The Fender Bassman is pinnacle of 60's American classic rock tone. From the beginning Bassman's always shared DNA with Marshall amps, and this one can easily keep up with any JTM45 from the era. This amp is mostly original, and has changed preamp electrolytic caps, along with a few resistors. 3 coupling caps have been changed, but the tone stacks still retained their original Blue Molded Ajax caps. Other than that three tube sockets have been changed, along with the power cord.