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6350 Sylvania black plates NOS, "U" getter halo 1956, faded printing (11.5/14.5ma)
6350 Sylvania made for IBM black plates "U" getter halo tests like new 1959, faded printing (11.8/12.2ma)
6350 Sylvania made for IBM black plates "U" getter halo used/good 1950's, faded printing (9.2/9.7ma)
6463 GE 5 Star NOS 1960 (14/20ma)
6463 GE NOS 1965 (20.5/14ma)
6485=6AH6 Raytheon NOS 1950's
6485=6AH6 Raytheon NOS 1950's pin #3 shorter than other pins
(!) (Best Pair) 6661=6BH6 GE NOS 1960's (6.3ma and 6.4ma)
6662=6BJ6 GE NOS (0 in stock)
6AB4 RCA branded Sylvania NOS 1970 (10ma)
6AB4 RCA black plate NOS 1966 (11.5ma)
6676=6CB6A GE NOS mobile rated (13 in stock)
6677=6CL6 GE NOS (5 in stock)
6678=6U8A GE NOS (3 in stock)
6679 (see 12AT7)
6688 GE 5 Star used/good (7.2ma)
6688 GE NOS 1966 (9ma)
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)
