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(!!) 6BL7GT GE "D" getter NOS 1957 (36/37.4ma)
(!!) 6BL7GTA RCA low hours/like new 1961 (42.2ma/43.6ma) 1-2% section balance
(!!) 6BL7GTA RCA low hours/like new 1962 (38.4ma/38.2ma) 1-2% section balance
(!) (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)
