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(slightly microphonic) 12BH7 GE Zenith NOS "U" getter 1953 (10.0/10.6ma)
(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10.6/7.4ma) (1st series made)
(!!!!) (Single) 12BH7A GE gray oval plates 1962 (6.6/9.6ma)
(!!!) (Slightly microphonic Single) 12BH7A CBS Oval Black Plates "U" getter NOS 1960 era (8.4/9.0ma)
(!!!) 12BH7A RCA branded Zenith NOS 1970 era (10/13.2ma)
(!!) 12BH7A Philco Sylvania gray oval plates "O" getter halo used/good 1962 (6.5/7.3ma)
(!!) 12BH7A RCA gray plates used/good 1960's (8.0/11.2ma)
(!!) 12BH7A RCA gray plates used/good 1970 era (8/9ma)
(!!) 12BH7A Sylvania NOS pinched plates 1970's (7.4/8.8ma)
(!!) 12BH7A Westinghouse black plates "U" getter used/good 1950's (6.2/7.2ma)
(!) 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)
(!!!!) (Single) 12BH7 Tungsol branded Shield gray oval plates "U" getter halo NOS 1961 (11.8/16.5ma) (Highest mA and Gm)
(!!) 12BH7A RCA used/good/75% 1967 (7/6ma)
(!!!) (Single) 12BH7A CBS Oval Black Plates "O" getter used/good 1960 (7.3/9.6ma)
(!!!!) (Single) 12BH7A GE gray oval plates NOS mid-1960's (11.5/16ma)
(!!!!) 12BH7A Westinghouse gray ribbed plates used/good "U" getter 1960 era (8.4/11ma)
12BH7A GE gray oval plates used/good "U" getter 1950's (7.6/7.8ma)
ECC99 JJ (best identical substitute is 12BH7A RCA, Raytheon, Sylvania and GE)
(!!!) (Best Single 1956) 12BH7A GE gray oval plates NOS "U" getter 1956 (10/9.8ma)
