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(!!!!) (Best Pair #1) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.6/1.5ma and 1.5/1.7ma)
(!!!!) (Best Pair #2) 12AX7A RCA ribbed plates NOS 1965-1968 (1.4/1.0ma and 1.3/1.1ma) (Fender Rogue, McIntosh)
(!!!!) (Best Pair #2) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.2/1.2ma and 1.3/1.3ma) 1-5% matched
(!!!!) (Best Pair #2) ECC83=12AX7 BRIMAR EDISWAN VALVE England gray ribbed plates "o" getter NOS 1960's (1.3/1.5ma and 1.8/1.3ma) (close Gm)
(!!!!) (Best Pair 1960) 12AX7 GE tall gray ribbed plates "U" getter like new 1960 (1.2/1.2ma and 1.3/1.2ma) 1-3% matched
(!!!!) (Best Pair 1960) 12AX7 Philips Miniwatt Holland large "O" halo low hours/tests like new 1960 (1.0/1.3ma and 1.0/1.2ma) 1-3% matched
(!!!!) (Best Pair) CV4004=12AX7 Mullard box plates NOS 1981 (0.9/1.2ma and 0.9/1.1ma)
(!!!!) (Best Single #2) ECC803S=12AX7 Telefunken Qualitex Ulm Germany <> bottom like new 1964 (1.3/1.5ma and Gm=1600/1800)
(!!!!) (Best Single 1956) 12AX7 GE Motorola tall gray ribbed plates "U" getter 1956 like new (Gm=1700/2000 and 1.6/2.1ma)
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 era (Gm=1600/1800 and 1.2/1.5ma)
(!!!!) (Best Single 1963) 12AX7 Philips Holland Hallicrafters low hours/like new 1963 (Gm=1700/1900 and 1.4/1.5ma) 1-3% section balance
(!!!!) (Best Single 1966) 12AX7 Philips Holland NOS 1966 (Gm=1700/2100 and 1.2/1.7ma)
(!!!!) (Best Single) 12AX7 Brimar BVA England narrow tall ribbed plates NOS 1958 large "O" getter halo (1.4/1.4ma and Gm=2000/1600)
(!!!!) (Best Single) 12AX7A Sylvania red print NOS 1960's (Gm=3000/3500 and 2.5/2.9ma)
(!!!!) (Best Value Pair) 12AX7A RCA gray ribbed plates NOS 1968-1974 (best tone) (0.8/0.9ma and 0.8/1.0ma) (Fender, Rogue, McIntosh, CJ)
(!!!!) (Best Value Single 1960) 12AX7 GE tall gray ribbed plates "U" getter tests like new 1960 faded printing (Gm=1600/1600 and 1.1/1.3ma)
(!!!!) (Best Value Single) 12AX7 Telefunken Germany smooth plates low hours/tests like new 1965 some stains on glass (Gm=1600/1700 and 1.2/1.3ma)
(!!!!) (Best Value Single) ECC83=12AX7 Telefunken Germany <> bottom ribbed plates branded GAP/R Computor tube used/good 1956 (Gm=1400/1500 and 0.8/0.9ma) 1-5% section balance
(!!!!) (Good Value 1962) M8137=12AX7S Philips SQ France ribbed plates NOS 1962 (0.8/0.9ma and Gm=1350/1350) (Special Quality 12AX7)
