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(!!!!!) (Best Value Single) 12AX7 Amperex Bugle Boy Holland red-tip used/good 1966 (0.8/1.6mA and Gm=1400/1800) (red tip mil-grade)
(!!!!) (Best Single 1958) CV455=ECC81=12AT7 Mullard UK "D" getter NOS 1958 (8.7/8.8ma) 1-2% section balance (Same Gm)(reverb, phase inverter)
(!!!!) (Best Single 1960) 12AX7 Amperex Bugle Boy Holland like new 1960 (Gm=1700/1800 and 1.1/1.3ma) 1-5% section balance
(!!!!) (Best Single 1961) 12AX7 Amperex Bugle Boy Holland low hours/like new 1961 (Gm=1500/1500 and 0.9/1.0ma) 1-3% section balance
(!!!!) (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 Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=1900/1700 and 1.5/1.2ma)
(!!!!) (Recommended Pair) 12BH7A RCA gray ribbed plates NOS 1969 (14/9ma and 13/9.5ma)
(!!!!) 12BH7A Westinghouse gray ribbed plates used/good "U" getter 1960 era (8.4/11ma)
(!!!) (Best Pair 1961) ECC82=12AU7 Miniwatt Holland NOS and like new 1961-1963 (9.8/9.2ma and 9.4/9.8ma)
(!!!) (Best Single 1967) ECC82=12AU7 Philips Holland NOS 1967 (11.2/10.6ma) (same Gm)
(!!!) (Best Single) 12AT7 Brimar UK branded Knight by Mullard black plates "O" getter NOS 1966 (9.2/10.2ma)
(!!!) (Best Value #2) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1973 (1.0/0.9mA and Gm=1400/1550)
(!!!) (Best Value Single) 12AX7 Baldwin Sylvania "D" getter used/tests like new 1959 (2.1/2.0ma) (Highest mA and Gm) 1-2% section balance
(!!!) (Best Value Single) 12AX7=ECC83 FISHER HOLLAND large "O" getter halo 1960 used/good (Gm=1550/1600 and .9/1.0ma)
(!!!) (Best Value Single) 12AX7=ECC83 FISHER HOLLAND large "O" getter halo 1961 used/good (Gm=1500/1600 and .9/.9ma)
(!!!) (Best Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.0/0.8mA and Gm=1600/1400)
(!!!) (Recommended Pair) 12AX7 Baldwin Sylvania "D" getter used/very good 1959 (1.7/1.8ma and 1.9/1.6ma)
(!!!) (Recommended Pair) JAN-6922 Sylvania NOS 1971-1979 (17.6/18.3ma and 15.0/18.4ma) (smooth presentation)
(!!!) (SINGLE) 12BH7A Brimar UK rebranded GE short ribbed black plates 1967 (8.0/9.2ma)
(!!!) (SINGLE) 12BH7A Brimar UK rebranded GE short ribbed black plates 1968 (11/10.2ma)
