Amps & Effects MESA/Boogie Amp Parts | Mesa/Boogie 5U4Gb Rectifier Tube

The Mesa/Boogie 5U4Gb Rectifier Tube Is Among Their Very Best Overall 5U4 And Their Tube Of Choice In The Production Of All Mesa/Boogie Amps That Feature This Tube. Based Upon Classic 1950S Technology, The 5U4Gb Is A Vastly Improved 5U4 Design That Is Extremely Reliable And Consistent, As Well As Much More Compact. This Tube Produces A “Traditional Vintage Sag” With The Most Elastic And Compressed Feel Of The Two 5U4’S That Mesa/Boogie Offers. The 5U4Gb Short Version Has An Amazing Feel And Exceptional Overall Quality That Make It Mesa/Boogie’S Factory Favorite.