Mesa Boogie 5U4GB Rectifier Tube (Individual) Instru which is a wide range

which is a wide range drive pedal based around the rotation of a clipping network into different locations in the circuit

dirtier clockwise

with classical yet modern specifications

turn counterclockwise to soften the highs

Mesa Boogie 5U4GB Rectifier Tube (Individual) Instru which is a wide rangeThe MESA 5U4GB Rectifier Tube is our very best overall 5U4 and our rectifier tube of choice in the production of all new MESA amps featuring this tube. This tube produces a "traditional vintage sag" with the most elastic and compressed feel of the two 5U4's that we offer. Amazing feel and exceptional overall quality make this our factory favorite. Based on classic 1950s technology, the 5U4GB is a vastly improved 5U4 design that is extremely reliable