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5AS4A Westinghouse "D" getter halo 1960-1965 (58/40 and 58/50)
5BQ7A GE black plates "U" getter 1961 (10.8/7.0ma)
5BQ7A GE Dumont gray plates "O" getter 1973 (12.8/8.2ma)
5U4GB Raytheon used/good 1960 era (54/40 and 54/40)
5U4GB RCA BALDWIN used/good 1962 glass slightly tilted in base (53/40 and 53/40)
5U4GB Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
6240G Luxman by NEC Japan NOS 1960's (6.3/7.4ma)
6240G Luxman by NEC Japan NOS 1960's (6.7/8.0ma)
6384 Tungsol used/good 1960's (63.5ma)
6973 Sylvania gray plate NOS 1970's (61ma)
6AK5 Westinghouse NOS 1970 (5.8ma)
6AK5 Westinghouse NOS 1970 (6.6ma)
6AR6 Raytheon black plate used/good 1952 (67ma)
6AW8A GE NOS 1976 (4.9/21ma)
6AX4GTB Tungsol used/good 1950's (48/40)
6BA6 RCA Mexico NOS 1970 era (12ma)
6BQ5 GE NOS 1960's (40ma)
6BQ5 GE NOS 1960's (47ma)
6BQ5 GE NOS 1960's (70ma) (recommended for FIXED-BIAS amp only due to high current)
6BQ5 GE NOS 1971 (43.5ma)
