Fender ceased production of 5B6 Bassman amplifiers during the spring of 1954.
Only 11 of these early 5D6 Bassman examples are known to have survived.
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.
Later on, production was moved to Ensenada, Baja California, and the model name was altered to "59 Bassman LTD".
The LTD came equipped with the original 5AR4 rectifier tube, and four Jensen P10R reissue alnico speakers, which was period correct for the original amp.