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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.
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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.
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This 1960s Sylvania 5U4GB full-wave rectifier tube has black plates and a top halo getter. The black base has yellow or red print with the Sylvania lightening logo and the bottle has 5U4GB inscribed on it. Tube tests as new.
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The 1962 Sylvania 5U4GB rectifier tubes in this precisely matched pair have ribbed black plates and halo getters. The green print on the bases has the Baldwin logo and matching date codes (312 226). Both tubes test as new with balanced diode sections.
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.
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