The Mesa/Boogie Rectifier Tube 5U4GB offers a classic vintage sag with exceptional quality and reliability. Its compact design allows more efficient operation and maximum performance. Based on 1950s technology, it produces a highly reliable and consistent output, making it the preferred factory choice.

• 3-3/4" replacement power amplifier tube
• Based on classic 1950s technology
• Delivers that traditional vintage sag
• Mesa/Boogie's "factory favorite" tube — found on all new amplifiers
• Important Notice for International Customers: Mesa/Boogie products sold by Sweetwater are intended for use within the United States. We are unable to ship any Mesa/Boogie products outside of the US.