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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 P10R Jensen speakers were shipped within all Fender Bassmen from late 1954 until early 1960.
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 early 1960, Fender began producing the 5F6-A Bassman with Jensen P10Q speakers.The lowest serial number known to still exist is 0013 (Frank Roy), 0035 (Albert Talley), 0075 (Jim Cornett), 0077 (Perry Tate), 0089 (Mark Grandfield), 0701, 0745 (Walter Horton), 0769 (Hayes Kolb), 0780 (sold on e Bay Nov 2006), 0783, and 0785 (Hayes Kolb) are among those still known to exist.Fender began making other models with tweed covering, a similar open backed cabinet with a rectangular grill cloth and a narrow (just over an inch wide) tweed covered panel at the top and bottom.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.The first 4x10 Bassman amplifiers started with a batch of prototypes in November and December 1954, model 5D6.