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(!!!) (Best Single) 6U8A GE Motorola NOS 1977 (15.2ma/9ma)
JHS-6U8A Sylvania NOS 1966
(!) (Recommended SINGLE) 6U8A Sylvania NOS 1960's (19.8ma/10.6ma)
(!!!!) (Best Pair #1) 6U8A Philips by Sylvania NOS 1986 (16.2/8.5ma and 16.5/8.6ma) 1-3% matched
(!!) ECF82=6U8 Telefunken Germany <> bottom NOS 1968 (12.8ma triode and 8.2ma pentode)
(!!!!) (Best GE Single #1) 6U8A GE NOS 1980 (18.4/10.6ma)
(!!!!) (Best GE Single #2) 6U8A GE NOS "U" getter 1961 (17/9ma)
(!!) (Best Single) 6U8A Philips by Sylvania NOS 1986 (22.4ma and 12.2ma) (Highest mA and Gm)
(!!) (Single) ECF82=6U8 Toshiba Japan branded Telefunken NOS 1964 (14.2ma triode and 9ma pentode)
(!!) (Single) ECF82=6U8 Toshiba Japan branded Telefunken NOS 1964 (17ma triode and 8.2ma pentode)
