(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Miniwatt Holland like new "O" getter halo 1961 (1.4/1.6ma and 1.4/1.5ma) (Highest mA and Gm) 1-2% matched
(!!!!!) (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 Single) ECC83=12AX7 Telefunken Germany smooth plates NOS 1965 (1.3/1.5ma and Gm=1800/2000) (Highest mA and Gm)
(!!!!!) (Recommended Pair) JAN-CTL6SL7WGT Tungsol NOS brown base gray ribbed plates 1961-1965 (2.1/2.2ma and 2.1/2.3ma) (low noise - very smooth sound) (phono grade)
(!!!!) (Best 6922 Single) USN-CEP-6922 Amperex USA NOS 1964 pins #7-#8 gently cleaned of oxidation (18.5ma/20.2ma) (Best American Made 6922)
(!!!!) (Best Overall Single) ECC802S=12AU7 Telefunken Germany <> bottom NOS 1970 (10.2/11.2ma)
(!!!!) (Best Overall Single) GB-5963=12AU7 Sylvania Gold Brand Gold Pins NOS 1960's (11.2/13.6ma)
(!!!!) (Best Overall Single) GZ37 Mullard UK NOS 1966 (52/40 and 52/40) 1% 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) 102F Western Electric NOS 1967 large getters (1.0ma and 1.1ma) (High Ma and Gm)
(!!!!) (BEST PAIR) 5R4GYB RCA and RCA branded Westinghouse NOS 1961-1970 (50-52/40 and 50-53/40)
(!!!!) (Best Pair) ECC84=6CW7 Ultron East Germany by RFT 1970's 1-2% matched (10.2/10.4ma and 10.2/10.6ma)
(!!!!) (Best Pair) ECL86=6GW8 Philips Holland NOS 1968 (1.1/1.2ma and 40.5/44ma)
(!!!!) (Best Pair) ECL86=6GW8 Siemens Germany NOS 1968-1969 (1.1/1.2ma and 41/46ma)
(!!!!) (Best Single) 12AU7=ECC82 Mullard UK ribbed plates NOS 1972 (12.2/13.6ma) (same Gm) (smooth rich sound)
(!!!!) (Best Single) 12BH7A Tungsol black plates "O" getter halo 1960 era (11.0/11.6ma)
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1966 (53/40 and 54/40)
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1967 (50/40 and 50/40) 1% section balance
(!!!!) (Best Value Pair) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates used/good 1960's (0.8/0.8ma and 0.8/1.0ma)
(!!!!) (Best Value Single) 12AU7=ECC82 Mullard UK ribbed plates like new 1965 (10/12.8ma) (smooth rich sound)
