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(!!!!!) (Best Value Pair) 6350 Sylvania black ribbed plates large "U" getter 1957 low hours/like new (8.8/9.5ma and 8.5/11ma) (Emille Labs Cha'am, VTL, Shindo)
(!!!) (Best Value Pair) 6350 Sylvania rebranded United black ribbed plates NOS "U" getter 1957 (10.0/10.2ma and 10.5/9.5ma)
(!!!) (Good Value Pair) 6350 Sylvania black ribbed plates "U" getter used/good 1957 (9.6/9.3ma and 9.5/9.8ma) 1-3% matched (same Gm)
(!!!) (Recommended Pair) 6EM7=6EA7 Sylvania coin-base NOS 1970's (1.5ma/73ma and 1.8ma/65ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
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 used (2.5ma/28ma)
6EM7 RCA NOS 1965 (4.2ma/31ma)
6EM7 Sylvania NOS 1970 (1.5ma/47ma)
6EM7 Sylvania Silvertone NOS 1960's (1.5ma/55ma)
