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5R4GYB RCA NOS 1970 (53/40 and 52/40)
5R4GYB RCA NOS 1970 slightly tilted glass (52/40 and 53/40)
5R4GYB RCA used/strong 1970 (52/40 and 54/40)
5R4GYB RCA used/very good 1964 (51/40 and 54/40)
5T4 GE NOS 1945 (54/40 and 56/40)
5T4 GE NOS 1945 (56/40 and 58/40)
5T4 GE NOS 1945 (57/40 and 65/40)
5T4 Raytheon NOS 1950's
5U4G Crosley Sylvania used/good 1950 (55/40 and 56/40) stains at top from usage
5U4G RCA used/good 1953 a few oxide flakes inside tube (50/40 and 52/40)
5U4G Sylvania used/good 1948 small getter (54/40 and 55/40)
5U4GB Channel Master Japan 1960 double "D" getter halos low hours/tests like new (65/40 and 68/40)
5U4GB GE ITT NOS 1960's "D" getter (60/40 and 62/40)
5U4GB Hitachi Japan NOS branded Marconi 1960's a few very small vertical scratches on base (57/40 and 58/40)
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 Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
5U4GB Sylvania used/tests like new 1960's (54/40 and 54/40)
5U4GB Tungsol used/good 1960 (51/40 and 60/40)
