The MESA® 5U4G RECTIFIER TUBE is a classic 1930s "Coke Bottle" design. It produces a flexible, elastic, and spongy feel that is a bit more controlled and slightly less "saggy" than our newer 5U4GB.
Please Note: The 5U4G is a tall "Coke Bottle" design. This tube may not fit in all amplifiers. Before choosing this tube, please confirm the height available between your chassis and cabinet, taking into account the tube pins, to ensure there’s enough room to install this tube in your amp.