The Slyvania 5AS4A Full Wave Rectifier Vacuum Tube is a vintage component from the renowned brand SYLVANIA. This rectifier tube, with its specific model number, is designed to provide a full wave rectification function for older audio and video equipment. Perfect for retro audio enthusiasts or collectors looking to restore vintage electronics, this tube is a crucial part of maintaining the authentic sound and performance of classic audio systems. May have shelf wear but is NOS