Mesa / Boogie Mark IV combo Series A with Electro-Voice

This amp should need no introduction. Three channels, 85 watts max output but with several lower-power options. Made circa 1991, "Series A" model. It's got a lot of power, a lot of features, and weighs over 80 pounds: this is NOT a beginner's amp, but you will never outgrow it. JJ 6L6 p...