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311CH Cetron NOS in original box 1979 (100ma) (311CH is sub for 211H)
5687WA GE used/tests like new 1970's (44/45ma) (highest Ma and Gm)
5R4GYB RCA brown base like new 1970's part of glass partially melted into bottom mica (48/40 and 49/40)
5R4GYB RCA brown base NOS 1970's part of glass melted into bottom mica (50/40 and 53/40)
5U4GB Sylvania Canada NOS 1960's (61/40 and 64/40) (similar build to RCA)
6550A GE stapled plates used/good 1980's (115ma)
6688 GE 5 Star used/good (7.2ma)
6688 GE NOS 1966 (9ma)
6AS7GA Sylvania metal base NOS 1960's (77/87ma)
6BQ5 GE NOS 1960's (40ma)
6BQ5 GE NOS 1973 (71ma) (recommended for FIXED-BIAS amp only due to high current)
6BQ5 GE NOS 1977 (58.5ma)
6BQ5 GE Zenith NOS 1976 (46.2ma)
6BQ5 Lindal Japan like new 1970's (50ma)
6BQ5 Lindal Japan NOS 1970's (42ma)
6BQ5 Lindal Japan NOS 1978 (59.5ma)
6BQ5 RCA gray plate used/good 1967 (32.6ma)
6BQ5 RCA Magnavox gray plate used/good 1961 (44ma)
6BQ5 RCA used/good 1970 (40ma)
6CA7=EL34 Siemens Germany skinny bottle branded CEI NOS 1975 (79ma)
