(!!!!!) (Best Value Single) 12AX7 IEC Mullard UK NOS 1965 copper grid posts (0.7/1.2ma and Gm=1400/1700)
(!!!!!) (Best Value Single) 12AX7 Mullard branded "M" UK used/good 1961 copper grid posts (0.7/.8ma and Gm=1400/1500) (161 series)
(!!!!) (Best Value Single) 12AX7=ECC83=7025 IEC Mullard ribbed plates used/good 1965 (1.0/1.2ma and Gm=1600/1800)
(!!) 7025 RCA gray plates used/good 1960's - 1970 (.9/.9mA and Gm=1400/1500)
(!) 12AX7A RCA used/good 1960's (Gm=1300/1500)
