(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Brimar England NOS flying leads 1960's (solder leads into ckt)
(!!!!!) (Recommended Single) CV4035=M8214=12AX7 Mullard England box plates NOS flying leads 1961 (solder leads into ckt)
(!!!) (Best Value) 12AX7A RCA gray ribbed plates "O" getter halo NOS 1965 (1.0/0.8mA and Gm=1600/1400)
(!!!!) (Single) 12AX7 GE tall gray ribbed plates "O" getter halo 1960 era used/good (Gm=1200/1400 and 0.9/1.1ma)
(!!!!) (Best Pair) 12AX7 GE branded 12AX7A International NOS 1977 (1.3/1.3mA and 1.4/1.4ma) (Same Gm) 1-2% matched
(!!!!) (Best Pair) 12AX7 EI Yugoslavia Smooth Plates TELEFUNKEN copy NOS 1981 (1.1/1.1ma and 1.0/1.2ma) 1-5% matched
