(!) (Best Single) ECF80=6BL8 Telefunken Germany <> bottom NOS 1961 slightly faded top getter (12.8/25ma) (highest Ma and Gm)
(!) (Best Value) EM87 Haltron East Germany NOS (20 in stock)
(!) (Good Value Single) ECF80=6BL8 Telefunken Germany <> bottom like new 1971 (11.6/9.6ma)
(!) (Good Value Single) ECF80=6BL8 Telefunken Germany <> bottom used/good 1964 (10.0/10.2ma)
(!) (SINGLE) 12BH7A RCA used/very good 1960's (7.4/9.2ma)
(!) 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)
(BEST VALUE) EM87 Dumont England NOS (4 in stock)
(slightly microphonic) 12BH7 GE Zenith NOS "U" getter 1953 (10.0/10.6ma)
12BH7A Channel Master Japan by Hitachi NOS 1962 (10/14ma)
12BH7A GE gray oval plates used/good "U" getter 1950's (7.6/7.8ma)
12BH7A Matsushita Japan branded Amperex Holland NOS 1970's (8.8ma/9.6ma)
6AU6WB Sylvania NOS 1968 (7.2ma)
6AU6WC Sylvania NOS 1970-1980 (0 in stock)
6AU6WC=6136 GE NOS 1978-1979 (7.7ma)
7591 Fisher Westinghouse used/good/75% 1963 (43.5ma, Gm=7450)
7591 Tungsol used good 1963 (55ma, Gm=8100)
7591 Westinghouse branded RCA NOS 1963 (51.5ma, Gm=9050)
7591A Sylvania branded RCA coin-base NOS 1970's (63ma, Gm=10,000)
7591A Sylvania branded RCA used/75% 1968 (51ma, Gm=7,600)
