Overview: Developed during the mid '70s as an evolution of the former 'Super Bassman' and later 'Bassman 100' models, the Bassman 135 was released in 1977 and looked outwardly similar to it's predecessors albeit with a few revisions. The new model claimed more power with less distortion thanks to an ultra-linear output configuration plus extended tonal variations thanks to a new mid control on the 'bass' channel. Allied to the high powered 4-valve 135, a smaller, two-valve, lesser featured