(!!!) (BEST 6BL7GTA RCA PAIR) 6BL7GTA RCA NOS 1960's slightly tilted glass (35.0/35.5ma and 36.5/37ma)1-3% matched
(!!!) (BEST VALUE) 6BL7GTA GE NOS and like new 1960's same build (46/51ma and 43/52ma) (Highest Testing Pair)
(!!!) (Recommended GE Pair) 6BL7GTA GE NOS 1964-1966 same build (35/35ma and 32/33.5ma)
(!!!) (Recommended Pair) 6BL7GTA GE and GE branded Admiral 1960's (38/40ma and 35/45ma)
(!!!) (Recommended Sylvania Pair) 6BL7GTA Sylvania NOS 1960's same build (33/34ma and 35/36ma)
(!!) (Best Value Pair) 6BL7GTA GE NOS and like new 1960's same build (41.5/43ma and 44/46ma) (Highest Ma)
(!!) (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)
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 NOS 1960's (36/38.5ma)
6BL7GTA Sylvania used/good 1960's (31/33ma)
