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6350 Sylvania made for IBM black plates "U" getter halo used/good 1950's, faded printing (9.2/9.7ma)
6418=548DX Raytheon NOS 1959 (sold out)
6463 GE 5 Star NOS 1960 (14/20ma)
6463 GE NOS 1965 (12.0/12.6ma)
6463 GE NOS 1965 (20.5/14ma)
6661=6BH6 GE NOS 1975 (7.5ma)
6662=6BJ6 GE NOS (0 in stock)
6677=6CL6 GE NOS (5 in stock)
6678=6U8A GE NOS (3 in stock)
6A6 Raytheon like new 1930's (92-94/40) strong output
6A6 US Brands NOS 1940's (8 in stock)
6A7G Marconi Radiotron Canada NOS 1950's (6 in stock)
6A7G National Union used/good 1940's (40/29)
6A7G RCA Cunningham like new 1930's (45/29)
6A7G RCA used/tests like new 1940's faded printing (53/29)
6A7G Sylvania used/tests like new 1946 (48/29)
6A7G US Brands used/good (5 in stock)
6A8GT Raytheon NOS 1950 era small hairline crack in base (96/60)
6A8GT Raytheon NOS 1960 (49/29) (strong)
6AB4 GE branded CBS NOS 1960 era (13ma)
