(!!!) (BEST PAIR) 6AN8A Westinghouse and Westinghouse branded GE NOS 1965-1967 (13/12ma and 14.4/11.6ma)
(!!) 6AN8A Westinghouse branded GE NOS 1963 era (16.8/16.0ma) (Highest mA and Gm)
(!!) 6AN8 RCA gray plates NOS 1960 (15.5/11.2ma)
(!!) 6AN8A RCA NOS 1972 (17.2/13.4ma) (strongest single)
(!) 6AN8A Tungsol NOS 1964 (13.6/14.4ma)
(!) 6AN8 RCA black plates "D" getter halo 1958 rebranded Admiral (14.2/10.5ma)
(!) 6AN8A GE NOS 1961 (14.8/13.6ma)
(!!) 6AN8A Sylvania coated glass NOS 1960's (20.2/11.2ma)
6AN8A RCA gray plates used/tests like new 1960's (16.6/12.4ma)
(!!) (Recommended Single) 6AN8A Sylvania NOS 1960's (16.4/11.5ma)
(!!) 6AN8A RCA NOS 1972 (15.4/10.2ma)
(!!) (Recommended Single) 6AN8 Sylvania NOS 1960 era (17/14.8ma)