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(!!!!) (Best Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!!!) (BEST PAIR) 6BL7GTA GE branded RCA/Raytheon"D" getter halo NOS 1950's (37.0/38.2ma and 35.5/42.2ma) (close Gm matching)
(!!!!) (BEST PAIR) 6BL7GTA GE branded Tungsol "D" getter halo NOS 1950's (36.6/37ma and 39/37ma) (close Gm matching)
(!!!!) (Best Quad) 6BL7GTA Sylvania black plates NOS 1960's same build matched quad
(!!!!) (SINGLE) 6BL7GTA RCA NOS 1966 (33.4/33.0ma)
(!!!) (Best Pair #1) 6BL7GTA GE black plates NOS 1959-1960 (50/49ma and 49/52.5ma)
(!!!) (Best Pair #1) 6BL7GTA Sylvania black plates NOS 1960's (44.5/40.5ma and 40.5/42.2ma)
(!!!) (Best Pair #2) 6BL7GTA Sylvania black plates NOS 1960's (39.2/36ma and 37.5/38.6ma)
(!!!) (Best Pair #3) 6BL7GTA Sylvania black plates triple mica NOS 1960 era (32.8/34ma and 34.5/35.6ma) (close Gm matching)
(!!!) (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 RCA Pair #2) 6BL7GTA RCA clear top side getter NOS 1966-1969 (38.5/39.5ma and 40.5/36.0ma)
(!!!) (Best RCA Pair) 6BL7GTA RCA clear top side getter NOS 1965-1969 (46.8/49.2ma and 44.0/46.5ma)
(!!!) (Recommended Pair) 6BL7GTA GE and GE branded Admiral 1960's (38/40ma and 35/45ma)
(!!!) 6BL7GTA GE branded Marconi NOS 1960 era tilted glass (46/53ma) (High Gm) strong single
(!!) (BEST SINGLE) 6BL7GTA Tungsol NOS 1960 era (43/44ma)
(!!) (Pair) 6BL7GTA Sylvania branded GE NOS 1968 (37.5/38.8ma and 41/35.6ma)
(!!) (SINGLE) 6BL7GT Sylvania branded Tungsol triple mica NOS 1956-1957 (36.2/31.5ma)
