(!!!!) (Best Pair) 6U8A GE NOS 1960's
(!!!!) (Best Pair) 6U8A Philips by Sylvania NOS 1986 (17.3/17.6ma and 9.5/9ma)
(!!!!) (Best Pair) 6U8A Philips by Sylvania NOS 1986 (19/19ma and 9/9.4ma)
(!!!!) (Best Single) GB-1252=6U8A Sylvania Gold Brand NOS 1970 (Premium 6U8A) (18.6/10.2ma)
(!!!!) (Best Sounding Single) ECF82=6U8 Telefunken <> bottom NOS 1964 (19.6ma/10ma)
(!!!!) (Recommended Pair) 6U8A Philips by Sylvania NOS 1986 (16.0/16.0ma and 8.8/9.2ma)
(!!!) (Best Raytheon Single) 6U8A Raytheon USA NOS "O" getter halo 1962 (16.6ma and 9.4ma)
(!!!) (Best Single) 6U8A GE NOS 1975 (20ma/13.6ma) (High Ma and Gm)
(!!!) (Best Single) 6U8A Raytheon USA black plates "O" getter NOS 1960's (20.4ma and 9.5ma)
(!!!) (Recommended Pair) 6U8A GE NOS 1969-1971 (15/11ma and 14/10.2ma)
(!!) (Recommended Single) 6U8A GE NOS 1977 (14.2ma/10ma)
(!!) (Recommended Single) 6U8A Raytheon USA black plates "U" getter NOS 1962 (17.2ma and 8.0ma)
(!) (#1 6U8 Best Value) ECF82=6U8 Telefunken <> bottom NOS 1960's (Pentode 65% and Triode 100%)
(!) (#1 6U8A England single) CV5065=6U8A Thorn AEI England NOS 1966 (10ma and 18.4ma)
(!) ECF82=6U8 Telefunken <> bottom used/good 1967
6678 (see 6U8)
6U8A Raytheon USA NOS Black Plates NOS 1960's
6U8A Rogers Canada NOS 1974 (8ma and 14.8ma)
6U8A used/good
6U8A=6678 Dumont NOS 1971 (18.5/10.2ma)
