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(!!!) (Best Pair) 5751 GE double mica gray plates NOS 1979-1981 (2.4/2.5ma and 2.3/2.6ma) 1-3% matched (Close Gm)
(!!!) (Best Pair) 5814A GE "5 STAR" NOS 1971-1972 (10.7/10.3ma and 9.8/10.2ma) (best 12AU7 sub)
(!!!) (Best Pair) 6A7G Marconi Radiotron Canada NOS 1950 era (47/29 and 47/29)
(!!!) (Best Pair) 6AC7=1852=VT-112 RCA low hours/tests like new 1940's (11.4/12.4ma)
(!!!) (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) 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) 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)
