5U4G / 5U4GB tubes

This early 1960s GE 5U4GB rectifier tube has gunmetal gray plates and a side D or side O getter. The tall bottle has "5U4GB U.S.A." and the dot pattern characteristic of GE tubes etched in the glass. The black base has white print. Tube tests as new.

This 1960s Raytheon 5U4GB full-wave rectifier tube has black plates and dual side getters. The yellow print on the glass has the Raytheon logo (partial). Tube tests as new with balanced diodes.

This 1970s RCA 5U4GB full-wave rectifier tube has black plates and a side getter. The red print on the glass has the RCA logo. Tube tests as new.