Big bulb vintage rectifier tube used in high-end audio amplifiers but also in modern recto-type amps, such as the Mesa Boogie Double/Triple Recitifer. It can replace the 5U4GB. Its tone is smoother than that of a solid state rectifier.
Substitute for the 5Z3P / 5Z3PAT / 5Z3P-J or 5C3S rectifier tube like used in LABOGA Mr Hector Head.
