(!!!!!) (~ BEST 12AX7 SIEMENS QUAD IN STOCK ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 matched quad 1-2% matched (recommended for the best phono stages)
(!!!!!) (~ Best MULLARD Pair ~) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (1.0/1.4ma and 1.0/1.2ma) closely matched
(!!!!!) (~ Best MULLARD Pair ~) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (1.2/1.9ma and 1.3/1.9ma)
(!!!!!) (~ Recommended Siemens Pair 1967 ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-2% matched (1.0/1.2ma and 1.0/1.2ma) (recommended for the best phono stages)
(!!!!!) (~ Recommended Siemens Pair 1967 ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-3% matched (1.6/2.0ma and 1.4/2.0ma) (highest Ma and Gm)
(!!!!!) (~ Recommended Siemens Pair 1967 ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-5% matched (1.2/1.5ma and 1.4/1.6ma) (recommended for the best phono stages)
(!!!!!) (~ Recommended Single ~) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's (1.1/1.4ma) (Gm=1600/1800)
(!!!!!) (~ Recommended Single ~) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's (1.1/1.5ma) (Gm=1600/1750)
(!!!!) (#1 12AX7 Holland Pair) 12AX7=ECC83 Philips Holland NOS 1970-1971 (1.1/1.3ma and 1.1/1.3ma) (1-2% matched)
(!!!!) (#1 12AX7 Holland Pair) 12AX7=ECC83 Philips Holland NOS 1971-1972 (1.4/1.4ma and 1.4/1.5ma) (1-5% matched) (High Ma and Gm)
(!!!!) (#1 CV4004 Mullard Pair) CV4004=12AX7 Mullard NOS 1981 (1.0/1.0ma and 1.0/1.1ma) 1% matched
(!!!!) (#4 12AX7 MULLARD SINGLE) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (0.8/1.0ma and Gm=1500/1650)
(!!!!) (~ Best 12AX7 Brimar Pair ~) 12AX7=CV4004 BRIMAR England tall narrow ribbed plates NOS 1960's (1.3/1.3ma and 1.2/1.4ma) 1-2% matched
(!!!!) (~ BEST 12AX7 MULLARD SINGLE ~) 12AX7=ECC83 Mullard England ribbed plates NOS 1969 (163 Series) (1.2/1.8ma and Gm=1700/1900)
(!!!!) (~ BEST 12AX7 MULLARD SINGLE ~) 12AX7=ECC83 Mullard England ribbed plates NOS 1974 (163 Series) (1.1/1.5ma and Gm=1700/1900)
(!!!!) (~ Best 12AX7 Telefunken Single ~) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates NOS 1962 (Gm=1700/1700)
(!!!!) (~ BEST ECC803S Single ~) ECC803S=12AX7 Telefunken Ulm Germany <> bottom NOS 1965 1% section balance (Gm=1650/1650) (1.1/1.1ma)
(!!!!) (~ Best Holland Pair 1963 ~) 12AX7=ECC83 Philips Miniwatt Holland NOS small "o" getter halo 1963 same date codes (1.1/1.1ma and 1.1/1.2ma)
(!!!!) (~ BEST RAYTHEON BLACK PLATES QUAD ~) 12AX7 Raytheon Ribbed Black Plates NOS 1962 (Q1) closely matched
(!!!!) (~ Recommended 12AX7 Holland ~) 12AX7=ECC83 Miniwatt Dario Holland NOS 1970 (Gm=1700/1800)
