1960s Ampeg Portaflex Model SB-12, Used

The Ampeg Portaflex line revolutionized bass amplification, putting top-tier bass tone into a portable package.  The SB-12 was originally developed to be a partner to Ampeg's upright "Baby Bass," but has been a favorite studio tool of bass guitar players the world over as well.  The simple layout makes it easy to dial in an excellent tone, and the flip-top construction means you won't have any trouble getting it to the studio or the gig.