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(!!!!) (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 1958) 12AX7 GE tall gray ribbed plates "U" getter 1958 like new (Gm=1800/1800 and 1.3/1.3ma) 1% section balance
(!!!!) (Best Single 1960) 12AX7 GE tall gray ribbed plates "U" getter NOS 1960 (Gm=1700/1600 and 1.5/1.1ma)
(!!!!) (Best Single 1965) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.6/1.2mA and Gm=2000/1700) (Fender, McIntosh) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7 RCA black plates branded Westinghouse "U" getter NOS 1950's (1.1/1.4ma and Gm=1700/1800) (strong mA and Gm)
(!!!!) (Best Single) JAN-6V6G=VT-107A RCA coated glass tests like new mid-1940's (56ma)
(!!!!) (Best Single) JAN-CHS-6V6G=VT-107A Sylvania coated glass tests like new 1944 (42ma)
(!!!!) (Best Value Pair #1) 12AX7A RCA gray ribbed plates NOS 1967-1973 (best tone) (0.9/0.9ma and 0.9/1.1ma) (Fender)
(!!!!) (Best Value Pair) 6V6GT GE coated glass NOS 1952 same date codes (56ma and 59ma)
(!!!!) (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 Westinghouse gray pinched plates "D" getter like new 1960 faded printing (Gm=1600/1700 and 1.3/1.4mA) (same plate structure as 5751)
(!!!!) (Best Value Single) 12AX7 Westinghouse gray pinched plates "D" getter like new 1960 faded printing (Gm=1800/1800 and 1.4/1.3mA) (same plate structure as 5751)
(!!!!) (Best Value Single) ECC83=12AX7 Mullard Webcor ribbed plates used/very good 1962 (161 series) (1.0/0.9ma and Gm=1500/1500) 1-3% section balance
(!!!!) (Best Value used) ECC83=12AX7 Fisher Mullard ribbed plates used/good 1964 (.8/1.2mA Gm=1400/1600)
(!!!!) (Good Value Pair) 6V6GTA RCA used/good 1962 and 1970's (30ma and 31.5ma)
(!!!!) (Good Value Single 1960) 12AX7 GE tall gray ribbed plates "U" getter used/good 1960 (Gm=1600/1450 and 1.1/0.9ma)
(!!!!) (Pair) 5Y3GT Philips Holland NOS 1960's (60-65/40 and 60-66/40)
(!!!!) (recommended Pair) 6V6GT GE coated glass NOS 1951-1954 (42ma and 43.5ma) (similar to RCA)
(!!!!) (Recommended Single) 12AX7 RCA Motorola black plates "D" getter tests like new 1953 (1.1/1.3ma and Gm=1600/1700)
(!!!!) (Recommended Single) 12AX7 RCA Motorola black plates "D" getter tests like new 1954 (1.2/1.4ma and Gm=1700/1800)
