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5U4GB Hitachi Japan NOS branded Marconi 1960's a few very small vertical scratches on base (57/40 and 58/40)
5U4GB Tungsol used/good 1960 (51/40 and 60/40)
5V3 GE branded ITT NOS 1960's (52/40 and 54/40)
5V3A RCA NOS 1962 (47/40 and 48/40)
5W4GT Tungsol NOS 1952 (52/40 and 54/40)
5Y3G GE used/good 1943 (46/40 and 52/40)
5Z3P Chinese (substitute is 5U4G or 5U4GB)
5Z4 CBS NOS 1954 (53/40 and 55/40)
5Z4 Ken Rad NOS 1946 (53/40 and 53/40)
5Z4 Ken Rad NOS 1949 (53/40 and 53/40)
5Z4 RCA JAN NOS 1959 (51/40 and 51/40)
5Z4 RCA NOS mid-1940's (50/40 and 51/40)
5Z4P Chinese (Best sub is 5Z4G or GZ30)
6004 CBS Hytron NOS (sold out)
6AL5 GE NOS (48/40 and 48/40)
6AL5 Sylvania branded RCA NOS 1970's (46/40 and 47/40)
6AL5 Sylvania Canada NOS (48/40 and 49/40)
6AL5 Sylvania D getter NOS 1955 (47/40 and 47/40)
6AL5 Tungsol rebranded GE NOS 1966 (48/40 and 50/40)
6AL5 US Brands used/good (50 in stock)
