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(!!!) 12AX7 Sylvania 1960-1965 used/tests like new small mica flake inside tube (Gm=2400/2800)
(!!) (Best Value Single) 12AX7 EI Yugoslavia Marshall Smooth Plates TELEFUNKEN copy NOS 1970's (0.7/0.6ma and Gm=1400/1300)
(!!) (Best Value Single) 12AX7=ECC83 Mullard UK used/good 1965 (163 series) (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)
(!!) 12AX7 Sylvania branded Philco NOS 1965 (Gm=2400/2400 and 1.6/1.5ma) 1-3% section balance
(!) (GOOD VALUE USED) 12AX7 GE gray pinched plates used/good 1960's "O" getter halo (Gm=1400/1300 and 0.8/0.7mA)
(!) (GOOD VALUE USED) 12AX7 GE gray pinched plates used/good 1960's "O" getter halo (Gm=1500/1400 and 0.8/0.8mA)
