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6688 GE 5 Star used/good (7.2ma)
6688 GE NOS 1966 (9ma)
6973 Sylvania gray plate NOS 1970's (61ma)
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)
6EU7 GE branded as El Menco USA NOS (44/32 and 49/32)
6EU7 GE NOS 1960's (48/32 and 56/32)
6FS5 GE branded RCA NOS (6.5ma)
6FS5 Sylvania branded Dumont NOS (8.2ma)
6FV6 US Brands NOS (12 in stock)