5U4G / 5U4GB tubes

This 1950 Tung-Sol 5U4G rectifier tube has ribbed black plates and a bottom D getter. The white print on the base has the Emerson logo. Tube tests as new with matching diode sections.

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 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.