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(!) (Single) 7591 EICO Westinghouse used/70% 1961 top edge of base is chipped (42ma and Gm=7350)
(!) 12BH7A GE gray oval plates "O" getter halo used/good 1964 (7.2ma/8.5ma)
(!) 12BH7A Toshiba rebranded "Bell and Howell Schools" like new 1960's (9/10.4ma)
(READ REVIEW) ECF80=6BL8 Telefunken Germany <> bottom NOS 1971 (11.5/9.6ma and 12.2/9.5ma) (best sound)
(slightly microphonic) 12BH7 GE Zenith NOS "U" getter 1953 (10.0/10.6ma)
12BH7A GE gray oval plates used/good "U" getter 1950's (7.6/7.8ma)
6AU6A GE NOS 1970's (7.5ma) (Sony C800G)
6AU6A GE NOS 1977 (6.3ma) (Sony C800G)
6AU6A GE NOS 1977 (6.4ma) (Sony C800G)
6AU6WB Sylvania NOS 1968 (6.4ma)
6AU6WB=6136 Sylvania branded Westinghouse NOS 1974 (7.2ma)
6AU6WC Sylvania NOS 1970-1980 (0 in stock)
6AU6WC=6136 GE NOS 1978-1979 (7.7ma)
7591 Tungsol used good 1963 (55ma, Gm=8100)
7591A Sylvania branded RCA used/75% 1968 (51ma, Gm=7,600)
