(!!!!) (BEST OVERALL PAIR) 6BL7GTA RCA NOS 1960's (33/35ma and 31/34.5ma) 1-3% matched
(!!!!) (Recommended Single) 6BL7GTA RCA NOS "D" getter NOS 1961 (33/37ma)
(!!!) (BEST 6BL7GTA RCA PAIR) 6BL7GTA RCA NOS 1960's slightly tilted glass (35.0/35.5ma and 36.5/37ma)1-3% matched
(!!!) (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 Value Pair) 6BL7GTA GE NOS and like new 1960's same build (41.5/43ma and 44/46ma) (Highest Ma)
(!!) (Recommended Pair) 6BL7GTA RCA NOS and like new 1960's (34/40ma and 38.6/39.8ma)
(!!) (Recommended) 6BL7GTA GE rebranded Raytheon "D" getter NOS 1950's (39/43ma)
(!!) 6BL7GT GE NOS "D" getter 1957 (36ma/39ma)
(!!) 6BL7GTA GE NOS "D" getter 1958 (43ma/53ma)
(!!) 6BL7GTA GE NOS 1966 (47/50ma)
(!) 6BL7GTA Tungsol "O" getter halo NOS 1960 era (38/43ma)
(!) 6BL7GTA Tungsol NOS 1960 era (34/36.5ma)
6BL7GT Sylvania low hours 1953 D = rectangle getter halo long scratch on base (33.5/37.5ma)
6BL7GTA GE gray plates NOS around 1970 (47/53ma)
6BL7GTA RCA coin-base NOS 1970's (31/32ma)
6BL7GTA RCA NOS 1967 (35.5/37.2ma)
6BL7GTA RCA NOS 1968 (32/33.5ma)
6BL7GTA Sylvania used/good 1960's (31/33ma)
