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(!!!!) (Single) 6BK7B RCA NOS "U" getter 1950's (7.5/8.5ma)
(!!!!) (Best Pair) 6BQ7A RCA black plates NOS 1967 same date codes (15/14.5ma and 13.5/16.5ma)
(!!!) (Recommended Single) 6BZ7 RCA black plates "U" getter NOS 1957 (9.0/9.4ma)
(!!!!) (Single) 6BK7B RCA NOS 1960's faded printing (7.4/7.4ma)
(!!!!) (Single) 6BK7B RCA NOS 1962 (7.4/8.3ma)
(!!!!) (GE Pair) 6BQ7A GE NOS "O" getter halo 1973-1980 (10.5/9.7ma and 11.4/9.4ma) (Schiit, DNA, Modwright)
(!!!!) (GE Pair) 6BQ7A GE NOS "O" getter halo 1976 (7/10ma and 7/9ma) (Schiit, DNA, Modwright)
(!) (BEST PAIR) 5BZ7=5BQ7A GE gray plates NOS 1971 (10.8/10.6ma and 10/9.3ma)
5BZ7=5BQ7A GE gray plates NOS 1971 (13/16.2ma)
