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This final 1950s Tweed Bassman model product line included a change from the 83 mercury vapor rectifier tube to the GZ34 rectifier tube, as well as a modification within the Presence control circuit.During early 1960, Fender began producing the 5F6-A Bassman with Jensen P10Q speakers.The P10Q Jensen speakers are more able to manage stronger electrical input power and generate better "clean" output sounds than previous installed P10R Jensen speakers.
The power amp included a "long tailed pair" phase inverter, an innovation that noticeably increased the "headroom" or clean power output capability of the amplifier.
The 5E6-A Bassman model was introduced later that year and included some evolutionary improvements.
In July 1957, Fender introduced the model 5F6 Bassman.
5B6 Bassman amplifiers had two 6SC7 or 6SL7GT pre-amp tubes, two 5881 power tubes and a single 5U4G rectifier tube.
It was designed to generate 26 watts at an 8 ohm impedance load, and offered a cathode-based bias.
The 5D6 was a major departure from the earlier 5B6 Fender Bassman model.