in the Dynaco Mark III, Mcintosh MC275, and Marshall Major. Recreated Down to the Finest Detail With Gold Plated Grid Wire, Carbonized Screen Grids, and Tri-Alloy Clad Plate Structure. Delivers Exceptional Performance and Sound Quality.