Following the introduction of the ER274B and ER274A, this is the third rectifier in the Elrog range and the 14th tube-type here is the newest member of the ELROG family. The ER5U4G. As with all ELROG tubes, the ER5U4G has a thoriated tungsten filament that produces a bright light. The ELROG ER5U4G is compatible with the 5U4 specification and can be used in any application designed for 5U4, 5U4GB, or 5U4WG.
The two plates are vertically stacked so that the filament is visible between them.