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The best sounding audio tubes money can buy (new items listed daily)
(!!!!) (Best Single 1957) ECC83=12AX7 Mullard UK long plates "D" getter NOS 1957 (mC1 series) (1.1/1.3ma) (rare)
(!!!!) (Single 1955 era) CV492=12AX7 BRIMAR England NOS black ribbed plates "D" getter 1955 era (1.1/1.0ma) (Gm=1800/1700) (rare)
(!!!!) (Best Single #1) JRP-12AX7 Raytheon Black Plates NOS 1962 (Gm=1700/1800) (1.5/1.6ma) (Highest mA and Gm)
(!!!!) (3rd Best Pair 1960) 12AX7 Westinghouse NOS gray pinched plates "D" getter 1960 faded printing (1.0/1.0ma and 1.2/0.9ma) 1-5% matched
(!!!!) (Best Pair #1) 12AX7 GE branded 12AX7A International NOS 1977 (1.3/1.3mA and 1.4/1.4ma) (Same Gm) 1-2% matched
(!!!!) (Best Value Pair #1) 12AX7=ECC83 Telefunken Germany <> bottom branded GAP/R Computor tube <> bottom smooth plates used/good 1964 era (0.9/0.8ma and 1.0/0.8ma)
(!!!!) (Single) E83CC=12AX7 Siemens Halske Germany NOS 1976 (0.7/0.9ma and Gm=1400/1600)
(!!!!) (Best Value Pair) 12AX7=ECC83 Telefunken Germany <> bottom smooth plates used/good 1960's (0.8/0.8ma and 0.8/1.0ma)
(!!!!) (Best Pair #1) ECC83=12AX7 Tungsram Hungary branded IEC Mullard NOS 1982 (1.3/1.6ma and 1.4/1.6ma) 1-3% matched (high Gm)
(!!!!!) (Recommended Single) ECC83=12AX7A Tungsram Hungary branded RCA NOS 1970's (Gm=1700/1900) (1.0/1.4ma)
(!!!!!) (Best Pair #2) 12AX7=ECC83 Philips Holland NOS 1966 and 1971 (1.8/1.7ma and 1.6/1.8ma) (Highest mA and Gm)
(!!!!) (Best Single) 12AX7 RCA black plates branded Westinghouse "U" getter NOS 1950's (1.1/1.4ma and Gm=1700/1800) (strong mA and Gm)
(!!!!) (Best Single 1961) 12AX7=ECC83 Philips Miniwatt Holland 1961 large "O" getter halo NOS (1.8/1.3ma and Gm=2100/1700)
(!!!!) (Recommended Pair) 12AX7 Philips and Valvo Holland NOS 1965-1966 era (1.2/1.1ma and 1.3/1.2ma)
(!!!!!) (Best Pair/Best Price) 12AX7=ECC83 Philips Holland NOS 1966 (1.0/1.1ma and 1.0/1.2ma) 1-3% matched
(!!!) (Recommended Single) 12AX7 Amperex Holland "Long Plates" with "D" getter used/tests like new good 1958 faded printing (Gm=1700/1600 and 1.4/1.2ma)
(!!!!!) (Best Overall Pair) 12AX7=ECC83 Philips Holland NOS 1966 same date codes (1.6/1.7ma and 1.5/1.5ma) 1-3% matched (Highest Ma and Gm)
(!!!!) (Best Single 1960) 12AX7 Amperex Bugle Boy Holland like new 1960 (Gm=1700/1800 and 1.1/1.3ma) 1-5% section balance
(!!!!) (Single 1955) 12AX7 BRIMAR England shiney black ribbed plates "D" getter 1955 (1.3/1.0ma) (Gm=1800/1700) (rare)
(!!) (Best Value Single) 12AX7 EI Yugoslavia Smooth Plates TELEFUNKEN copy branded Philips NOS 1968 (1.5/1.5ma and Gm=1700/1700) 1% section balance
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