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6AX5GT RCA branded Raytheon NOS 1960 era (50/40 and 52/40)
6AX5GT RCA NOS 1963 (52/40 and 58/40)
6B4G Raytheon NOS 1950 era (94ma)
6B4G Sylvania branded RCA NOS 1940 era (100ma)
6B4G Sylvania rebranded Delco NOS separate plates 1952 (81ma)
6B4G Sylvania rebranded RCA used/good 1953 (77.5ma)
6B4G Zenith by Sylvania NOS plates connected 1940's (123ma)
6BG6GA GE Relaible Selectron NOS 1957 (74ma)
6BG6GA Raytheon NOS 1957 (73ma)
6BL7GT Sylvania low hours 1953 D = rectangle getter halo long scratch on base (33.5/37.5ma)
6BL7GT Sylvania used/good 1954 (39.2/40.4ma)
6BL7GTA GE gray plates NOS 1974 (47/53ma)
6BL7GTA GE used/good 1959 (30.5/27ma)
6BL7GTA Sylvania tests like new faded printing 1960's (59/85ma)
6C4WA Sylvania NOS 1965 and 1971 (read review)
6C6 Sylvania NOS 1950 (48/31)
6CL8A Sylvania NOS (15 in stock)
6CS7 Raytheon by Toshiba Japan gray plates NOS 1970 era (21.5/10.2ma)
6CY5 NOS (40 in stock)
6D6 Tungsol NOS (77/40)
