(!!) (Recommended Pair) 6GK5=6FQ5A Hitachi Japan rebranded Raytheon NOS (8.5/8.6ma)
(!!) (Recommended Pair) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971-1972 (17ma and 18ma) (Highest mA and Gm)
(!!) (Recommended Pair) 6HB5 Sylvania NOS branded Philco and Zenith 1963-1969 (107ma and 116ma)
(!!) (Recommended Pair) 6HF5 Sylvania NOS 1960's (93ma and 97ma)
(!!) (Recommended Pair) 6J6A Tungsol NOS "D" getter 1961 (7.5/8.8ma and 7.8/9.2ma)
(!!) (Recommended Pair) 6JS6C GE Realistic and GE NOS 1970's - 1981 (70ma and 76ma)
(!!) (Recommended Pair) 6JT6A Sylvania tipped NOS 1960's same build (72ma and 72.2ma)
(!!) (Recommended Pair) 6KM6 GE branded Westinghouse NOS (152ma and 155ma)
(!!) (Recommended Pair) 6KZ8 Sylvania branded Raytheon NOS
(!!) (Recommended Pair) 6ME6 GE NOS (70ma and 73ma)
(!!) (Recommended PAIR) 6S4A RCA USA black plate NOS 1960's - 1970's (25.5ma and 28.5ma) (Highest mA and Gm)
(!!) (Recommended Pair) 6S4A Westinghouse black plate NOS -1963 era (20ma and 21.2ma)
(!!) (Recommended Pair) 6SH7 GE metal can NOS 1958 and 1970 (10.3ma and 11ma)
(!!) (Recommended Pair) 6SH7 GE metal can NOS 1976 (10.2ma and 10.2ma) **
(!!) (Recommended Pair) 6SH7 GE metal can NOS 1976 (11ma and 11ma) **
(!!) (Recommended Pair) 6SH7 GE metal can NOS 1976 (12ma and 13ma) **
(!!) (Recommended Pair) 6SH7 GE metal can NOS 1976 (9ma and 8.6ma) **
(!!) (Recommended Pair) 6SK7 Sylvania NOS 1950 era (9.2ma and 9.0ma)
(!!) (Recommended Pair) 8068 GE Hewlett Packard scratch on glass and GE NOS 1970-1971 (46.5ma and 48ma) (Highest Ma)
(!!) (Recommended pair) E83F=6689 Philips SQ Holland NOS gold pins 1974 (9.4ma and 9.6ma)
