Classic 1930's "Coke Bottle" design. This tube produces "traditional vintage sag" with the most elastic and compressed feel of the two 5U4's that we offer. It offers a wonderful spongy feel but moderate life expectancy.
Please Note: The 5U4G is no longer the tube of choice for new Mesa amps that feature a 5U4 type Rectifier tube. All current Mesa amps ship with the newer 5U4GB. Due to tall "Coke Bottle" design, this tube may not fit in all amplifiers. Please confirm height before purchasing. Generally measures 4 3/4 inches from the bottom of the base to the top of the tube (5 1/4 inches including pins) and 2 inches in diameter (but can vary in production).