The early models were called "Brownface" because of the dark brown color used on the control panel. The 6G6 model was covered in rough Blonde colored Tolex material with Oxblood colored grill cloth. It had a single GZ34 rectifier, two 5881/6L6GC power tubes and four 12AX7 preamp tubes. The output was 50 watts at 8 ohm into a single 12 inch speaker, with a "Tone Ring" baffle in the speaker cabinet. In early 1961, model 6G6-A was introduced with a solid state rectifier replacing the GZ34, and two 12 inch speakers with a conventional baffle in a slightly larger cabinet (wired in parallel) with a 4 ohm output. In 1962, model 6G6-B was introduced, which incorporated circuit changes but used the same speaker configuration. In 1963 smooth Blonde Tolex covering was used instead of the early rough texture cover, and a light tan grill cloth. In late, 1963, Fender changed the cosmetics to what is commonly known as the "blackface" scheme. This amp still had the presence knob and same circuit (designated 6G6-B) as the smooth Blonde Tolex Bassman, but the faceplace was now black, the Tolex was black, and the grillcloth had moved to a silver cloth with black thread. The logo had also transitioned from the flat cast tin Fender with the brown paint in the tail, to a plastic logo with faux chrome and more 3-D shape.