Ampeg SVT-II Tube Bass Amp Head Steve StevensNotes Amp was apparently previously owned by Steve Stevens, purchased from his storage locker, and is signed on the side of the amp chassis, inside wooden cabinet. Amp was serviced recently with preamp tubes replaced.. A Ampeg SVT II Tube Bass Amp Head Steve Stevens in Very Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of gear so you know exactly what you are getting. We