(!!!!) (Recommended Single) GZ37 Mullard UK NOS 1967 (50/40 and 50/40)
(!!!!) (Single 1950's) 12BH7A RCA branded Westinghouse narrow black plates NOS "U" getter mid-1950's (10/7.8ma) (1st series made)
(!!!!) (Single 1960) 12BH7A RCA "D" getter like new 1960 (9.4/8.8ma) (same Gm)
(!!!) (Best Sylvania Pair) 12BH7A Sylvania NOS pinched plates 1970 (11/9ma and 10/11ma) (Art Audio, Quicksilver, Rogue, Universal Audio)
(!!!) (Recommended Single) 12BH7A Westinghouse black ribbed plates "U" getter halo 1961 (8.5/10ma)
(!!!) 12BH7 GE Silvertone gray oval plates NOS "U" getter 1953 (8.2/8.0ma)
(!!!) 12BH7A GE NOS gray oval plates 1960's (9.5/13.5ma)
(!!!) 12BH7A RCA branded Zenith NOS 1970 era (10/13.2ma)
(!!) (Best Value Pair) 12BH7A Hitachi Japan branded Westinghouse NOS 1984 (10.4/9.2ma and 10.2/9.8ma) (McIntosh, Quicksilver, Art Audio, Wells)
(!!) (Best Value Pair) 12BH7A Hitachi Japan branded Westinghouse NOS 1984 (11/9.3ma and 10.2/9.3ma) (McIntosh, Quicksilver, Art Audio, Wells)
(!!) (Best Value) 12BH7A Tungsol black plates "O" getter halo NOS 1960 era (9.5ma/13ma)
(!!) (SINGLE 1953) 12BH7 GE NOS gray oval plates "U" getter 1953 NOS (9/12ma)
(!!) 12BH7A RCA gray plates used/good 1960's (8.0/11.2ma)
(!!) 12BH7A RCA gray plates used/good 1970 era (8/9ma)
(!!) 12BH7A Sylvania rebranded Westinghouse NOS pinched plates 1960's 1% section balance (7/7ma)
(!!) 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)
(slightly microphonic) 12BH7 GE Zenith NOS "U" getter 1953 (10.0/10.6ma)
12BH7A Channel Master Japan by Hitachi NOS 1962 (10/14ma)
