The late-'50s tweed-covered Fender Bassman is often called the grandfather of all guitar amps. What started earlier that decade as the companion amp for the Precision Bass actually became one of the most beloved guitar amps of all time, thanks to its simplicity and versatility, its wide dynamic range and warm tube overdrive, its full-frequency stage-filling power and its rugged roadworthiness.
Fender tweed amps evolved into the brown, blonde, blackface and silverface models of the 1960s. Along with the dramatic evolution of their look, the amps were redesigned each time to sound brighter and cleaner. New Bassbreaker Series guitar amplifiers continue that fascinating lineage with yet another sound and style, a kind of "parallel evolution" in which time-honored Fender amp DNA results in a satisfyingly dirtier tone that evokes the dawn of hard rock.
The new series takes the 45-watt 1959 Bassman design and breaks it with features including the early Fender block-letter logo, black tweed covering, and refined pointer knobs plus power tubes hinting at the U.K. amps that "borrowed" Fender circuits in the 1960s. The sound is one of pure and unadulterated tube greatness.
If I recall correctly, the old Bassman served as inspiration for the Marshall JTM-45.
The full product lineup is here: http://www.musiciansfriend.com/fender-bassbreaker?src=3TP5L5A