(!!!!!) (2nd Best Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.3/1.4ma) (f91 series)
(!!!!!) (Best Mullard Pair) 12AX7=ECC83 Mullard UK ribbed plates NOS 1970-1974 (1.2/1.3ma and 1.2/1.1ma) (same Gm)
(!!!!!) (Best Overall Pair) 403B Western Electric NOS "D" getter 1969 (9.6/10.2ma) (same Gm)
(!!!!!) (Best Overall Single 1957) 12AX7=ECC83 Mullard UK "long plates" NOS 1957 (1.3/1.3ma) 1% section balance (mC1 series)
(!!!!!) (Best Overall Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.2/1.2ma) 1% section balance
(!!!!!) (Nice Single) ECC82=12AU7 Telefunken Germany <> bottom ribbed plates used/good 1957 (8.5/8.2ma)
(!!!!!) (Recommended Pair) 12AU7A RCA clear tops NOS 1960 (13/10ma and 11/11.5ma)
(!!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 and 1968 (91ma and 96ma) (these are some of the best sounding 6B4G ever made)
(!!!!) (Best Holland Single) 12AX7A=ECC83 Amperex Globe Logo Holland ribbed plates NOS 1970 (1.4/1.4ma and Gm=1700/1800) 1-2% section balance
(!!!!) (Best Pair 1963) JG-5751 GE double mica gray plates NOS 1963 (2.0/2.2ma and 2.0/2.1ma)
(!!!!) (Best Pair) 5V4GA GE NOS (60-60/40 and 60-60/40)
(!!!!) (Best Pair) 5V4GA GE NOS (60-60/40 and 60-62/40)
(!!!!) (Best Pair) JAN-6189=12AU7WA Sylvania NOS 1972-1973 (9.3/10.4ma and 9.6/10.6ma) 1-3% matched
(!!!!) (Best RCA Pair) 5V4GA RCA gray plates NOS 1968-1972 (58-58/40 and 59-59/40)
(!!!!) (Best Single 1961) 12AX7=ECC83 Mullard UK ribbed plates NOS 1961 (161 Series) (1.1/1.1ma and Gm=1600/1700)
(!!!!) (Best Value XF2 Pair) EL34 Mullard XF2 NOS (1) double halo "O-O" (1) single halo "O" 1966 and 1970 (75ma and 78ma)
(!!!!) (Good Single) E88CC=6922 Philips SQ Holland used/tests like new 1968 (13.0/12.6ma) (3D MIDS, low noise) (same Gm)
(!!!!) (Good Value Single) 6SN7GTB Westinghouse USA black plates "D" getter halo like new 1960 (6.8/7ma)
(!!!!) (Good Value) JG-12AY7 GE box plates like new 1953 (3.3/2.5ma)
(!!!!) (Recommended Pair) 403B Western Electric NOS "D" getter 1969 (5.6/5.6ma) 1% matched
