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Several Bassman models were progressively influenced by the 5D6 through the last Fender Tweed 5F6-A Bassman's circuit design.
The 5F6-A Bassman's design was directly copied by Marshall Amplifiers within their JTM-45 amplifier during the early 1960s. The first series of the reissue were made at the Corona, California facility, and came equipped with four Eminence-made 10" blue frame Al Ni Co speakers, and a solid state rectifier unit.
Similar preamp changes were also incorporated in the 5F8 Twin Amp at about the same time, but not on other large size Fender amps.
During 1958, Fender introduced the model 5F6-A Bassman model.
The circuit had two innovations: a fixed bias for the power tubes, which increased power in comparison to the earlier cathode bias design, and a cathodyne phase inverter, using half of the 12AX7 tube and allowing a third gain stage on the other half.
Designed by Freddie Tavares, longtime R&D man at Fender, Instead of the single 15" speaker, four 10" Jensen Alnico P10R speakers were used.
In late 1960, Fender introduced a completely redesigned model 6G6 Bassman Amp, using the "piggy-back" design, in which the amplifier chassis is housed in a small cabinet, attached by metal clips to a larger separate speaker enclosure.
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.
with a front panel that had a rectangular grill cloth with rounded corners and looked much like a television of that era.