(!!!!!) (#1 12AX7 Siemens Single) ECC83=12AX7 Siemens Halske NOS 1967 (Gm=2100/2100) (1.6/1.7ma) (Highest Ma and Gm)
(!!!!!) (#1 ECC803S Telefunken Pair - Superb Pair) ECC803S=12AX7 Telefunken Germany <> bottom gold pins NOS same date codes 1969 1-2% matched (High Ma and Gm) (You can't buy a better pair)
(!!!!!) (BEST HOLLAND QUAD) 12AX7=ECC83 Philips Holland NOS 1971 (1.4/1.5ma and 1.4/1.5ma x 4 tubes) (1-2% matched) (High Ma and Gm)
(!!!!!) (~ Recommended Single ~) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's (1.3/1.5ma) (Gm=1800/1800)
(!!!!!) (~ Recommended ~) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's (1.2/1.4ma)
(!!!!) (#1 12AX7 Holland Pair) 12AX7=ECC83 Philips Holland NOS 1970-1972 (1.2/1.3ma and 1.2/1.4ma) (1-2% matched) (High Ma and Gm)
(!!!!) (#1 12AX7 MULLARD PAIR) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (1.1/1.4ma and 1.1/1.6ma)
(!!!!) (#1 12AX7 MULLARD SINGLE) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (1.1/1.3ma and Gm=1700/1800)
(!!!!) (#1 12AX7WA Pair) JAN-12AX7WA Sylvania NOS 1974-1976 1-3% matched (Gm=1700/1700 and 1700/1800)
(!!!!) (#1 7025) 7025 GE NOS 1960's (Gm=1860/1800 and 1.4/1.4ma) 1% section balance
(!!!!) (#1 CV4004 Mullard Pair) CV4004=12AX7 Mullard NOS 1981 (1.0/1.0ma and 1.0/1.1ma) 1% matched
(!!!!) (#1B 12AX7 Best Holland Pair 1963) 12AX7=ECC83 Philips Miniwatt Holland NOS small "o" getter halo 1963 same date codes (1.0/1.1ma and 1.0/1.2ma)
(!!!!) (#2 12AX7 Holland Pair) 12AX7=ECC83 Philips Holland NOS 1970 (1.1/1.2ma and 1.2/1.2ma) (1-2% matched)
(!!!!) (#2 12AX7 Siemens Single) ECC83=12AX7 Siemens Halske NOS 1967 (Gm=1900/2000)
(!!!!) (#2 12AX7WA Pair) JAN-12AX7WA Sylvania NOS 1974 1-3% matched (Gm=1400/1600 and 1400/1650)
(!!!!) (#2A 12AX7=ECC803S SINGLE) ECC803S=12AX7 Telefunken Ulm Germany <> bottom NOS 1965 1% section balance (Gm=1650/1650) (1.1/1.1ma)
(!!!!) (#3 ECC803S Single) ECC803S=12AX7 Telefunken Ulm Germany <> bottom used/like new condition 1967 reboxed (1.0/1.2ma)
(!!!!) (#3 ECC803S Telefunken from 1966) ECC803S=12AX7 Telefunken Ulm Germany <> bottom gold pins NOS 1966 some gold plating has been buffed off the pins pins are shiney and clean (1.3/1.3ma) 1% section balance
(!!!!) (#4 12AX7 MULLARD SINGLE) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (0.8/1.0ma and Gm=1500/1650)
(!!!!) (BEST SOUND - LOW NOISE) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-2% matched (recommended for the best phono stages) (P2)
