(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (8.4/14ma)
(!) (SINGLE) ECC85=6AQ8 Sylvania black plates NOS 1960's (12.2/9.8ma)
(!!!) (Recommended Pair) 407A Western Electric NOS "O" getter 1972-1983 (40-40/26 and 42-43/26)
(!!!) (Best Pair) 407A Western Electric NOS "O" getter 1979-1983 (46-42/26 and 46-42/26)
(!!!) (Good Value Pair) 12AU7A RCA clear top used/good 1960's (8/10ma and 8/9.5ma)
(!!!) (Recommended Pair) 407A Western Electric used/good 1963-1964 (35-38/26 and 36-38/26)
407A Western Electric used/good 1959 (32/26 and 34/26)
407A Western Electric used/good 1962 (35/26 and 42/26)
(!!!!) (Recommended Pair) 6SN7GTA GE "U" getter halo - side getter - copper grid posts NOS 1951-1953 (7.0/7.8ma and 7.8/7.2ma) (close Gm)
(!!!!) (Best Single) 6SN7GTA GE NOS "U" getter halo - side getter - copper grid posts 1952 (8.8/7.8ma)
(!!!) (Recommended Single) 12AU7A RCA clear top NOS 1969 (8.4/8.2ma)
6SJ7 RCA metal can like new 1964 (3.8ma)
(!!!) (Recommended Single) 6BZ7 RCA black plates "U" getter NOS 1957 (9.0/9.4ma)
(!!!) (Recommended Single) 6BZ7 RCA black plates large "O" getter NOS 1965 (13.0/14.2ma)
(!!!!) (GE Pair) 6BQ7A GE NOS "O" getter halo 1978-1980 (8.4/11.8ma and 9.4/11.0ma) (Schiit, DNA, Modwright)
(!!!!!) (Best Overall Single 1957) 12AX7=ECC83 Mullard UK "long plates" NOS 1957 (1.3/1.3ma) 1% section balance (mC1 series)
(!!!) (Best Single) 12AU7A RCA clear top NOS 1964 (8.4/8.6ma) (same Gm)
(!!) (BEST PAIR) JAN-85 Tungsol NOS 1944 (49/25 and 49/25)
(!!!) (Best Single) 12AX7A Sylvania NOS 1970's (Gm=2800/2900)
6SJ7 GE NOS 1967 (3.2ma)
