BLUES JUNIORTM INTRODUCTION The Fender Blues Junior is a truly professional, small, tube amplifier. A true classic, with that late-night blues tone found nowhere else but in a Fender. Compact size, professional tone, and traditional styling make the Fender Blues Junior ideal for rehearsal, backstage warm-up, and studio work. The Blues Junior’s top panel mounted controls offer both simplicity and versatility: Volume, Treble, Bass, Middle, Master, “FAT” switch, and Reverb.