(!!!!) (Best Siemens Single 1972) E83CC=12AX7 Siemens Halske NOS triple mica made 1972 printed 1976 (1.2/1.2ma) (Gm=1700/1700) 1% section balance
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1966 (53/40 and 54/40)
(!!!!) (Best Single) CV378=GZ37 Mullard UK NOS 1967 (50/40 and 50/40) 1% section balance
(!!!!) (Best Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=1900/1700 and 1.5/1.2ma)
(!!!!) (Best Value 1965) 12AX7 Philips Miniwatt Holland like new 1965 (Gm=2000/2000 and 1.6/1.7ma) (Highest mA and Gm)
(!!!!) (Best Value Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new (2.1/2.0ma and 2.1/2.1ma) 1-2% matched (Same Gm)
(!!!!) (Best Value Single) 6550 Tungsol branded Sylvania smooth gray plate used/tests like new 1960 era (138ma)
(!!!!) (Best Value Single) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/good (2.0/2.1ma)
(!!!!) (Recomended Single) 336A Western Electric NOS 1967 (34ma)
(!!!!) (Recommended Pair) 5751 RCA black plates low hours/test like new 1961-1962 (2.5/2.5ma and 2.7/2.4ma) (Best Audio Grade 5751) (same Gm)
(!!!!) (Recommended Pair) CK-6072 Raytheon triple mica black plates "O" getter halo 1962 used/test like new (2.4/2.8ma and 2.5/2.6ma) 1-3% matched (same Gm)
(!!!!) (Recommended Single) 5751 RCA Hewlett Packard black plates NOS 1968 (2.2/2.0ma)
(!!!!) (Recommended Single) 5751 RCA Hewlett Packard black plates NOS 1968 (2.4/2.6ma)
(!!!!) (Recommended Single) CV378=GZ37 Mullard UK NOS 1967 (52/40 and 54/40) 1-3% section balance
(!!!!) (Recommended Single) GZ37 Mullard UK NOS 1967 (50/40 and 50/40)
(!!!!) (Single) E83CC=12AX7 Siemens Halske Germany NOS 1976 (0.7/0.9ma and Gm=1400/1600)
(!!!) (#1 374A) 374A Western Electric black plate used/test like new 1960's (21-25ma) (11 in stock)
(!!!) (Best Siemens Pair) EL84 Siemens Halske Germany 1966-1969 (40ma and 42.5ma)
(!!!) (BEST SINGLE 1964) AFLC-12AX7WA Sylvania NOS 1964 (Gm=1900/1900)
(!!!) (Best Single) EL84 IEC Mullard NOS "D" getter made in Wien, Austria 1958 (47ma) (same sound as Philips Holland)
