(!!!!) (Best Value Pair) 6550C Svetlana Russian NOS 2011 (142ma and 145.4ma)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
(!!!!) (Best Value Used Pair) 6550C Svetlana Russian used/good 2011 (132.2ma and 135.2ma) (same Gm)
(!!!!) (Best Value Used Pair) 6550C Svetlana Russian used/good 2011 faded printing (148.2ma and 144.0ma) (close Gm)
(!!!!) (Used Pair) 6550C Svetlana Russian used/good 2000-2001 (150ma and 152.5ma)
(!!!!) (Used Pair) 6550C Svetlana Russian used/good 2000-2003 (141ma and 141.2ma)
(!!!!) (Used Pair) 6550C Svetlana Russian used/good 2001 (134.6ma and 137ma)
(!!!!) (Used Pair) 6550C Svetlana Russian used/good 2001 faded top getters (146.2ma and 149.6ma)
(!!) (Best Single 1967) 6550 Tungsol branded Hewlett Packard NOS 1967 (146.5ma)
(!!) (BEST VALUE) 6550A GE stapled plates NOS around 1980 (119ma) (nice single)
(!!) (Recommended Single) 6550A GE branded Westinghouse stapled plates NOS 1980 era (129ma)
(!!) (Recommended Single) 6550A GE rebranded RCA stapled plates NOS 1979 slightly tilted glass (136.5ma)
(Best Quad) 6550C Svetlana Russian NOS 1996-1999 (143.4, 144.6, 144.8, 144.2ma)
6550A GE stapled plates used/good 1980's (115ma)
JAN-6550A GE NOS 1985-1986 slightly tilted glass (153ma)