(!!!!!) (Best 12AX7 Single) 12AX7 Telefunken Germany <> bottom smooth plates 1960's (1.2/1.3ma and Gm=1600/1700)
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Holland NOS 1970-1971 (1.3/1.4ma x 2 tubes) (1-2% matched) (High Ma and Gm)
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Holland NOS 1971 (1.3/1.4ma x 2 tubes) (1-2% matched) (High Ma and Gm)
(!!!!!) (Best Overall Pair) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-3% matched (1.1/1.3ma and 1.1/1.1ma)
(!!!!!) (Best Overall Single) 5751 Raytheon black plates windmill getter halo NOS 1964 (2.0/2.1ma)
(!!!!!) (Best Overall Single) 5751 Raytheon branded National black plates windmill getter halo NOS 1960's (2.4/2.6ma)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.2/1.4ma and 1.3/1.5ma) 1-2% matched (P2)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.3/1.3ma and 1.2/1.3ma) 1-2% matched (Highest Ma and Gm)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.4/1.4ma and 1.4/1.5ma) 1-2% matched (Highest Ma and Gm)
(!!!!!) (Best Raytheon Black Plates Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1700) (1.3/1.4ma) 1-2% section balance
(!!!!!) (Best Telefunken Single) 12AX7 Telefunken Germany <> bottom smooth plates red-tip mil-grade 1967 (1.1/1.2ma and Gm=1600/1600) 1-2% section balance
(!!!!!) (Good Value Single) 12AX7 Telefunken Germany <> bottom smooth plates 1967 (1.0/1.5ma and Gm=1500/1800)
(!!!!!) (Recommended Black Plate Single) 12AX7 Raytheon Black Plates NOS 1961 (Gm=1600/1700) (0.9ma/1.0ma)
(!!!!!) (Recommended Black Plate Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1800) (1.1/1.3ma)
(!!!!!) (Recommended Bugle Boy 1965) 12AX7=ECC83 Amperex Bugle Boy Holland NOS 1965 (1.4/1.6ma) (High Ma and Gm)
(!!!!!) (Recommended Pair) 12AX7=ECC83 Telefunken Dynaco Germany <> bottom smooth plates used/very good mid-1960's (1.0/1.1ma and 1.0/1.1ma) 1-2% matched
(!!!!!) (Recommended Pair) 12AX7=ECC83 Telefunken Dynaco Germany <> bottom smooth plates used/very good mid-1960's (1.0/1.3ma and 1.1/1.2ma) 1-2% matched
(!!!!) (2nd Best Raytheon Black Plate Pair) JRP-12AX7 Raytheon tall-ribbed "Black Plates" NOS 1962 (1.0/1.2ma and 1.0/1.2ma) 1-2% matched (P7)
(!!!!) (Best Single) ECC803S=12AX7 Telefunken Ulm Germany <> bottom NOS 1965 1% section balance (Gm=1650/1650) (1.1/1.1ma)
(!!!!) (Best Value 12AX7 Mullard) ECC83=12AX7 Mullard Electrohome ribbed plates 1963 (161 series) used/good in white box (Gm=1400/1500) (0.8ma/0.8ma)
