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(!!!) (Best Pair) 6AG7Y RCA brown bottom NOS 1960-1964 (32.3ma and 32.5ma)
(!!!) (Best Pair) 6AH6WA GE NOS 1980's (10.6/11ma)
(!!!) (Best Pair) 6AN8A RCA Motorola NOS 1973 (17.6/14.6ma and 16.5/15.6ma)
(!!!) (BEST PAIR) 6AN8A RCA NOS 1968 (16.2/15.6ma and 16.5/13.4ma) (close Gm matching)
(!!!) (Best Pair) 6AU6A Channel Master Hitachi Japan NOS D getter 1960 (8.6ma and 9.2ma)
(!!!) (Best Pair) 6BL7GTA GE black plates NOS 1958 and 1966 (43.0/44.5ma and 40.5/41.5ma) (very close Gm matching)
(!!!) (Best Pair) 6BL7GTA GE gray plates NOS 1972 and 1983 (42.5/47.5ma and 41.0/41.5ma) (very close Gm matching)
(!!!) (Best Pair) 6BL7GTA Sylvania branded GE NOS 1967-1968 (42.5/39.5ma and 40.2/43.2ma)
(!!!) (Best Pair) 6BL7GTA Sylvania branded RCA triple mica "D" getter 1959-1960 (44.5/40.6ma and 41.5/42.0ma) (Close Gm)
(!!!) (BEST PAIR) 6BX7GT Sylvania "D" getter halo NOS 1950's (57.6/62.6ma and 64.0/58.0ma) (close triode balance)
(!!!) (Best Pair) 6CS7 RCA gray plates NOS 1970 era (20/10.6ma and 21/12.2ma)
(!!!) (Best Pair) 6FQ7 GE NOS 1970's (9.8/8.8ma and 8.5/9.6ma) (close Gm)
(!!!) (Best Pair) 6HA5=6HM5=EC900 Amperex Holland "Globe Logo" NOS in white boxes 1971-1972 (12.0ma and 12.8ma)
(!!!) (Best Pair) 6SC7 GE metal can NOS 1953-1955 (2.3/1.9ma and 2.3/2.1ma)
(!!!) (Best Pair) 6SH7GT Ken Rad 1950's rebranded Raytheon NOS 1970 (10ma and 10.4ma) (same Gm)
(!!!) (Best Pair) 71A Sylvania NOS 1947 branded Hytron 1951 (25.6ma and 27.4ma)
(!!!) (BEST PAIR) 7308 Sylvania JAN NOS 1976 in white boxes (14.4/19.4ma and 18.0/15.6ma)
(!!!) (Best Pair) 864=VT-24 Hytron USA NOS 1940's (3.1ma and 3.1ma)
(!!!) (Best Pair) 864=VT-24 Hytron USA NOS 1940's (3.2ma and 3.2ma)
(!!!) (Best Pair) 864=VT-24 Hytron USA NOS 1940's (3.4ma and 3.4ma)
