(!!!!!) (2nd Best Raytheon Black Plates Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1800) (1.1/1.3ma)
(!!!!!) (Best 12AX7 Holland Matched Quad) 12AX7=ECC83 Philips Holland NOS 1970-1971 (1.3/1.4ma x 4 tubes) (1-2% matched) (High Ma and Gm)
(!!!!!) (Best Brimar Pair) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's (1.1/1.4ma and 1.1/1.5ma)
(!!!!!) (Best Holland Pair) 12AX7=ECC83 Philips Holland NOS 1970-1971 (1.1/1.4ma and 1.2/1.3ma) (1-2% matched)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.2/1.4ma and 1.3/1.5ma) 1-2% matched (P2)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.3/1.3ma and 1.2/1.3ma) 1-2% matched (Highest Ma and Gm)
(!!!!!) (Best Raytheon Black Plates Pair) JRP-12AX7 Raytheon Black Plates NOS 1962 (1.4/1.4ma and 1.4/1.5ma) 1-2% matched (Highest Ma and Gm)
(!!!!!) (Best Raytheon Black Plates Single) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1750/1800) (1.5/1.6ma) (high Ma and Gm) 1-2% section balance
(!!!!!) (Best SIEMENS Matched Quad) 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)
(!!!!!) (~ Best Siemens Pair ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 1% matched (1.0/1.2ma x 2 tubes) (recommended for the best phono stages)
(!!!!!) (~ Best Siemens Pair ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 1-3% matched (1.1/1.3ma and 1.0/1.2ma)
(!!!!!) (~ Recommended Pair ~) ECC83=12AX7 Siemens Halske Germany NOS 1967 (1.1/1.2ma and 1.1/1.2ma) 1% matched
(!!!!) (#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)
(!!!!) (2nd Best Raytheon Black Plate Pair) JRP-12AX7 Raytheon tall-ribbed "Black Plates" NOS 1962 (1.0/1.2ma and 1.0/1.2ma) 1-2% matched (P7)
(!!!!) (Best Value from 1963) ECC83=12AX7 Mullard Electrohome ribbed plates 1963 (161 series) used/good in white box (Gm=1400/1500) (0.8ma/0.8ma) (picture next week)
(!!!!) (Best Value Single) 12AX7=CV4004 BRIMAR BVA England NOS narrow ribbed plates NOS 1960's slightly faded top getter (1.1/1.1ma) (Gm=1600/1600) 1% section balance
(!!!!) (Recommended 12AX7 Holland) 12AX7=ECC83 Miniwatt Dario Holland NOS 1970 (Gm=1700/1800)
