Model/Circuit Number: PR448 Years of Production: 2001 – 2003 Era: Pro Tube Series Configuration: Combo Controls: Black, forward facing w/ white labels Knobs: Black skirted w/ chrome center, numbered 1 – 10 Faceplate Front: Input Jack, Channel 1: Volume, Bright Switch, Treble, Bass, Mid, Channel 2: Gain, Treble, Bass, Mid, Master Volume, Channel Select Switch, [...]