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(!!!) (Recommended Pair) 6EM7=6EA7 Sylvania coin-base NOS 1970's (1.5ma/73ma and 1.8ma/65ma)
(!!) (Best Overall Pair) 6FY5=EC97 Sylvania branded GE NOS 1974 same date codes (14.5ma and 14.8ma)
(!!) 6EA7 Sylvania NOS 1960 era (2.1/43ma)
(!!) 6EA7=6EM7 Sylvania coin-base NOS 1970's (1.8/53.6ma)
(!) (4th Best Pair) 6FY5=EC97 GE and Sylvania NOS made in JAPAN same build (12ma and 14ma)
(!) (Best Pair) 6FY5=EC97 International Servicemaster NOS made in JAPAN (22ma and 23.5ma) (Copy)
(!) (Best Pair) 6FY5=EC97 International Servicemaster NOS made in JAPAN (23ma and 23.4ma)
(!) (Single) 6FY5 GE Holland 1961 (9.6ma)
(!) (Single) 6FY5 International Japan NOS 1960's (19.2ma)
(!) (Single) 6FY5 Sylvania branded GE NOS (10.8ma)
(!) (Single) 6FY5 Sylvania NOS 1960's (13.6ma)
6EM7 RCA coin-base used (2.5ma/28ma)
6EM7 Sylvania NOS 1970 (1.5ma/47ma)
6EM7 Sylvania Silvertone NOS 1960's (1.5ma/55ma)
