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(!!!) (Best Value Single) 12AX7=ECC83 SIEMENS HALSKE GERMANY used/good 1966 (0.8/0.9ma)
(!!) (Best Value Single) 12AX7=ECC83 Mullard Bogen UK used/good 1966 (Gm=1300/1300) 1% section balance
(!!!!) (Best Pair #1) 12AX7A Sylvania NOS 1970's (2.3/2.0ma and 2.1/2.3ma)
ECC83=12AX7 East Germany used/good 1970's in white box (1.0/0.7ma)
(!) (Single) 12AX7 GE used/good 1972 (Gm=1300/1400 and 0.8/0.9ma)
(!!!!) (Best Overall Pair) 12AX7A RCA gray ribbed plates NOS 1974 same date codes (best tone) (1.3/1.2ma and 1.3/1.1ma) (Fender, McIntosh, Rogue Audio
(!!!!!) (Recommended Single) M8137=CV4004=12AX7 Mullard branded Philips box plates NOS 1966 (Gm=1500/1400 and 1.0/0.8mA)
(!!) (slightly microphonic) 12AX7 Sylvania Zenith black ribbed plates "D" getter NOS/80% 1953 (Gm=1300/1400 and 0.9/1.0ma)
(!!) (Good Value Single) 12AX7A GE NOS 1976 (0.9/1.3mA and Gm=1400/1800)
(!!) (Good Value Single) ECC82=12AU7 Philips Miniwatt Holland used/good 1965 (7.8/10ma)
(!!) (#1 12AT7 France) 12AT7 Philips Miniwatt France NOS 1964 in white box (7.4/7.8ma)
(!!!!!) (Best Pair) EF86 Amperex Bugle Boy Holland NOS 1966 (3.3ma and 3.0ma) (close Gm)
(!!!) (Best Value Single) ECC85=6AQ8 Philips Holland NOS 1975 (10/17ma)
(!!!!) (Single) 12AT7 Philips by Mullard UK NOS 1965 (14.3/8.5ma)
(!) ECC82=12AU7 Valvo Holland used/good 75-90% 1968 (7.8/9.0ma)
(!!!!) (Best Pair #2) 12AX7A RCA ribbed plates NOS 1965-1968 (1.4/1.0ma and 1.3/1.1ma) (Fender Rogue, McIntosh)
(!!!) (Best Value #2) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1967 (0.9/1.1mA and Gm=1300/1500)
(!!!) (Best Single #2) 12AX7A Sylvania NOS 1970's (Gm=2700/3200 and 1.7/2.3ma)
(!!!!) (Single) E83CC=12AX7 Siemens Halske Germany NOS 1976 (0.7/0.9ma and Gm=1400/1600)
(!!!) (Good Value Single) 12AU7 EICO Holland used/good 1961 (8.0/9.6ma)
