(!!!!!) (Best Single 1958) 12AX7=ECC83 Mullard UK "long plates" NOS 1958 (1.3/1.4ma)
(!!!!!) (Best Single 1965) 12AX7 Mullard Bell & Howell UK NOS 1965 (1.3/1.2ma and Gm=1700/1600)
(!!!!!) (Best Value Single) 12AX7=ECC83 Mullard UK like new 1973 (1.8/1.1mA and Gm=2000/1600)
(!!!!!) (Recommended Pair) 12AX7=ECC83 Mullard UK ribbed plates NOS 1970-1974 (1.2/1.3ma and 1.2/1.1ma) (same Gm)
(!!!!!) (Recommended Pair) 6C4C=6B4G Russian NOS 1955 and 1968 (91ma and 96ma) (these are some of the best sounding 6B4G ever made)
(!!!!!) (Recommended Pair) EL34 Philips Mullard XF2 single halo "O" NOS and like new 1969-1973 (90.8ma and 95ma) (can make a quad with another XF2 pair)
(!!!!) (Best Pair 1963) JG-5751 GE double mica gray plates NOS 1963 (2.0/2.2ma and 2.0/2.1ma)
(!!!!) (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 Pair) 6BQ5 Sylvania used/good 1970 era (41ma and 46ma)
(!!!!) (Best Value Pair) 6SN7GTB GE NOS 1970 era (7.1/6.8ma and 7.2/7.2ma) (Schiit Freya)
(!!!!) (Best Value XF2 Pair) EL34 Mullard XF2 NOS (1) double halo "O-O" (1) single halo "O" 1966 and 1970 (75ma and 78ma)
(!!!!) (Recommended Pair) 403B Western Electric NOS "D" getter 1969 (5.1/5.1ma)
(!!!!) (Recommended Pair) 403B Western Electric NOS "D" getter 1969 (5.6/5.6ma) 1% matched
(!!!!) (Recommended Pair) 403B=6AK5 Western Electric NOS "D" getter 1969 (7.3/7.0ma)
(!!!!) (Recommended Pair) 403B=6AK5 Western Electric NOS "D" getter 1969 (9.3/8.7ma) (same Gm)
(!!!!) (Recommended Pair) 6V6GTA GE NOS 1960's - 1970 (38ma and 40ma) (Fender, Two Rock, Victoria)
(!!!!) (Recommended Pair) JAN-6189W=12AU7WA Sylvania NOS 1972-1973 (9.6/10.6ma and 9.3/10.4ma) 1-3% matched
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (4.8, 4.9, 5.1, 5.2ma)
(!!!!) (Recommended Quad) 403B=6AK5 Western Electric NOS "D" getter 1969 matched set of 4 (6.3, 6.3, 6.4, 6.5ma)
