Dating fender vt bassman cabinet
The 5D6 was a major departure from the earlier 5B6 Fender Bassman model.Designed by Freddie Tavares, longtime R&D man at Fender, Instead of the single 15" speaker, four 10" Jensen Alnico P10R speakers were used.
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 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.
The 5E6-A Bassman model was introduced later that year and included some evolutionary improvements.
In July 1957, Fender introduced the model 5F6 Bassman.