A rectifier tube that produces a "traditional vintage sag" with the most elastic and compressed feel.
Mesa Boogie 5U4GB Rectifier Tube - Short Version
The Mesa Boogie 5U4GB rectifier tube is among their very best overall 5U4 and their tube of choice in the production of all Mesa amps that feature this tube. Based upon classic 1950's technology, the 5U4GB is a vastly improved 5U4 design that is extremely reliable and consistent, as well as much more compact. The amp tube is basically the size of 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. This tube produces a "traditional vintage sag" with the most elastic and compressed feel of the two 5U4's that Mesa offers. The 5U4GB Short Version has an amazing feel and exceptional overall quality that make it Mesa Boogie's factory favorite.
Mesa Boogie starts with the finest tubes from around the world, tests, and matches each one under simulated operating conditions to the tightest, most demanding industry spec. Then backs them with the best warranty in the business.
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