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(!!!!) (Best Pair) 6BL7GT GE "D" getter NOS 1957 same build (34/36ma and 37/32ma)
(!!!) (Best Pair #1) 6BL7GTA GE black plates NOS 1959-1960 (50/49ma and 49/52.5ma)
(!!!) (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)
(!!!) (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
(!!) (Pair) 6BL7GTA Sylvania branded GE NOS 1968 (37.5/38.8ma and 41/35.6ma)
(!!) 6BL7GT GE "D" getter NOS 1957 (36/37.4ma)
(!) (Recommended Pair) 6BL7GTA RCA coin-base NOS 1970's (33/35ma and 35/30ma)
6BL7GT Sylvania low hours 1953 D = rectangle getter halo long scratch on base (33.5/37.5ma)
6BL7GT Sylvania used/good 1954 (39.2/40.4ma)
6BL7GTA GE gray plates NOS 1974 (47/53ma)
6BL7GTA Sylvania tests like new faded printing 1960's (59/85ma)
