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5U4G / 5U4GB tubes
This 1940s National Union 5U4G full-wave rectifier tube has an ST bottle, ribbed black plates, bottom D getters, and hanging filaments. The white print on the base has the National Union logo. Tube tests as new with balanced diodes.
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This 1960 CBS 5U4GB full-wave rectifier tube black plates and a halo getter. The tall bottle has "5U4GB" etched in the glass and the red print on the base has the CBS logo. Tube tests as new.
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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.
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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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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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