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(!!) (Best Value Single) 12AX7 EI Yugoslavia Smooth Plates TELEFUNKEN copy branded Philips NOS 1968 (1.5/1.5ma and Gm=1700/1700) 1% section balance
(!!) (Best Value Single) ECC83=12AX7 Tungsram Hungary 1980 era branded Amperex NOS 1985 (1.3/1.6ma and Gm=1800/1800)
(!!) (Good Value Single) 12AX7A GE NOS 1976 (0.9/1.3mA and Gm=1400/1800)
(!!) (Good Value) 12AX7 Siemens Halske Germany rebranded "BOGEN" used/good 1960 (161 Series) (Gm=1400/1500 and 0.8/0.9ma)
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!) 12AX7 GE branded Video black plates D getter 1957 used mis-matched triode sections (1.1ma/0.6ma)
(!!) 12AX7A Westinghouse pinched plates "D" getter used/good 1960 era no printing (Gm=1450/1650)
(!) (Best Value) 7025A=12AX7A China branded International Yugo NOS 1990's (1.0/0.9ma and Gm=1700/1600)
(!) (Good Value) 12AX7WXT Sovtek NOS 1990's (Gm=1500/1400 and 0.9/0.8ma)
(READ REVIEW) (Single 1955) 12AX7 BRIMAR England shiney black ribbed plates "D" getter 1955 (1.3/1.0ma) (Gm=1800/1700) (rare)
12AX7 Telefunken Germany
ECC83=12AX7 East Germany used/good 1970's in white box (1.0/0.7ma)
ECC83=12AX7 Mullard UK BVA long plates "O" getter like new 1958 (f91 series) (1.2/1.2ma)
