(!!!!!) (Good Value Pair) 6350 Sylvania black plates NOS 1950's "D=SQUARE" getter rebranded United (8.8/9.2ma and 9/10.2ma)
(!!!!!) (Recommended Pair) 6350 Sylvania rebranded United black ribbed plates NOS large "U" getter halo 1955-1957 (10.8/12.4ma and 10.8/11.5ma)
(!!!) (Good Value Pair) 6350 Sylvania black ribbed plates "U" getter used/good 1957 (9.0/9.2ma and 9.2/10ma) 1-3% matched
(!!!) 6EM7 IEC Servicemaster by Hitachi Japan NOS 1968 (1.1ma and 47.5ma)
(!!) (Best Single) 6EM7 RCA black plates NOS 1969 (2.9ma and 53ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!) 6EA7=6EM7 Sylvania Zenith coin-base NOS 1970's (1.8/65ma)
(!!) 6EM7 Sylvania NOS 1960 era (1.5/55ma)
(!) (BEST SINGLE) 6EM7 RCA coin-base black plates NOS 1970's (2.4ma and 57ma)
6EA7 GE black base rebranded Zenith 1960 used/good (3.6ma/35ma)
6EA7 GE NOS 1965 (2.4ma/57.5ma)
6EM7 GE Amperex NOS 1970's (2.4ma/34ma)
6EM7 GE Canada NOS 1960's (2.9ma/30ma)
6EM7 RCA black plates NOS 1965 (1.2ma and 30ma)
6EM7 RCA coin-base black plates NOS 1970's broken guide pin (2.4ma/50ma)
6EM7 RCA coin-base black plates used/good 1970's (2.6ma/63ma)
6EM7 RCA coin-base used (2.5ma/28ma)
6EM7 Sylvania coin-base NOS 1970's (1.5ma/73ma)
6EM7 Sylvania coin-base NOS 1970's (2.2ma/60ma)
6EM7 Sylvania NOS 1960's (1.7ma/75ma)