5Y4G National Union NOS 1950 era (51/40 and 58/40)
5Y4G Philco by Sylvania NOS 1943 (54/40 and 57/40)
5Y4G Philco by Sylvania NOS 1950 (53/40 and 56/40)
5Y4G Philco by Sylvania NOS 1950 (54/40 and 58/40)
5Y4G RCA used/good 1948 (48/40 and 53/40)
5Y4G Sylvania NOS 1940's (50/40 and 55/40)
5Y4G Sylvania NOS 1940's (56/40 and 60/40)
5Y4GA RCA NOS 1963 (54/40 and 57/40)
5Y4GA RCA NOS 1971 (54/40 and 60/40)
5Y4GA Sylvania branded Zenith NOS 1960's (54/40 and 57/40)
5Y4GA Sylvania NOS 1960's (53/40 and 58/40)
6A8 GE metal can NOS 1959 (49/29)
6A8 GE metal can NOS 1959 (95/60)
6A8 GM Genuine Parts metal can used/tests like new 1940's (52/29)
6BL7GTA Sylvania Zenith NOS 1963 (38.5/34ma)
6BN8 Realistic Lifetime by Toshiba Japan NOS 1970's (103/60)
6BN8 Sylvania branded CBS "U" getter NOS 1957 (100/60)
6EA8 Sylvania branded Zenith NOS 1962 (18ma and 11ma)
6F5 GE metal can NOS 1946 (1.2ma Gm=1700)
6F5 GE metal can NOS 1953 (1.0ma Gm=1500)