(!!!) (Best Single 1965) JHS-12AX7WA Sylvania NOS 1965 (1.3/1.5ma and Gm=1700/1800)
(!!!) (Best tipped top pair) 448A Western Electric tipped top used/tests like new 1965 (35.5ma and 36.4ma) (Matched on Amplitrex)
(!!!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 2-3% matched (10/11.4ma and 10.2/12ma)
(!!!) (Good Value Pair) JHS-5687WA Sylvania used/very good 1960's faded printing (35.4/34.2ma and 37.0/36.5ma)
(!!!) (PAIR) 6C4 GE ribbed plates NOS 1964-1968 (8.8ma and 9.2ma)
(!!!) (Recommended Pair 1963) JG-5751 GE double mica gray plates NOS 1963 (2.0/1.9ma and 1.9/1.8ma) (same Gm)
(!!!) (Recommended Pair) 407A Western Electric used/good 1963-1964 (35-38/26 and 36-38/26)
(!!!) (Recommended Single 1963) JG-5751 GE double mica gray plates NOS 1963 (2.2/2.4ma)
(!!!) (Recommended Single) 5751 GE double mica gray plates NOS 1979 (2.4/2.5ma)
(!!!) (Recommended Single) JAN-5751 GE double mica gray plates NOS 1981-1982 (2.3/2.7ma)
(!!!) (Single) 6SN7GTA Westinghouse USA black plates NOS 1950's (7.0/7.6ma)
(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)
(!!!) 12AU7 EICO Holland used/good 1961 (8.0/9.6ma)
(!!) (Best Pair 1981) 412A Western Electric NOS "O" getter halo 1981 (53-53/40 x 2 tubes)
(!!) (Best Pair) 412A Western Electric NOS "D" getter halo 1959 (51-52/40 x 2 tubes)
(!!) (Best Pair) 412A Western Electric NOS "D" getter halo 1968 (52-52/40 and 52-53/40)
(!!) (Best Value Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 1-3% matched (9.0/9.6ma and 9.0/9.3ma)
(!!) (Good Value) 12AX7A/7025 Sylvania used/good 1970's (Gm=2300/1900)
(!!) (Recommended Single) 6AN8 Sylvania NOS 1960 era (17/14.8ma)
