5U4GB Hitachi Japan NOS branded Marconi 1960's a few very small vertical scratches on base (57/40 and 58/40)
5U4GB Raytheon used/good 1960 era (54/40 and 54/40)
5U4GB RCA BALDWIN used/good 1962 glass slightly tilted in base (53/40 and 53/40)
5U4GB RCA Motorola used/good 1962 (54/40 and 55/40)
5U4GB RCA used/good 1950's slightly tilted glass (55/40 and 56/40)
5U4GB RCA used/good 1968 (56/40 and 57/40)
5U4GB Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
5U4GB Tungsol used/good 1960 (51/40 and 60/40)
5Z3P Chinese (substitute is 5U4G or 5U4GB)
