(!!) (Recommended Pair) 12AT7 RCA gray plates NOS 1960's (9.4/10.5ma and 9.5/8.7ma)
(!!!) (Best used single) 12AT7 Telefunken Diamond Bottom used/good 1960's (10.0ma/10.8ma)
(!!) (Best Single) 12AU7A Westinghouse gray plates "O" getter halo 1960's NOS (10.6/11.2ma)
(!!) (#1 12AU7 Raytheon from 1954) 12AU7 Raytheon gray ribbed plates "D" getter halo NOS 1954 (10.6/11.2ma)
(!!) (#1 12AU7 Raytheon from 1956) 12AU7 Raytheon gray ribbed plates super large "U" getter halo NOS 1956 (10.4/10.8ma) (High Ma and Gm)
(!!) (#1 12AU7A Raytheon 1960's single) 12AU7A Raytheon Uniline gray ribbed plates "O" getter NOS 1960's (8.2/11ma)
(!!!) (Best Single 1954) JG-12AX7 GE gray ribbed plates "U" getter 1954 used/tests like new (Gm=1500/1600 and 1.1/1.1ma)
(!!!) (Good Value Single) 12AX7=ECC83 Mullard GE UK ribbed plates used/good 1966 (.8/.9ma and Gm=1450/1600)
(!!) (Best Value Single) ECC83=12AX7 Tungsram Hungary 1980 era branded Amperex NOS 1985 (1.3/1.6ma and Gm=1800/1800)
(!!!!) (Best Tungsram Single) ECC83=12AX7 Tungsram Hungary NOS 1982 (1.6/1.5mA and Gm=2100/2000) (high Ma and Gm)
(!!!) (Best Single) 12AZ7 Tungsol black plates "D" getter halo NOS 1955 (12ma/14ma)
(!!) (#Recommended Single) 12AZ7 Tungsol black plates "U" getter halo NOS mid-1950's (9.0ma/9.2ma) 2% section balance
(!!!) (Best Pair) 244A Western Electric NOS ST-14 "Engraved Base" 1930's - 1940 (4.1ma and 5ma) (close Gm)
(!!) (#1 37 Pair) 37 RCA like new 1940's (7.7ma and 7.8ma) 1% matched
(!!) (#1 37 Pair) 37 RCA NOS 1940's (7.3ma and 7.5ma)
(!!) (#1 37 Pair) 37 RCA NOS 1940's (8.5ma and 8.5ma) 1% matched
(!!) 5654=6AK5 RCA Command Series black plate NOS 1968 (8.0ma)
(!!!) (Best Single) CK5687WA Raytheon black plates "O" getter like new 1960 (35/38ma)
(!!) (SINGLE) 5687 Tungsol rebranded IBM bronze plates "U" getter used/very good late 1950's (32.5/39ma)
(!!) (Best Value Single 1961) 5687WA Tungsol bronze plates "O" getter halo used/very good 1961 (33.4/34.8ma)
