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(!!!!) (Single) 6BK7B Tungsol branded RCA "U" getter 1957 (10/14ma)
6SF5 Sylvania used/good 1949 (0.8ma Gm=1100)
(!!!!) (Best GE Single) 6BK7B GE gray plates NOS "U" getter 1974 (8.0/8.8ma)
(!!!!) (Single) 6BK7B GE gray plates NOS "U" getter 1963 (6.2/5.4ma)
231D Western Electric NOS 1953 (1.6ma)
6BJ6 Rogers Canada made by Sylvania like new 1955-1956 (8.8mA)
6BJ6 Hitachi Japan like new (8.8mA)
6CY7 (sold out)
6CM7 GE NOS 1974 (4.4ma and 19ma)
6CM7 GE Zenith NOS 1969 (7.5ma and 25ma) (highest mA and Gm)
6CM7 Westinghouse Canada NOS 1960's (5.0ma and 16.6ma)
(!!!!) (Best Value Pair) 6BQ7A RCA black plates NOS "D" and "U" getter 1957 (9/16ma and 9/14.5ma)
(!!) (Best Pair #2) ECC40 Philips NOS made by La Radiotechnique, Chartres/France 1969 (7.1/6.3ma and 7.2/6.1ma)
(!!!!) (Recommended Pair) 6BQ7A RCA black plates NOS 1964-1968 (9.2/11.2ma and 10.2/11ma)
(!!!!) (Recommended Pair) 6BQ7A RCA black plates NOS 1967 same date codes (11.8/12ma and 11/12.2ma)
6DX8=ECL84 RCA Mullard UK NOS 1976 (3.1ma and 18ma) (Shindo Monbrison)
6DX8=ECL84 GE Hitachi JAPAN 1978 (3.0mA and 14mA) (Shindo)
6DX8=ECL84 GE Hitachi JAPAN 1972 (5.1mA and 13mA) (Shindo)
6DX8=ECL84 Motorola Toshiba JAPAN used/good 1960's (3.3mA and 12.5mA) (Shindo)
(!) (Best Single) 7N7 Sylvania NOS 1960 era (10.8/11.2ma)
