Description:

Short version: 3 3/4" from bottom of base to top of glass.

The MESA 5U4GB rectifier tube is their very best overall 5U4 and their tube of choice in the production of all new Mesa amps featuring 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 - It 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 - Amazing feel and exceptional overall quality make this their factory favorite

Mesa Boogie starts with only the finest tubes available from around the world. They then test and match every tube, while under the stress of actual operating conditions, to the tightest, most demanding specifications in the industry with the use of the Mesa Boogie proprietary, aerospace designed tube analysis system called Robotube™. They accept only the "finest of the finest" and back them with the best warranty in the business for a minimum of six months.