Mesa/Boogie 5U4GB 750541F Rectifier Tube
The MESA 5U4GB RECTIFER TUBE produces a “traditional vintage sag” with the most elastic and compressed feel of the two 5U4’s that Mesa offers. Amazing feel and exceptional overall quality make this a factory favorite. Based on classic 1950s technology, the 5U4GB is a vastly improved 5U4 design that is extremely reliable and consistent, as well as more compact compared to original “Coke Bottle” 5U4Gs.
This tube is similar in size to a 6L6 power tube so please take special care to install them in the correct tube position(s), especially when replacing 6L6’s at the same time.