(!!) (Best Value) 12AX7=ECC83 Haltron India (Mullard clone) ribbed plates NOS 1974 (Gm=1600/1700)
(!!) (Good Value) 12AX7 Siemens Halske Germany rebranded "BOGEN" used/good 1960 (161 Series) (Gm=1400/1500 and 0.8/0.9ma)
(!!) (Good Value) 12AX7A/7025 Sylvania branded RCA used/good 1970's (Gm=1600/2800)
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=1600/1700 and
(!!) (Recommended Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=2100/2300 and 1.7/1.9ma)
(!!) (SINGLE) 12AX7=ECC83 Telefunken Germany <> bottom ribbed plates low hours/like new 1962 (Gm=1500/1500) (0.9/8ma)
(!!) (SINGLE) 7025 RCA gray NOS 1970 era (Gm=1450/1600 and 1.0/1.2mA)
(!!) (Single) JAN-12AX7WA Sylvania NOS 1974 (Gm=1800/2500 and 1.5/2.1ma)
(!!) 12AX7 Telefunken Germany ribbed plates used/good 1960's smeared printing (Gm=1300/1700 and 0.9/1.4ma)
(!!) 12AX7A Westinghouse pinched plates "D" getter used/like new early 1960's no printing (Gm=1600/1750)
(!!) 12AX7A Westinghouse pinched plates "square="D" getter" used/good 1950's (Gm=1400/1650)
(!!) 12AX7A/7025 Sylvania branded RCA NOS 1970's (Gm=2100/2000)
(!!) 12AX7WA GE printed 12AX7 B&L used/good 1970's (Gm=12001300) (0.7/0.8ma)
(!) (Best Toshiba Single) 12AX7 Toshiba Lindal Japan NOS 1960's (Gm=1800/1800)
(!) (Good Value) ECC83=12AX7 Siemens Halske Germany used/good 1960's in white box (Gm=1500/1700)
(!) (MULLARD CLONE) 12AX7=ECC83 Matsushita Japan NOS 1960's (Gm=1600/1500 and 1.2/1.0ma) (similar to Mullard)
(!) (MULLARD CLONE) 12AX7=ECC83 Matsushita Japan used/good 1960's (Gm=1450/1250 and 1.3/1.1ma) (similar to Mullard)
(!) 12AX7A GE used/good 1981 (Gm=1150/1350, 0.6/0.8ma)
(!) 12AX7A GE used/good 1981 (Gm=1250/1250, 0.6/0.7ma)
(!) 12AX7A GE used/good 1981 (Gm=1250/1350, 0.6/0.8ma)