Product Detail
MESA® 5U4GB Rectifier Tubes are a compact, shorter - profile option. They're our top - pick 5U4 tubes for all new MESA amps featuring them. These tubes create a 'traditional vintage sag' with an incredibly elastic and compressed feel, out of the two 5U4s we offer. Their amazing feel and top - notch quality make them a factory favorite. Built on 1950s classic tech, the 5U4GB is a much - improved 5U4 design. It's super reliable, consistent, and more compact than the original 'Coke Bottle' 5U4Gs (just 3 3/4' from base bottom to glass top). It's about the same size as a 6L6 power tube, so be extra careful when installing them, especially when replacing 6L6s. These tubes are used in popular MESA Amps like the Dual and Triple Rectifiers®, Road King®, Roadster®, Stiletto Ace™, Deuce™ & Trident™. MESA Rectifier Tubes are premium - grade, offering unmatched consistency and reliability for any tube amp, especially MESA ones. We're dedicated to making the world's best tube amps, and tube quality is key to that goal.
Using the Mesa Boogie 5U4GB Rectifier Tube is straightforward. First, make sure your amp is turned off and unplugged for safety. When installing, pay close attention to the tube's position, as it's similar in size to a 6L6 power tube. If you're replacing 6L6s at the same time, double - check you're putting the 5U4GB in the right spot. Once installed, you can turn on your amp and enjoy the unique 'traditional vintage sag' sound it produces. As for maintenance, keep your amp in a clean and dry environment. Avoid exposing it to extreme temperatures or humidity. Regularly check the tube for any signs of damage, like cracks in the glass. If you notice any issues, it's best to replace the tube right away to keep your amp working at its best.
